Process cartridge

Abstract

Disclosed in the present invention is a process cartridge, which is detachably mounted in a main assembly of an image forming device, the main assembly being provided with a separation control component. The process cartridge comprises a drum unit, a developing unit and a force-receiving member, wherein the drum unit comprises a photosensitive drum; the developing unit comprises a developing roller; the developing unit is movable relative to the drum unit between a developing position and a spaced position; the force-receiving member is located on one side of the developing unit, and the force-receiving member is provided with a separation force-receiving surface and a separation abutting surface intersecting with the separation force-receiving surface; the separation force-receiving surface can receive an acting force from the separation control component to drive the developing unit to move from the developing position to the spaced position; and the separation abutting surface can abut against the separation control component to keep the developing unit at the spaced position. In the present solution, the separation force-receiving surface for receiving a separation force and the separation abutting surface for maintaining a separated state are integrated on a single force-receiving member, thereby simplifying the structure of the process cartridge, reducing the number of parts and saving costs.

Description

A process cartridge TECHNICAL FIELD

[0001] The present application relates to the technical field of image forming, and particularly relates to a process cartridge. BACKGROUND

[0002] An image forming apparatus using an electrophotographic image forming process includes a process cartridge that forms an image by a contact developing method. The contact developing method of the process cartridge forms an image by performing a developing process in a state in which a developing unit (developing roller) is in contact with a drum unit (photosensitive drum). In such a process cartridge, the developing roller is pushed toward the photosensitive drum with a predetermined pressure during the developing process, and is in contact with the surface of the photosensitive drum with the predetermined pressure.

[0003] In the case of using a developing roller that includes an elastic layer on the surface, for example, the following can be considered. That is, if a period in which the elastic layer is not formed in contact with the surface of the photosensitive drum (the developing roller is not rotated) is long, the elastic layer of the developing roller can be deformed by being in contact with the surface of the photosensitive drum. Thereby, an image defect such as an unintended unevenness of a developer image can occur when the developing process is performed.

[0004] Further, as another example, when the developing roller is in contact with the photosensitive drum during a period in which the developing process is not performed, the developer carried on the developing roller is unnecessarily deposited to the photosensitive drum, and such a developer is deposited on a recording material, as a result of which contamination of the recording material occurs. Such a problem can occur regardless of whether or not the elastic layer is provided on the surface of the developing roller.

[0005] Further, as another example, when the photosensitive drum and the developing roller are in contact with each other for a long time other than a period in which the developing process is performed, the photosensitive drum and the developing roller rub each other for a long time, which can accelerate deterioration of the developing roller or the developer. Such a problem can occur regardless of whether or not the elastic layer is on the surface of the developing roller.

[0006] Therefore, it is necessary to provide the process cartridge in a state in which the photosensitive drum and the developing roller are separated from each other when not in operation, and in the prior art, the process cartridge is generally separately provided with a separation force receiving member, a separation holding member, and the like, and the structure is complicated, the number of parts is large, and the precision, the material strength, and the fitting tolerance of each part are required to be high. SUMMARY

[0007] The present application provides a process cartridge for being detachably installed in a main assembly of an image forming apparatus, the main assembly being provided with a separation control member, the process cartridge comprising a drum unit, a developing unit, a developing coupling, and a force receiving member;

[0008] The drum unit comprises a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction;

[0009] The developing unit includes a developing frame and a developing roller rotatably provided on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in the second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum;

[0010] The developing coupling is arranged in the developing unit for receiving the rotational driving force and transmitting the rotational driving force to the developing roller;

[0011] The force receiving member is located at one side of the developing unit, the force receiving member is provided with a separation force receiving surface and a separation abutting surface intersecting with the separation force receiving surface;

[0012] The separation force receiving surface is capable of receiving the acting force of the separation control component to drive the developing unit to move from the developing position to the spaced position;

[0013] The separation abutting surface is capable of abutting with the separation control component to keep the developing unit in the spaced position.

[0014] According to an aspect of the present application, another kind of process cartridge is provided, including a drum unit, a developing unit and a force receiving member;

[0015] The drum unit includes a drum frame and a photosensitive drum rotatably provided on the drum frame, an axis of the photosensitive drum extending in the first direction;

[0016] The developing unit includes a developing frame and a developing roller rotatably provided on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in the second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum;

[0017] The force receiving member is located at one side of the developing unit, the force receiving member is provided with a separation force receiving surface and a separation abutting surface intersecting with the separation force receiving surface;

[0018] In some embodiments, the separation force receiving surface is arranged towards the drum unit, and the separation abutting surface is arranged towards a side of the process cartridge in the first direction.

[0019] In some embodiments, the separation force receiving surface is a vertical surface parallel to the first direction; or, the separation force receiving surface is an inclined surface inclined relative to the first direction.

[0020] In some embodiments, the separation abutment surface is a side plane perpendicular to the first direction; or, the separation abutment surface is a side surface concaved inwardly in the first direction; or, the separation abutment surface is a rough plane.

[0021] In some embodiments, the separation abutment surface is towards a driving end of the process cartridge in the first direction.

[0022] In some embodiments, the separation force receiving surface is towards the drum unit in the second direction, and the separation abutment surface is on a side of the separation force receiving surface away from the drum unit in the second direction.

[0023] In some embodiments, an angle between the separation force receiving surface and the separation abutment surface is between 80 degrees and 100 degrees.

[0024] In some embodiments, the separation abutment surface is between an outer surface of a driving side end cover of the process cartridge and at least a portion of the separation force receiving surface in the first direction.

[0025] In some embodiments, the separation force receiving surface is adjacent to the separation abutment surface.

[0026] In some embodiments, the process cartridge is detachably installed in a main assembly of the image forming apparatus, the main assembly is provided with a separation control member, and when the separation abutment surface abuts against the separation control member, an acting force therebetween keeps the developing unit in the spaced position.

[0027] In some embodiments, further comprising a first clamping portion provided on the drum unit and a second clamping portion provided on the developing unit;

[0028] The first clamping portion cooperates with the second clamping portion to axially move the developing unit in the first direction when the developing unit moves between the developing position and the spaced position.

[0029] In some embodiments, further comprising a third elastic member provided on a conductive end of the process cartridge, the third elastic member is configured to provide an acting force on the developing unit in a direction towards the driving end in the first direction.

[0030] In some embodiments, the process cartridge further comprises a first elastic member provided between the developing unit and the drum unit, the first elastic member is configured to provide an acting force on the developing unit to move the developing unit towards the developing position.

[0031] In some embodiments, the first clamping portion comprises a central protrusion and a guide channel surrounding the central protrusion.

[0032] The second clamping part is a convex column structure, which is at least partially embedded in the guide channel and can move in the guide channel.

[0033] In some embodiments, when the separation force receiving surface receives the separation force of the separation control component, the developing unit moves in the direction of the interval position and moves axially in the first direction towards the conductive end under the compression of the third elastic member.

[0034] In some embodiments, after the separation control component does not apply force to the separation force receiving surface, the developing unit moves in the direction of the developing position and moves axially in the first direction towards the driving end under the action of the first elastic member and the third elastic member.

[0035] In some embodiments, the action of the third elastic member causes the separation abutting surface to abut against the separation control component, and the second clamping part abuts against one side of the central protrusion, and the developing unit is kept in the interval position.

[0036] In some embodiments, after the separation control component and the separation abutting surface are disengaged, the action of the third elastic member and the first elastic member causes the developing unit to move axially in the first direction towards the driving end and in the direction of the developing position, and the second clamping part abuts against the other side after passing through the intersection of one side and the other side of the central protrusion.

[0037] In some embodiments, the force receiving member is fixedly arranged on the developing unit.

[0038] In some embodiments, the force receiving member is slidingly arranged on the developing unit, and the force receiving member can slide in the second direction relative to the developing unit.

[0039] In some embodiments, an eleventh elastic member is arranged between the force receiving member and the developing unit, and the eleventh elastic member is configured to have an action force on the force receiving member in the second direction towards the drum unit.

[0040] In some embodiments, a fourth abutting part and a second abutting part are arranged on the developing unit; when the force receiving member abuts against the fourth abutting part, the movement of the force receiving member in the second direction towards the drum unit is limited; and when the force receiving member abuts against the second abutting part, the movement of the force receiving member in the second direction away from the drum unit is limited.

[0041] In some embodiments, a third limiting part is arranged on the force receiving member, and the third limiting part is located at one end of the separation abutting surface away from the drum unit in the second direction.

[0042] In some embodiments, when the separating force receiving surface receives the separating force of the separating control component to move in a direction away from the drum unit to the force receiving member abuts against the second abutting portion, the force receiving member drives the developing unit to move in a direction to the spaced position and moves in a first direction to the electrically conductive end.

[0043] In some embodiments, when the separating force receiving surface is no longer receiving the separating force from the separating control component, the force receiving member moves in a direction to the drum unit under the action of the eleventh elastic member, and when the separating control component abuts against the third limiting portion, the movement of the force receiving member in the direction to the drum unit is limited.

[0044] In some embodiments, a third elastic member provided at the electrically conductive end of the process cartridge applies an action force to the developing unit in a direction to the driving end, so that the separating abutting surface on the force receiving member abuts against the separating control component, and the friction force between the force receiving member and the separating control component drives the separating control component to move in a direction to the drum unit to abut against the fourth abutting portion, and the developing unit is kept in the spaced position under the action of the friction force.

[0045] In some embodiments, when the developing unit moves axially in the first direction, the developing coupling moves with the developing unit relative to the drum frame, or the developing coupling does not move relative to the drum frame.

[0046] In some embodiments, the first clamping portion and the second clamping portion are provided at the electrically conductive end of the process cartridge.

[0047] In some embodiments, the drum unit is provided with a shielding area, the shielding area has an overlapping portion with the separating force receiving surface and the separating abutting surface in the first direction; the shielding area is provided with a first abutting portion extending to the electrically conductive end of the process cartridge in the first direction; when the separating abutting surface abuts against one side of the separating control component in the first direction, the first abutting portion abuts against the other side of the separating control component in the first direction.

[0048] According to an aspect of the present application, another process cartridge is provided for being detachably installed in a main assembly of an image forming apparatus, the main assembly is provided with a separating control component, the process cartridge includes a drum unit, a developing unit, a developing coupling, a force receiving member, a first clamping portion, a second clamping portion and a third elastic member;

[0049] The drum unit includes a drum frame and a photosensitive drum rotatably provided on the drum frame, an axis of the photosensitive drum extends in a first direction;

[0050] The developing unit comprises a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in a first direction; the developing unit is oppositely arranged to the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum;

[0051] The developing coupling is arranged on the developing unit for receiving a rotational driving force and transmitting the rotational driving force to the developing roller;

[0052] The force receiving member is fixedly arranged on the developing unit;

[0053] When the force receiving member receives the separating force of the separating control component to move the developing unit from the developing position to the spaced position, the first clamping portion and the second clamping portion are matched to further move the developing unit in the first direction towards the direction of the conductive end;

[0054] The third elastic member is arranged on the conductive end of the process cartridge for providing a force to the developing unit in the first direction towards the direction of the driving end of the process cartridge.

[0055] In some embodiments, the first clamping portion is arranged on the drum unit and the second clamping portion is arranged on the developing unit.

[0056] In some embodiments, the force receiving member only receives the separating force to move the developing unit to the spaced position.

[0057] In some embodiments, the process cartridge further comprises a first elastic member arranged between the developing unit and the drum unit, the first elastic member is used to provide a force to the developing unit to move the developing unit to the developing position.

[0058] In some embodiments, the first clamping portion is arranged on the drum unit and the second clamping portion is arranged on the developing unit.

[0059] In some embodiments, the force receiving member is provided with a second force receiving portion, when the second force receiving portion receives the separating force of the separating control component, the developing unit moves to the spaced position and moves in the first direction towards the conductive end, the third elastic member is compressed and deformed; when the second force receiving portion is out of contact with the separating control component and no longer receives the separating force, the third elastic member is deformed to recover, the developing unit moves in the first direction towards the driving end, the second clamping portion abuts against the first positioning portion to keep the developing unit in the spaced position.

[0060] In some embodiments, the force receiving member is provided with a first force receiving portion; when the first force receiving portion receives the contact force of the separation control component, the developing unit moves to a developing position and moves to the conductive end in the first direction, the third elastic member is compressed and deformed, when the first force receiving portion is no longer in contact with the separation control component and no longer receives the contact force, the third elastic member recovers from the deformation, the developing unit moves to the driving end in the first direction, the second clamping portion abuts against the second positioning portion, and the developing unit is kept in the developing position.

[0061] In some embodiments, the first force receiving portion is a surface of the force receiving member on a side away from the drum unit in the second direction, and the second force receiving portion is a surface of the force receiving member on a side toward the drum unit in the second direction.

[0062] In some embodiments, the drum unit comprises a driving side end cover, the driving side end cover is provided with a first rotation hole, and the first clamping portion is arranged on an inner wall of the first rotation hole.

[0063] The developing unit comprises a developing cover, the developing cover is provided with a cylindrical portion matched with the first rotation hole, the cylindrical portion is arranged in the first rotation hole, and the second clamping portion is arranged on an outer wall of the cylindrical portion.

[0064] The first clamping portion is a groove extending obliquely relative to the first direction, the second clamping portion is a protrusion extending obliquely relative to the first direction, and the second clamping portion is embedded in the first clamping portion.

[0065] In some embodiments, the first clamping portion comprises a first guide surface and a second guide surface arranged opposite in a circumferential direction.

[0066] The second clamping portion comprises a first guided surface and a second guided surface.

[0067] In some embodiments, when the force receiving member receives the separation force of the separation control component, the developing unit moves to a spaced position and moves to the conductive end in the first direction, the third elastic member is compressed and deformed, the first guided surface abuts against the first guide surface and slides relative to the first guide surface; when the separation control component moves to a limit position, the third elastic member recovers from the deformation, the developing unit moves to the driving end, the force receiving member abuts against the separation control component, the friction between the force receiving member and the separation control component causes the force receiving member to be kept in the position abutting against the separation control component, the second guided surface abuts against the second guide surface, and the developing unit is kept in the spaced position.

[0068] In some embodiments, when the separation control component is disengaged from the force receiving member, the third elastic member is deformed to restore the developing unit to move towards the driving end and to the developing position, and the second clamping portion moves from the position where the second guided surface is in abutment with the second guide surface to the position where the first guided surface is in abutment with the first guide surface.

[0069] In some embodiments, the first clamping portion includes a central protrusion and a guide channel surrounding the central protrusion.

[0070] The second clamping portion is a protruding column structure, which is at least partially embedded in the guide channel and is movable in the guide channel.

[0071] In some embodiments, the central protrusion includes a fourth side surface inclined relative to the axis of the developing unit, and the second clamping portion is in abutment with the fourth side surface when the developing unit is in the spaced position.

[0072] In some embodiments, the force receiving member includes a separation abutment surface and a separation force receiving surface, the separation force receiving surface is an inclined surface inclined relative to the first direction, and the separation abutment surface is connected to the side of the separation force receiving surface close to the drum unit.

[0073] In some embodiments, when the separation force receiving surface receives the separation force of the separation control component, the developing unit moves in the direction of the spaced position and moves axially in the first direction towards the driving end, and the third elastic member is compressed.

[0074] In some embodiments, after the separation control component does not apply the separation force to the separation force receiving surface, the developing unit moves in the direction of the developing position and moves axially in the first direction towards the driving end under the action of the first elastic member and the third elastic member.

[0075] In some embodiments, the force receiving member includes a first inclined surface and a second inclined surface, the intersection of the first inclined surface and the second inclined surface is a second force receiving portion, and the second force receiving portion is in abutment with the separation control component to receive the action force.

[0076] In some embodiments, the force receiving member includes a protruding portion protruding from the surface of the force receiving member facing the drum unit;

[0077] The first inclined surface and the second inclined surface are arranged on the protruding portion.

[0078] The first inclined surface and the second inclined surface are both inclined and extend in the direction close to the drum unit, and the slopes of the first inclined surface and the second inclined surface are different.

[0079] In some embodiments, the second force receiving portion moves along a surface in contact with the separation control member when the separation force received by the second force receiving portion moves the developing unit from the developing position to the spaced position.

[0080] In some embodiments, the force receiving member exerts a reaction force on the separation control member when the developing unit moves to the spaced position;

[0081] The reaction force is in a direction perpendicular to a line N2 connecting a rotation center of the developing unit and a contact point between the separation control member and the second force receiving portion;

[0082] The reaction force is in a direction above a line N3 connecting a rotation point of the separation control member and the contact point when the developing unit moves to the spaced position.

[0083] According to an aspect of the present application, there is provided still another process cartridge for detachably mounting in a main assembly of an image forming apparatus, the process cartridge comprising a drum unit, a developing unit, a developing coupling, a first force receiving portion and a second force receiving portion;

[0084] The drum unit comprises a drum frame, a photosensitive drum rotatably provided on the drum frame, and a charging member provided on the drum frame for charging the photosensitive drum, an axis of the photosensitive drum extending in a first direction;

[0085] The developing unit comprises a developing frame and a developing roller rotatably provided on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged to the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum;

[0086] The developing coupling is provided on the developing unit for receiving a rotational driving force and transmitting the rotational driving force to the developing roller;

[0087] The first force receiving portion and the second force receiving portion are provided on the developing unit, the first force receiving portion is for receiving a contact force for moving the developing unit to the developing position, the second force receiving portion is for receiving a separation force for moving the developing unit to the spaced position;

[0088] In the first direction, a line between the center of the charging member and the rotation center of the photosensitive drum is N10, the line N10 and the surface of the photosensitive drum form two intersection points, the intersection point farther from the center of the charging member is the far intersection point MX1, a tangent line N11 of the surface of the photosensitive drum is drawn through the far intersection point MX1, and the center of the charging member and the rotation center of the photosensitive drum are on the same side of the tangent line N11 as the first force receiving portion and / or the second force receiving portion.

[0089] In some embodiments, in the first direction, a line between the rotation center of the photosensitive drum and the rotation center of the developing coupling is N0, an angle between the line N10 and the line N0 is α, and α is in the range of 25°≤α≤45°.

[0090] In some embodiments, the charging member is a corona wire.

[0091] In some embodiments, the drum unit further comprises a cleaning blade fixedly arranged on the drum frame, the cleaning blade being in contact with the photosensitive drum to clean residual toner on the surface of the photosensitive drum.

[0092] The charging member comprises a charging support and a conductive sponge arranged on the charging support, the conductive sponge being in contact with the photosensitive drum, and the charging support at least partially abuts against the cleaning blade.

[0093] In some embodiments, the charging support is fixedly arranged on the drum frame, and the charging support comprises a bottom plate and a vertical plate arranged in cross.

[0094] In some embodiments, further comprising a conductive member receiving and transmitting the voltage of the image forming apparatus.

[0095] The charging member comprises a conductive portion in contact with the conductive member, and the conductive portion is made of a conductive material.

[0096] In some embodiments, the conductive portion is the conductive sponge, or the conductive portion is a portion of the charging support in contact with the conductive member, or the conductive portion is the entire charging support.

[0097] According to an aspect of the present application, another process cartridge is provided, which is detachably mounted on a main assembly of an image forming apparatus, comprising:

[0098] A drum unit comprising a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction.

[0099] The developing unit comprises a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in a first direction; the developing unit is oppositely arranged to the drum unit in a second direction and is movable relative to the drum unit around a rotation center between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum;

[0100] A first elastic member is arranged between the drum unit and the developing unit and is capable of pushing the developing unit in a direction from the spaced position towards the developing position;

[0101] In the developing position, a gravity moment around the rotation center generated by the self-weight of the developing unit is in the same direction as an elastic moment around the rotation center generated by the first elastic member;

[0102] In the spaced position, a gravity moment around the rotation center generated by the self-weight of the developing unit is in the opposite direction as an elastic moment around the rotation center generated by the first elastic member.

[0103] In some embodiments, the developing unit comprises a charging member movably arranged on the developing frame, the charging member is located on a side of the developing unit close to the drum unit in the second direction, and the charging member is capable of contacting the photosensitive drum to charge the photosensitive drum.

[0104] In some embodiments, the charging member is movably connected to the developing frame through a support frame.

[0105] In some embodiments, the developing frame is provided with a first pivot joint, and one end of the support frame is provided with a second pivot joint rotationally matched with the first pivot joint.

[0106] In some embodiments, the other end of the support frame is provided with an engaging portion connected with a shaft of the charging member, and the engaging portion is a claw structure.

[0107] In some embodiments, a force applying elastic member is further included, the force applying elastic member is in abutment with the support frame and the developing frame, and is used to apply an acting force on the charging member to make the charging member tightly contact the photosensitive drum.

[0108] In some embodiments, the developing frame is provided with a counterweight, and the counterweight is located on a side of the developing frame close to the drum unit in the second direction.

[0109] In some embodiments, in the spaced position, at least a part of the developing unit abuts against the drum unit.

[0110] In some embodiments, when viewed in the first direction, a center of gravity of the developing unit is located on a side of the drum unit away from a vertical line of the rotation center of the developing unit in the developing position; and the center of gravity of the developing unit is located on a side of the drum unit close to the vertical line of the rotation center of the developing unit in the interval position.

[0111] In some embodiments, a gravity moment of the developing unit around the rotation center is greater than an elastic moment of the first elastic member around the rotation center.

[0112] In some embodiments, when the developing unit receives a contact force from the image forming apparatus, a sum of a moment of the contact force and the elastic moment of the first elastic member is greater than the gravity moment of the developing unit around the rotation center.

[0113] According to an aspect of the present application, there is provided still another process cartridge detachably mountable to a main assembly of an image forming apparatus, comprising:

[0114] a drum unit including a drum frame and a photosensitive drum rotatably provided on the drum frame, an axis of the photosensitive drum extending in a first direction;

[0115] the developing unit including a developing frame and a developing roller rotatably provided on the developing frame, an axis of the developing roller extending in the first direction; the developing unit being oppositely arranged to the drum unit in a second direction, the developing roller being in contact with the photosensitive drum at all times;

[0116] a force receiving portion for receiving an acting force from the image forming apparatus to move a moving member provided on the drum unit or the developing unit.

[0117] In some embodiments, the image forming apparatus includes a transfer belt cooperating with the photosensitive drum, and the moving member includes a transfer belt acting member.

[0118] the transfer belt acting member being capable of extending and contacting the transfer belt when the force receiving portion receives the second acting force from the image forming apparatus; and the transfer belt acting member being capable of retracting and disengaging from the transfer belt when the force receiving portion receives the first acting force from the image forming apparatus.

[0119] In some embodiments, the force receiving portion includes a force receiving member, the force receiving member being provided with a first force receiving portion for receiving the first acting force and a second force receiving portion for receiving the second acting force, the force receiving member moving and driving the transfer belt acting member to extend and contact the transfer belt when the second force receiving portion receives the second acting force, and the force receiving member moving and driving the transfer belt acting member to retract and disengage from the transfer belt when the first force receiving portion receives the first acting force.

[0120] In some embodiments, the belt acting member is capable of extending and contacting the transfer belt to clean the transfer belt of the developer;

[0121] Alternatively, the belt acting member is capable of extending and contacting the transfer belt and applying pressure to the transfer belt such that the contact area of the photoconductive drum with the transfer belt is reduced.

[0122] In some embodiments, the movable member is a first charging mechanism movably disposed on the drum frame, the first charging mechanism being movable between an operating position and a shielding position.

[0123] In some embodiments, a transmission unit is further included in transmission connection with the first charging mechanism, the transmission unit being used to control movement of the first charging mechanism;

[0124] The force receiving portion is in transmission connection with the transmission unit to control movement of the transmission unit.

[0125] In some embodiments, the movable member is a second charging mechanism movably disposed on the drum frame, the drum frame being provided with a space for movement of the second charging mechanism;

[0126] The space has a first movement target position and a second movement target position;

[0127] The force receiving portion includes a transmission mechanism connected between the developing unit and the second charging mechanism to drive the second charging mechanism to move in the space;

[0128] When the transmission mechanism drives the second charging mechanism to move from the first movement target position to the second movement target position, the second charging mechanism is in a separated state from the photoconductive drum, and the second charging mechanism is capable of shielding a laser beam that is to be irradiated on the photoconductive drum.

[0129] In some embodiments, the transmission mechanism includes:

[0130] A first transmission member in rotational connection with the developing frame and capable of receiving an acting force of the image forming apparatus to rotate;

[0131] A second transmission member having a first end and a second end, the first end being connected with the first transmission member, and the second end being connected with the second charging mechanism;

[0132] The first transmission member drives the second end to move the second charging mechanism in the space by applying an acting force on the first end.

[0133] In some embodiments, the first sliding structure is arranged in the space for yielding;

[0134] The first sliding structure extends in a direction capable of reaching the first moving target position and the second moving target position, so that the second charging mechanism limits and slides in the space for yielding.

[0135] In some embodiments, the second charging mechanism comprises a charging roller support and a charging roller arranged on the charging roller support:

[0136] The charging roller support is in sliding cooperation with the first sliding structure through a sliding block part;

[0137] A second sliding structure is further arranged on the charging roller support, and the charging roller support is in sliding connection with the transmission mechanism through the second sliding structure.

[0138] In some embodiments, the drum unit further comprises a drum coupling for receiving a driving force from the image forming device to drive the photosensitive drum to rotate;

[0139] The developing unit further comprises a driving force receiving part for receiving a driving force from the image forming device to drive the developing roller to rotate;

[0140] The drum coupling and the driving force receiving part constitute the movable part;

[0141] The force receiving part comprises a force receiving component and an axial telescopic structure;

[0142] When the force receiving component receives a first force from the image forming device, it rotates and drives the axial telescopic structure to move, and the movement of the axial telescopic structure drives the drum coupling and the driving force receiving part to axially extend, so as to receive the driving force from the image forming device;

[0143] When the force receiving component receives a second force from the image forming device, it rotates and drives the axial telescopic structure to move, and the movement of the axial telescopic structure drives the drum coupling and the driving force receiving part to axially retract, so as to not receive the driving force from the image forming device.

[0144] In some embodiments, the force receiving component comprises a third action structure, and the axial telescopic structure comprises a fourth action structure;

[0145] The force receiving component is arranged to be rotatable about its rotation axis, and the rotation axis of the force receiving component is parallel to and does not coincide with the rotation axis of the driving force receiving part; when the force receiving component rotates, the third action structure and the fourth action structure act to make the axial telescopic structure move in the axial direction.

[0146] In some embodiments, the drum frame includes a driving side end cover, the axial extension structure is axially movable but non-rotatable arranged on the driving side end cover, and the force receiving component is rotatable but non-axially movable arranged on the driving side end cover.

[0147] In some embodiments, the drum unit further includes a drum elastic member abutting against the drum coupling to drive the drum coupling to extend axially, and the developing unit further includes a developing elastic member abutting against the driving force receiving portion to drive the driving force receiving portion to extend axially.

[0148] In some embodiments, the process cartridge further includes a first elastic member for keeping the developing roller and the photosensitive drum in contact in any state.

[0149] According to an aspect of the present application, there is provided another process cartridge for detachably mounting in a main assembly of an image forming apparatus, the main assembly being provided with a separation control member, the process cartridge comprising:

[0150] a drum unit including a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction;

[0151] a developing unit including a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in the first direction, the developing unit being oppositely arranged to the drum unit in a second direction and movable relative to the drum unit between a developing position in which the developing roller is in contact with the photosensitive drum and a spaced position in which the developing roller is at least partially spaced apart from the photosensitive drum;

[0152] a developing coupling for receiving a rotational driving force and transmitting the rotational driving force to the developing roller;

[0153] when the developing unit is moved between the developing position and the spaced position, the developing frame is axially moved relative to the developing coupling in the first direction;

[0154] when the developing unit is moved between the developing position and the spaced position, the developing coupling is not moved relative to the drum frame.

[0155] In some embodiments, further comprising a force receiving member fixedly arranged on the developing frame, the force receiving member including a first force receiving portion and a second force receiving portion;

[0156] when the second force receiving portion receives a second acting force applied by the separation control member to move the developing unit from the developing position to the spaced position, the developing frame is axially moved relative to the developing coupling in the first direction;

[0157] When the first force receiving part receives the first force applied by the separation control component to move the developing unit from the interval position to the developing position, the developing frame moves axially in the first direction relative to the developing coupling.

[0158] In some embodiments, further comprising a first clamping part arranged on the drum frame and a second clamping part arranged on the developing frame;

[0159] The first clamping part comprises a first acting part, a third acting part and a second acting part arranged in sequence in the second direction, the first acting part being closest to the axis of the photosensitive drum in the second direction;

[0160] The second clamping part can cooperate with the first acting part to keep the developing unit in the developing position;

[0161] The second clamping part can cooperate with the second acting part to keep the developing unit in the interval position.

[0162] In some embodiments, the first acting part has a first inclined surface, the second acting part has a second inclined surface, and when the second clamping part moves along the first inclined surface or the second inclined surface, the developing frame moves axially in the first direction relative to the developing coupling.

[0163] In some embodiments, further comprising a force receiving member slidingly arranged on the developing frame, the force receiving member comprising a first force receiving part and a second force receiving part;

[0164] When the second force receiving part receives the second force applied by the separation control component to unlock, the developing frame can move axially in the first direction relative to the developing coupling and the force receiving member can move in the second direction relative to the developing frame;

[0165] When the first force receiving part receives the first force applied by the separation control component to lock, the developing frame can move axially in the first direction relative to the developing coupling and the force receiving member can move in the second direction relative to the developing frame.

[0166] In some embodiments, further comprising a first clamping part arranged on the drum frame and a second clamping part arranged on the force receiving member;

[0167] The first clamping part comprises a second acting part, the second acting part being a surface inclined relative to the first direction, and when the first force receiving part receives the force of the separation control component to move along the second acting part, the developing frame is driven to move axially in the first direction.

[0168] In some embodiments, the first clamping portion comprises a first acting portion connected with the second acting portion and closer to the axis of the photosensitive drum in the second direction than the second acting portion, and the force receiving member and the second clamping portion are locked when the second clamping portion abuts against the first acting portion, and the developing frame cannot move axially in the first direction.

[0169] In some embodiments, the developing coupling generates an axial force when driving the developing roller to rotate, and the developing frame can move axially in the first direction under the axial force.

[0170] In some embodiments, the developing frame is provided with a second limiting portion for limiting movement of the force receiving member in the second direction.

[0171] In some embodiments, a tenth elastic member is arranged between the developing coupling and the developing frame, and the tenth elastic member applies a force in the opposite direction to the axial direction to the developing coupling and the developing frame.

[0172] In some embodiments, the first clamping portion and the second clamping portion are further arranged on the drum frame and the developing frame.

[0173] The first clamping portion comprises a second acting portion, and the second acting portion is a surface inclined with respect to the first direction, and the second clamping portion can abut against the second acting portion to keep the developing unit in the spaced position.

[0174] In some embodiments, the force receiving member is provided with a locking portion, the first clamping portion comprises a first acting portion connected with the second acting portion and closer to the axis of the photosensitive drum in the second direction than the second acting portion, and the force receiving member and the second clamping portion are locked when the second clamping portion abuts against the first acting portion, and the developing frame cannot move axially in the first direction.

[0175] In some embodiments, the developing frame is provided with a bearing cover, and the developing coupling is arranged on the bearing cover and can move axially in the first direction with respect to the bearing cover.

[0176] In some embodiments, the force receiving member is slidingly arranged on the bearing cover.

[0177] In some embodiments, the force receiving member is provided with a fourth sliding groove, the drum frame is provided with a separation guide portion matched with the fourth sliding groove, and the separation guide portion is provided with a separation guide inclined surface inclined with respect to the first direction and the second direction.

[0178] In some embodiments, when the force receiving member receives the second force of the separation control component in the second direction to move, the end of the fourth sliding groove slides along the separation guide slope to jointly move the force receiving member and the developing frame in the first direction.

[0179] The present application has the following advantages: the separation force receiving surface receiving the separation force and the separation abutting surface maintaining the separation state are integrated in one force receiving member, which simplifies the structure of the process cartridge, reduces the number of parts, and saves cost. BRIEF DESCRIPTION OF DRAWINGS

[0180] FIG. 1 is a sectional view of an image forming apparatus according to the prior art.

[0181] FIG. 2 is a perspective view of the image forming apparatus according to the prior art.

[0182] FIG. 3 is a perspective view of a developing separation control unit according to the prior art.

[0183] FIG. 4 is another sectional view of the image forming apparatus according to the prior art.

[0184] FIG. 5 is a perspective view of a process cartridge from a driving side according to an embodiment of the present application.

[0185] FIG. 6 is a perspective view of the process cartridge from a conductive side according to the embodiment of the present application.

[0186] FIG. 7 is a structure exploded view of the process cartridge according to the embodiment of the present application.

[0187] FIG. 8 is a perspective view of the process cartridge from the driving side after a front door is closed and a separation control component is in an intermediate position according to the embodiment of the present application.

[0188] FIG. 9 is a state view of the process cartridge according to the embodiment of the present application in which the separation control component is in a force applying position.

[0189] FIG. 10 is another state view of the process cartridge according to the embodiment of the present application in which the separation control component is in the intermediate position.

[0190] FIG. 11 is another state view of the process cartridge according to the embodiment of the present application in which the separation control component is in the force applying position.

[0191] FIG. 12 is a perspective view of a process cartridge from a driving side according to another embodiment of the present application.

[0192] FIG. 13 is a perspective view of the process cartridge from a conductive side according to the another embodiment of the present application.

[0193] FIG. 14 is a structure exploded view of the process cartridge according to the another embodiment of the present application.

[0194] Fig. 15 is a structural diagram of a driving-side end cover according to the second embodiment of the present application.

[0195] Fig. 16 is a structural diagram of a developing cover according to the second embodiment of the present application.

[0196] Fig. 17 is a partial cross-sectional view of a driving side of the process cartridge according to the second embodiment of the present application in a separated state.

[0197] Fig. 18 is an enlarged structural diagram of a position A in Fig. 17.

[0198] Fig. 19 is a partial cross-sectional view of a driving side of the process cartridge according to the second embodiment of the present application in a contacted state.

[0199] Fig. 20 is an enlarged structural diagram of a position B in Fig. 19.

[0200] Fig. 21 is a structural diagram of a driving-side end cover according to a modification of the second embodiment of the present application.

[0201] Fig. 22 is a structural diagram of a developing cover according to the modification of the second embodiment of the present application.

[0202] Fig. 23 is a structural exploded view of a conductive side of the process cartridge according to the modification of the second embodiment of the present application.

[0203] Fig. 24 is a structural diagram of a conductive-side end cover according to the modification of the second embodiment of the present application.

[0204] Fig. 25 is a partial view of a driving side of the process cartridge according to the modification of the second embodiment of the present application in a separated state.

[0205] Fig. 26 is a partial view of a driving side of the process cartridge according to the modification of the second embodiment of the present application in a contacted state.

[0206] Fig. 27 is a structural diagram of a driving-side end cover according to the third embodiment of the present application.

[0207] Fig. 28 is a structural diagram of a developing cover according to the third embodiment of the present application.

[0208] Fig. 29 is a view of a driving side of the process cartridge according to the third embodiment of the present application in a contacted state.

[0209] Fig. 30 is a view of a driving side of the process cartridge according to the third embodiment of the present application in a separated state (part of the structure is omitted).

[0210] Fig. 31 is a front view of a driving side of the process cartridge according to the fourth embodiment of the present application.

[0211] Fig. 32 is a structural view of a driving side end cover of Embodiment 4 according to the present application.

[0212] Fig. 33 is a front view of a driving side of the process cartridge of Embodiment 5 according to the present application.

[0213] Fig. 34 is a partially exploded structural view of the process cartridge of Embodiment 5 according to the present application.

[0214] Fig. 35 is an exploded view of the process cartridge of Embodiment 6 according to the present application.

[0215] Fig. 36 is a structural view of a developing cover of Embodiment 6 according to the present application.

[0216] Fig. 37 is an exploded view of a conductive end of the process cartridge of Embodiment 6 according to the present application.

[0217] Fig. 38 is a sectional view of the conductive end of the process cartridge of Embodiment 6 according to the present application.

[0218] Fig. 39 is a structural view of a first engaging portion of Embodiment 6 according to the present application.

[0219] Fig. 40 is a structural view of a second engaging portion of Embodiment 6 according to the present application.

[0220] Fig. 41 is a view of the engagement of the process cartridge of Embodiment 6 according to the present application with a separation control member in a developing position.

[0221] Fig. 42 is a view of a retaining portion of the process cartridge of Embodiment 6 according to the present application in the developing position.

[0222] Fig. 43 is a view of the engagement of the process cartridge of Embodiment 6 according to the present application with the separation control member in a separation position.

[0223] Fig. 44 is a view of the retaining portion of the process cartridge of Embodiment 6 according to the present application in the separation position.

[0224] Fig. 45 is a view of the engagement of the process cartridge of Embodiment 6 according to the present application with the separation control member in the separation position.

[0225] Fig. 46 is a view of the retaining portion of the process cartridge of Embodiment 6 according to the present application in the separation position.

[0226] Fig. 47 is a view of the engagement of the process cartridge of Embodiment 6 according to the present application with the separation control member in the separation position.

[0227] Fig. 48 is a view of the retaining portion of the process cartridge of Embodiment 6 according to the present application in the separation position.

[0228] Fig. 49 is a partial sectional view and a partial enlarged view of the process cartridge according to Embodiment 6.

[0229] Fig. 50 is a schematic view of the drive-side end cover and the blocking member of the process cartridge according to Embodiment 6.

[0230] Fig. 51 is an exploded schematic view of the drive end of the process cartridge according to Embodiment 7.

[0231] Fig. 52 is a schematic view of the structure of the drive-side end cover according to Embodiment 7.

[0232] Fig. 53 is a schematic view of the structure of the developing cover according to Embodiment 7.

[0233] Fig. 54 is a partial schematic view of the separation control member when the process cartridge according to Embodiment 7 is in the developing position and in the intermediate position.

[0234] Fig. 55 is a schematic view of the cooperation between the process cartridge according to Embodiment 7 and the separation control member when the process cartridge is moved from the developing position to the spaced position.

[0235] Fig. 56 is a schematic view of the cooperation between the process cartridge according to Embodiment 7 and the separation control member when the process cartridge is in the spaced position.

[0236] Fig. 57 is a schematic view of the distance between the side surface of the first force receiving portion and the outer side surface of the drive-side end cover when the process cartridge according to Embodiment 7 is in the developing position.

[0237] Fig. 58 is a schematic view of the distance between the side surface of the first force receiving portion and the outer side surface of the drive-side end cover when the process cartridge according to Embodiment 7 is in the spaced position.

[0238] Fig. 59 is a schematic view of the drive-side end cover and the blocking member of the process cartridge according to Embodiment 7.

[0239] Fig. 60 is a partial exploded schematic view of the process cartridge according to Embodiment 8.

[0240] Fig. 61 is a schematic view of the structure of the developing cover according to Embodiment 8.

[0241] Fig. 62 is a schematic view of the structure of the drum frame and the first engaging portion according to Embodiment 8.

[0242] Fig. 63 is a perspective view of the cooperation between the first engaging portion and the second engaging portion according to Embodiment 8 in positions A, B, C, D and E.

[0243] Figure 64 is a schematic view of the engagement of the process cartridge of embodiment eight with the separation control member when the process cartridge is in the developing position, according to the present application.

[0244] Figure 65 is a perspective view of the engagement of the first and second engagement portions of the process cartridge of embodiment eight when the process cartridge is in the developing position, according to the present application, with the second engagement portion in position A.

[0245] Figure 66 is a schematic view of the engagement of the process cartridge of embodiment eight with the separation control member when the process cartridge is moving from the developing position to the spaced position, according to the present application.

[0246] Figure 67 is a perspective view of the engagement of the first and second engagement portions of the process cartridge of embodiment eight when the process cartridge is moving from the developing position to the spaced position, according to the present application, with the second engagement portion in position B.

[0247] Figure 68 is a schematic view of the engagement of the process cartridge of embodiment eight with the separation control member when the process cartridge is in the maximum spaced position, according to the present application.

[0248] Figure 69 is a perspective view of the engagement of the first and second engagement portions of the process cartridge of embodiment eight when the process cartridge is in the maximum spaced position, according to the present application, with the second engagement portion in position C.

[0249] Figure 70 is a schematic view of the engagement of the process cartridge of embodiment eight with the separation control member when the process cartridge is held in the spaced position, according to the present application.

[0250] Figure 71 is a perspective view of the engagement of the first and second engagement portions of the process cartridge of embodiment eight when the process cartridge is held in the spaced position, according to the present application, with the second engagement portion in position D.

[0251] Figure 72 is a schematic view of the engagement of the process cartridge of embodiment eight with the separation control member when the process cartridge is moving from the spaced position to the developing position, according to the present application.

[0252] Figure 73 is a perspective view of the engagement of the first and second engagement portions of the process cartridge of embodiment eight when the process cartridge is moving from the spaced position to the developing position, according to the present application, with the second engagement portion in position E.

[0253] Figure 74 is a schematic view of the engagement of a force receiving member with a separation control member in the prior art.

[0254] Figure 75 is an elevational view of a process cartridge of embodiment nine, according to the present application.

[0255] Figure 76 is an enlarged schematic view of C in Figure 75.

[0256] Figure 77 is a schematic view of the engagement of a force receiving member with a separation control member in the developing position of embodiment nine, according to the present application.

[0257] Figure 78 is a schematic view of the cooperation between the force receiving member and the separation control member of Embodiment 9 of the present application when they are in a spaced position.

[0258] Figure 79 is a schematic view of the process cartridge of prior art CN113574468A showing the laser beam entering the photosensitive drum.

[0259] Figure 80 is a sectional view of the process cartridge of prior art CN113574468A.

[0260] Figure 81 is a schematic view of the structure of the process cartridge of Embodiment 10 of the present application.

[0261] Figure 82 is an exploded view of the process cartridge of Embodiment 10 of the present application.

[0262] Figure 83 is a schematic view of the structure of the drive end of the process cartridge of Embodiment 10 of the present application.

[0263] Figure 84 is a schematic view of the positional relationship between the charging member and other members of Embodiment 10 of the present application.

[0264] Figure 85 is a schematic view of the positional relationship between the charging member and other members of Embodiment 10 of the present application.

[0265] Figure 86 is an exploded view of the non-drive end of the process cartridge of Embodiment 10 of the present application.

[0266] Figure 87 is a schematic view of the structure of the drum unit of the process cartridge of Embodiment 11 of the present application.

[0267] Figure 88 is a schematic view of the structure of the cleaning blade of the process cartridge of Embodiment 11 of the present application.

[0268] Figure 89 is a schematic view of the structure of the charging support portion of the process cartridge of Embodiment 11 of the present application at one angle.

[0269] Figure 90 is a schematic view of the structure of the charging support portion of the process cartridge of Embodiment 11 of the present application at another angle.

[0270] Figure 91 is a schematic view of the cooperation between the charging member and the cleaning blade, the photosensitive drum and the conductive member of the process cartridge of Embodiment 11 of the present application.

[0271] Figure 92 is a schematic view of the structure of the process cartridge of Embodiment 12 of the present application at one angle.

[0272] Figure 93 is a schematic view of the structure of the process cartridge of Embodiment 12 of the present application at another angle.

[0273] Figure 94 is a schematic view of the structure of the developing unit of Embodiment 12 of the present application.

[0274] Fig. 95 is a schematic view of a partial structure of the process cartridge according to Embodiment 12 of the present application.

[0275] Fig. 96 is a schematic view of an enlarged portion of Fig. 95.

[0276] Fig. 97 is a schematic view of a non-driving end of the process cartridge according to Embodiment 12 of the present application.

[0277] Fig. 98 is a schematic view of a support frame of the process cartridge according to Embodiment 12 of the present application.

[0278] Fig. 99 is a front view of a driving end of the process cartridge according to Embodiment 12 of the present application in a developing position.

[0279] Fig. 100 is a front view of a driving end of the process cartridge according to Embodiment 12 of the present application in an interval position.

[0280] Fig. 101 is a schematic view of a process cartridge according to Embodiment 13 of the present application.

[0281] Fig. 102 is a schematic view of a developing unit according to Embodiment 13 of the present application.

[0282] Fig. 103 is a front view of a driving end of the process cartridge according to Embodiment 13 of the present application in an interval position.

[0283] Fig. 104 is a schematic view of a process cartridge and a separation control member according to Embodiment 14 of the present application.

[0284] Fig. 105 is a schematic view of a developing cover and a force receiving portion according to Embodiment 14 of the present application.

[0285] Fig. 106 is a schematic view of a partial structure of the process cartridge according to Embodiment 14 of the present application.

[0286] Fig. 107 is a schematic view of the force receiving portion and the separation control member in an intermediate position according to Embodiment 14 of the present application.

[0287] Fig. 108 is a schematic view of the force receiving portion and the separation control member in a developing position according to Embodiment 14 of the present application.

[0288] Fig. 109 is a schematic view of the force receiving portion and the separation control member in an interval position according to Embodiment 14 of the present application.

[0289] Fig. 110 is a schematic view of a partial structure of the process cartridge according to Embodiment 15 of the present application.

[0290] Fig. 111 is a schematic view of the force receiving portion of the embodiment 15 of the present application cooperating with the separation control member in an intermediate position.

[0291] Fig. 112 is a schematic view of the force receiving portion of the embodiment 15 of the present application cooperating with the separation control member when the process cartridge is in a developing position.

[0292] Fig. 113 is a schematic view of the force receiving portion of the embodiment 15 of the present application cooperating with the separation control member when the process cartridge is in a spacing position.

[0293] Fig. 114 is a schematic view of the overall structure of the process cartridge of the embodiment 16 of the present application.

[0294] Fig. 115 is a schematic view of the structure of the first charging mechanism of the embodiment 16 of the present application.

[0295] Fig. 116 is a schematic view of the structure of the driving end of the drum unit of the embodiment 16 of the present application.

[0296] Fig. 117 is a schematic view of the structure of the conductive end of the drum unit of the embodiment 16 of the present application at one angle.

[0297] Fig. 118 is a schematic view of the structure of the conductive end of the drum unit of the embodiment 16 of the present application at another angle.

[0298] Fig. 119 is a schematic view of the driving side end cover and the transmission unit, the force receiving portion of the embodiment 16 of the present application.

[0299] Fig. 120 is a schematic view of the structure of the swing force receiving member of the embodiment 16 of the present application.

[0300] Fig. 121 is a schematic view of the structure of the reset force receiving member of the embodiment 16 of the present application.

[0301] Fig. 122 is a schematic view of the structure of the transmission lever of the embodiment 16 of the present application.

[0302] Fig. 123 is a schematic view of the cooperation between the force receiving portion and the transmission unit of the embodiment 16 of the present application in an operating state.

[0303] Fig. 124 is a schematic view of the cooperation between the force receiving portion and the transmission unit of the embodiment 16 of the present application in a non-operating state.

[0304] Fig. 125 is a schematic view of the structure of the process cartridge of the embodiment 16 of the present application in a non-operating state.

[0305] Fig. 126 is a schematic view of the structure of the process cartridge of the embodiment 17 of the present application.

[0306] FIG. 127 is an enlarged view of E in FIG. 126.

[0307] FIG. 128 is a structural schematic view of a force receiving member according to Embodiment 17.

[0308] FIG. 129 is a structural schematic view of a driving side of a process cartridge according to Embodiment 17 (force receiving member is omitted).

[0309] FIG. 130 is a structural schematic view of an action guide according to Embodiment 17.

[0310] FIG. 131 is a structural schematic view of a modified example of Embodiment 17.

[0311] FIG. 132 is an enlarged view of F in FIG. 131.

[0312] FIG. 133 is a structural schematic view of a process cartridge according to Embodiment 18.

[0313] FIG. 134 is a perspective structural schematic view of a driving side end cover according to Embodiment 18.

[0314] FIG. 135 is a schematic view of a charging roller positioned at a first movement target position according to Embodiment 18.

[0315] FIG. 136 is a schematic view of a charging roller positioned at a second movement target position according to Embodiment 18.

[0316] FIG. 137 is a perspective structural schematic view of a transmission mechanism according to Embodiment 18.

[0317] FIG. 138 is a structural schematic view of a first transmission member according to Embodiment 18.

[0318] FIG. 139 is an enlarged view of Q in FIG. 138.

[0319] FIG. 140 is a schematic view of a first slide groove position arrangement on a drum frame according to Embodiment 18.

[0320] FIG. 141 is a perspective structural schematic view of a developing frame according to Embodiment 18.

[0321] FIG. 142 is a perspective structural schematic view of a second charging mechanism according to Embodiment 18.

[0322] FIG. 143 is a perspective structural schematic view of a charging roller support according to Embodiment 18.

[0323] FIG. 144 is a structural schematic view of a process cartridge according to Embodiment 19.

[0324] FIG. 145 is a schematic configuration view of the process cartridge of Embodiment 19 of the present application (omitting the driving-side end cover).

[0325] FIG. 146 is a schematic configuration view of the driving side of the process cartridge of Embodiment 19 of the present application.

[0326] FIG. 147 is a schematic configuration view of the driving side (omitting the gear portion) of the process cartridge of Embodiment 19 of the present application.

[0327] FIG. 148 is an exploded schematic configuration view of the driving side of the process cartridge of Embodiment 19 of the present application.

[0328] FIG. 149 is a schematic configuration view of the driving-side end cover in FIG. 148.

[0329] FIG. 150 is a sectional view of the driving side of the process cartridge of Embodiment 19 of the present application.

[0330] FIG. 151 is a schematic configuration view of the force receiving member and the axial telescopic structure of Embodiment 19 of the present application.

[0331] FIG. 152 is a perspective view of the driving side of the process cartridge of Embodiment 19 of the present application in the interval position.

[0332] FIG. 153 is a perspective view of the driving side of the process cartridge of Embodiment 19 of the present application in the developing position.

[0333] FIG. 154 is a schematic configuration view of the process cartridge of Embodiment 20 of the present application.

[0334] FIG. 155 is a schematic configuration view of the driving side of the process cartridge of Embodiment 20 of the present application (omitting the driving-side end cover), in which the force receiving member is in the second engagement position.

[0335] FIG. 156 is a schematic configuration view of the driving side of the process cartridge of Embodiment 20 of the present application from another perspective.

[0336] FIG. 157 is an exploded view of the driving side of the process cartridge of Embodiment 20 of the present application.

[0337] FIG. 158 is a schematic configuration view of the driving side of the process cartridge of Embodiment 20 of the present application, in which the drum coupling and the driving force receiving portion are in the extended position and the force receiving member is in the second engagement position.

[0338] FIG. 159 is a schematic configuration view of the driving side of the process cartridge of Embodiment 20 of the present application (omitting the driving-side end cover), in which the force receiving member is in the first engagement position.

[0339] Fig. 160 is a structural schematic view of the driving side of the process cartridge of Embodiment Twenty, in which the drum coupling and the driving force receiving portion are in the retracted position, and the force receiving member is in the first engagement position.

[0340] Fig. 161 is a structural schematic view of the drum coupling of Embodiment Twenty-One.

[0341] Fig. 162 is a structural schematic view of the driving force receiving portion of Embodiment Twenty-One.

[0342] Fig. 163 is a structural schematic view of the overall structure of the process cartridge of Embodiment Twenty-Two.

[0343] Fig. 164 is a partially exploded schematic view of the process cartridge of Embodiment Twenty-Two.

[0344] Fig. 165 is a structural schematic view of the driving side end cover and the separation mechanism of Embodiment Twenty-Two, from one angle.

[0345] Fig. 166 is a structural schematic view of the driving side end cover and the separation mechanism of Embodiment Twenty-Two, from another angle.

[0346] Fig. 167 is a structural schematic view of the force receiving member of Embodiment Twenty-Two.

[0347] Fig. 168 is a structural schematic view of the photosensitive driving cover of Embodiment Twenty-Two.

[0348] Fig. 169 is a driving end elevational view of the process cartridge of Embodiment Twenty-Two, in the developing position, with the driving side end cover omitted.

[0349] Fig. 170 is a driving end elevational view of the process cartridge of Embodiment Twenty-Two, in the spacing position, with the driving side end cover omitted.

[0350] Fig. 171 is a partial structural schematic view of the driving end of the process cartridge of Embodiment Twenty-Three.

[0351] Fig. 172 is a structural schematic view of the force receiving member of Embodiment Twenty-Three.

[0352] Fig. 173 is a partial structural schematic view of the drum frame and the transmission abutment portion of Embodiment Twenty-Three.

[0353] Fig. 174 is a driving end elevational view of the process cartridge of Embodiment Twenty-Three, in the developing position, with the driving side end cover omitted.

[0354] Figure 175 is a driving end front view of the process cartridge of Embodiment Twenty-Three of the present application, with the driving side end cover omitted, in the spaced position.

[0355] Figure 176 is a schematic view of the structure of the process cartridge of Embodiment Twenty-Four of the present application.

[0356] Figure 177 is a partial cross-sectional view of the driving end of the process cartridge of Embodiment Twenty-Four of the present application.

[0357] Figure 178 is a partial exploded view of the driving end of the process cartridge of Embodiment Twenty-Four of the present application.

[0358] Figure 179 is a schematic view of the force receiving member of Embodiment Twenty-Four of the present application, from one angle.

[0359] Figure 180 is a schematic view of the force receiving member of Embodiment Twenty-Four of the present application, from another angle.

[0360] Figure 181 is a schematic view of the force receiving member and the developing cover of Embodiment Twenty-Four of the present application.

[0361] Figure 182 is a schematic view of the axial extension structure of Embodiment Twenty-Four of the present application.

[0362] Figure 183 is a schematic view of the driving side end cover of Embodiment Twenty-Four of the present application.

[0363] Figure 184 is a schematic view of the driving force receiving portion of Embodiment Twenty-Four of the present application, in the extended position.

[0364] Figure 185 is a schematic view of the driving side end cover, the axial extension structure, and the force receiving member of Embodiment Twenty-Four of the present application, in cooperation, with the driving force receiving portion in the extended position.

[0365] Figure 186 is a schematic view of the driving force receiving portion of Embodiment Twenty-Four of the present application, in the retracted position.

[0366] Figure 187 is a schematic view of the driving side end cover, the axial extension structure, and the force receiving member of Embodiment Twenty-Four of the present application, in cooperation, with the driving force receiving portion in the retracted position.

[0367] Figure 188 is a schematic view of the overall structure of the process cartridge of Embodiment Twenty-Five of the present application.

[0368] Figure 189 is a cross-sectional view of the driving end of the process cartridge of Embodiment Twenty-Five of the present application.

[0369] Figure 190 is an exploded schematic view of the driving end of the process cartridge of Embodiment Twenty-Five of the present application.

[0370] Fig. 191 is a structural schematic view of a driving-side end cover according to Embodiment 25 of the present invention.

[0371] Fig. 192 is a structural schematic view of a developing shield according to Embodiment 25 of the present invention.

[0372] Fig. 193 is a schematic view of the engagement of a first engaging portion and a second engaging portion of a process cartridge according to Embodiment 25 of the present invention in a developing position.

[0373] Fig. 194 is a schematic view of the engagement of a first engaging portion and a second engaging portion of a process cartridge according to Embodiment 25 of the present invention in an interval position.

[0374] Fig. 195 is an exploded schematic view of a driving end of a process cartridge according to Embodiment 26 of the present invention.

[0375] Fig. 196 is a structural schematic view of a driving-side end cover according to Embodiment 26 of the present invention.

[0376] Fig. 197 is a force analysis diagram of a gear of a process cartridge according to Embodiment 26 of the present invention.

[0377] Fig. 198 is a schematic view of the engagement of a first engaging portion and a second engaging portion of a process cartridge according to Embodiment 26 of the present invention in a developing position.

[0378] Fig. 199 is a schematic view of the engagement of a first engaging portion and a second engaging portion of a process cartridge according to Embodiment 26 of the present invention in an interval position.

[0379] Fig. 200 is a sectional view of a driving end of a process cartridge according to a modification of Embodiment 26 of the present invention.

[0380] Fig. 201 is a structural schematic view of a developing shield according to Embodiment 27 of the present invention.

[0381] Fig. 202 is a schematic view of the locking engagement of a first engaging portion and a locking portion of a process cartridge according to Embodiment 27 of the present invention in a developing position.

[0382] Fig. 203 is a schematic view of the unlocking engagement of a first engaging portion and a locking portion of a process cartridge according to Embodiment 27 of the present invention in a developing position.

[0383] Fig. 204 is a schematic view of the engagement of a first engaging portion and a second engaging portion of a process cartridge according to Embodiment 27 of the present invention in an interval position.

[0384] Fig. 205 is an exploded schematic view of a process cartridge according to Embodiment 28 of the present invention.

[0385] Figure 206 is an exploded schematic view of the driving end of the process cartridge of Embodiment Twenty-Eight.

[0386] Figure 207 is a schematic view of the structure of the driving side end cover of the process cartridge of Embodiment Twenty-Eight.

[0387] Figure 208 is a schematic view of the locking engagement of the first and second engaging portions and the locking portion of the process cartridge of Embodiment Twenty-Eight in the developing position.

[0388] Figure 209 is a schematic view of the engagement of the first and second engaging portions of the process cartridge of Embodiment Twenty-Eight in the intermediate position.

[0389] Figure 210 is a schematic view of the structure of the process cartridge of Embodiment Twenty-Nine omitting portions of the driving side end cover.

[0390] Figure 211 is a partial schematic view of the separation control member of the process cartridge of Embodiment Twenty-Nine in the developing position and in the intermediate position.

[0391] Figure 212 is a schematic view of the engagement of the separation control member and the process cartridge of Embodiment Twenty-Nine moving from the developing position to the intermediate position.

[0392] Figure 213 is another schematic view of the engagement of the separation control member and the process cartridge of Embodiment Twenty-Nine moving from the developing position to the intermediate position.

[0393] Figure 214 is a schematic view of the engagement of the separation control member and the process cartridge of Embodiment Twenty-Nine in the intermediate position.

[0394] Figure 215 is another schematic view of the engagement of the separation control member and the process cartridge of Embodiment Twenty-Nine in the intermediate position.

[0395] Figure 216 is a schematic view of the engagement of the first abutment portion, the force receiving member, and the separation control member of the process cartridge of Embodiment Twenty-Nine.

[0396] Figure 217 is a schematic view of the separation control member of the process cartridge of Embodiment Thirty in the developing position and in the intermediate position.

[0397] Figure 218 is an exploded schematic view of the driving end of the process cartridge of Embodiment Thirty.

[0398] Figure 219 is a partial schematic view of the conductive end of the process cartridge of Embodiment Thirty in the developing position.

[0399] Figure 220 is a schematic view of the cooperation between the processing cartridge in the spaced position and the separation control member according to the thirtieth embodiment of the present application.

[0400] Figure 221 is a schematic view of the conductive end of the processing cartridge in the spaced position according to the thirtieth embodiment of the present application.

[0401] Figure 222 is another schematic view of the cooperation between the processing cartridge in the spaced position and the separation control member according to the thirtieth embodiment of the present application.

[0402] Figure 223 is a schematic view of the structure of the processing cartridge according to another embodiment of the thirtieth embodiment of the present application.

[0403] Figure 224 is a schematic view of the structure of the drive side end cover according to another embodiment of the thirtieth embodiment of the present application.

[0404] Figure 225 is a schematic view of the structure of the drive end of the processing cartridge according to another embodiment of the thirtieth embodiment of the present application, in which the drive side end cover is omitted.

[0405] Figure 226 is a schematic view of the structure of the drive end of the processing cartridge according to another embodiment of the thirtieth embodiment of the present application, in which the drive side end cover is omitted. DETAILED DESCRIPTION

[0406] The present application will be further described with reference to the drawings, in which the embodiments described are not intended to be exhaustive or to be limited to the precise form disclosed. While specific embodiments of, and examples for, the present application are described herein for illustrative purposes, various equivalent modifications are possible within the scope of the present application, as those skilled in the relevant art will recognize. The teachings of the present application should not be constrained to only the described embodiments, and thus many modifications, and other implementations are possible.

[0407] It should also be noted that the terms "first", "second" and the like used in the description and in the claims are used to describe various embodiments and are not necessarily intended to refer to a sequence or order of one thing before another, unless specifically stated otherwise. It is to be understood that the terms so used are interchangeable under appropriate circumstances and embodiments of the application are capable of producing more than one dependent object as the claims can follow more than one alternative disclosure.

[0408] In the present application, unless otherwise specifically noted, the terms "mounting", "connecting", "connecting", and the like are used broadly, and can be, for example, fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection, or communication with each other; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0409] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0410] In the above description, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0411] The following several embodiments are further described to illustrate the structure of the process cartridge of the present application. The person skilled in the art can know that more variations can be designed according to the following embodiments, which are all within the protection scope of the present application.

[0412] Embodiment one

[0413] The structure of the image forming apparatus can refer to FIG. 1 to FIG. 4, FIG. 1 is a sectional view of an image forming apparatus in the prior art. FIG. 2 is a perspective view of an image forming apparatus in the prior art. FIG. 3 is a perspective view of a developing-separation control unit in the prior art. FIG. 4 is another sectional view of an image forming apparatus in the prior art.

[0414] As shown in FIG. 1-4, the image forming apparatus 500 is a four-color full-color laser image forming apparatus using electrophotographic process, and forms a color image on a recording material S. The process cartridge is detachably mounted to the image forming apparatus main assembly 502 to form a color image on the recording material S. Four process cartridges P (PY, PM, PC, PK), i.e., a first process cartridge PY, a second process cartridge PM, a third process cartridge PC and a fourth process cartridge PK, are provided in the image forming apparatus main assembly 502, and the four process cartridges P are arranged substantially horizontally.

[0415] Each of the first to fourth process cartridges P (PY, PM, PC, PK) includes the same electrophotographic processing mechanism, but the color of the developer is different. Rotational drive force is transmitted from a drive output portion (not shown) of the image forming apparatus main assembly 502 to the first to fourth process cartridges P. In addition, the image forming apparatus main assembly 502 supplies a bias voltage (a charging bias voltage, a developing bias voltage, etc.) to the first to fourth process cartridges P, respectively.

[0416] As shown in Fig. 1, each of the first to fourth process cartridges P (PY, PM, PC, PK) includes a drum unit 8 rotatably supporting the photosensitive drum 4 and a developing unit 9 provided with a developing roller 6 for developing an electrostatic latent image on the photosensitive drum 4 and rotatably supporting the developing roller 6. The process cartridges P are installed into the image forming apparatus main assembly 502 by one tray 110. Specifically, the tray 110 is configured to be movable in a substantially horizontal direction (Xl and X2 directions) in a state where the image forming apparatus main assembly 502 is installed on a horizontal surface, and the four process cartridges P are installed to each positioning portion of the tray 110, respectively. When the tray 110 is moved into the image forming apparatus main assembly 502, the plurality of process cartridges P are moved into the image forming apparatus main assembly 502 together with the tray 110. When the process cartridges P need to be replaced, the plurality of process cartridges P can be moved outside the image forming apparatus main assembly 502 together with the tray 110.

[0417] As shown in Fig. 2, the front door 111 is closed, and the main assembly side drum drive coupling 180 and the main assembly side developing drive coupling 185 for transmitting drive force to the process cartridges P are protruded in the arrow Yl direction by a link mechanism (not shown). In addition, by opening the front door 111, the drum drive coupling 180 and the developing drive coupling 185 are retracted in the arrow Y2 direction (the Yl and Y2 directions are perpendicular to the Xl and X2 directions, the Zl and Z2 directions, respectively). This is done for the purpose of, on the one hand, better coupling the main assembly side drum drive coupling 180 and the main assembly side developing drive coupling 185 to the drum coupler 15 and the developing coupler 25 (described below) of the process cartridges P, respectively, so that drive force is transmitted. On the other hand, it prevents the insertion / removal of the tray 110 from being obstructed.

[0418] As shown in FIG. 3, the developing separation control unit 195R controls the separation and contact operation of the developing roller 6 with respect to the photosensitive drum 4 by engaging with a portion of the process cartridge P. The developing separation control unit 195R is disposed below the image forming apparatus main assembly 502, and specifically, the developing separation control unit 195R is arranged below (downward along the arrow Z2 direction) the main assembly side drum driving link 180 and the main assembly side developing driving link 185 in the vertical direction (Z1 and Z2 directions). The developing separation control unit 195R includes a separation control member 196R configured to be movable in the W41 and W42 directions by a control mechanism (not shown). The directions W41 and W42 are substantially parallel to the arrangement direction of the process cartridge P disposed in the image forming apparatus main assembly 502, i.e., the W41 and W42 directions are substantially parallel to the X1 and X2 directions. As shown in FIG. 8, the separation control member 196R includes a control portion (protruding portion) 196R1 protruding toward the process cartridge P, and the control portion 196R1 has a first force application surface 196a (contact force application portion) and a second force application surface 196b (separation force application portion).

[0419] 196R1, and the control portion 196R1 has a first force application surface 196a (contact force application portion) and a second force application surface 196b (separation force application portion).

[0420] As shown in FIGS. 3 and 4, in order to engage the developing separation control unit 195R with a portion of the process cartridge P and control the separation and contact operation of the developing roller 6 of the process cartridge P with respect to the photosensitive drum 4, a portion of the separation control member 196R and a portion of the process cartridge P must overlap in the vertical direction (Z1, Z2 directions). In the present embodiment, after the process cartridge P is inserted in the X1 direction, before the front door 111 is closed, at this time the photosensitive drum 4 and the transfer belt 112a are spaced apart from each other with a gap T1 therebetween, this position is referred to as a first internal position of the process cartridge P. After the front door 111 is closed, the tray 110 lowers the process cartridge P in the Z2 direction by a distance T1, so that a portion of the developing unit 9 overlaps a portion of the separation control member 196R in the vertical direction (Z1, Z2 directions), at this time the photosensitive drum 4 and the transfer belt 112a are in contact with each other, this position is referred to as a second internal position of the process cartridge P.

[0421] As shown in FIGS. 5 to 7, for better illustrating the structure of the process cartridge P of the present embodiment, the same image forming apparatus reference X, Y, Z axis concepts, taking three mutually orthogonal spatial axes as the X axis, the Y axis, and the Z axis, defining the length direction (also referred to as the first direction) of the process cartridge P as the Y1, Y2 direction, defining the width direction (also referred to as the second direction) of the process cartridge P as the X1, X2 direction, and defining the height direction (also referred to as the third direction) of the process cartridge P as the Z1, Z2 direction (vertical direction); one side of the process cartridge P in the Y2 direction is the driving side, and one side in the Y1 direction is the conductive side, the drum unit 8 and the developing unit 9 are oppositely arranged in the width direction, the direction from the drum unit 8 to the developing unit 9 is the X1 direction, one end of the process cartridge P along the X1 direction is the rear end, the direction from the developing unit 9 to the drum unit 8 is the X2 direction, and one end along the X2 direction is the front end, one end of the process cartridge P along the Z1 direction is the upper end, and one end along the Z2 direction is the lower end.

[0422] As shown in FIGS. 5 to 7, the present embodiment provides a process cartridge P, which includes a drum unit 8 and a developing unit 9. The drum unit 8 includes a photosensitive drum 4, a charging roller, a cleaning blade, a drum coupling 15, and a drum frame 11, the two sides of the drum frame 11 in the Y axis direction include a driving side end cover 13 and a conductive side end cover 14, the drum frame 11 is a frame structure, the frame encloses a waste powder bin for collecting waste developer, the conductive side end cover 14 is arranged at the Y1 direction of the drum frame 11, and the driving side end cover 13 is arranged at the Y2 direction of the drum frame 11; the two ends of the photosensitive drum 4 in the length direction (Y1, Y2 direction) are rotatably mounted / supported on the driving side end cover 13 and the conductive side end cover 14, and the photosensitive drum 4 is arranged at the Z2 direction side (lower end) of the drum frame 11; the two ends of the charging roller in the length direction (Y1, Y2 direction) are also mounted on the drum frame 11, and the charging roller is used to uniformly charge the surface of the photosensitive drum 4, so that the photosensitive drum 4 can adsorb the developer; the drum coupling 15 is connected with the Y2 direction side of the photosensitive drum 4 and is rotatably mounted on the driving side end cover 13, and is used to receive the driving force from the main assembly side drum driving coupling 180 of the image forming apparatus.

[0423] The driving side end cover 13 is provided with a first rotating hole 131 and a second rotating hole 132, both of which are through hole structures on the driving side end cover 13, and the rotating shaft of the first rotating hole 131 is in the Y-axis direction. In the Z-axis (height) direction, the first rotating hole 131 is closer to the upper side of the drum frame 11 than the photosensitive drum 4. In addition, the developing unit 9 is rotatably mounted on the drum frame 11, specifically, one end of the developing unit 9 in the length direction (Y2 direction) is rotatably mounted on the first rotating hole 131 of the driving side end cover 13, and one end of the developing unit 9 in the length direction (Y1 direction) is rotatably mounted on the conductive side end cover 14, so that the developing unit 9 can rotate around the rotating shaft of the first rotating hole 131. The second rotating hole 132 is closer to the Z2 direction side (lower end) of the driving side end cover 13, and the drum coupling 15 is rotatably mounted in the second rotating hole 132 and drives the photosensitive drum 4, and the part of the drum coupling 15 exposed outside the second rotating hole 132 can receive the driving force of the image forming device.

[0424] As shown in FIGS. 5 to 7, the developing unit 9 includes a developing frame 21, a driving side bearing 23, a conductive side bearing 24, a developing roller 6, a powder feeding roller, and a developing cover 27. The inside of the developing frame 21 is hollow, and the frame body surrounds a powder tank for storing the developer. The developing frame 21 is provided with the driving side bearing 23 and the conductive side bearing 24 at both ends in the length direction (Y1, Y2 direction), respectively. The powder feeding roller and the developing roller 6 are rotatably supported on the driving side bearing 23 and the conductive side bearing 24 at both ends in the length direction of the developing frame 21. The driving side bearing 23 is installed in the Y2 direction of the developing frame 21, and the conductive side bearing 24 is installed in the Y1 direction of the developing frame 21. The developing roller 6 is located on the Z2 direction side of the developing frame 21, and a developing roller gear is installed on the Y2 direction side of the developing roller 6. The developing roller gear is sleeved on the end of the shaft of the developing roller 6 that protrudes from the driving side bearing 23. The powder feeding roller is also located on the Z2 direction side of the developing frame 21, and a powder feeding roller gear is installed on the Y2 direction side of the powder feeding roller. The powder feeding roller gear is sleeved on the end of the shaft of the powder feeding roller that protrudes from the driving side bearing 23. The powder feeding roller can deliver the developer in the developing frame 21 to the developing roller 6. The developer absorbed by the developing roller 6 is transferred to the photosensitive drum 4 through the potential difference between the developing roller 6 and the photosensitive drum 4. The developer on the photosensitive drum 4 is transferred through the transfer belt 112a of the image forming device, and an image is formed on the recording material S (such as paper).

[0425] The developing cover 27 is a cover structure, and is detachably installed on the Y2 direction side of the drive-side bearing 23. The Y2 direction side of the developing cover 27 is provided with a cylindrical portion 270, which is a cylindrical structure protruding in the Y2 direction of the developing cover 27. The diameter of the cylindrical portion 270 is adapted to the diameter of the first rotating hole 131, i.e. the cylindrical portion 270 can be installed in the first rotating hole 131 to rotate. That is, the developing unit 9 can be connected to the drum unit 8 through the developing cover 27, and the developing unit 9 rotates around the rotating shaft of the first rotating hole 131, and is rotatably installed on the drum unit 8. The developing coupling 25 is rotatably arranged in the developing cover 27, and drives the developing roller gear and the powder feeding roller gear through the gear structure, and then drives the developing roller 6 and the powder feeding roller to rotate. The developing coupling 25 is exposed to the part of the first rotating hole 131 outside through the cylindrical portion 270, and can receive the driving force of the main assembly side developing driving coupling 185 of the image forming device.

[0426] Further, as shown in FIGS. 5 and 7, the process cartridge P further includes a first force receiving portion 271 (contact force receiving portion), a second force receiving portion 272 (separation force receiving portion, spacing force receiving portion), a first clamping portion 16, a second clamping portion 26, and a first elastic member 3, which are all used to move the developing unit 9 relative to the drum unit 8 between the developing position (contact position) and the spacing position (separation position). In the developing position (contact position), the developing roller 6 is in contact with the photosensitive drum 4, and is stably maintained in the contact state by the first elastic member 3 or the first clamping portion 16 and the second clamping portion 26. In the spacing position (separation position), the developing roller 6 (at least a part of it) is separated from the photosensitive drum 4, and is stably maintained in the separation state by the first clamping portion 16 and the second clamping portion 26.

[0427] Specifically, the first force receiving part 271 and the second force receiving part 272 are fixedly arranged on the developing cover 27 and the first force receiving part 271 is closer to the developing roller 6 or the photosensitive drum 4 than the second force receiving part 272 in the X1, X2 direction, and the first force receiving part 271 and the second force receiving part 272 are used to receive the force of the separation control component 196R to move the developing unit 9 relative to the drum unit 8 between the developing position and the interval position. Preferably, the first force receiving part 271 and the second force receiving part 272 are plate-shaped or block-shaped and arranged opposite to each other in parallel to the Z1, Z2 direction, and each of the first force receiving part 271 and the second force receiving part 272 has a force receiving surface, wherein the force receiving surface is a vertical plane to better receive the force of the separation control component 196R, and a recess (space) is formed between the first force receiving part 271 and the second force receiving part 272 to accommodate the control part 196R1 of the separation control component 196R; alternatively, the first force receiving part 271 and / or the second force receiving part 272 are plate-shaped or block-shaped and arranged opposite to each other and intersected with the Z1, Z2 direction, and each of the first force receiving part 271 and the second force receiving part 272 has a force receiving surface, wherein the force receiving surface is a plane to better receive the force of the separation control component 196R, and a recess (space) is formed between the first force receiving part 271 and the second force receiving part 272 to accommodate the control part 196R1 of the separation control component 196R. Alternatively, the first force receiving part 271 and the second force receiving part 272 can also be arranged on other positions of the developing unit 9, such as the developing frame 21 or the driving side bearing 23, as long as they can receive the force of the separation control component 196R.

[0428] Specifically, the first clamping part 16 and the second clamping part 26 are arranged on the drum frame 11 and the developing frame 21 respectively, and are used to stably hold the developing unit 9 in the interval position; the first elastic member 3 is preferably a tension spring, one end of which is connected with the conductive side end cover 14, and the other end of which is connected with the conductive side bearing 24, and is used to stably hold the developing unit 9 in the developing position; or the first elastic member 3 can be removed, and the first clamping part 16 and the second clamping part 26 are used to stably hold the developing unit 9 in the interval position or the developing position. It can be understood that the first clamping part 16 and the second clamping part 26 are holding parts (holding parts, holding components) that play a holding role.

[0429] Preferably, the first and second clamping portions 16 and 26 are integrally formed on the drum frame 11 and the developing frame 21 respectively, and are respectively a hook and a protrusion, which cooperate to form a clamping structure to stably clamp the developing unit 9 to keep it in the spaced position or the developing position. The hook and / or the protrusion can have a certain elastic deformation. Preferably, the first and second clamping portions 16 and 26 are fixedly supported by the drum frame 11 and the developing frame 21 respectively, i.e. the first and second clamping portions 16 and 26 are immovably arranged on the drum frame 11 or the developing frame 21, the first clamping portion 16 is arranged on the Y2 direction side and the Z1 direction side of the drum frame 11, and the second clamping portion 26 is correspondingly arranged on the Y2 direction side and the Z1 direction side of the developing frame 21. Alternatively, the first and second clamping portions 16 and 26 can also be an interference fit structure or a magnet structure, as long as they cooperate to form a stable clamping structure. Alternatively, the first and second clamping portions 16 and 26 can also be arranged at other positions of the drum unit 8 and the developing unit 9 respectively, for example, the first clamping portion 16 can also be arranged on the driving side end cover 13 and the conductive side end cover 14, and the second clamping portion 26 is correspondingly arranged on the developing cover 27 or the driving side bearing 23 and the conductive side bearing 24.

[0430] Referring to FIGS. 1-11, the working process of the present embodiment is as follows:

[0431] As shown in FIG. 5, during the transportation and storage stage before the use of the process cartridge P, the first and second clamping portions 16 and 26 are in a first position of mutual clamping, i.e. the process cartridge P is arranged to stably keep the developing unit 9 in the spaced position by the first and second clamping portions 16 and 26, at this time, the developing roller 6 is separated from the photosensitive drum 4 and is stably kept in the separated state by the first and second clamping portions 16 and 26. As shown in FIGS. 4 and 8, after the process cartridge P is inserted into the image forming device main assembly 502 along the X1 direction, the front door 111 is closed, and the tray 110 will take the process cartridge P to descend along the Z2 direction by a distance T1, so that a part (control part 196R1) of the separation control member 196R enters the recess (space) between the first and second force receiving portions 271 and 272, i.e. at least a part of the first and second force receiving portions 271 and 272 and at least a part of the separation control member 196R overlap in the vertical direction (Z1, Z2 direction). At this time, the developing roller 6 and the photosensitive drum 4 are still in the above-mentioned separated state, and the separation control member 196R is in an intermediate position (no force position), at which there is a gap between the first force applying surface 196a and the first force receiving portion 271, and there is also a gap between the second force applying surface 196b and the second force receiving portion 272, i.e. the separation control member 196R and the process cartridge P are in a non-contact state. It can be understood that the separation control member 196R is in the intermediate position when it is not controlled by the control mechanism.

[0432] As shown in FIG. 9 and FIG. 10, when the image forming apparatus 500 needs to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the force applying position in the W42 direction and apply force, at this time, the first force receiving portion 271 abuts against the first force applying surface 196a of the separation control member 196R, so that the first force receiving portion 271 receives the first acting force (contact force, as shown in FIG. 9) of the separation control member 196R, and the developing unit 9 rotates clockwise under the action of the first acting force and the first elastic member 3, so that the first clamping portion 16 and the second clamping portion 26 are disengaged from clamping and move to the second position of abutting against each other, so that the developing roller 6 and the photosensitive drum 4 are in contact and stably maintained in the contact state, and then the developing unit 9 is stably maintained in the developing position (as shown in FIG. 10) and the separation control member 196R returns to the intermediate position (non-force applying position). Alternatively, in the case where the first elastic member 3 is removed, the developing unit 9 can also rotate clockwise under the action of the first acting force and its own gravity, so that the developing roller 6 and the photosensitive drum 4 are in contact and stably maintained in the contact state after the first clamping portion 16 and the second clamping portion 26 are disengaged from clamping and become abutted against each other (i.e. the first clamping portion 16 and the second clamping portion 26 move from the first position to the second position), and then the developing unit 9 is stably maintained in the developing position.

[0433] As shown in FIG. 11, when the image forming apparatus 500 does not need to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the force applying position in the W41 direction and apply force, at this time, the second force receiving portion 272 abuts against the second force applying surface 196b of the separation control member 196R, so that the second force receiving portion 272 receives the second acting force (separation force) of the separation control member 196R to drive the developing unit 9 to rotate counterclockwise, so that the developing roller 6 and the photosensitive drum 4 are separated, and at the same time, the first clamping portion 16 and the second clamping portion 26 are re-clamped (i.e. the first clamping portion 16 and the second clamping portion 26 move from the second position to the first position), and the developing roller 6 and the photosensitive drum 4 are stably maintained in the separated state, and then the developing unit 9 is stably maintained in the interval position (as shown in FIG. 8) and the separation control member 196R returns to the intermediate position (non-force applying position).

[0434] Those skilled in the art can know that the developing unit 9 can also be fixed, and then the drum unit 8 is rotated to realize the separation and contact operation of the developing roller 6 and the photosensitive drum 4, which will not be described herein.

[0435] Embodiment Two

[0436] The embodiment provides another processing box P, which differs from the first embodiment in that the first clamping part 16 and the second clamping part 26 have different structures.

[0437] As shown in FIGS. 12-20, in the embodiment, the first clamping part 16 and the second clamping part 26 are arranged on the driving side end cover 13 and the developing cover 27 respectively, and are used to stably hold the developing unit 9 in the interval position; the first elastic member 3 is preferably a compression spring, one end of which is in abutment with the drum frame 11, and the other end of which is in abutment with the developing frame 21, and is used to stably hold the developing unit 9 in the developing position; or the first elastic member 3 can be removed, and the first clamping part 16 and the second clamping part 26 are used to stably hold the developing unit 9 in the interval position or the developing position. In the embodiment, the first clamping part 16 and the second clamping part 26 are integrally formed on the driving side end cover 13 and the developing cover 27 respectively. Specifically, referring to FIG. 15, the first clamping part 16 is arranged on the inner side (Y1 direction side) of the driving side end cover 13, and the first clamping part 16 is a long strip-shaped block on the driving side end cover 13, has a certain elasticity, and has a first acting surface 161 and a second acting surface 162 formed thereon, the first acting surface 161 and the second acting surface 162 are inclined surfaces inclined downward in the height direction (Z1, Z2 direction) of the processing box P, the slope of the first acting surface 161 is different from the slope of the second acting surface 162, the first acting surface 161 and the second acting surface 161 are connected to each other, and the first acting surface 161 is located on the X2 direction side of the second acting surface 162; in the height direction of the processing box P, the first acting surface 161 is located above (Z1 direction side) the second acting surface 162. Referring to FIG. 16, the second clamping part 26 is a protruding rib / protrusion formed on the developing cover 27, and is located on the X2 direction side of the developing cover 27.

[0438] Preferably, the first force receiving part 271 and the second force receiving part 272 of the embodiment are fixedly arranged on the driving side bearing 23 or the developing cover 27.

[0439] Referring to FIGS. 12-20, the working process of the embodiment is as follows:

[0440] Before the transport and storage stage before the use of the process cartridge P, the first and second engaging portions 16 and 26 are in the first position of abutting each other, at which the second engaging portion 26 abuts against the second acting surface 162 (as shown in Fig. 18), i.e. the process cartridge P is arranged to stably hold the developing unit 9 in the spaced position by the first and second engaging portions 16 and 26, at which the developing roller 6 is separated from the photosensitive drum 4 and is stably held in the separated state by the first and second engaging portions 16 and 26. After the process cartridge P is inserted into the image forming apparatus main assembly 502 in the X1 direction, the front door 111 is closed, and the tray 110 with the process cartridge P is lowered in the Z2 direction by a distance T1, so that a part (control portion 196R1) of the separation control member 196R enters the recess (space) between the first and second force receiving portions 271 and 272, i.e. at least a part of the first and second force receiving portions 271 and 272 overlaps at least a part of the separation control member 196R in the vertical direction (Z1, Z2 direction), at which the developing roller 6 and the photosensitive drum 4 are still in the above-mentioned separated state, and the separation control member 196R is in the intermediate position (non-force application position).

[0441] As shown in Figs. 19 and 20, when the image forming apparatus 500 needs to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the force application position in the W42 direction and apply the force, the first force receiving portion 271 abuts against the first force application surface 196a, so that the first force receiving portion 271 receives the first acting force (contact force) of the separation control member 196R, and the developing unit 9 rotates clockwise, so as to drive the second engaging portion 26 provided on the developing cover 27 to slide upward along the second acting surface 162 and then separate from the second acting surface 162, and the second engaging portion 26 moves to the second position of abutting against the first acting surface 161 (as shown in Fig. 20), at which the developing roller 6 and the photosensitive drum 4 are in contact and are stably held in the contact state by the second engaging portion 26 and the first acting surface 161 interacting with each other, and then the developing unit 9 is stably held in the developing position and the separation control member 196R returns to the intermediate position (non-force application position).

[0442] As shown in FIG. 17 and FIG. 18, after the image forming apparatus 500 does not need to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the force applying position in the W41 direction and apply force, the second force receiving portion 272 abuts against the second force applying surface 196b so that the second force receiving portion 272 receives the second acting force (separation force) of the separation control member 196R to drive the developing unit 9 to rotate counterclockwise, the second clamping portion 26 slides downward along the first acting surface 161 and then separates from the first acting surface 161, and then the second clamping portion 26 abuts against the second acting surface 162 again (i.e., the second clamping portion 26 moves from the second position to the first position, as shown in FIG. 18), at this time, the developing roller 6 separates from the photosensitive drum 4, and the two interact through the second clamping portion 26 and the second acting surface 162 to be stably kept in the separated state, after that, the developing unit 9 is stably kept in the interval position and the separation control member 196R returns to the intermediate position (non-force applying position).

[0443] The other structures of the process cartridge P of this embodiment are the same as those of Embodiment One, and will not be described herein.

[0444] Variation of Embodiment Two

[0445] This embodiment provides another process cartridge P, which is different from Embodiment Two in that the structures of the first clamping portion 16 and the second clamping portion 26 are different, and a second elastic member 3a is further provided.

[0446] As shown in FIG. 21, the first clamping portion 16 is formed on the driving side end cover 13, which includes a first acting portion 163 and a second acting portion 164. Specifically, in the present embodiment, the first acting portion 163 is a notch formed below the first rotating hole 131, the first acting portion 163 is recessed along the Y2 direction, and the second acting portion 164 is a protrusion formed below the first rotating hole 131, the second acting portion 164 is protruded along the Y1 direction. In the width direction (X1, X2 direction) of the process cartridge P, the first acting portion 163 is arranged adjacent to the second acting portion 164 and located at the X2 direction side of the second acting portion 164, that is, the first acting portion 163 is closer to the second rotating hole 132 / photoreceptor drum 4 than the second acting portion 164, the Y1 direction end surface of the second acting portion 164 can be arranged to have a guiding effect (for example, an arc surface, an inclined surface, etc.), and the side surface (X1 direction side surface) of the second acting portion 164 away from the first acting portion 163 can be arranged as a vertical surface. As shown in FIG. 22, the second clamping portion 26 is a protrusion formed on the developing guard cover 27, specifically, in the present embodiment, the second clamping portion 26 is a protrusion formed below the cylindrical portion 270, which is protruded along the Y2 direction on the developing guard cover 27, and the two sides of the second clamping portion 26 in the X direction can be arranged to have a guiding effect (for example, an arc surface, an inclined surface, etc.), or alternatively, the second clamping portion 26 can be a trapezoidal body shape. The second acting portion 164 and the second clamping portion 26 are arranged to have a guiding effect, which facilitates the relative movement when the two are in contact.

[0447] In addition, the second elastic member 3a of the present embodiment is sleeved on the conductive side bearing 24. As shown in FIG. 23 and FIG. 24, the conductive side bearing 24 is provided with a cylindrical mounting portion 241 protruding along the Y1 direction, the second elastic member 3a is sleeved on the mounting portion 241, and the conductive side end cover 14 is formed with a containing portion 141, which is an oval hole formed on the conductive side end cover 14, one end of which is open and the other end of which is closed. Specifically, the containing portion 141 is open on the side close to the conductive side bearing 24 and closed on the side away from the conductive side bearing 24. When the second elastic member 3a is sleeved on the mounting portion 241, it is contained in the containing portion 141, one end of which abuts against the conductive side bearing 24 and the other end of which abuts against the closed end of the containing portion 141, so that the conductive side bearing 24 can slide in the X axis direction and move in the Y axis direction in the containing portion 141, that is, the entire developing unit 9 can move in the axial direction (Y axis direction) of the developing roller 6 relative to the drum unit 8, and when the developing unit 9 moves in the Y1 direction, the second elastic member 3a is compressed and stored, that is, the second elastic member 3a is configured to exert an action force on the developing unit 9 to move it in the axial direction to the driving side (Y2 direction side).

[0448] Referring to FIG. 21 to FIG. 26, the working process of the present embodiment is as follows:

[0449] During the transportation and storage stage before the use of the process cartridge P, the second engaging portion 26 is in the first position (as shown in FIG. 25) in which it abuts against the side surface of the second acting portion 164 in the X1 direction, i.e. the process cartridge P is arranged to stably hold the developing unit 9 in the spaced position by the first and second engaging portions 16 and 26, at this time the developing roller 6 is separated from the photosensitive drum 4 and is stably held in the separated state by the first and second engaging portions 16 and 26. After the process cartridge P is inserted into the image forming apparatus main assembly 502 in the X1 direction, the front door 111 is closed and the tray 110 is lowered by a distance T1 in the Z2 direction with the process cartridge P, so that a part (control portion 196R1) of the separation control member 196R enters the recess (space) between the first and second force receiving portions 271 and 272, i.e. at least a part of the first and second force receiving portions 271 and 272 overlaps at least a part of the separation control member 196R in the vertical direction (Z1, Z2 direction), at this time the developing roller 6 is still in the above-mentioned separated state and the separation control member 196R is in the intermediate position (non-force application position).

[0450] As shown in FIG. 25, when the image forming apparatus 500 needs to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the force application position in the W42 direction and apply a force, the first force receiving portion 271 abuts against the first force application surface 196a, so that the first force receiving portion 271 receives the first acting force (contact force) of the separation control member 196R, the developing unit 9 rotates clockwise, the second engaging portion 26 moves in the X2 direction along the Y1 direction of the second acting portion 164 under the guidance of the inclined surface / arc surface, and the pushing action of the second acting portion 164 on the second engaging portion 26 moves the developing unit 9 as a whole in the Y1 direction, the second elastic member 3a is compressed to store a force, when the second engaging portion 26 completely passes the second acting portion 164 in the X2 direction (the second engaging portion 26 is separated from the second acting portion 164) to reach the second position (as shown in FIG. 26) in which it cooperates with the first acting portion 163, the pushing force of the second acting portion 164 on the second engaging portion 26 disappears, the developing unit 9 moves as a whole in the Y2 direction under the action of the second elastic member 3a, and the second engaging portion 26 at least partially enters the first acting portion 163, at this time the developing roller 6 and the photosensitive drum 4 are in contact and are stably held in the contact state by the second engaging portion 26 and the first acting portion 163, after that, the developing unit 9 is stably held in the developing position and the separation control member 196R returns to the intermediate position (non-force application position).

[0451] When the image forming apparatus 500 does not need to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the force application position in the W41 direction and apply force, the second force receiving portion 272 abuts against the second force application surface 196b so that the second force receiving portion 272 receives the second acting force (separation force) of the separation control member 196R to drive the developing unit 9 to rotate counterclockwise, the second clamping portion 26 moves in the X1 direction along the Y1 direction end of the second acting portion 164 under the guidance of the inclined surface / arc surface, and the developing unit 9 as a whole moves in the Y1 direction, the second elastic member 3a is compressed to store force, when the second clamping portion completely passes the Y1 direction end of the second acting portion 164 in the X1 direction, the developing unit 9 as a whole moves in the Y2 direction under the action of the second elastic member 3a, so that the second clamping portion 26 abuts against the side surface of the second acting portion 164 in the X1 direction again (i.e., the second clamping portion 26 moves from the second position to the first position, as shown in FIG. 25), at this time, the developing roller 6 is separated from the photosensitive drum 4, and the two interact through the second clamping portion 26 and the second acting portion 164, so as to be stably kept in the separated state, after that, the developing unit 9 is stably kept in the interval position and the separation control member 196R returns to the intermediate position (no force application position).

[0452] The other structures of the process cartridge P of the present embodiment are the same as those of Embodiment Two, and will not be described herein.

[0453] Embodiment Three

[0454] The present embodiment provides another process cartridge P, which is different from Embodiment Two in that the structures of the first clamping portion 16 and the second clamping portion 26 are different.

[0455] As shown in Fig. 27, the first clamping portion 16 is formed on the driving side end cover 13, which includes a first acting portion 163 and a second acting portion 164. Specifically, in the present embodiment, the first acting portion 163 is an inclined groove formed on the first rotating hole 131, which is recessed inwardly along the radial direction of the first rotating hole 131 and extends obliquely along the circumferential direction of the first rotating hole 131, and the first acting portion 163 is located on the upstream side of the end portion thereof away from the conductive side (Y2 direction end) in the clockwise direction, with the end portion thereof close to the conductive side (Y1 direction end). The second acting portion 164 is a protrusion formed on the first acting portion 163, which protrudes outwardly from any one side of the first acting portion 163, and the second acting portion 164 separates the first acting portion 163 into two regions, including a first region on the Y1 direction side of the second acting portion 164 and a second region on the Y2 direction side of the second acting portion 164. Preferably, the first clamping portion 16 can be provided with multiple, and two is provided in the present embodiment, and the two first clamping portions 16 are symmetrically arranged along the rotation axis of the first rotating hole 131. As shown in Fig. 28, the second clamping portion 26 is an inclined protrusion formed on the developing cover 27, which protrudes outwardly along the radial direction of the cylindrical portion 270 of the developing cover 27 and extends obliquely along the circumferential direction of the cylindrical portion 270 of the developing cover 27, and the second clamping portion 26 is capable of being embedded into the first clamping portion 16 and moving relative to the first clamping portion 16, and the number and position of the second clamping portion 26 are adapted to the first clamping portion 16, and two is provided in the present embodiment, and the two second clamping portions 26 are symmetrically arranged along the rotation axis of the cylindrical portion 270.

[0456] In addition, in the present embodiment, the gap between the developing unit 9 and the driving side end cover 13 and the conductive side end cover 14 is enlarged, so that the developing unit 9 can move in the Y axis direction.

[0457] Referring to Figs. 27 to 30, the working process of the present embodiment is as follows:

[0458] Before the transport and storage stage before the use of the process cartridge P, the second engaging portion 26 is in the first position in which it is in abutment with the first region of the first acting portion 163 of the first engaging portion 16 and the Y1 direction side of the second acting portion 164 (as shown in Fig. 30), i.e. the process cartridge P is arranged to stably hold the developing unit 9 in the spaced position by the abutment of the first engaging portion 16 and the second engaging portion 26, at this time the developing roller 6 is separated from the photosensitive drum 4 and is stably held in the separated state by the first engaging portion 16 and the second engaging portion 26, the developing unit 9 is in the position close to the conductive side (Y1 direction side), and the second elastic member 3a (arranged between the conductive side end cover 14 and the conductive side bearing 24) is in the compressed state. After the process cartridge P is inserted into the image forming apparatus main assembly 502 in the X1 direction, the front door 111 is closed, and the tray 110 is lowered by a distance T1 in the Z2 direction with the process cartridge P, so that a part (control portion 196R1) of the separation control member 196R enters the recess (space) between the first force receiving portion 271 and the second force receiving portion 272, i.e. at least a part of the first force receiving portion 271 and the second force receiving portion 272 overlaps at least a part of the separation control member 196R in the vertical direction (Z1, Z2 direction), at this time, the developing roller 6 and the photosensitive drum 4 are still in the above-mentioned separated state, and the separation control member 196R is in the intermediate position (non-force application position).

[0459] As shown in Fig. 29, when the image forming apparatus 500 needs to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the force application position in the W42 direction and apply force, the first force receiving portion 271 abuts against the first force application surface 196a, so that the first force receiving portion 271 receives the first acting force (contact force) of the separation control member 196R, and the developing unit 9 rotates clockwise under the action of the first acting force, so as to drive the second engaging portion 26 arranged on the developing cover 27 to move relative to the second acting portion 164, the second engaging portion 26 moves from the first region of the first acting portion 163 to the second region of the first acting portion 163 and abuts against the Y2 direction side of the second acting portion 164, i.e. moves to the second position, in the process, the second elastic member 3a deforms and recovers, and the developing unit 9 as a whole moves in the Y2 direction. When the second engaging portion 26 moves to the second position, the developing roller 6 and the photosensitive drum 4 are in contact, and are stably held in the contact state by the interaction of the first engaging portion 16 and the second engaging portion 26, thereafter, the developing unit 9 is stably held in the developing position and the separation control member 196R returns to the intermediate position (non-force application position).

[0460] As shown in FIG. 30, after the image forming apparatus 500 does not need to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the force application position in the W41 direction and apply force, the second force receiving portion 272 abuts against the second force application surface 196b so that the second force receiving portion 272 receives the second acting force (separation force) of the separation control member 196R to drive the developing unit 9 to rotate counterclockwise, the second latching portion 26 passes the second acting portion 164 from the first acting portion 163 to the first region of the first acting portion 163 and abuts against the Y1 direction side of the second acting portion 164 again (i.e., the second latching portion 26 moves from the second position to the first position), in the process, the developing unit 9 as a whole moves in the Y1 direction, and the second elastic member 3a is compressed. When the second latching portion 26 moves to the first position, the developing roller 6 is separated from the photosensitive drum 4, and the two interact through the second latching portion 26 and the second acting portion 164, so as to be stably kept in the separated state, after that, the developing unit 9 is stably kept in the interval position and the separation control member 196R returns to the intermediate position (no force application position).

[0461] The other structure of the process cartridge P of the present embodiment is the same as that of Embodiment Two, and will not be described herein.

[0462] Embodiment Four

[0463] The present embodiment provides another process cartridge P, which is different from Embodiment Three in that the structure of the driving side end cover 13 is different.

[0464] As shown in FIGS. 31 and 32, the drive-side end cover 13 is provided with a second through-hole 132 and a first notch portion 133, when the drive-side end cover 13 is installed at the end of the drum frame 11 and the developing frame 21, a part of the drum coupling 15 is exposed through the second through-hole 132, and a part of the developing coupling 25 is exposed through the first notch portion 133 after passing through the cylindrical portion 270 of the developing cover 27, so as to engage with the main assembly side driving coupling of the image forming apparatus to receive driving force. The first notch portion 133 extends upward and rearward from the position corresponding to the developing coupling 25 to the upper end and the rear end of the drive-side end cover 13, and can also extend only upward to the upper end of the drive-side end cover 13 or only rearward to the rear end of the drive-side end cover 13, that is, a hollow portion is formed on the drive-side end cover 13, so that the projection of the first notch portion 133 on the length direction of the process cartridge (also the axial direction of the developing roller) is greater than the projection of the developing coupling 25 on the length direction; most of the developing cover 27 is exposed through the first notch portion 133, and after the developing cover 27 is removed, the developing coupling 25 is completely exposed through the first notch portion 133, and the structure inside the process cartridge P (especially the internal structure of the developing unit 9) can be observed to a certain extent through the first notch portion 133, and in the case of local maintenance, the drive-side end cover 13 does not need to be removed, and the maintenance is more convenient. After the drive-side end cover 13 is installed in place, at least a part of the developing coupling 25 and the developing cover 27 (specifically the cylindrical portion 270) protrudes from the first notch portion 133 of the drive-side end cover 13 and protrudes from the surface of the drive-side end cover 13 (the surface of the end in the Y2 direction), and the drive-side end cover 13 does not contact the cylindrical portion 270, that is, the cylindrical portion 270 is completely located in the range of the first notch portion 133.

[0465] As shown in FIGS. 31 and 32, in the width direction, the first notch portion 133 is located on the rear side (X1 direction side) of the rotation shaft N of the drum coupling 15, and in the height direction (vertical direction), the first notch portion 133 is located on the upper side (Z1 direction side) of the rotation shaft N of the drum coupling 15.

[0466] As shown in FIGS. 31 and 32, the first clamping portion 16 is an inclined groove as in Embodiment Three, the first clamping portion 16 is recessed radially inward from the edge of the first notch portion 133 and extends in the circumferential direction, and the first clamping portion 16 can be provided in multiple, for example, on the front side and / or the lower side of the first notch portion 133. The second clamping portion 26 is an inclined protrusion provided on the cylindrical portion 270, and the number and position of the second clamping portion 26 are matched with the first clamping portion.

[0467] As shown in FIGS. 31 and 32, the drive-side end cover 13 is further provided with a shielding area 134, which is located at the Z2-direction end of the drive-side end cover 13 in the vertical direction (Z1, Z2 direction), i.e. the shielding area 134 is located at the lower end of the drive-side end cover 13, and is located at the lower side (Z2 direction side) of the first notch portion 133 and at the rear side (X1 direction side) of the rotation shaft N of the photosensitive drum 4. A straight line K1 passing through the rotation shaft N of the photosensitive drum 4 and a straight line K2 passing through the rotation shaft (not shown) of the developing roller 6 are drawn in the width direction (X1, X2 direction) respectively, and the shielding area 134 and the first notch portion 133 are located at two sides of the straight line K1 or the straight line K2 respectively. As shown in FIG. 31, when the process cartridge P is arranged in the state that the photosensitive drum 4 and the developing roller 6 contact each other, and the straight line K1 is located below the straight line K2 as viewed along the rotation shaft N of the photosensitive drum 4, at least a part of the shielding area 134 is located at the lower end of the drive-side end cover 13 in the vertical direction (Z1, Z2 direction), or at least a part of the shielding area 134 is located below the first force receiving portion 271 and the second force receiving portion 272 (as shown in FIG. 31), i.e. the first force receiving portion 271 and the second force receiving portion 272 do not protrude above the lower end of the shielding area 134 in the Z2 direction, in other words, the first force receiving portion 271 and the second force receiving portion 272 are shielded by the shielding area 134 and are not exposed. At this time, the shielding area 134 is located at a shielding position, so that when the process cartridge P is placed on a table, the lower end of the shielding area 134 will contact the table before the first force receiving portion 271 and the second force receiving portion 272, or when the process cartridge P is collided during transportation, the shielding area 134 can protect the first force receiving portion 271 and the second force receiving portion 272, and the first force receiving portion 271 and the second force receiving portion 272 can also be protected correspondingly; especially, in the length direction (Y1, Y2 direction), the drive-side end cover 13 is located at the outer side (Y2 direction side) of the first force receiving portion 271 and the second force receiving portion 272, i.e. the shielding area 134 is farther away from the developing frame 21 than the first force receiving portion 271 and the second force receiving portion 272, so that when the process cartridge P is collided in the length direction, the first force receiving portion 271 and the second force receiving portion 272 can be more effectively protected by the shielding area 134.

[0468] Example Five

[0469] This embodiment provides another process cartridge P, which differs from the process cartridge P of Example Four in that the structure of the developing cover 27 is different.

[0470] As shown in FIG. 33 and FIG. 34, the driving side end cover 13 is still provided with the second through hole 132, the first notch part 133 and the shielding area 134. The outer side (Y2 direction) of the driving side bearing 23 is provided with a positioning part 231, and the developing coupling 25 is sleeved on the positioning part 231. The positioning part 231 is a cylindrical structure protruding along the Y2 direction on the driving side bearing 23, and the developing coupling 25 includes a gear part 251, a driving force receiving part 252 and a hollow part. The inner diameter of the hollow part is matched with the outer diameter of the positioning part 231, the developing coupling 25 is sleeved on the outer side of the positioning part 231 (cylindrical structure) through the hollow part, the driving force receiving part 252 is arranged at one end of the hollow part away from the driving side bearing 23, and the driving force receiving part 252 can be a triangular protrusion for engaging with the main assembly side developing drive coupling 185 of the image forming device to receive driving force; the gear part 251 is arranged on the outer circumferential surface of the hollow part, and the gear part 251 can be a two-stage gear, wherein one stage gear engages with the developing roller gear 60, and the other stage gear engages with the powder feeding roller gear 70 to transmit the received driving force to the developing roller 6 and the powder feeding roller respectively.

[0471] As shown in FIG. 33 and FIG. 34, the developing cover 27 is arranged on the outer side (Y2 direction) of the driving side bearing 23 and the inner side (Y1 direction) of the driving side end cover 13, and the developing cover 27 covers the developing roller gear 60, the powder feeding roller gear 70 and part of the developing coupling 25, which can play a protective role. Specifically, the developing cover 27 can cover part of the lower side or the front lower side (X2, Z2 direction) of the gear part 251 of the developing coupling 25, and the upper side or the rear upper side (X1, Z1 direction) of the developing cover 27 is provided with a second notch part 273, that is, the developing cover 27 does not cover the upper side or the rear upper side of the gear part 251 of the developing coupling 25, in other words, the upper side or the rear upper side of the gear part 251 of the developing coupling 25 is exposed through the second notch part 273. It should be noted that the developing cover 27 only plays a shielding and protecting role for the developing coupling 25, and there is no supporting contact part between the two, so the developing cover 27 does not have the role of supporting the developing coupling 25, and the developing coupling 25 is completely supported by the positioning part 231 of the driving side bearing 23. Alternatively, the shielding area 134 on the driving side end cover 13 can also be arranged on the developing cover 27 or the driving side bearing 23 or the developing frame 21, as long as it can play the same shielding and protecting role for the first force receiving part 271 and the second force receiving part 272.

[0472] Embodiment six

[0473] Chinese patent application CN113574468A discloses a processing cartridge, including a holding part, the holding part is rotatably supported by a developing unit, and can move between a first position for stably holding the developing unit (second unit) at a spaced position by a drum unit (first unit) and a second position for stably holding the developing unit at a developing position by the drum unit; and a first force receiving part (contact force receiving part) and a second force receiving part (separation force receiving part, spacing force receiving part), the contact force receiving part can receive a contact force for moving the holding part from the first position to the second position to move the developing unit to the developing position when the developing unit is in the spaced position. The first force receiving part and the second force receiving part are oppositely arranged on the processing cartridge, and a space is formed therebetween.

[0474] The processing cartridge with such a structure is relatively movable with respect to the developing unit, and the position of the holding part with respect to the developing unit is prone to misalignment. The first force receiving part cannot stably transmit the acting force to the holding part, thereby affecting the normal operation of the processing cartridge. The first force receiving part and the second force receiving part are arranged on two components respectively, the structure is relatively complex, and the manufacturing cost is high.

[0475] To solve the above problems, with reference to FIGS. 35-40, the embodiment provides a processing cartridge, including a drum unit 8, a developing unit 9, a force receiving piece 31, a holding part, and a third elastic piece 33. Only the differences are described below.

[0476] With reference to FIG. 36, the force receiving piece 31 is fixedly arranged on the developing cover 27. The force receiving piece 31 is a protruding structure protruding in the Z2 direction. The Z2 direction end of the force receiving piece 31 is provided with a bent section 274 extending towards the X1, Z2 direction. The force receiving piece 31 is provided with a first force receiving part 271 and a second force receiving part 272. The first force receiving part 271 is the surface of the force receiving piece 31 facing the X1 direction, and the second force receiving part 272 is the surface of the force receiving piece 31 facing the X2 direction. The force receiving piece 31 is also provided with a guide inclined surface 275. The guide inclined surface 275 is arranged on the Y2 direction side of the first force receiving part 271, and is also arranged on the Y2 direction side of the bent section 274. The guide inclined surface 275 is inclined towards the drum unit 8, and is used for guiding the separation control part 196R to separate from the first force receiving part 271.

[0477] In this embodiment, referring to Figs. 37 and 38, the developing unit 9 is arranged to be movable relative to the drum unit 8 in the Y1 and Y2 directions (the developing coupling 25 also moves together), and a third elastic member 33 is arranged at the conductive end (Y1 direction end) of the process cartridge, and the third elastic member 33 is used to provide a force in the Y2 direction in the axial direction to the developing unit 9 to move the developing unit 9 in the Y2 direction (i.e. move towards the driving end). Specifically, the conductive side bearing 24 is provided with a mounting groove 243 recessed in the Y2 direction to form a containing space, and the third elastic member 33 is contained in the mounting groove 243, and the conductive side end cover 14 is provided with an abutting protrusion 143 capable of extending into the mounting groove 243 to abut against the third elastic member 33 and push the third elastic member 33 to deform to generate a force in the Y2 direction acting on the entire developing unit 9, and when the developing unit 9 moves in the Y1 direction, the third elastic member 33 is further compressed and deformed. The third elastic member 33 in this embodiment is preferably a compression spring, and can also be other elastic components such as elastic rubber, elastic sponge, spring sheet, etc.

[0478] Referring to Figs. 35, 39 and 40, the retaining portion includes a first clamping portion 16 and a second clamping portion 26, the first clamping portion 16 is arranged on the drum frame 11, and the second clamping portion 26 is arranged on the developing frame 21. Specifically, the first clamping portion 16 is a protrusion arranged at the X1, Z1 direction side of the drum frame 11 and protruding in the X1 direction (i.e. extending in the direction towards the developing unit 9), and the Y1 direction side surface of the first clamping portion 16 is provided with a first positioning portion 165 and a second positioning portion 166, both of which are V-shaped grooves recessed in the Y2 direction and adjacent to each other in the X axis direction, the first positioning portion 165 is located at the X2 direction side, and the second positioning portion 166 is located at the X1 direction side, the first positioning portion 165 includes a first surface 1651 and a second surface 1652 connected to each other, the second positioning portion 166 includes a third surface 1661 and a fourth surface 1662 connected to each other, and the first surface 1651, the second surface 1652, the third surface 1661 and the fourth surface 1662 are sequentially connected in the X1 direction. The connection between the second surface 1652 and the third surface 1661 is a first apex 1653, and the first apex 1653 is closer to the driving end than the end portion (Y1 direction end) of the first surface 1651.

[0479] Referring to Fig. 40, the X2, Z1 direction side of the developing frame 21 is provided with a recess 211 recessed from the X2 direction side of the developing frame 21 toward the X1 direction, and the recess 211 is opposite to the first engaging portion 16 (the protrusion) which can be inserted into the recess 211, the width of the recess 211 in the Y axis direction is greater than the width of the protrusion in the Y axis direction, so that the protrusion can relatively move along the Y axis direction in the recess 211. The Y1 direction side of the recess 211 is provided with the second engaging portion 26, the second engaging portion 26 is a protruding structure, protruding along the Y2 direction, and has a shape capable of cooperating with the first positioning portion 165 and the second positioning portion 166, and the second engaging portion 26 is generally a triangular prism structure capable of cooperating with the V-shaped groove.

[0480] When the developing unit 9 moves relative to the drum unit 8 between the developing position and the interval position, the second engaging portion 26 also moves between the first positioning portion 165 and the second positioning portion 166 and abuts against the first positioning portion 165 or the second positioning portion 166, so that the developing unit 9 is kept in the developing position or the interval position. The force of the third elastic member 33 can stably abut the second engaging portion 26 against the first positioning portion 165 or the second positioning portion 166.

[0481] Referring to Figs. 41-42, when the process cartridge is in the state of the developing position and is loaded into the image forming apparatus 500, the separation control member 196R is in the intermediate position (i.e. the non-force applying position), at this time, the second engaging portion 26 on the developing unit 9 is abutted against the second positioning portion 166 of the first engaging portion on the drum unit 8 by the third elastic member 33 of the conductive end (the second engaging portion 26 is inserted into the second positioning portion 166 and abutted against the third surface 1661 and the fourth surface 1662), and under the action of the third elastic member 33 toward the Y1 direction, the second engaging portion 26 is stably abutted in the second positioning portion 166, so that the developing unit 9 is kept in the developing position.

[0482] Referring to Figs. 43-44, when the image forming apparatus 500 issues a separation instruction, the separation control member 196R moves toward the W41 direction (the X1 direction) and abuts against the second force receiving portion 272 of the force receiving member 31, pushes it to move toward the W41 direction, gives the developing unit 9 a force, so that the developing unit 9 rotates counterclockwise (counterclockwise when viewed along the Y1 direction), the second engaging portion 26 slides along the third surface 1661 with the movement of the developing unit 9, so that the entire developing unit 9 compresses the third elastic member 33 to retreat a certain distance in the axial direction (moves along the Y1 direction), until the second engaging portion 26 abuts against the first vertex 1653 intersecting the second positioning portion 166 and the first positioning portion 165.

[0483] Referring to Figs. 45-46, the separation control member 196R continues to move in the direction of W41, the developing unit 9 continues to rotate counterclockwise to abut against the first surface 1651 of the first positioning portion 165, and continues to slide along the first surface 1651 (to the end of the first surface 1651 near the conductive end), so that the developing unit 9 retreats in the axial direction by a certain distance (moves in the direction of Y1), at this time, the force receiving member 31 reaches a position where the second force receiving portion 272 is disengaged from the abutment of the separation control member 196R (i.e., the second force receiving portion 272 no longer receives the separation force) with the axial movement of the developing unit 9, the separation control member 196R continues to move in the direction of W41 beyond the force receiving member 31 to the X1 direction side of the first force receiving portion 271, and the force receiving member 31 stops receiving the force (separation force) of the separation control member 196.

[0484] Subsequently, referring to Figs. 45 and 48, the third elastic member 33 recovers from deformation, so that the developing unit 9 moves in the axial direction toward the driving end (moves in the direction of Y2), so that the second clamping portion 26 enters the first positioning portion 165 in the direction of Y2 to abut against the first positioning portion 165, at this time, the developing unit 9 is in the separation position, the photosensitive drum 4 is separated from the developing roller 6, and the second clamping portion 26 stably abuts against the first surface 1651 and the second surface 1652 by the axial force of the third elastic member 33, and the developing unit 9 is kept in the separation position. The separation control member 196R moves in the direction of W42 to return to the intermediate position, but the separation control member 196R cannot move in the direction of W42 because it is abutted against the force receiving member 31.

[0485] Referring to Figs. 45-46, when the image forming apparatus 500 needs to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move in the direction of W42 to abut against the first force receiving portion 271 of the force receiving member 31, and push it to move in the direction of W42, so as to give the developing unit 9 a force to rotate clockwise, the second clamping portion 26 slides along the second surface 1652 with the movement of the developing unit 9, so that the entire developing unit 9 compresses the third elastic member 33 to retreat in the axial direction by a certain distance (moves in the direction of Y1), until the second clamping portion 26 disengages from the first positioning portion 165 to abut against the first vertex 1653 where the first positioning portion 165 and the second positioning portion 166 intersect, and then passes the first vertex 1653 in the direction of X1, at this time, the separation control member 196R continues to abut against the bent section 274 of the force receiving member 31.

[0486] Referring to FIGS. 42 and 47, when the separation control member 196R continues to move in the W42 direction, the separation control member 196R will disengage from the force receiving member 31 through the guide slope 275 provided on the force receiving member 31. At this time, the separation control member 196R is located on the W42 direction side of the force receiving member 31, the force receiving member 31 stops receiving the contact force, and the third elastic member 33 deforms to recover, causing the developing unit 9 to move axially (in the Y2 direction) toward the driving end, so that the second clamping portion 26 enters the second positioning portion 166 in the Y2 direction and abuts against the second positioning portion 166. At this time, the developing unit 9 is in the developing position, the photosensitive drum 4 is in contact with the developing roller 6, and the second clamping portion 26 stably abuts against the third surface 1661 and the fourth surface 1662 through the axial force of the third elastic member 33, and the developing unit 9 is kept in the developing position.

[0487] In this embodiment, by providing the fixed retaining portion, the axially movable developing unit 9, and the force receiving member 31, the developing unit 9 is axially moved and rotated through the interaction between the force receiving member 31 and the separation control member 196R, and cooperates with the retaining portion to realize the contact and separation of the developing roller 6 and the photosensitive drum 4.

[0488] In this embodiment, as the developing unit 9 moves inwardly in the Y1 direction, the developing coupling 25 can disengage from the main assembly side developing drive coupling 185 and not receive driving force, so as not to drive the developing roller 6 and the powder feeding roller to rotate. However, the developing coupling 25 and the main assembly side developing drive coupling 185 cannot disengage, and the main assembly side developing drive coupling 185 is also moved in the Y1 direction, which will cause damage to the main assembly side developing drive coupling 185.

[0489] Referring to Figs. 49-50, the process cartridge of the present embodiment is further provided with a blocking member 17 for preventing the main assembly side developing drive coupling member 185 from being moved to the conductive end when the developing unit 9 is moved to the conductive end in the axial direction. The blocking member 17 is an axially protruding annular member provided on the first through hole 131 of the drive side end cover 13 on the side away from the developing frame 21 (the side in the Y2 direction), and the first through hole 131 on the side away from the developing frame 21 is provided with a first annular protrusion 1311 extending from the inner wall of the first through hole 131 to the axial center, and the inner wall of the first annular protrusion 1311 is provided with a clamping annular protrusion 1312, and the blocking member 17 is clamped with the clamping annular protrusion 1312 to be mounted on the drive side end cover 13, and the circumferential surface of the blocking member 17 is provided with a clamping annular groove 171 matched with the clamping annular protrusion 1312, and the blocking member 17 is further provided with an annular blocking protrusion 172, and the inside of the blocking protrusion 172 forms a third through hole 173, and when assembled, the engaging portion of the developing coupling 25 can be exposed from the third through hole 173 to be engaged with the main assembly side developing drive coupling member 185. When the developing unit 9 is moved to the Y1 direction to move the developing coupling 25 to the Y1 direction, the main assembly side developing drive coupling member 185 will abut against the Y2 direction side surface of the blocking protrusion 172 on the blocking member 17 to be limited, so that the main assembly side developing drive coupling member 185 cannot continue to move to the Y1 direction, i.e. cannot be continuously moved to the conductive end by the developing coupling 25, and the main assembly side developing drive coupling member 185 can be prevented from being damaged. Preferably, the distance between the side surface of the blocking protrusion 172 and the outside surface of the developing coupling 25 is between 0.5mm and 1.5mm when measured in the axial direction before the developing unit 9 is moved to the Y1 direction under force. The blocking member 17 and the drive side end cover 13 can be integrally injection molded or can be mounted and cooperated as separate parts.

[0490] The other structures of the process cartridge of the present embodiment can be the same as those of any one of the above embodiments, and will not be described herein.

[0491] Embodiment Seven

[0492] In the prior art, in order to realize the two states of the photosensitive drum and the developing roller being separated when not working and being in contact when working, a force receiving member is generally provided on the developing unit, which receives the contact force of the image forming apparatus to move the developing unit to the developing position and receives the separation force of the image forming apparatus to move the developing unit to the spaced position, or two force receiving members are provided on the developing unit, one of which receives the contact force to move the developing unit to the developing position, and the other of which receives the separation force to move the developing unit to the spaced position.

[0493] The prior art has the following problems: only one force receiving member is provided, which receives both the contact force and the separation force, and moving between the two positions will make the force receiving member frequently stressed and more likely to wear out, and the problem of insufficient stress to move the developing unit from the developing position to the interval position or from the interval position to the developing position. While providing two force receiving members, the process cartridge structure is relatively complex, and in order to meet the high precision requirements of the image forming device for the time and stability of the separation and contact of the developing roller and the photosensitive drum, the precision, material strength and matching tolerance of each part are required to be high, otherwise the developing quality of the process cartridge will be affected, and the miniaturization of the process cartridge is not conducive.

[0494] The embodiment provides a process cartridge, compared with the sixth embodiment, the difference lies in that the first clamping part, the second clamping part and the force receiving member are different in structure, and the first clamping part and the second clamping part of the embodiment do not keep the developing unit 9 in the interval position.

[0495] Referring to FIGS. 51-53, in the embodiment, the first clamping part 16 is provided on the driving side end cover 13, and the second clamping part 26 is provided on the developing cover 27. The first clamping part 16 is a groove provided on the inner wall of the first rotating hole 131, the groove penetrates the driving side end cover 13 along the Y axis direction, the groove can be a slant groove or a spiral groove (inclined relative to the Y axis direction), and the opposite sides of the groove in the circumferential direction of the first rotating hole 131 are respectively the first guide surface 167 and the second guide surface 168, the first guide surface 167 and the second guide surface 168 are inclined surfaces or spiral surfaces. When viewed in the Y1 direction, the first guide surface 167 is located on the upstream side of the second guide surface 168 in the clockwise direction. In the clockwise direction, the end of the first guide surface 167 close to the conductive end (Y1 direction end) is located on the upstream side of the end of the first guide surface 167 away from the conductive end (Y2 direction end). Similarly, in the clockwise direction, the end of the second guide surface 168 close to the conductive end (Y1 direction end) is also located on the upstream side of the end of the second guide surface 168 away from the conductive end (Y2 direction end).

[0496] Referring to Figs. 51-53, the second engaging portion 26 is a protrusion provided on the outer circumferential wall of the cylindrical portion 270 of the developing cover 27, and has a shape adapted to the first engaging portion 16, i.e. the second engaging portion 26 is a protrusion extending obliquely or spirally with respect to the Y-axis direction, and the two side faces of the second engaging portion 26 in the circumferential direction of the cylindrical portion 270 are respectively a first guided face 261 and a second guided face 262. When assembled, the second engaging portion 26 is inserted into the first engaging portion 16, and the first guiding face 167 abuts against the first guided face 261, or the second guiding face 168 abuts against the second guided face 262. Through the cooperation of the first engaging portion 16 and the second engaging portion 26, the developing unit 9 is allowed to rotate between the spaced position (separated position) and the developing position (contact position) while having an axial movement (moving along the Y-axis direction), i.e. the first engaging portion 16 and the second engaging portion 26 have a guiding effect on the movement of the developing unit 9, and the developing coupling 25 in the developing unit 9 also moves along the Y-axis direction together.

[0497] The number of the first engaging portion 16 and the second engaging portion 26 can be multiple, and the multiple first engaging portions 16 and the second engaging portions 26 are arranged at intervals in the circumferential direction. In the present embodiment, the number of the first engaging portion 16 and the second engaging portion 26 is two, and the two first engaging portions 16 and the two second engaging portions 26 are arranged symmetrically with respect to the center.

[0498] Referring to Fig. 59, the present embodiment also has the blocking member 17 as in Embodiment 6, which is located on the side of the first rotating hole 131 away from the developing frame 21, and in the Y direction, the blocking member 17 is farther away from the developing frame 21 than the first guiding face 167 and the second guiding face 168.

[0499] Referring to Fig. 54, when the process cartridge is in the developing position and is loaded into the image forming apparatus 500, the separation control member 196R is in the intermediate position (i.e. the non-force applying position), at this time, the separation control member 196R does not contact the force receiving member 31, and the developing unit 9 is kept in the developing position by the abutment of the first guided face 261 of the second engaging portion 26 on the developing cover 27 against the first guiding face 167 of the first engaging portion 16 on the driving side end cover 13 through the force of the third elastic member 33 provided on the electrically conductive end.

[0500] Referring to Figs. 53 and 55, when the image forming apparatus 500 issues a separation instruction, the separation control member 196R moves in the W41 direction (the X1 direction) to abut against the second force receiving portion 272 of the force receiving member 31 (the second force receiving portion 272 is a separation force receiving surface 272a in a vertical state or with a certain inclination angle on the force receiving member 31 for abutting in the X1 direction, the separation force receiving surface 272a is disposed toward the drum unit 8, the separation force receiving surface 272a is parallel to the first direction and perpendicular to the plane constituted by the first direction and the second direction (i.e., the separation force receiving surface 272a is a vertical surface), or the separation force receiving surface 272a intersects the first direction, i.e., has a certain inclination angle with respect to the first direction (i.e., the separation force receiving surface 272a is an inclined surface)), and pushes it to move in the W41 direction, so that the developing unit 9 rotates counterclockwise by a certain angle, and the first guided surface 261 slips with respect to the first guide surface 167, so that the developing unit 9 moves in the axial direction to the conductive end (moves in the Y1 direction).

[0501] Referring to Fig. 56, as the separation control member 196R continues to move in the W41 direction, the second force receiving portion 272 (separation force receiving surface 272a) which moves together with the developing unit 9 in the axial direction starts to disengage from the separation control member 196R in the W41 direction, i.e. the separation control member 196R does not apply a separation force (spacing force) to the force receiving member 31 in the W41 direction, and the separation control member 196 moves to the limit position, as viewed in the Y1 direction, the separation control member 196R has an overlapping portion with the force receiving member 31. The developing unit 9 is no longer moved toward the conductive end due to the absence of the separation force from the separation control member 196R, but is moved toward the driving end (in the Y2 direction) due to the force applied to the developing unit 9 by the third elastic member 33, so that the separation abutting surface 272b (the outer surface of the force receiving member 31 in the Y2 direction, the separation abutting surface 272b faces the side surface of the processing cartridge in the first direction, the separation abutting surface 272b is located on the side of the separation force receiving surface 272a away from the drum unit 8 and is connected to the X1 direction end of the separation force receiving surface 272a) of the force receiving member 31 abuts against the side surface of the separation control member 196R close to the conductive end (the Y1 direction side surface), and a frictional force is generated therebetween, and the second engaging portion 26 on the developing cover 27 is moved to a position where the second guide surface 262 abuts against the second guide surface 168 of the first engaging portion 16 on the driving side end cover 13. The separation abutting surface 272b can be a vertical side surface (perpendicular to the first direction) or a side surface (arc surface / slope surface) concave inwardly in the Y1 direction or has a certain roughness on the surface, and is preferably used for abutment in the Y direction (an elastic pad with a certain compression amount or roughness can also be provided on the separation force receiving surface 272a and / or the separation abutting surface 272b to further increase the contact frictional force therebetween). The developing coupling 25 of the developing unit 9 (relative to the driving side end cover 13) is moved inwardly in the Y1 direction and can disengage from the main assembly side developing driving coupling member 185 of the image forming apparatus (the main assembly side developing driving coupling member 185 abuts against the blocking member 17 and cannot be moved in the Y1 direction) and does not receive driving force, so that the developing roller 6 and the powder feeding roller are not rotated. Due to the abutment of the separation abutting surface 272b of the force receiving member 31 on the developing cover 27 and the side surface of the separation control member 196R in the Y direction, the frictional force therebetween keeps the separation control member 196R in the position in contact with the force receiving member 31, so that the separation control member 196R cannot return to the intermediate position (non-force applying position), and the developing unit 9 is temporarily blocked from moving in the Y2 direction to the developing position under the action of the third elastic member 33 and its own gravity, and thus the developing unit 9 is kept in the spacing position under the abutment of the two, i.e. the force receiving member 31 and the separation control member 196R also constitute part of the retaining portion (retaining portion, retaining member).

[0502] Referring to Figs. 53 and 57, to make the separation abutting surface 272b more stably abut against the side surface of the separation control member 196R, the included angle R formed between the separation force receiving surface 272a of the force receiving member 31 facing the X2 direction and the separation abutting surface 272b facing the Y2 direction is controlled to be between 80 degrees and 100 degrees. In the length direction (Y direction), a part of the second force receiving portion 272 / separation force receiving surface 272a (the part close to the developing frame 21) is farther away from the outer side surface 13a of the driving side end cover 13 than the separation abutting surface 272b, i.e. the separation abutting surface 272b of the force receiving member 31 is located between the outer side surface 13a of the driving side end cover 13 and the part of the separation force receiving surface 272a in the length direction of the process cartridge.

[0503] Referring to Fig. 54, when the image forming apparatus 500 needs to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the W42 direction, so that the separation control member 196R overcomes the frictional force with the force receiving member 31 and separates from the force receiving member 31, i.e. the side surface of the separation control member 196R is no longer pressed on the separation abutting surface 272b of the force receiving member 31 in the Y2 direction, at this time, the developing unit 9 is driven to move to the driving end by the force of the third elastic member 33 in the Y2 direction, and the developing unit 9 rotates clockwise, the second clamping portion 26 moves from the position where the second guided surface 262 abuts against the second guide surface 168 to the position where the first guided surface 261 abuts against the first guide surface 167, the developing unit 9 moves to the developing position, the developing roller 6 contacts the photosensitive drum 4, the first guided surface 261 abuts against the first guide surface 167 by the elastic force of the third elastic member 33 and keeps the developing unit 9 in the developing position (i.e. the first clamping portion 16 and the second clamping portion 26 also constitute another part of the retaining portion (retaining part, retaining member)), and at the same time, the developing coupling 25 of the developing unit 9 (relative to the driving side end cover 13) moves outwardly in the Y2 direction and engages with the developing driving coupling member 185 of the main assembly side of the image forming apparatus again to receive the driving force. Thereafter, the separation control member 196R returns to the intermediate position again.

[0504] The embodiment realizes the contact and separation of the developing roller 6 and the photosensitive drum 4 by setting the fixed first clamping portion 16 and the second clamping portion 26, the axially movable developing unit 9 and the force receiving member 31, and the interaction between the force receiving member 31 and the separation control member 196R to make the developing unit 9 move axially and rotate, and the cooperation with the first clamping portion 16 and the second clamping portion 26.

[0505] In the present embodiment, referring to Figs. 57 and 58, the force receiving member 31 fixed to the developing unit 9 / developing cover 27 is movable with the developing unit 9 relative to the drum unit 8 between the developing position (contact position) and the spaced position (separation position), and has a movement in the axial direction (Y-axis direction movement) relative to the outer side surface 13a of the drive side end cover 13. In the Y direction, when the developing unit 9 is in the spaced position, the separation abutting surface 272b of the force receiving member 31 is farther away from the outer side surface 13a of the drive side end cover 13 than when the developing unit 9 is in the developing position (contact position), i.e., the separation abutting surface 272b is closer to the outer side surface 13a of the drive side end cover 13 when the developing unit 9 is in the developing position (contact position) than when the developing unit 9 is in the spaced position, i.e., as shown in Figs. 57 and 58, the distance between the separation abutting surface 272b and the outer side surface 13a is H1 when the developing unit 9 is in the developing position, and the distance between the separation abutting surface 272b and the outer side surface 13a is H2 when the developing unit 9 is in the spaced position, H1 < H2.

[0506] The other structures of the process cartridge of the present embodiment can be the same as those of any one of the above-described embodiments, and will not be described here again.

[0507] In the above-described embodiments, when the developing unit 9 is stably held in the developing position, the developing unit 9 can be pushed toward the photosensitive drum 4 under the action of the force (force from the elastic member and / or self-gravity) to make the developing roller 6 contact the photosensitive drum 4; and when the developing unit 9 is stably held in the spaced position, the developing unit 9 cannot be freely rotated clockwise under the action of the force to push toward the photosensitive drum 4.

[0508] Embodiment Eight

[0509] Referring to Fig. 60, the present embodiment provides another process cartridge, which differs from the process cartridge of Embodiment Seven in that the structures of the first engaging portion, the second engaging portion and the force receiving member are different.

[0510] Referring to Figs. 60-61, in this embodiment, the force receiving member 31 is fixedly arranged at the lower end of the developing cover 27, the force receiving member 31 is a block-shaped member, the force receiving member 31 is provided with a second force receiving portion 272 and a separation abutting surface 272b, the second force receiving portion 272 is provided with a separation force receiving surface 272c with a certain inclination angle for abutting in the X1 direction, the separation abutting surface 272b is a surface of the force receiving member 31 in the Y2 direction, the separation abutting surface 272b is connected with the separation force receiving surface 272c in the X direction, and the separation abutting surface 272b is located at the X2 direction side of the separation force receiving surface 272c (i.e. the side close to the drum unit 8). The separation force receiving surface 272c is an inclined surface inclined with respect to the X direction and the Y direction, in the Y direction, the end of the separation force receiving surface 272c connected with the separation abutting surface 272b (the X2 direction end) is closer to the conductive end of the process cartridge than the end of the separation force receiving surface 272c away from the separation abutting surface 272b (the X1 direction end). The separation force receiving surface 272c can abut with the separation control member 196R and receive the separation force, since the separation force receiving surface 272c is an inclined surface, when receiving the separation force, the developing unit 9 can be driven to move counterclockwise to the spaced position and axially move in the Y direction to the direction close to the conductive end.

[0511] Referring to Figs. 60, 62-63, in this embodiment, the first engaging portion 16 is provided on the drum frame 11, and the second engaging portion 26 is provided on the developing frame 21. The drum frame 11 is provided with an extension protrusion 113 at the end in the Y2 and Z1 directions, the extension protrusion 113 extends from the X1 direction side of the drum frame 11 toward the direction in which the developing unit 9 is close to the drum unit 8, the surface (bottom surface) of the extension protrusion 113 toward the Z2 direction is provided with the first engaging portion 16, the first engaging portion 16 is composed of a central protrusion 16c and a guide groove surrounding the central protrusion 16c, the central protrusion 16c is substantially in the shape of a five-sided prism, the central protrusion 16c includes a first side surface 16c1, a second side surface 16c2, a third side surface 16c3, a fourth side surface 16c4, and a fifth side surface 16c5 connected in sequence in the shape of a ring, as viewed in the Z1 direction, the first side surface 16c1 extends in the Y direction, the second side surface 16c2 extends in the X direction, the third side surface 16c3 extends in the Y direction, the fourth side surface 16c4 is inclined with respect to the Y and X directions, the fourth side surface 16c4 is inclined from the X2, Y1 direction side to the X1, Y2 direction side, the fifth side surface 16c5 is inclined with respect to the Y and X directions, and the fifth side surface 16c5 is inclined from the X2, Y2 direction side to the X1, Y1 direction side. The guide groove includes a first groove 16d1 on the outer side of the first side surface 16c1, a second groove 16d2 on the outer side of the second side surface 16c2, a third groove 16d3 on the outer side of the third side surface 16c3, a fourth groove 16d4 on the outer side of the fourth side surface 16c4, and a fifth groove 16d5 on the outer side of the fifth side surface 16c5. The first groove 16d1, the second groove 16d2, the third groove 16d3, the fourth groove 16d4, and the fifth groove 16d5 are in communication in sequence to form a closed groove in the shape of a pentagon. Each groove is away from the outer side surface of the central protrusion 16c and is parallel to each side surface of the central protrusion 16c.

[0512] Referring to Fig. 60, the developing frame 21 is provided with a recessed portion 212 recessed in the X1 direction to avoid the extension protrusion 113, the second engaging portion 26 is provided on the recessed portion 212, the second engaging portion 26 is in the shape of a protrusion column, protrudes upward from the bottom surface of the recessed portion 212 in the Z1 direction, at least partially extends into the guide groove of the first engaging portion 16, and is capable of moving in the guide groove when the developing unit 9 moves relative to the drum unit 8.

[0513] Referring to Figs. 63-65, when the process cartridge is in the state of being loaded into the image forming apparatus 500 in the developing position, the separation control member 196R is in the intermediate position (i.e. the non-acting position), at this time, the separation control member 196R does not apply force to the force receiving member 31, the developing unit 9 is kept in the developing position by the acting force of the first elastic member 3, at this time, the second engaging portion 26 is located at position A within the guide groove, position A is at the position where the fifth groove 16d5 and the first groove 16dl intersect, the second engaging portion 26 abuts against the inner wall surface of the fifth groove 16d5 and / or the first groove 16dl away from the central protrusion 16c.

[0514] Referring to Figs. 63, 66-71, when the image forming apparatus 500 issues a separation instruction, the separation control member 196R moves in the W41 direction (the X1 direction) and abuts against the separation force receiving surface 272c of the second force receiving portion 272 of the force receiving member 31, and pushes the separation force receiving surface 272c during the movement, so that the developing unit 9 rotates counterclockwise and moves axially toward the conductive end, the third elastic member 33 is compressed, during this process, referring to Figs. 63, 67, under the guidance of the first engaging portion 16, the second engaging portion 26 moves from position A in the Y1 direction and passes the vertex where the first side surface 16cl and the second side surface 16c2 intersect to reach position B (at the intersection of the first groove 16dl and the second groove 16d2), referring to Figs. 63, 69, then moves from position B in the X2 direction and passes the vertex where the second side surface 16c2 and the third side surface 16c3 intersect to reach position C (at the intersection of the second groove 16d2 and the third groove 16d3), at this time, the developing unit 9 reaches the maximum separation position, the developing unit 9 does not continue to move toward the conductive end any more. Then, referring to Fig. 70, the separation control member 196R returns to the intermediate position in the W42 direction, the separation control member 196R no longer presses the separation force receiving surface 272c, the developing unit 9 moves axially toward the driving end (the Y2 direction) and rotates clockwise by a certain distance under the action of the first elastic member 3 and the third elastic member 33, the acting force of the third elastic member 33 makes the separation abutting surface 272b of the force receiving member 31 abut against the side surface (the Y1 direction side surface) of the separation control member 196R close to the conductive end, and a frictional force is generated between them, at this time, referring to Figs. 63, 71, the second engaging portion 26 moves from position C in the Y2, X1 direction to position D (within the fourth groove 16d4), and the acting force of the separation control member 196R abutting against the force receiving member 31 makes the second engaging portion 26 abut against the fourth side surface 16c4 of the central protrusion 16c, the developing unit 9 is stably kept in the separation position.

[0515] Referring to Figs. 63-65, 72-73, when the image forming apparatus 500 needs to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R to move to the W42 direction, so that the separation control member 196R overcomes the frictional force between the force receiving member 31 and is separated from the force receiving member 31, i.e. the separation control member 196R no longer abuts against the separation abutment surface 272b of the force receiving member 31 in the Y2 direction. At this time, referring to Figs. 63, 73, the developing unit 9 is moved to the driving end under the action of the first elastic member 3 and the third elastic member 33, and the developing unit 9 rotates clockwise, the second clamping portion 26 moves from the position D along the fourth side surface 16c4 and passes the vertex of the intersection of the fourth side surface 16c4 and the fifth side surface 16c5 to reach the position E and abut against the outer side surface of the fifth groove 16d5 away from the central protrusion 16c, and moves along the outer side surface of the fifth groove 16d5 towards the position A, which has a component in the Y1 direction to the second clamping portion 26, so that the developing unit 9 can be moved to the conductive end by a certain distance against the action of the third elastic member 33, and the developing unit 9 continues to rotate clockwise to the developing position, the developing roller 6 contacts the photosensitive drum 4 and is stably kept in the developing position under the action of the first elastic member 3, and the second clamping portion 26 returns to the position A, referring to Fig. 65. Thereafter, the separation control member 196R returns to the intermediate position in the W41 direction.

[0516] The processing cartridge of the embodiment only has one force receiving member 31, and the force receiving member 31 only receives the separation force but not the contact force, and in addition to the cooperation of the first elastic member 3, the third elastic member 33 and the first clamping portion 16 and the second clamping portion 26, the switching between the contact and separation states of the developing roller 6 and the photosensitive drum 4 can be realized, the structure is simple and is conducive to the miniaturization of the processing cartridge and the extension of the service life of the processing cartridge.

[0517] Embodiment Nine

[0518] When the processing cartridge performs the developing task, the photosensitive drum and the developing roller are in contact and friction for a long time, which can accelerate the deterioration of the developing roller and / or the toner (developer, toner), in order to solve the above technical problem, corresponding structure needs to be provided to realize the switching between the contact and separation states of the developing roller and the photosensitive drum.

[0519] In the prior art, the processing cartridge is provided with a force receiving member 31 for receiving the action force to move the developing unit 9 to the interval position, the force receiving member 31 is provided with a force receiving portion for receiving the action force of the separation control member 196R, the force receiving portion is a force receiving surface on the force receiving member 31, which is generally provided as a vertical surface relative to the developing roller axis or an inclined surface relative to the direction of the developing roller axis in the prior art.

[0520] The prior art has the following problems: the force receiving part 31 is arranged to be a vertical surface or an inclined surface, and the force receiving part 31 and the separation control part 196R are in surface-to-surface contact. During the mutual contact, the force receiving part 31 exerts a reaction force on the separation control part 196R, which causes the separation control part 196R to be pressed and rotated to a certain extent, and then the force receiving part 31 and the separation control part 196R are subjected to unstable force, the developing unit 9 cannot be stably moved to the interval position, and the separation control part 196R can even be damaged.

[0521] Specifically, referring to FIG. 74, when the force receiving surface is an inclined surface, the arc surface 196R11 on the corner of the control part 196R1 of the separation control part 196R is in contact with the force receiving surface (surface-to-surface contact), the separation control part 196R is moved to the W41 direction to exert a separation force on the force receiving surface, and the developing unit 9 is pushed to rotate counterclockwise around the rotation center K3 (i.e., the rotation center K3 of the developing coupling 25) to the interval position. When the developing unit 9 rotates, the force receiving part 31 exerts a reaction force F on the separation control part 196R, and the reaction force F is always perpendicular to the line N2 connecting the rotation center K3 of the developing unit 9 and the contact point P1 of the separation control part 196R and the force receiving surface of the force receiving part 31. When the developing unit 9 is in the developing position, the separation control part 196R just contacts the force receiving part 31 and exerts a separation force, and the vector direction of the reaction force F is above the line N1 connecting the rotation point K4 of the separation control part 196R and the contact point P1 of the separation control part 196R and the force receiving surface of the force receiving part 31. During the movement of the developing unit 9 from the developing position to the interval position counterclockwise, the force receiving surface of the force receiving part 31 slides on the arc surface 196R11 of the control part 1961 relative to the separation control part 196R (i.e., the position of the contact point P1 changes), and the vector direction of the reaction force F exerted by the force receiving part 31 on the separation control part 196R moves from above the line N1 to below the line N1. The separation control part 196R is pressed and rotated around the rotation point K4, the force receiving part 31 is subjected to unstable force, the developing unit 9 cannot be stably moved to the interval position, and the separation control part 196R can even be damaged.

[0522] To solve the above problems, the present embodiment provides a process cartridge, which differs from the seventh embodiment in that the structure of the force receiving part is different.

[0523] Referring to Figs. 75-76, in this embodiment, the force receiving member 31 includes a surface 271e, a separation abutting surface 272b, a first protruding portion 271d, and a second force receiving portion 272. The surface 271e is a surface of the force receiving member 31 facing the X2 direction, the separation abutting surface 272b is a surface of the force receiving member 31 facing the Y2 direction, the first protruding portion 271d protrudes from the surface 271e and protrudes in the X2 direction, the first protruding portion 271d includes a first inclined surface 271d1 and a second inclined surface 271d2, both the first inclined surface 271d1 and the second inclined surface 271d2 are surfaces extending obliquely in the X2, Z1 direction, but the slopes of the first inclined surface 271d1 and the second inclined surface 271d2 are different, the vertex where the first inclined surface 271d1 and the second inclined surface 271d2 intersect is the second force receiving portion 272, and the second force receiving portion 272 is used to contact and receive the separation force from the side surface 196R12 (the portion below the corner arc surface 196R11) of the control portion 196R1 of the separation control member 196R facing the X1 direction, i.e., the contact mode between the force receiving member 31 and the separation control member 196R is a point contact mode.

[0524] Referring to Figs. 77-78, when the developing unit 9 is in the developing position and the separation control member 196R is moving in the W41 direction and just contacts the force receiving member 31, the second force receiving portion 272 abuts against the position near the lower end of the side surface 196R12 of the control portion 196R1 facing the X1 direction, when the separation control member 196R continues to move in the W41 direction, the second force receiving portion 272 receives the separation force and further drives the developing unit 9 to rotate counterclockwise about the rotation center K3 to the interval position, the force receiving member 31 will give the separation control member 196R a reaction force F1, the reaction force F1 is always perpendicular to the line N3 connecting the rotation center K3 of the developing unit 9 and the contact point P2 of the second force receiving portion 272 and the control portion 196R1 of the separation control member 196R. When the separation control member 196R just contacts the force receiving member 31 and applies the separation force, the vector direction of the reaction force F1 is above the line N3 connecting the rotation point K4 of the separation control member 196R and the contact point P2 of the control portion 196R1 of the separation control member 196R and the second force receiving portion 272, during the process that the developing unit 9 moves from the developing position to the interval position counterclockwise, the second force receiving portion 272 slides upward on the side surface 196R12 of the control portion 196R1 facing the X1 direction (has an upward force on the separation control member 196R), the vector direction of the reaction force F1 given by the force receiving member 31 to the separation control member 196R is always above the line N3, the separation control member 196R is not easily pressed to rotate, so that the separation control member 196R can more stably apply the separation force to the force receiving member 31, and the developing unit 9 moves from the developing position to the interval position stably.

[0525] The other structure and the contact / separation movement process of this embodiment are the same as those of Embodiment 7, and will not be described here.

[0526] Embodiment Ten

[0527] Referring to FIGS. 79-80, it is described in Chinese Patent Application CN113574468A that the process cartridge P includes a photosensitive drum 4 (photosensitive member) and a process device for acting on the photosensitive drum 4, and a laser beam U (see FIG. 79) can be emitted from outside the process cartridge and irradiated onto the photosensitive drum 4 to achieve exposure. Referring to FIG. 80, the process device includes a charging device (charging roller as a charging member) for charging the photosensitive drum 4, and a developing device (developing roller 6 as a developing member) for developing a latent image formed on the photosensitive drum 4 by depositing toner onto the photosensitive drum, the developing roller 6 carrying toner on its surface.

[0528] In the above-mentioned document, it is described that the charging member charges in contact with the photosensitive drum. Since the charging member is in contact with the photosensitive drum, residual toner on the photosensitive drum is easily stuck on the charging member, which affects the charging efficiency of the charging member, thereby causing defects in developing quality. In addition, the diameter of the contact charging member is large. In order to leave enough space between the charging member and the developing device to ensure the emission of the laser, the charging member needs to be further away from the developing device, thereby increasing the volume of the process cartridge. Thirdly, since the charging member is very close to the cleaning blade, the diameter of the charging member is too large, which may cause interference with the cleaning blade. Due to the limitation of the charging member, the thickness of the cleaning blade cannot be thickened, and the cleaning amount is limited, which makes it difficult to ensure the cleaning effect. Finally, as the technology of keeping the photosensitive drum and the developing roller separated when not developing gradually becomes mainstream, the space inside the process cartridge is further limited, and the diameter of the contact charging member further limits the miniaturization development of the process cartridge.

[0529] To solve the above-mentioned problems, the present embodiment provides a process cartridge which is detachably installed on a main assembly of an image forming apparatus. Except for the different parts in the present embodiment, the other structures of the process cartridge of the present embodiment can adopt the structures of any of the process cartridges in Embodiments 1-9.

[0530] The process cartridge has two opposite ends in the first direction Y, one of which is a driving end (i.e. Y2), and the other is a non-driving end (i.e. Y1, also called a conductive end), which is not used to receive driving force. The process cartridge includes a drum unit 8 and a developing unit 9.

[0531] Referring to Figs. 81-82, the drum unit 8 includes the photosensitive drum 4, a drum coupling 15, the charging member 5, the cleaning blade 7, a frame portion 115, the drive-side end cover 13, and the conductive-side end cover 14. The photosensitive drum 4 is supported by the drive-side end cover 13 and the conductive-side end cover 14 disposed at both ends of the drum unit 8 in the first direction so as to be rotatable about the axis of the first direction. One end portion of the photosensitive drum 4 is fixedly provided with the drum coupling 15 for receiving a driving force from the main assembly for rotating the photosensitive drum. The charging member 5 is supported by the frame portion 115 for charging the photosensitive drum 4. In addition, the cleaning blade 7 is supported by the frame portion 115 to contact the circumferential surface of the photosensitive drum 4 at a predetermined pressure to remove residual toner on the photosensitive drum 4 that has not been transferred. The frame portion 115, the drive-side end cover 13, and the conductive-side end cover 14 in the drum unit 8 constitute the drum frame 11.

[0532] The developing unit 9 includes the developing roller 6, a developing coupling 25, a developing blade 30, a developing container 125, a developing cover 27, an agitating member, a powder feeding roller, and the like. The developing container 125 is for storing toner to be supplied to the developing roller 6 and supports the developing blade 30 for regulating the thickness of the toner layer on the circumferential surface of the developing roller 6. The developing roller 6 is rotatably supported by the drive-side bearing 23 and the conductive-side bearing 24 mounted to opposite ends of the developing container 125 in the first direction about the axis of the first direction. The agitating member rotates to agitate the toner. The powder feeding roller contacts the developing roller 6 and supplies toner to the surface of the developing roller 6. The developing coupling 25 for receiving a driving force to rotate the developing roller 6 is disposed at one end side of the developing unit 9 in the first direction. The developing coupling 25 is for receiving a rotational driving force from the main assembly and driving the developing roller 6 to rotate through a transmission assembly, which can be a series of gears. The developing cover 27 supporting and covering the developing coupling 25 and the transmission assembly is mounted to one end side of the developing container 125 in the first direction. The developing container 125, the drive-side bearing 23, the conductive-side bearing 24, and the developing cover 27 in the developing unit 9 constitute the developing frame.

[0533] The developing unit 9 is arranged to be movable relative to the drum unit 8 between a contact position and a spaced position, when the developing unit 9 is in the spaced position, the developing roller 6 is spaced apart from the photosensitive drum 4, when the developing unit 9 is in the contact position, the developing roller 6 is in contact with the photosensitive drum, and the developing work can be performed. The developing unit 9 further comprises a first force receiving part 271 and a second force receiving part 272 for receiving a contact force and a separation force respectively from the main assembly, so that the developing unit 9 is movable relative to the drum unit 8 between the contact position and the spaced position. When the developing unit 9 is in the spaced position, the first force receiving part 271 is used to receive the contact force to move the developing unit 9 to the contact position, so that the developing roller 6 and the photosensitive drum 4 are in contact, when the developing unit 9 is in the contact position, the second force receiving part 272 is used to receive the separation force to move the developing unit 9 to the spaced position, so that the developing roller 6 is spaced apart from the photosensitive drum 4.

[0534] Referring to FIG. 83, specifically, in the present embodiment, the second force receiving part 272 is formed at the bottom of the developing cover 27, i.e. the lower end of the developing cover 27 in the third direction (i.e. the Z2 direction). The developing unit 9 further comprises a spacer 510 rotatably arranged on the developing cover 27, for maintaining the spaced state between the photosensitive drum 4 and the developing roller 6 at a predetermined interval, and is a limiting component for limiting the position of the developing unit 9 relative to the drum unit 8. The first force receiving part 271 is formed at the bottom of the spacer 510, i.e. the lower end of the spacer 510 in the direction of gravity. The developing cover 27, the second force receiving part 272, the spacer 510 and the first force receiving part 271 can adopt the arrangement in the prior art, such as the arrangement in CN113574468A, or the arrangement in the above embodiments, the second force receiving part 272 can also be arranged separately from the developing cover 27 or formed on another component other than the developing cover 27, and the first force receiving part 271 can also be formed on a component other than the spacer 510, such as the developing cover 27 or the drive side end cover 13 or the frame portion 115, as long as the second force receiving part 272 can receive the separation force to move the developing unit to the spaced position, and the first force receiving part 271 can receive the contact force to move the developing unit 9 to the contact position.

[0535] In this embodiment, referring to FIGS. 82-83, the charging member 5 is specifically a corona wire, which is arranged along the length direction of the photosensitive drum 4, i.e., along the first direction (Y direction), and is not in contact with the photosensitive drum 4 but is arranged at a position having a preset distance from the photosensitive drum 4, and charges the photosensitive drum 4 by ionizing air at high voltage. The diameter of the corona wire is much smaller than that of a contact-type charging member (such as a charging roller), and the corona wire occupies less space and has a small weight, which is conducive to the lightweight and small-size design of the process cartridge. Secondly, since the corona wire is not in contact with the photosensitive drum 4, residual toner on the photosensitive drum 4 will not stick to the corona wire, and thus the charging efficiency will not be affected during the developing process, and the developing quality can be improved. Thirdly, when the position, angle, thickness or diameter of the charging member 5 and the cleaning blade 7 need to be adjusted, since the corona wire occupies less space, the position, angle, thickness or diameter of the cleaning blade 7 can be adjusted in a larger range of space, and thus the cleaning effect can be ensured. Fourthly, since the diameter of the corona wire is smaller, the corona wire can be arranged closer to the exposure position, i.e., the position where the laser beam U enters the photosensitive drum 4. After the photosensitive drum 4 is charged by the corona wire, the photosensitive drum 4 can be rotated faster to the exposure position, and is irradiated by the laser beam U to develop. Since the travel distance and time between charging and exposure are reduced, the electric quantity of the photosensitive drum 4 can be prevented from being lost during the rotation process, and the developing quality can be further improved.

[0536] Next, the specific arrangement position of the corona wire of this embodiment is described in detail.

[0537] Referring to FIG. 80, in the prior art, in order to enable the laser beam U to be incident from outside the process cartridge P and to be irradiated onto the photosensitive drum 4, in the case where the charging member 5 has a large diameter, in order not to block the laser beam U, the charging member 5 must be disposed as far as possible from the laser beam U, that is, on the side of the photosensitive drum 4 further from the developing roller 6, so that the positional relationship of the charging member 5 is such that, as viewed in the direction of the rotational axis of the developing roller 6, a line between the center M5 of the charging member 5 and the rotational center Ml of the photosensitive drum 4 is N10, the line N10 and the surface of the photosensitive drum 4 form two intersection points, the intersection point further from the center M5 of the charging member 5 of the two intersection points is the far intersection point MXl, a tangent line Nl l to the surface of the photosensitive drum 4 is drawn through the far intersection point MXl, the tangent line Nl l divides the space into two, one side is the region AU2 and the other side is the region AD2, the center M5 of the charging member 5 and the rotational center Ml of the photosensitive drum 4 are on different sides of the tangent line Nl l, and the first force receiving portion 271 (indicated as 510e in FIG. 80 of the prior art) and the second force receiving portion 272 (indicated as 533a in FIG. 80 of the prior art) are on the same side of the tangent line Nl l, wherein the center M5 of the charging member 5 and the rotational center Ml of the photosensitive drum 4 are in the region AU2, and the first force receiving portion 271 (510e) and the second force receiving portion 272 (533a) are in the region AD2, so as to ensure that the charging member 5 is far from the laser beam U. This scheme has a large overall volume of the process cartridge P because the charging member 5 is disposed further from the developing roller 6, so that it is difficult to design the process cartridge to be small.

[0538] Referring to FIG. 84, in the present embodiment, the charging member 5 is a corona wire, and because the corona wire has a small diameter, it can be disposed close to the laser beam U, that is, closer to the developing roller 6 than in the prior art (see FIG. 80). Specifically, in the present embodiment, the positional relationship of the charging member 5 is such that the center M5 of the charging member 5 and the rotational center Ml of the photosensitive drum 4 are on the same side of the tangent line Nl l, specifically in the region AU2, and the first force receiving portion 271 and the second force receiving portion 272. This positional relationship of the charging member 5 enables it to be disposed closer to the developing roller 6, which is advantageous in reducing the overall volume of the process cartridge. In some embodiments, the center M5 of the charging member 5 and the rotational center Ml of the photosensitive drum 4 are on the same side of the tangent line Nl l as one of the first force receiving portion 271 and the second force receiving portion 272, and on the different side of the tangent line Nl l as the other one of the first force receiving portion 271 and the second force receiving portion 272, and the shape or size of the first force receiving portion 271 or the second force receiving portion 272 can be different from that in the drawing of the present embodiment.

[0539] Referring to FIG. 85, in some embodiments, the positional relationship of the charging member 5 can also be set in the following manner: at the driving end of the process cartridge, viewed in the direction of the rotation axis of the developing roller 6, the line between the rotation center M1 of the photosensitive drum 4 and the rotation center K3 of the developing coupling 25 is N0, the angle between the line N10 between the center M5 of the charging member 5 and the rotation center M1 of the photosensitive drum 4 and the line N0 is a, and the value of a is in the range of 25°≤a≤45°, that is, the charging member 5 is set within the angle range C indicated in FIG. 85. Compared with the prior art, this positional relationship of the charging member 5 makes it closer to the developing roller 6, which is conducive to reducing the overall volume of the process cartridge. Further more preferably, the value of a is in the range of 36°≤a≤41°, that is, the charging member 5 is set within the angle range D indicated in FIG. 85.

[0540] Referring to FIG. 86, further, the process cartridge is also provided with a charging connecting piece 5a for receiving voltage from the main assembly and transmitting to the charging member 5. The charging connecting piece 5a is provided on the non-driving end of the process cartridge and located on the drum frame 11 of the drum unit 8, and specifically provided on the frame portion 115. The first end 5a1 of the charging connecting piece 5a is electrically connected with the charging member 5, and the second end 5a2 of the charging connecting piece 5a is exposed through the charging through hole 14a of the conductive side end cover 14, so as to contact with the part outputting voltage on the main assembly after the process cartridge is installed, to receive voltage.

[0541] Embodiment Eleven

[0542] In the prior art, due to the pressure of the compression spring at both ends of the charging member 5 (such as a charging roller) and the arch of the charging member 5 itself, the contact between the charging member 5 and the photosensitive drum 4 is an interference fit. The rotation of the photosensitive drum 4 is driven by the rotation force at the driving end, and the photosensitive drum 4 in turn drives the rotation of the charging member 5. Over a long period of time, the smooth surface of the photosensitive drum 4 will be worn by the rough surface of the charging member 5, which will affect the development quality.

[0543] To solve the above problem, referring to FIG. 87, the present embodiment provides a process cartridge, which is different from the process cartridge of embodiment ten in that the structure of the charging member 5 is different. The process cartridge comprises a drum unit 8, a developing unit 9 and a holding portion, wherein the holding portion can be of any structure in the foregoing embodiments. The drum unit 8 comprises a photosensitive drum 4, a drum coupling 15, a charging member 5, a cleaning blade 7, a frame portion 115, a driving side end cover 13, a conductive side end cover 14 and a conductive piece 53. The photosensitive drum 4 is supported by the driving side end cover 13 and the conductive side end cover 14 provided at both ends of the process cartridge in the first direction (Y direction), so as to be rotatable about the axis of the first direction. One end of the photosensitive drum 4 is fixedly provided with the drum coupling 15 for receiving driving force from the main assembly. The frame portion 115, the driving side end cover 13 and the conductive side end cover 14 in the drum unit 8 constitute a drum frame 11.

[0544] Referring to Figs. 87-88, the cleaning blade 7 is fixedly arranged on the drum frame 11, specifically on the frame portion 115, and extends in the Y direction. The cleaning blade 7 has a length corresponding to that of the photosensitive drum 4. The cleaning blade 7 includes a blade holder 71 and a blade 72. The blade holder 71 includes a fixed side plate 711 and a fixed top plate 712 connected at a right angle. The blade 72 is fixedly connected to the lower end of the fixed side plate 711. The fixed side plate 711 has connecting holes 713 at both ends thereof in the length direction. The connecting holes 713 are used to fix the blade holder 71 to the frame portion 115 by means of bolts. The blade 72 is installed on the frame portion 115 together with the blade holder 71. The blade 72 contacts the circumferential surface of the photosensitive drum 4 under a predetermined pressure to remove the residual toner on the photosensitive drum 4.

[0545] Referring to Fig. 87, in the embodiment, the charging member 5 is supported by the frame portion 115 and is used to charge the photosensitive drum 4. The charging member 5 includes an electrically conductive sponge A51 and a charging support portion A52. The electrically conductive sponge A51 is a sponge strip extending in the Y direction and has a length corresponding to that of the photosensitive drum 4. The electrically conductive sponge A51 is fixedly arranged on the charging support portion A52, preferably by means of adhesion.

[0546] Referring to Figs. 89-91, the charging support portion A52 includes a bottom plate A521, a vertical plate A522, a first support portion 523, a second support portion 524, a fixed portion 525, and a rib plate 526. The bottom plate A521 and the vertical plate A522 are connected in a "T" shape. The vertical plate A522 is connected to the upper end of the bottom plate A521. The electrically conductive sponge A51 is fixed to the lower end of the bottom plate A521.

[0547] Referring to Figs. 89-91, the fixed portion 525 is arranged at both ends of the bottom plate A521 in the length direction and is arranged at the upper end of the bottom plate A521 and located on the side of the bottom plate A521 close to the frame portion 115. The fixed portion 525 is a plate-shaped member. A part of the plate-shaped member extends away from the bottom plate A521 at an angle with respect to the bottom plate A521. The angle between the plate-shaped member and the bottom plate A521 is an acute angle. The upper end of the fixed portion 525 is higher than the upper end of the vertical plate A522. The fixed portion 525 has a hole portion 5251. The hole portion 5251 corresponds to the connecting holes 713 of the fixed side plate 711 of the cleaning blade 7. When assembled, the fixed portion 525 is tightly arranged on the fixed side plate 711. The hole portion 5251 is aligned with the connecting holes 713. Then, the charging support portion A52 and the cleaning blade 7 are fixed to the frame portion 115 by means of bolts passing through the hole portion 5251 and the connecting holes 713 in sequence. Alternatively, the fixed portion can be arranged on the vertical plate.

[0548] Referring to FIGS. 89-91, the first support portion 523 is arranged at the upper end of the bottom plate A521 and on the side of the bottom plate A521 close to the frame portion 115. The first support portion 523 includes an abutting portion 5231 and a support plate 5232. The abutting portion 5231 is a block-shaped or plate-shaped member. One side of the abutting portion 5231 facing the fixed side plate 711 is an abutting surface. The abutting surface is a flat surface and is inclined with respect to the bottom plate A521. The support plate 5232 connects the abutting portion 5231 and the bottom plate A521 and supports the abutting portion 5231. The support plate 5232 can be a right-angled triangular plate. One side of the support plate 5232 opposite to the abutting portion 5231 is connected to the hypotenuse of the support plate 5232. One straight side of the support plate 5232 is connected to the bottom plate A521. The abutting portion 5231 is arranged on the bottom plate A521 at a certain inclination angle (the included angle between the hypotenuse and the straight side of the support plate 5232, which is an acute angle). The abutting portion 5231 can be supported by a plurality of support plates 5232 to make the abutting portion 5231 more stable. The upper end of the abutting portion 5231 is higher than the upper end of the vertical plate A522 and lower than the upper end of the fixed portion 525.

[0549] Referring to FIGS. 89-91, in this embodiment, a plurality of first support portions 523 can be arranged. The plurality of first support portions 523 are arranged at intervals along the length direction of the bottom plate A521. The abutting surfaces of the plurality of first support portions 523 are in the same plane. The abutting surfaces are also in the same plane as the surface of the fixed portion 525 facing the fixed side plate 711. When the charging support portion A52 is fixed to the frame portion 115, the abutting surfaces of the plurality of first support portions 523 abut against the fixed side plate 711 of the cleaning blade 7. Thus, the flatness of the charging support portion A52 in the axial direction (length direction) is ensured.

[0550] Referring to FIGS. 89-91, the second support portion 524 is arranged at the upper end of the vertical plate A522 and extends away from the bottom plate A521. The second support portion 524 is arranged at the middle of the vertical plate A522 in the axial direction (length direction). The second support portion 524 is substantially a fence-shaped member. The second support portion 524 includes a plurality of vertical flanges 5241 arranged side by side and extending upward and a horizontal flange 5242 connecting the upper ends of the vertical flanges 5241. The horizontal flange 5242 extends parallel to the vertical plate A522 and the bottom plate A521, i.e., in the Y direction. The horizontal flange 5242 is arranged at a position higher than the upper ends of the fixed portion 525 and the first support portion 523. When the charging support portion A52 is fixed to the frame portion 115, the second support portion 524 abuts against the blade holder 71 of the cleaning blade 7. Specifically, the horizontal flange 5242 can abut against the fixed top plate 712. Alternatively, the second support portion 524 can abut against the connection between the fixed side plate 711 and the fixed top plate 712 (i.e., abut against both the fixed side plate 711 and the fixed top plate 712). The abutment between the second support portion 524 and the blade holder 71 can prevent the charging support portion A52 from deforming upward when the photosensitive drum 4 rotates.

[0551] Referring to Figs. 89-91, the gusset 526 is a right-angled triangular plate-shaped member arranged at the upper end of the bottom plate A521, with one of the right-angled sides connected to the bottom plate A521 and the other connected to the vertical plate A522. The gusset 526 serves as a support to increase the strength and prevent the charging support portion A52 from deforming. Preferably, a plurality of gussets 526 are arranged along the length of the charging support portion A52, with gussets 526 arranged on both sides of the vertical plate A522 to increase the overall strength and prevent twisting and deforming. The upper end of the gusset 526 is lower than the upper end of the vertical plate A522 (i.e. does not protrude above the upper end of the vertical plate A522).

[0552] In this embodiment, each part of the charging support portion A52 can be an integrally formed structure or a separate structure connected by adhesion, clamping or the like.

[0553] Referring to Figs. 87 and 91, the conductive member 53 is used to receive the voltage from the image forming apparatus 500 and transmit it to the charging member 5, which in turn charges the photosensitive drum 4. The conductive member 53 is arranged on the conductive side end cover 14 and has an electrode contact 531 exposed outside the conductive side end cover 14 to contact an electrical output member (not shown) to receive the voltage when the process cartridge is installed in the image forming apparatus 500. The conductive member 53 also includes an electrical contact portion 532 which contacts the charging member 5 to transmit the voltage. In this embodiment, the conductive member 53 is preferably a conductive steel sheet or a conductive copper sheet, and the electrode contact 531 and the electrical contact portion 532 are both parts of the conductive steel sheet. The electrical contact portion 532 is preferably a conductive spring which can abut against the charging member 5 by its own elasticity to ensure stable transmission of the voltage.

[0554] In this embodiment, the part of the charging member 5 which contacts the electrical contact portion 532 to conduct electricity is referred to as the conductive portion, which needs to be made of a conductive material. Preferably, the electrical contact portion 532 contacts the conductive end of the bottom plate A521 and / or the vertical plate A522 of the charging support portion A52, which are made of a conductive material. The voltage is received by the bottom plate A521 and the vertical plate A522 and transmitted to the conductive sponge A51 fixed to the lower end of the bottom plate A521, which in turn charges the photosensitive drum 4.

[0555] Alternatively, the end of the vertical plate A522 or the bottom plate A521 which contacts the electrical contact portion 532 can be made of a conductive material, and the other parts which do not contact the electrical contact portion 532 can be made of other materials.

[0556] Alternatively, the conductive sponge A51 can be the conductive portion, and the electrical contact portion 532 of the conductive member 53 is arranged to directly contact the conductive end of the conductive sponge A51, which directly receives the voltage and charges the photosensitive drum 4.

[0557] Alternatively, the charging support A52 is made of conductive material as a whole, that is, the charging support A52 as a whole is a conductive part, and the electric contact part 532 of the conductive part 53 can contact any position of the charging support A52. After the charging support A52 receives the voltage, the voltage is transmitted to the conductive sponge A51, and the conductive sponge A51 charges the photosensitive drum 4.

[0558] The charging part 5 of the embodiment contacts and charges the photosensitive drum 4 through the conductive sponge A51 which is softer than the surface of the photosensitive drum 4, which can reduce the wear of the surface of the photosensitive drum 4. The conductive sponge A51 can also clean the residual toner that cannot be cleaned by the cleaning blade 7 while charging the photosensitive drum 4.

[0559] The other structures of the process cartridge of the embodiment are the same as those of the tenth embodiment, and will not be described here.

[0560] Embodiment Twelve

[0561] In the prior art, the integrated process cartridge for the image forming device is divided into the top-mounted type, the bottom-mounted type and the side-mounted type according to the position of the photosensitive drum in the process cartridge. In particular, the bottom-mounted process cartridge (i.e., the photosensitive drum faces the bottom of the machine when the process cartridge is loaded into the machine) is usually provided with a spacer 510 to keep the developing roller and the photosensitive drum separated when not working (for example, the holding part 510b on the spacer 510 of CN113574468A abuts against the part on the drum unit to keep the separation state). In the process cartridge in this scheme, the developing roller is pushed against the holding part surface by the combined force of the weight of the developing roller and the elastic force of the spring (the first elastic member 3) at the non-driving end in the drum roller separation state (i.e., the photosensitive drum 4 is spaced apart from the developing roller 6, i.e., the developing unit 9 is in the spaced position), to achieve the effect of keeping separation. Referring to FIG. 80, the developing unit 9 can move relative to the drum unit 8 about the rotation center K (i.e., the axis of the developing shaft 25) between the developing position and the spaced position. When the developing unit 9 is in the spaced position, the center of gravity of the developing unit 9 is located on the X1 direction side (the side away from the drum unit 8) of the vertical line of the rotation center K, i.e., the weight moment of the weight of the developing unit 9 is in the clockwise direction, and the elastic moment of the first elastic member 3 is also in the clockwise direction. The two moments act on the holding part together, so that the combined force acting on the holding part is large, and in particular, the pressure generated by the weight of the developing unit 9 is likely to damage the holding part, so that the process cartridge cannot keep separation.

[0562] To solve the above problems, referring to FIGS. 92-93, the embodiment provides a process cartridge, which is different from the foregoing embodiments in that the position of the charging part 5 is different.

[0563] Referring to FIGS. 94-98, in this embodiment, the charging member 5 is a charging roller, and the charging member 5 is arranged on the developing unit 9. Specifically, the charging member 5 is movably arranged on the developing unit 9 by a support frame 54. The developing frame 21 is provided with a first pivot portion A212 on each of the two end faces in the Y1 and Y2 directions, and the first pivot portion A212 is arranged close to the drum unit 8 in the X direction. The support frame 54 is provided with two first pivot portions A212 connected to the two ends of the developing frame 21.

[0564] Referring to FIGS. 94-98, the support frame 54 is an arm-shaped member. One end of the support frame 54 is provided with a second pivot portion 541 movably connected to the first pivot portion A212. The first pivot portion A212 and the second pivot portion 541 are connected by a shaft and a hole. Preferably, the first pivot portion A212 is a pivot shaft protruding from the end face of the developing frame 21 in the Y direction, and the second pivot portion 541 is a pivot hole sleeved on the pivot shaft, so that the support frame 54 can rotate around the first pivot portion A212. Further, a anti-disengagement portion 213 can be arranged on the Y1 direction end of the first pivot portion A212 to prevent the support frame 54 from disengaging. The anti-disengagement portion 213 can be a bolt or a protruding structure. The other end of the support frame 54 is provided with an engaging portion 542 connected to the charging member 5. The engaging portion 542 is an arc-shaped claw member, and the shaft of the charging member 5 is clamped in the claw, so that the charging member 5 is movably connected to the developing unit 9.

[0565] Referring to FIGS. 94-98, the charging member 5 is arranged on the side of the developing frame 21 facing the drum unit 8, and the charging member 5 can contact the surface of the photosensitive drum 4 to charge the photosensitive drum 4. The support frame 54 arranged on the non-driving end (i.e., the Y1 direction end, also referred to as the conductive end) of the developing unit 9 can be made of a conductive material, and the support frame 54 is in contact with a conductive member 53. The conductive member 53 is used to receive the voltage of the image forming apparatus 500 and transmit it to the support frame 54, and then the support frame 54 transmits the voltage to the charging member 5, and the charging member 5 charges the photosensitive drum 4. The conductive member 53 is arranged on the conductive side end cover 14, and the conductive member 53 has an electrode contact exposed outside the conductive side end cover 14, and in contact with an electrical output member (not shown) to receive the voltage when the process cartridge is installed in the image forming apparatus 500.

[0566] Further, referring to Figs. 94-98, a force applying elastic member 55 is further included for applying a force to the support frame 54 so that the charging member 5 has a force towards the photosensitive drum 4, thereby being in close contact with the photosensitive drum 4, and when the photosensitive drum 4 rotates, the charging member 5 is rotated along with the photosensitive drum 4 by the frictional force of the photosensitive drum 4. The force applying elastic member 55 is preferably a torsion spring, a coil of which is sleeved on the first pivot portion A212, one arm of which is in abutment with the developing frame 21 and the other arm of which is in abutment with the support frame 54, thereby continuously applying a force to the support frame 54 for making the charging member 5 closely contact the photosensitive drum 4. The support frame 54 can be provided with an abutment protrusion 543 in abutment with the other arm and preventing the force applying elastic member 55 from being detached from the support frame 54.

[0567] Since the charging member 5 is arranged on the developing unit 9, the weight of the developing unit 9 is changed, and the center of gravity of the developing unit 9 is also different when the developing unit 9 is in the developing position and the spaced position, i.e. the center of gravity of the developing unit 9 moves to the X1 and X2 sides of the vertical line L of the rotation center K with the movement of the developing unit 9.

[0568] Referring to Fig. 99, when the developing unit 9 is in the developing position, the center of gravity P4 of the developing unit 9 is on the side of the vertical line L of the rotation center K away from the drum unit 8 (i.e. the X1 side) as viewed along the direction of the rotation axis from the driving end, so that the gravitational moment G1 of the developing unit 9 around the rotation center K generated by the weight of the developing unit 9 is in the clockwise direction, the elastic moment N4 of the developing unit 9 around the rotation center K generated by the first elastic member 3 is also in the clockwise direction, and the developing unit 9 is kept in the developing position by the resultant force of the gravitational moment G1 and the elastic moment N4, and the developing roller 6 closely contacts the photosensitive drum 4.

[0569] Referring to Fig. 100, when the separation control member 196R moves to the W41 direction to the second force receiving portion 272 on the spacer 510 to contact, the second force receiving portion 272 is applied with the separation force, the developing unit 9 is moved to the spaced position, so that the developing roller 6 is separated from the photosensitive drum 4, and at the same time, the spacer 510 is also rotated to the position where the holding portion 510b abuts against the member on the drum unit 8, so that the developing unit 9 is kept in the spaced position. Since the support frame 54 can move relative to the first pivot portion A212, the support frame 54 can rotate relative to the developing unit 9 when the developing unit 9 moves, so that the surface of the charging member 5 still contacts the surface of the photosensitive drum 4. The gravity moment G2 of the developing unit 9 around the rotation center K generated by the weight of the developing unit 9 is opposite to the direction of the elastic moment N4 of the first elastic member 3, i.e. the holding portion 510b is not subjected to the combined action of the gravity moment G1 and the elastic moment N4 in the same direction, but is subjected to the effect of the elastic moment N4 in the clockwise direction and the gravity moment G2 in the opposite direction. Since the elastic moment N4 is greater than the gravity moment G2, the developing unit 9 can still make the spacer 510 abut against the member on the drum unit 8 by the force after the elastic moment N4 offsets the gravity moment G2, so as to keep the separated state, but the stress on the spacer 510 (especially the holding portion 510b) is greatly reduced, the possibility of damage of the spacer 510 is reduced, and the service life of the spacer 510 is prolonged.

[0570] Further, the size of the force of the first elastic member 3 can be adjusted, so that the elastic moment N4 of the first elastic member 3 is smaller than the gravity moment G2 of the weight of the developing unit 9. When the developing unit 9 is in the spaced position, the upper end (the Z1 direction end) of the developing unit 9 abuts against the drum unit 8 as a whole, and the spacer 510 does not contact the member on the drum unit 8, i.e. the spacer 510 does not need to keep the separated state, and the possibility of damage of the spacer 510 is further reduced. When the developing is needed, the separation control member 196R moves to the W42 direction to contact the first force receiving portion 271 on the spacer 510, and the first force receiving portion 271 is applied with the contact force. Since the resultant force of the contact force and the elastic force of the first elastic member 3 is greater than the weight force of the developing unit 9, the developing unit 9 moves around the rotation center K to the developing position.

[0571] In the embodiment, the charging member 5 is arranged on the developing unit 9, the gravity center of the developing unit 9 is changed, the gravity center is closer to the drum unit 8 when the developing unit 9 is in the spaced position, the direction of the gravity moment G2 is opposite to the direction of the elastic moment N4 of the first elastic member 3, the stress on the spacer 510 is reduced, and the risk of damage is reduced.

[0572] Embodiment Thirteen

[0573] The present embodiment provides another process cartridge, which differs from the process cartridge of Embodiment 12 in that the manner of changing the position of the center of gravity of the developing unit 9 is different.

[0574] Referring to Figs. 101-102, in the present embodiment, the charging member 5 is no longer provided on the developing unit 9, nor are the first pivot portion A212, the support frame 54, the force applying elastic member 55, and the like provided, but instead a configuration block is provided on the developing unit 9 to change the position of the center of gravity P5 of the developing unit 9, so that when the developing unit 9 is in the spaced position, the center of gravity P5 of the developing unit 9 is on the side of the drum unit 8 with respect to the perpendicular L of the rotation center K, i.e., so that the gravitational moment G2 of the developing unit 9 about the rotation center K due to its own weight is in the opposite direction to the elastic moment N4 of the first elastic member 3, thereby reducing the stress on the spacer 510 and reducing the risk of damage.

[0575] Referring to Figs. 101-102, in the present embodiment, the counterweight 214 is provided on the developing frame 21, specifically on the side of the developing frame 21 near the drum unit 8 (the X2 direction side) and on the upper end (the Z1 direction end) of the developing frame 21. The counterweight 214 can be provided as a strip-shaped member, the length direction of which extends in the Y direction, and can be fixed to the developing frame 21 by adhesion, engagement, or the like.

[0576] The counterweight 214 can be made of a metal material having a certain weight, or can be made of another material.

[0577] The counterweight 214 can also have another geometric form, such as a block-shaped member, and a plurality of counterweights 214 can be provided at different / same positions of the developing frame 21, as long as the center of gravity of the developing unit 9 can be changed.

[0578] In the present embodiment, referring to Fig. 103, the size relationship between the gravitational moment G2 and the elastic moment N4 can be changed by adjusting the weight / position of the counterweight 214 and / or adjusting the elastic force of the first elastic member 3, so that the gravitational moment G2 is greater than the elastic moment N4, and when the developing unit 9 is in the spaced position, the upper end (the Z1 direction end) of the developing unit 9 as a whole abuts against the drum unit 8 (i.e., the upper end of the developing frame 21 abuts against the upper end of the drum frame 11), and the spacer 510 has a gap with the drive side end cover 13 on the drum unit 8, i.e., the spaced state does not need to be maintained by the spacer 510 abutting against the component on the drum unit 8, further reducing the possibility of damage to the spacer 510.

[0579] Embodiment 14

[0580] The present embodiment provides a process cartridge, which differs from the process cartridges of the foregoing embodiments in that the structure of the force receiving portion is different.

[0581] Referring to Fig. 104, the process cartridge of the present embodiment includes the drum unit 8, the developing unit 9, a holding portion, and a force receiving portion. The holding portion can be the structure of any of the foregoing embodiments.

[0582] Referring to Figs. 104-106, in the present embodiment, the force receiving portion is fixedly provided at the lower end (Z2 direction end) of the developing cover 27, and includes a first force receiving portion 271, a second force receiving portion 272, and a guide portion 276f. Specifically, the lower end of the developing cover 27 is provided with two plate members (first plate member 276a and second plate member 276b) that are provided opposite each other in the Y direction, the length directions of the two plate members extend in the X direction, and the two plate members have a spacing in the Y direction. The first force receiving portion 271 is provided on the side surfaces of the two plate members facing each other, and in the X direction, the first force receiving portion 271 is provided at the end of the plate members closer to the drum unit 8. The first force receiving portion 271 includes two contact force receiving protrusions 276c, one of which is provided on the side surface of the first plate member 276a facing the second plate member 276b, and the other of which is provided on the side surface of the second plate member 276b facing the first plate member 276a. The two contact force receiving protrusions 276c are provided opposite each other in the Y direction, and the facing surfaces of the two contact force receiving protrusions 276c are planes extending in the X direction.

[0583] Referring to Figs. 105-106, the second force receiving portion 272 is also provided on the two plate members, and in the X direction, the second force receiving portion 272 is located at the end of the plate members farther from the drum unit 8, i.e., the X1 direction side of the first force receiving portion 271. The second force receiving portion 272 has a spacing from the first force receiving portion 271 in the X direction, and this spacing is the middle portion 276e of the first plate member 276a and the second plate member 276b. The second force receiving portion 272 includes two separation force receiving protrusions 276d, one of which is provided on the side surface of the first plate member 276a facing the second plate member 276b, and the other of which is provided on the side surface of the second plate member 276b facing the first plate member 276a. The two separation force receiving protrusions 276d are provided opposite each other in the Y direction, and the facing surfaces of the two separation force receiving protrusions 276d are planes extending in the X direction. In the Y direction, the spacing between the two contact force receiving protrusions 276c is the same as the spacing between the two separation force receiving protrusions 276d, and the spacing of the middle portion 276e is greater than the width of the control portion 196R1 (protrusion) of the separation control member 196R in the Y direction.

[0584] Referring to Figs. 105-106, a guide portion 276f is provided on the entry end of the first force receiving portion 271 (i.e. the end close to the second force receiving portion 272 in the X direction) for guiding the control portion 196R1 of the separation control member 196R to enter the first force receiving portion 271; and a guide portion 276f is also provided on the entry end of the second force receiving portion 272 (i.e. the end close to the first force receiving portion 271 in the X direction) for guiding the control portion 196R1 of the separation control member 196R to enter the second force receiving portion 272. The guide portion 276f has a third guide surface which is a slope or an arc, so that the entry ends of the first force receiving portion 271 and the second force receiving portion 272 form a shape similar to a bell mouth, facilitating the entry of the control portion 196R1.

[0585] Referring to Fig. 106, preferably, a one-way friction member 276g is provided on the first force receiving portion 271 and the second force receiving portion 272, which has the characteristic of providing a larger friction force in one direction and a smaller friction force in the other direction. When the control portion 196R1 enters the first force receiving portion 271 or the second force receiving portion 272, a larger friction force is generated therebetween, which is sufficient to drive the developing unit 9 to move to the developing position or the spaced position. When the control portion 196R1 exits the first force receiving portion 271 or the second force receiving portion 272, a smaller friction force is generated therebetween, which is insufficient to drive the developing unit 9 to move with the separation control member 196R, i.e. the separation control member 196R can return to the neutral position normally, while the developing unit 9 continues to keep its current position under the action of the holding portion.

[0586] The one-way friction member 276g can be provided on the side surface of both the contact force receiving protrusion 276c and the separation force receiving protrusion 276d, or only on the side surface of one of the contact force receiving protrusion 276c and the separation force receiving protrusion 276d.

[0587] The one-way friction member 276g can be a harder rubber plate with fine and dense saw-toothed surface, the openings of the saw teeth facing the entering ends of the first force receiving portion 271 and the second force receiving portion 272, so that the control portion 196R1 enters against the saw teeth to generate a larger friction force, and exits along the saw teeth to generate a smaller friction force. When the one-way friction member 276g is provided as described above, the distance between the top of the saw teeth of the oppositely provided saw-toothed rubber plate (or the distance from the top of the saw teeth of the saw-toothed rubber plate to the opposite plane) is slightly smaller than the width of the control portion 196R1 (the protrusion) in the Y direction, and the distance between the bottoms of the saw teeth of the saw-toothed rubber plate (or the minimum distance from the bottoms of the saw teeth of the saw-toothed rubber plate to the opposite plane) is equal to or slightly larger than the width of the control portion 196R1 (the protrusion) in the Y direction. The saw teeth can be triangular, rhombic, trapezoidal, or other shapes. The one-way friction member 276g can be other materials or structures with the same characteristics.

[0588] Referring to FIGS. 107-108, when the image forming apparatus 500 needs to perform the developing process, the image forming apparatus 500 issues an instruction to control the separation control member 196R located in the intermediate portion 276e of the first plate member 276a and the second plate member 276b to move in the W42 direction, the control portion 196R1 first contacts the guide portion 276f of the entering end of the first force receiving portion 271, and slides along the third guide surface to enter between the two contact force receiving protrusions 276c, the control portion 196R1 contacts the one-way friction member 276g on the side surface of the contact force receiving protrusion 276c, and due to the one-way friction characteristic, a larger friction force is generated when the control portion 196R1 relatively slides in the W42 direction, which drives the developing unit 9 to move to the developing position, the developing roller 6 contacts the photosensitive drum 4, and the developing unit 9 is maintained at the developing position under the action of the retaining portion. Subsequently, the separation control member 196R is reset in the W41 direction, at this time, the friction force between the control portion 196R1 and the one-way friction member 276g is small, and cannot overcome the force of the retaining portion to drive the developing unit 9 to move, the separation control member 196R smoothly exits the first force receiving portion 271 to return to the intermediate position (the non-force application position), and the developing unit 9 continues to be maintained at the developing position under the action of the retaining portion.

[0589] Referring to FIG. 107 and FIG. 109, after the image forming apparatus 500 does not need to perform the developing process, the image forming apparatus 500 sends a command to control the separation control component 196R located in the intermediate portion 276e of the first plate member 276a and the second plate member 276b to move in the W41 direction, and the control portion 196R1 first contacts the guide portion 276f of the entry end of the second force receiving portion 272, and then moves along the third guide surface into the space between the two separation force receiving protrusions 276d, and the control portion 196R1 contacts the one-way friction member 276g on the side surface of the separation force receiving protrusion 276d. Due to the one-way friction characteristic, a relatively large friction force is generated when the control portion 196R1 relatively slides in the W41 direction, and the friction force drives the developing unit 9 to move from the developing position to the interval position, and the developing roller 6 is separated from the photosensitive drum 4, and the developing unit 9 is kept in the interval position under the action of the retaining portion. Then, the separation control component 196R1 resets in the W42 direction, and at this time, the friction force between the control portion 196R1 and the one-way friction member 276g is relatively small, the separation control component 196R1 smoothly exits the second force receiving portion 272 and returns to the intermediate position, and the developing unit 9 continues to be kept in the interval position.

[0590] The force receiving portion of the embodiment realizes the movement of the developing unit 9 between the developing position and the interval position through the friction force of the contact between the side surface and the separation control component 196R, and there is no position (corner) where stress concentration is prone to occur, thereby effectively reducing the risk of fracture of the force receiving portion of the process cartridge.

[0591] Embodiment Fifteen

[0592] The embodiment provides another process cartridge, which is different from the embodiment fourteen in that the structure of the force receiving portion is different.

[0593] Referring to FIG. 110, in the embodiment, only the contact force receiving protrusion 276c and the separation force receiving protrusion 276d are arranged on the first plate member 276a or the second plate member 276b, and the plate member without the protrusion is used as the force receiving plate 276h to form the first force receiving portion 271 together with the contact force receiving protrusion 276c, and to form the second force receiving portion 272 together with the separation force receiving protrusion 276d.

[0594] Correspondingly, the one-way friction member 276g can be arranged on the side surface of the contact force receiving protrusion 276c or the side surface of the separation force receiving protrusion 276d, and can also be arranged on the side surface of the force receiving plate 276h facing the protrusion. The distance between the one-way friction members 276g is the same as that in the above embodiments.

[0595] The guide portion 276f is arranged at the end of the contact force receiving protrusion 276c close to the separation force receiving protrusion 276d, and the guide portion 276f is also arranged at the end of the separation force receiving protrusion 276d close to the contact force receiving protrusion 276c.

[0596] Referring to Figs. 111-112, in this embodiment, when the separation control component 196R is in the intermediate position, one side of the control portion 196R1 can be attached to the force receiving plate 276h. When the image forming apparatus 500 needs to perform the developing process, the separation control component 196R moves in the W42 direction, the control portion 196R1 is attached to the force receiving plate 276h and moves to contact the guide portion 276f at the end of the contact force receiving protrusion 276c, and slides along the third guide surface into between the contact force receiving protrusion 276c and the force receiving plate 276h. The control portion 196R1 contacts the one-way friction member 276g. Due to the one-way friction characteristic, a relatively large friction force is generated when the control portion 196R1 relatively slides in the W42 direction. This friction force drives the developing unit 9 to move to the developing position, the developing roller 6 contacts the photosensitive drum 4, and the developing unit 9 is kept in the developing position under the action of the retaining portion. Subsequently, the separation control component 196R resets in the W41 direction. At this time, the friction force between the control portion 196R1 and the one-way friction member 276g is relatively small, and cannot overcome the force of the retaining portion to drive the developing unit 9 to move. The separation control component 196R smoothly exits the first force receiving portion 271 and returns to the intermediate position (non-force application position), while the developing unit 9 continues to be kept in the developing position under the action of the retaining portion.

[0597] Referring to Figs. 111 and 113, when the image forming apparatus 500 does not need to perform the developing process, the separation control component 196R moves in the W41 direction, the control portion 196R1 is attached to the force receiving plate 276h and moves to contact the guide portion 276f at the end of the separation force receiving protrusion 276d, and slides along the third guide surface into between the separation force receiving protrusion 276d and the force receiving plate 276h. The control portion 196R1 contacts the one-way friction member 276g. Due to the one-way friction characteristic, a relatively large friction force is generated when the control portion 196R1 relatively slides in the W41 direction. This friction force drives the developing unit 9 to move from the developing position to the interval position, the developing roller 6 is separated from the photosensitive drum 4, and the developing unit 9 is kept in the interval position under the action of the retaining portion. Subsequently, the separation control component 196R1 resets in the W42 direction. At this time, the friction force between the control portion 196R1 and the one-way friction member 276g is relatively small, the separation control component 196R1 smoothly exits the second force receiving portion 272 and returns to the intermediate position, and the developing unit 9 continues to be kept in the interval position.

[0598] The other structures of this embodiment are the same as those of Embodiment XIV, and will not be described here.

[0599] Embodiment XVI

[0600] When the processing cartridge without the drum roller separation mechanism in the prior art is used for color developing, the developing coupling and the drum coupling of the processing cartridge are always engaged with the driving coupling of the image forming device and receive driving force, so the photosensitive drum and the developing roller are always rotating. When the processing cartridge does not develop but receives driving force, the photosensitive drum always receives laser beams transmitted from the image forming device through the laser entrance of the processing cartridge because the charging member (such as the charging roller) directly contacts the photosensitive drum, so that the photosensitive drum surface forms a latent electrostatic image and the potential of the photosensitive drum surface is raised, thereby continuously adsorbing the toner delivered by the developing roller and transmitting to the transfer belt, causing unnecessary developer deposition, affecting the subsequent developing quality, and even causing the image forming device to report an error, resulting in a serious problem that the developing cannot be performed.

[0601] Referring to FIG. 114, to solve the above problems, the embodiment provides a processing cartridge, which includes a drum unit 8, a developing unit 9, a moving piece, a force receiving part, and a transmission unit. The moving piece is a first charging mechanism movably arranged on the drum unit 8, and the first charging mechanism is arranged to be movable between a working position and a shielding position. In the working position, the first charging mechanism does not shield the laser beam U entering from the laser entrance, and the laser beam U can irradiate the surface of the photosensitive drum 4 to form a latent electrostatic image. In the shielding position, the first charging mechanism is located on the entering path of the laser beam U, and the laser beam U irradiates the first charging mechanism and cannot irradiate the surface of the photosensitive drum 4, so that the surface of the photosensitive drum 4 cannot form a latent electrostatic image, and the potential cannot be raised, so that the carbon powder delivered by the developing roller 6 cannot be adsorbed.

[0602] Referring to Figs. 115-118, the first charging mechanism includes a charging member 5 (e.g., a charging roller), a charging member support portion 56, an elastic force applying member 55, an engaging portion 57, and an oscillation elastic member 58. The charging member support portion 56 is a frame-like member having a hole portion 561 provided at an upper end thereof, and the drum frame 11 has a support shaft A113 extending through the hole portion 561, so that the charging member support portion 56 is able to oscillate about the support shaft A113, and the support shaft A113 extends in the Y direction, i.e., the oscillation axis of the charging member support portion 56 extends in the Y direction. The charging member support portion 56 has a sliding groove extending in the Z direction inside thereof, and the engaging portion 57 is slidably provided in the sliding groove, and the engaging portion 57 is an arc-shaped claw member, and the shaft of the charging member 5 is engaged in the claw. The elastic force applying member 55 is provided between the charging member support portion 56 and the engaging portion 57, and applies a force to the engaging portion 57, so that the charging member 5 has a force directed toward the photosensitive drum 4, and thus is in close contact with the photosensitive drum 4, and when the photosensitive drum 4 rotates, the charging member 5 is rotated following the photosensitive drum 4 by the frictional force of the photosensitive drum 4, and the elastic force applying member 55 is preferably a compression spring. The oscillation elastic member 58 is provided between the drum frame 11 and the charging member support portion 56, and applies a force to the charging member support portion 56, so that the entire first charging mechanism moves from the working position to the shielding position relative to the drum frame 11, and the oscillation elastic member 58 is preferably a torsion spring, and the entire torsion spring is provided on the support shaft A113, and one arm thereof is in abutment with the drum frame 11, and the other arm thereof is in abutment with the charging member support portion 56. The charging member support portion 56 has a first protrusion 562 provided on the side thereof in the X1 direction and protruding in the X1 direction, and the first protrusion 562 is provided close to the Z2 direction end of the charging member support portion 56 in the Z direction. The first protrusion 562 can be a trapezoidal protrusion, and the width thereof in the Y direction gradually decreases in the X1 direction, i.e., the side surfaces thereof in the Y1 and Y2 directions are inclined surfaces.

[0603] Referring to Figs. 114, 116, 119-120, the force receiving portion includes an oscillation force receiving member 39, a return force receiving member 40, and a return elastic member 41. The oscillation force receiving member 39 is rotatably provided inside the drive side end cover 13, and includes a gear portion 391, a third hole portion 392, a retaining protrusion 393, and a first force receiving portion 271, and the inside of the drive side end cover 13 has a first rotation shaft 138 extending in the Y direction, and the oscillation force receiving member 39 is provided on the first rotation shaft 138 via the third hole portion 392 and is able to oscillate about the first rotation shaft 138. The retaining protrusion 393 is provided on the X1 direction side of the oscillation force receiving member 39, and protrudes in the radial direction, and specifically, protrudes obliquely in the X1 and Z2 directions, and the first force receiving portion 271 is provided at the Z2 direction end of the oscillation force receiving member 39 and protrudes toward the Z2 direction end of the process cartridge, and is used to receive the force of the separation control member 196R.

[0604] Referring to FIG. 116, FIG. 119, FIG. 121, the reset force receiving member 40 is rotatably arranged at the inner side of the driving side end cover 13, and the rotation axis of the reset force receiving member 40 is farther away from the photosensitive drum 4 than the rotation axis of the swing force receiving member 39. Specifically, the reset force receiving member 40 comprises a fifth limiting portion 401, a fourth hole portion 402, a fifth connecting portion 403, and a second force receiving portion 272. The inner side of the driving side end cover 13 is provided with a second rotation shaft 139 extending along the Y direction, and the reset force receiving member 40 is sleeved on the second rotation shaft 139 through the fourth hole portion 402 and can swing around the second rotation shaft 139. The fifth limiting portion 401 is arranged at the X2 direction side of the reset force receiving member 40, and the fifth limiting portion 401 is a protruding structure protruding along the radial direction. The inner side of the driving side end cover 13 is provided with a limiting column 1310 protruding along the Y direction, and the limiting column 1310 is located on the swing path of the fifth limiting portion 401, and when the fifth limiting portion 401 abuts against the limiting column 1310 (the limiting column 1310 is located at the Z1 direction side of the fifth limiting portion 401), the swing movement of the reset force receiving member 40 is stopped. The second force receiving portion 272 is arranged at the Z2 direction end of the reset force receiving member 40 and protrudes from the Z2 direction end of the process cartridge, and is used to receive the action force of the separation control component 196R. The fifth connecting portion 403 is arranged at the Z1 direction end of the reset force receiving member 40, and the fifth connecting portion 403 comprises a hook-shaped structure and is used to connect one end of a reset elastic member 41. The inner side of the driving side end cover 13 is provided with a sixth connecting portion 1311, and the other end of the reset elastic member 41 is connected to the sixth connecting portion 1311. The reset elastic member 41 is preferably a tension spring and is used to apply an action force to the reset force receiving member 40 to reset it to the initial position. The reset elastic member 41 is constructed to keep the reset force receiving member 40 in the initial position where the fifth limiting portion 401 abuts against the limiting column 1310 when not subjected to other external forces. The swing path of the fifth limiting portion 401 of the reset force receiving member 40 overlaps with the swing path of the retaining protrusion 393 of the swing force receiving member 39, that is, the fifth limiting portion 401 can also abut against the retaining protrusion 393 to limit the swing force receiving member 39.

[0605] Referring to FIG. 116-119, FIG. 122, the transmission unit comprises a pushing rod 42, a pushing elastic member 43, a transmission rod 44, and a transmission elastic member 45. The pushing rod 42 is supported on the drum frame 11 along the Y direction, and the Y1 and Y2 direction ends of the drum frame 11 are provided with fixing blocks 114, and the fixing blocks 114 are provided with through holes supporting both ends of the pushing rod 42, and the pushing rod 42 can move along the Y direction. In the X direction, the pushing rod 42 is located at the X1 direction side of the first charging mechanism. The pushing rod 42 is provided with a second protrusion 421 protruding along the radial direction, and the second protrusion 421 can be arranged as an annular protrusion, and the second protrusion 421 is used to cooperate with the first protrusion 562 on the charging component support portion 56. The Y2 direction end of the pushing rod 42 is provided with a force receiving cone 422, and the force receiving cone 422 is a conical / tapered structure.

[0606] Referring to Figs. 117-118, the pushing elastic member 43 is sleeved on the pushing rod 42 and located between the fixed block 114 at the Y1 direction end and the second protrusion 421 arranged on the pushing rod 42 close to the Y1 direction end, the pushing elastic member 43 is configured to apply a force to the pushing rod 42 towards the Y2 direction, so that the pushing rod 42 is in a position close to the driving end. When the pushing rod 42 moves axially along the Y1 direction, the pushing elastic member 43 is compressed. The pushing elastic member 43 is preferably a compression spring.

[0607] Referring to Figs. 116, 119 and 122, the transmission rod 44 is slidingly arranged inside the driving side end cover 13, the transmission rod 44 includes a rack portion 441, a limiting protrusion 442, a receiving groove 443, a sliding groove 444 and a seventh connecting portion 445. The driving side end cover 13 is provided with a first sliding rail A115 matched with the sliding groove 444, the first sliding rail A115 is inclined relative to the X direction and the Z direction, and the transmission rod 44 is nested on the first sliding rail A115 through the sliding groove 444 and can move along the first sliding rail A115. Along the length direction of the transmission rod 44, the rack portion 441, the limiting protrusion 442, the receiving groove 443 and the seventh connecting portion 445 are arranged in sequence. The rack portion 441 is arranged on the Z2 direction end surface of the transmission rod 44, and the rack portion 441 is engaged with the gear portion 391 of the swinging force receiving member 39. The limiting protrusion 442 is protrudingly arranged on the Z2 direction end surface of the transmission rod 44, and the inside of the driving side end cover 13 is provided with a limiting buckle A1312, the limiting buckle A1312 is partially located below the transmission rod 44 and on the X2 direction side of the limiting protrusion 442, when the transmission rod 44 moves to the abutting position of the limiting protrusion 442 and the limiting buckle A1312, the movement of the transmission rod 44 is stopped. The buckle portion of the limiting buckle A1312 is buckled on the Y1 direction side surface of the transmission rod 44, which can prevent the transmission rod 44 from being separated from the driving side end cover 13. The receiving groove 443 is a groove recessed in the Y2 direction on the Y1 direction side surface of the transmission rod 44, the receiving groove 443 is used to cooperate with the stress cone 422 of the pushing rod 42, and the width of the receiving groove 443 gradually decreases along the Y2 direction, i.e. the groove walls on both sides of the sliding direction of the transmission rod 44 are guide inclined surfaces 4431. The seventh connecting portion 445 is arranged at one end of the transmission rod 44 away from the rack portion 441, and is used to connect with one end of the transmission elastic member 45. The transmission elastic member 45 is preferably a tension spring, and the other end of the transmission elastic member 45 is connected to the fourth connecting portion 1313 inside the driving side end cover 13, and the transmission elastic member 45 is configured to have a force to the transmission rod 44 moving towards the X2 and Z1 directions.

[0608] Referring to FIGS. 116-119 and 123, when the process cartridge is in the working state, the laser beam U of the image forming apparatus can irradiate the surface of the photosensitive drum 4, at this time, the push rod 42 is kept at the position closest to the driving end under the action of the push elastic member 43, the second protrusion 421 on the push rod 42 abuts against the first protrusion 562 of the charging member support portion 56, the entire first charging mechanism is pushed by the second protrusion 421 to the working position away from the laser entrance, (the position not shielding the laser beam U entering from the laser entrance), the swing elastic member 58 is in the state of being twisted and deformed, the force receiving cone 422 of the push rod 42 is accommodated in the accommodating groove 443, the retaining protrusion 393 of the swing force receiving member 39 abuts against the fifth limiting portion 401 of the reset force receiving member 40 (the Z2 direction end of the retaining protrusion 393 and the fifth limiting portion 401 abut against each other), the fifth limiting portion 401 abuts against the limiting column 1310 and is limited, the reset force receiving member 40 cannot rotate in the clockwise direction, and further the swing force receiving member 39 cannot continue to rotate counterclockwise, the transmission rod 44 is pulled to the position close to the process cartridge X1, Z2 direction end because the rack portion 441 and the gear portion 391 are engaged, and the transmission elastic member 45 is in the state of being stretched.

[0609] Referring to Figs. 124-125, when the image forming apparatus 500 does not need to perform the developing process, the separation control member 196R moves in the W41 direction, contacts the second force receiving portion 272 of the reset force receiving member 40, and pushes the reset force receiving member 40 to rotate counterclockwise, the reset elastic member 41 is stretched, the fifth limit portion 401 releases the restriction on the holding protrusion 393, the transmission lever 44 moves in the X2, Z1 direction end toward the process cartridge under the action of the tension of the transmission elastic member 45 along the first slide rail A115, the swing force receiving member 39 rotates counterclockwise due to the cooperation of the rack portion 441 and the gear portion 391, the force receiving cone 422 of the push lever 42 contacts the guide slope 4431 of the accommodation groove 443 and moves out of the accommodation groove 443 to abut on the surface of the transmission lever 44 in the Y1 direction, in the process, the push lever 42 is pushed to move toward the conductive end (Y1 direction end), the push elastic member 43 is compressed, the second protrusion 421 on the push lever 42 is disengaged from the abutment with the first protrusion 562 along with the movement of the push lever 42, that is, the pushing force of the second protrusion 421 on the charging member support portion 56 disappears, the swing elastic member 58 is deformed to recover the force to move the entire first charging mechanism in the X1 direction to the shielding position, shielding the laser beam U entering from the laser entrance, the laser beam U cannot irradiate the surface of the photosensitive drum 4. When the transmission lever 44 moves to the position where the limit protrusion 442 abuts on the limit buckle A1312, the movement of the transmission lever 44 is stopped, and the transmission lever 44 is kept in the position where the force receiving cone 422 abuts on the surface of the transmission lever 44, the second protrusion 421 has no pushing effect on the first protrusion 562, and the first charging mechanism is kept in the shielding position. Thereafter, the separation control member 196R returns to the intermediate position (no force application position), the reset force receiving member 40 returns to the initial position under the action of the reset elastic member 41, and the holding protrusion 393 of the swing force receiving member 39 abuts on the Z1 direction end of the fifth limit portion 401 of the reset force receiving member 40.

[0610] Referring to Figs. 116-119, 123, when the image forming apparatus 500 needs to perform the developing process again, the separation control member 196R moves to the W42 direction, contacts the first force receiving part 271 of the swing force receiving member 39 and pushes the swing force receiving member 39 to rotate clockwise, the retaining protrusion 393 pushes the reset force receiving member 40 to rotate counterclockwise and to pass the fifth limit part 401 downward, after the retaining protrusion 393 passes, the reset force receiving member 40 returns to the initial position under the action of the reset elastic member 41. When the swing force receiving member 39 rotates clockwise, the gear part 391 engages with the rack to pull the transmission rod 44 to move to the X1, Z2 direction end close to the process cartridge, the transmission elastic member 45 is stretched, the transmission rod 44 moves to the position where the accommodating groove 443 is opposite to the force receiving cone 422, the pushing rod 42 moves to the force receiving cone 422 into the accommodating groove 443 under the action of the pushing elastic member 43, when the pushing rod 42 moves along the Y2 direction, the second protrusion 421 contacts the first protrusion 562 and has a pushing force to the first protrusion 562 to move away from the laser entrance, so that the whole first charging mechanism is pushed away from the laser entrance to the working position, and the laser beam U can irradiate on the surface of the photosensitive drum 4. Thereafter, the separation control member 196R returns to the intermediate position (no force position), the retaining protrusion 393 of the swing force receiving member 39 abuts against the fifth limit part 401 of the reset force receiving member 40, and the position is kept, the whole transmission unit cannot continue to move, and the first charging mechanism is kept in the working position.

[0611] The process cartridge of the embodiment is provided with the movable first charging mechanism, and the photosensitive drum 4 is controlled to adsorb or not to adsorb the toner by controlling whether the first charging mechanism blocks the laser entrance, without separating the drum roller, so that the photosensitive drum 4 does not adsorb the toner when the process cartridge does not develop, and the deposition of the toner is avoided, thereby ensuring the developing quality and improving the developing stability.

[0612] Embodiment Seventeen

[0613] At present, there is a kind of process cartridge in the prior art, which is not provided with a drum roller separation mechanism, when such process cartridge is installed in the image forming apparatus to perform color developing work, the drum coupling 15 and the developing coupling 25 of the process cartridge will continuously receive driving force, so that the photosensitive drum 4 and the developing roller 6 will rotate all the time, when the process cartridge does not perform developing work but receives driving force, the developing roller 6 will continuously feed toner to the photosensitive drum 4, and the photosensitive drum 4 will transfer the developer to the transfer belt 112a (as shown in Fig. 1), so that unnecessary deposition of the developer on the transfer belt 112a will affect the subsequent developing quality, and even cause the image forming apparatus to report an error, which leads to a serious problem that the developing cannot be performed.

[0614] Referring to Figs. 126-130, to solve the above problems, the process cartridge of the present embodiment is configured such that when the process cartridge does not need to work, the developing unit 9 does not move relative to the drum unit 8, the developing roller 6 and the photosensitive drum 4 remain in contact, the photosensitive drum 4 transfers the developer to the transfer belt 112a, and the developer on the transfer belt 112a is cleaned by the transfer belt acting member 292, thereby ensuring the developing quality, the image forming apparatus does not report an error, and still works normally.

[0615] The process cartridge of the present embodiment is basically similar to that of Embodiment 1, and the difference mainly lies in that the developing unit 9 of the present embodiment comprises a force receiving part 28a and a transfer belt cleaning mechanism, the transfer belt cleaning mechanism comprises an acting guide 291a and a transfer belt acting member 292, wherein the force receiving part 28a constitutes the force receiving part, and the transfer belt cleaning mechanism constitutes the moving part.

[0616] Referring to Figs. 1 and 126, when the process cartridge does not need to work and the developing unit 9 receives the second acting force (separating force) from the image forming apparatus, the transfer belt acting member 292 can extend and contact the transfer belt 112a to clean the developer on the transfer belt 112a, at this time, the developing roller 6 remains in contact with the photosensitive drum 4, and at the same time, since the transfer belt acting member 292 contacts the transfer belt 112a and has a downward pressing force on the transfer belt 112a, the transfer belt 112a slightly moves downward away from the photosensitive drum 4, the contact area between the transfer belt 112a and the photosensitive drum 4 is reduced, and the deposition of the developer on the transfer belt 112a is reduced. It can be understood that the distance of the downward movement of the transfer belt acting member 292 and the size of the downward pressing force on the transfer belt 112a can be designed according to the needs of those skilled in the art; when the developing unit 9 receives the first acting force (contacting force) from the image forming apparatus, the transfer belt acting member 292 can retract and disengage from the transfer belt 112a, so that the transfer belt 112a moves upward to contact the photosensitive drum 4, the developer on the transfer belt 112a is normally developed, and the process cartridge works normally.

[0617] Referring to Fig. 128, the force receiving part 28a is provided with a first force receiving part 271 for receiving the first acting force (contacting force) and a second force receiving part 272 for receiving the second acting force (separating force), when the second force receiving part 272 receives the second acting force (separating force), the force receiving part 28a moves and drives the transfer belt acting member 292 to extend and contact the transfer belt 112a, when the first force receiving part 271 receives the first acting force (contacting force), the force receiving part 28a moves and drives the transfer belt acting member 292 to retract and disengage from the transfer belt 112a.

[0618] In the embodiment, the force receiving member 28a is swingable, and in other embodiments, the force receiving member 28a can be slidable or in other forms of movement. In the embodiment, the force receiving member 28a is swingably arranged on the developing frame 21, and the swing axis of the force receiving member 28a is parallel to the length direction of the process cartridge, i.e., parallel to the Y direction. Specifically, referring to FIG. 129, the developing frame 21 is provided with a first mounting shaft 211a extending along the Y direction, and the force receiving member 28a is rotatably mounted on the first mounting shaft 211a. The first force receiving portion 271 and the second force receiving portion 272 are protrusions in the radial direction of the force receiving member 28a.

[0619] Referring to FIG. 128, the force receiving member 28a is further provided with a third transmission portion 281 for driving the action guide 291a to move up and down (in the Z direction). The third transmission portion 281 is a rod-shaped member extending along the Y direction. Referring to FIG. 129, the developing frame 21 is provided with a first limiting hole 212a, which is arc-shaped, and the third transmission portion 281 passes through the first limiting hole 212a and is swingable in the first limiting hole 212a. The first limiting hole 212a is consistent with the swing track of the third transmission portion 281.

[0620] Referring to FIGS. 126-127, the bottom of the developing frame 21 is provided with an action groove 213a extending along the length direction of the process cartridge (the Y direction), and the two ends of the action groove 213a in the length direction are respectively provided with action rails 214a extending up and down. The action guide 291a has two, corresponding to the action rails 214a at the two ends of the action groove 213a, and is arranged to be movable up and down along the action rails 214a. Referring to FIG. 130, specifically, the two sides of the action guide 291a are provided with guide grooves 2911, which are engaged with the action rails 214a, so that the action guide 291a can slide along the action rails 214a. The action guide 291a is further provided with an action mounting hole 2912, and the two ends of the transfer belt action member 292 in the length direction are mounted in the action mounting hole 2912, so that the transfer belt action member 292 is accommodated in the action groove 213a when retracted.

[0621] The third transmission part 281 passes through the first limiting hole 212a and enters the action groove 213a, and is connected with the action guide 291a. The action guide 291a is provided with a second limiting hole 2913 matched with the third transmission part 281. The third transmission part 281 swings in the second limiting hole 2913, thereby driving the action guide 291a to move up and down, so that the transfer belt action part 292 can be extended or retracted. Specifically, the second limiting hole 2913 is a waist-shaped hole extending horizontally (specifically, extending along the X direction). The second limiting hole 2913 converts the swinging movement of the third transmission part 281 into the up-and-down movement of the action guide 291a. When the action guide 291a drives the transfer belt action part 292 to extend downward, the transfer belt action part 292 at least partially extends out of the action groove 213a and contacts the transfer belt 112a, thereby cleaning the developer on the transfer belt 112a. It can be understood that the force receiving part 28a is not arranged at the Y1 end of the process cartridge Y1, and therefore the action guide 291a arranged at the Y1 end of the action groove 213a can not be provided with the second limiting hole 2913.

[0622] In the embodiment, the transfer belt action part 292 is a cleaning roller which is rotatably arranged in the circular action mounting hole 2912. In a variant of the embodiment, referring to FIGS. 131-132, the transfer belt action part 292 is a cleaning brush which is fixedly arranged in the square action mounting hole 2912.

[0623] The specific working principle of the process cartridge in the embodiment is as follows:

[0624] When the process cartridge does not need to work, the separation control part 196R of the image forming apparatus outputs a second acting force (separation force) to the second force receiving part 272, so that the force receiving part 28a rotates counterclockwise R1 from the direction of Y2 to Y1. The third transmission part 281 swings from the obliquely upper part to the obliquely lower part of the first limiting hole 212a, that is, the third transmission part 281 moves from X2 to X1, and at the same time moves downward from Z1 to Z2. The part of the third transmission part 281 inserted into the second limiting hole 2913 moves from X2 to X1 in the second limiting hole 2913, and at the same time drives the action guide 291a to move downward from Z1 to Z2 on the action guide rail 214a. The transfer belt action part 292 mounted on the action guide 291a extends downward and at least partially extends out of the action groove 213a to contact the transfer belt 112a. In the case that the developing roller 6 and the photosensitive drum 4 keep in contact, the developer on the transfer belt 112a is completely cleaned.

[0625] When the process cartridge needs to work, the separation control component 196R of the image forming apparatus outputs the first acting force (contact force) to the first force receiving part 271, so that the force receiving part 28a rotates in the clockwise direction R2 from the direction looking from Y2 to Y1, the third transmission part 281 swings from the obliquely lower part to the obliquely upper part of the first limiting hole 212a, that is, the third transmission part 281 moves from X1 to X2 direction, and at the same time, moves upward from Z2 to Z1 direction, the part of the third transmission part 281 inserted into the second limiting hole 2913 moves from X1 to X2 direction in the second limiting hole 2913, and at the same time, drives the acting guide 291a to move upward from Z2 to Z1 direction on the acting guide rail 214a, the transfer belt acting component 292 installed on the acting guide 291a retracts upward, and at least partially returns into the acting groove 213a, and is out of contact with the transfer belt 112a, the developer is normally developed on the transfer belt 112a, and the process cartridge works normally.

[0626] When the process cartridge of the embodiment does not need to work, the transfer belt acting component is driven by the second acting force (separation force) of the image forming apparatus to extend out to clean the developer on the transfer belt, prevent unnecessary developer from depositing on the transfer belt, affect the developing quality, and cause the image forming apparatus to report an error, and when the process cartridge needs to work, the transfer belt acting component retracts under the action of the first acting force (contact force) and is out of contact with the transfer belt, and the process cartridge works normally.

[0627] In some variant embodiments, when the developing unit receives the second acting force (separation force) from the image forming apparatus, the transfer belt acting component 292 can extend out and apply pressure to the transfer belt 112a, so that the contact area between the photosensitive drum 4 and the transfer belt 112a is reduced to 0, that is, the photosensitive drum 4 is out of contact with the transfer belt 112a, at this time, the developer will not deposit on the transfer belt 112a through the photosensitive drum 4, preventing the image forming apparatus from reporting an error, in this case, the transfer belt acting component 292 can be provided without cleaning function, the transfer belt acting component 292 can be simply provided as a rotating roller (for example, rotatably provided on the acting guide 291a) in contact with the transfer belt 112a or a non-rotating component (for example, fixedly provided on the acting guide 291a), as long as the acting force is applied to the transfer belt 112a to make the photosensitive drum 4 out of contact with the transfer belt 112a, without the need for cleaning function. The transfer belt acting component 292 can continue to be provided with cleaning function to clean the developer accidentally falling on the transfer belt 112a.

[0628] In other variant embodiments, a separate transfer belt cleaning member can be provided outside the transfer belt acting member 292, i.e., a transfer belt acting member 292 that exerts a force on the transfer belt 112a and a transfer belt cleaning member that cleans the transfer belt 112a are provided at the same time, and after the transfer belt acting member 292 exerts a force on the transfer belt 112a, the transfer belt acting member 292 can be such that the photosensitive drum 4 continues to be in contact with the transfer belt 112a, but the contact area is reduced, or such that the photosensitive drum 4 is not in contact with the transfer belt 112a, i.e., the contact area is reduced to 0.

[0629] EIGHTEENTH EMBODIMENT

[0630] Referring to FIGS. 133-136, the present application also proposes a process cartridge P, which is different from the above-mentioned embodiments in that the process cartridge P is provided in a structure that the drum frame 11 and the developing frame 21 are fixedly assembled, which can be understood as that the drum frame 11 and the developing frame 21 do not need to be separated or cannot reach a separated state; that is, the drum frame 11 and the developing frame 21 can be formed in a fixed connection or an integral molding manner to constitute a carrier capable of carrying a developing functional component. In the present embodiment, the process cartridge P can include a process cartridge housing P3 for mounting the developing functional components required by the process cartridge, and at least the photosensitive drum 4 and the second charging mechanism 81 (the second charging mechanism 81 as a moving piece) movably arranged in the process cartridge housing P3, the second charging mechanism 81 being capable of transferring uniform layered static electricity on the photosensitive drum 4 by mutual rotation with the photosensitive drum 4, and the photosensitive drum 4 being capable of forming a latent electrostatic image required for development on the surface of the photosensitive drum 4 according to the development information carried in the laser beam U after receiving the laser beam U emitted by the laser scanning unit in the image forming apparatus, and being capable of adsorbing toner due to the potential rise on the surface of the photosensitive drum 4, thereby enabling the image forming apparatus to smoothly complete the development function. The technical key point of the present application lies in that the process cartridge housing P3 is provided with a displacement space 800 (specifically provided on the drum frame 11) for displacement of the second charging mechanism 81, and the displacement space 800 has two positions corresponding to the photosensitive drum 4 and the laser beam U irradiation path, i.e., a first moving target position D1 and a second moving target position D2, wherein the first moving target position D1 corresponds to the photosensitive drum 4, and it needs to be explained that when the second charging mechanism 81 is located at the first moving target position D1, the second charging mechanism 81 can be in contact with the photosensitive drum 4 to transfer static electricity to the surface of the photosensitive drum 4, and the laser beam U emitted by the laser scanning unit can also irradiate on the photosensitive drum 4 to form a latent electrostatic image (i.e., the first moving target position D1 is a working position); and the second moving target position D2 corresponds to the laser beam U irradiation path, and it needs to be explained that when the second charging mechanism 81 moves to the second moving target position D2, the second charging mechanism 81 is in a separated state with the photosensitive drum 4, thereby stopping the transfer of static electricity to the surface of the photosensitive drum 4, and the second charging mechanism 81 located at the second moving target position D2 can block the laser beam U that should irradiate on the photosensitive drum 4, thereby blocking the laser beam U to change the static electricity remaining on the photosensitive drum 4 into a latent electrostatic image (i.e., the second moving target position D2 is a blocking position). In the present embodiment, a transmission mechanism 5A (the transmission mechanism 5A as a force receiving portion) is further provided between the process cartridge housing P3 and the second charging mechanism 81, so that the transmission mechanism 5A can realize controllable movement (i.e., X1-X2 direction movement) of the second charging mechanism 81 in the displacement space 800, and the transmission mechanism 5A is connected between the developing unit 9 and the second charging mechanism.Since the second charging mechanism 81 is in a separated state from the photosensitive drum 4, and the laser beam U that should be irradiated on the photosensitive drum 4 is shielded, even if the drum coupling 15 on the photosensitive drum 4 still maintains a rotating state of receiving driving force, since the second charging mechanism 81 cannot continuously supply electrostatic charges to the surface of the photosensitive drum 4, the laser beam U irradiated on the second charging mechanism 81 cannot form an electrostatic latent image on the photosensitive drum 4, so that the photosensitive drum 4 loses the function of adsorbing toner through the principle of electrostatic adsorption, effectively avoiding the problem that after the image forming device ends the developing work, the photosensitive drum 4 continuously adsorbs the developer and transfers the developer to the transfer belt 112a to cause unnecessary developer deposition, affecting the subsequent developing quality, and causing the image forming device to report an error and cannot develop.

[0631] In the present embodiment, the inclination angle based on the X1 direction and the X2 direction can be set on the first moving target position D1 and the second moving target position D2, and the inclination angle is an acute angle, so that the height of the second charging mechanism 81 can be changed during movement, and the second charging mechanism 81 is in a separated state or a contact state with the photosensitive drum 4. It needs to be explained that the second moving target position D2 is in the X1 direction of the first moving target position D1, and the first moving target position D1 is in the X2 direction of the second moving target position D2.

[0632] In some embodiments, the acting component and the transmission mechanism 5A can be used in cooperation, so as to drive the transmission mechanism 5A to transmit the acting force of the acting component to the second charging mechanism 81, so that the second charging mechanism 81 can move to the target position in the accommodation space 800, that is, the first moving target position D1 or the second moving target position D2 defined in the present embodiment; since the image forming device is provided with the acting component to drive the transmission mechanism 5A to drive the second charging mechanism 81 to move in the accommodation space 800, the acting component and the transmission mechanism 5A can be arranged at any position inside the image forming device, as long as the second charging mechanism 81 can be driven to move in the accommodation space 800.

[0633] Referring to FIG. 137, in the preferred embodiment of the present application, the acting member for cooperating with the transmission mechanism 5A can adopt the developing separation control unit 195R in the above-mentioned embodiment (or the part of the image forming apparatus transfer belt frame and the like capable of cooperating with the transmission mechanism 5A) to transmit the acting force of the separation control member 196R on the developing separation control unit 195R to the second charging mechanism 81 through the transmission mechanism 5A, so that after the second charging mechanism 81 is subjected to the acting force of the separation control member 196R, the second charging mechanism 81 can move in the displacement space 800 to reach the purpose of reciprocating to the first moving target position D1 or the second moving target position D2, and the separation control member 196R is located below (Z2 direction) the transmission mechanism 5A. In the present embodiment, the ...

Claims

1. A processing box for detachable mounting in a main assembly of an image forming apparatus, the main assembly being provided with a separation control component, characterized in that, The processing cartridge comprises a drum unit, a developing unit, a developing coupling, and a force receiving member; The drum unit comprises a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction; The developing unit comprises a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum; The developing coupling is arranged on the developing unit, for receiving a rotating driving force and transmitting the rotating driving force to the developing roller; The force receiving member is located on one side of the developing unit, the force receiving member is provided with a separation force receiving surface and a separation abutting surface intersecting with the separation force receiving surface; The separation force receiving surface is capable of receiving an acting force of the separation control component to drive the developing unit to move from the developing position to the spaced position; The separation abutting surface is capable of abutting with the separation control component to keep the developing unit in the spaced position.

2. A process cartridge, characterized by, The processing cartridge comprises a drum unit, a developing unit, and a force receiving member; The drum unit comprises a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction; The developing unit comprises a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum; The force receiving member is located on one side of the developing unit, the force receiving member is provided with a separation force receiving surface and a separation abutting surface intersecting with the separation force receiving surface.

3. The process cartridge according to claim 1 or 2, wherein, The separation force receiving surface is capable of receiving an acting force of the separation control component to drive the developing unit to move from the developing position to the spaced position; 4. The process cartridge of claim 3 wherein, The separation abutting surface is capable of abutting with the separation control component to keep the developing unit in the spaced position.

5. The process cartridge of claim 3 wherein, The processing cartridge comprises a drum unit, a developing unit, and a force receiving member; 6. The process cartridge of claim 3 wherein, The drum unit comprises a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction; 7. The process cartridge of claim 3 wherein, The developing unit comprises a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum; 8. The process cartridge of claim 3 wherein, The force receiving member is located on one side of the developing unit, the force receiving member is provided with a separation force receiving surface and a separation abutting surface intersecting with the separation force receiving surface.

9. The process cartridge of claim 3 wherein, The separation force receiving surface is capable of receiving an acting force of the separation control component to drive the developing unit to move from the developing position to the spaced position; 10. The process cartridge of claim 3 wherein, The separation abutting surface is capable of abutting with the separation control component to keep the developing unit in the spaced position. The processing cartridge comprises a drum unit, a developing unit, and a force receiving member; The drum unit comprises a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction; The developing unit comprises a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum; The force receiving member is located on one side of the developing unit, the force receiving member is provided with a separation force receiving surface and a separation abutting surface intersecting with the separation force receiving surface. The separation force receiving surface is capable of receiving an acting force of the separation control component to drive the developing unit to move from the developing position to the spaced position; The separation abutting surface is capable of abutting with the separation control component to keep the developing unit in the spaced position. The processing cartridge comprises a drum unit, a developing unit, and a force receiving member; The drum unit comprises a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction; The developing unit comprises a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum; The force receiving member is located on one side of the developing unit, the force receiving member is provided with a separation force receiving surface and a separation abutting surface intersecting with the separation force receiving surface. The separation force receiving surface is capable of receiving an acting force of the separation control component to drive the developing unit to move from the developing position to the spaced position; The separation abutting surface is capable of abutting with the separation control component to keep the developing unit in the spaced position.

11. The process cartridge of claim 2, wherein, The processing cartridge is detachably installed in a main assembly of the image forming apparatus, the main assembly is provided with a separation control component, when the separation abutting surface abuts against the separation control component, the acting force between the two causes the developing unit to be kept in the interval position.

12. The process cartridge of any one of claims 1-2, 4-11, wherein, Further comprising a first clamping part provided on the drum unit and a second clamping part provided on the developing unit; When the developing unit moves between the developing position and the interval position, the first clamping part cooperates with the second clamping part to cause the developing unit to move axially in the first direction.

13. The process cartridge of claim 12, wherein, Further comprising a third elastic member provided on the conductive end of the processing cartridge, the third elastic member is used to provide the developing unit with an acting force in the first direction towards the driving end.

14. The process cartridge of claim 13, wherein, The processing cartridge further comprises a first elastic member provided between the developing unit and the drum unit, the first elastic member is used to provide the developing unit with an acting force to move towards the developing position.

15. The process cartridge of claim 14, wherein, The first clamping part comprises a central protrusion and a guide channel surrounding the central protrusion; The second clamping part is a protruding column structure, at least part of which is embedded in the guide channel and can move in the guide channel.

16. The process cartridge of claim 15, wherein, When the separation force receiving surface receives the separation force of the separation control component, the developing unit moves in the direction of the interval position and moves axially in the first direction towards the conductive end, and the third elastic member is compressed.

17. The process cartridge of claim 16 wherein, After the separation control component does not apply force to the separation force receiving surface, the developing unit moves in the direction of the developing position and moves axially in the first direction towards the driving end under the action of the first elastic member and the third elastic member.

18. The process cartridge of claim 17, wherein, The acting force of the third elastic member causes the separation abutting surface to abut against the separation control component, the second clamping part abuts against one side of the central protrusion, and the developing unit is kept in the interval position.

19. The process cartridge of claim 18 wherein, After the separation control component and the separation abutting surface are disengaged, the acting force of the third elastic member and the first elastic member causes the developing unit to move axially in the first direction towards the driving end and in the direction of the developing position, and the second clamping part abuts against the other side after passing through the intersection of one side and the other side of the central protrusion.

20. The process cartridge of any one of claims 1-2, 4-11, 13-19, further characterized by, The force receiving member is fixedly provided on the developing unit.

21. The process cartridge of any one of claims 1-2, 4-11, 13-19, further characterized by, The force receiving member is slidingly provided on the developing unit, and the force receiving member can slide relative to the developing unit in the second direction.

22. The process cartridge of claim 21, wherein, An eleventh elastic member is provided between the force receiving member and the developing unit, and the eleventh elastic member is configured to have an acting force on the force receiving member in the second direction towards the drum unit.

23. The process cartridge of claim 22, wherein, The developing unit is provided with a fourth abutting part and a second abutting part; when the force receiving member abuts against the fourth abutting part, the movement of the force receiving member in the second direction towards the drum unit is limited; when the force receiving member abuts against the second abutting part, the movement of the force receiving member in the second direction away from the drum unit is limited.

24. The process cartridge of claim 23, wherein, The force receiving member is provided with a third limiting part, and the third limiting part is located at one end of the separation abutting surface away from the drum unit in the second direction.

25. The process cartridge of claim 24, wherein, When the separation force receiving surface receives the separation force of the separation control component to move in a direction away from the drum unit to a position where the force receiving member abuts against the second abutting portion, the force receiving member drives the developing unit to move in a direction to the spaced position and moves in the first direction to the electrically conductive end.

26. The process cartridge of claim 25, wherein, When the separation force receiving surface no longer receives the separation force from the separation control component, the force receiving member moves in a direction to the drum unit under the action of the eleventh elastic member, and the movement of the force receiving member in the direction to the drum unit is limited when the separation control component abuts against the third limiting portion.

27. The process cartridge of claim 26 wherein, The third elastic member provided at the electrically conductive end of the process cartridge applies an action force to the developing unit in a direction to the driving end, so that the separation abutting surface on the force receiving member abuts against the separation control component, and the friction force between the force receiving member and the separation control component enables the force receiving member to move in a direction to the drum unit along with the separation control component to abut against the fourth abutting portion, and the developing unit is kept in the spaced position under the action of the friction force.

28. The process cartridge of any one of claims 13-19, 22-27, wherein, When the developing unit moves axially in the first direction, the developing coupling moves with the developing unit relative to the drum frame, or the developing coupling does not move relative to the drum frame.

29. The process cartridge of claim 12, wherein, The first clamping portion and the second clamping portion are provided at the electrically conductive end of the process cartridge.

30. The process cartridge of any one of claims 1-2, 4-11, 13-19, 22-27, 29, wherein, The drum unit is provided with a shielding area, the shielding area has an overlapping portion with the separation force receiving surface and the separation abutting surface in the first direction; the shielding area is provided with a first abutting portion extending to the electrically conductive end of the process cartridge in the first direction; when the separation abutting surface abuts against one side of the separation control component in the first direction, the first abutting portion abuts against the other side of the separation control component in the first direction.

31. A process cartridge for detachably mounting in a main assembly of an image forming apparatus, said main assembly being provided with a separation control member, characterized by comprising: The process cartridge comprises a drum unit, a developing unit, a developing coupling, a force receiving member, a first clamping portion, a second clamping portion and a third elastic member; The drum unit comprises a drum frame and a photosensitive drum rotatably provided on the drum frame, and an axis of the photosensitive drum extends in the first direction; The developing unit comprises a developing frame and a developing roller rotatably provided on the developing frame, and an axis of the developing roller extends in the first direction; the developing unit is oppositely arranged to the drum unit in the second direction, and the developing unit is capable of moving relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller contacts the photosensitive drum, and in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum; The developing coupling is provided on the developing unit, and is used to receive a rotating driving force and transmit the rotating driving force to the developing roller; The force receiving member is fixedly provided on the developing unit; When the force receiving member receives the action force of the separation control component to move the developing unit from the developing position to the spaced position, the first clamping portion and the second clamping portion cooperate to enable the developing unit to further move in the first direction to the electrically conductive end. The third elastic member is arranged at the conductive end of the process cartridge and is configured to provide a force to the developing unit in a direction of the driving end of the process cartridge in the first direction.

32. The process cartridge of claim 31, wherein, The first clamping portion is arranged on the drum unit, and the second clamping portion is arranged on the developing unit.

33. The process cartridge of claim 31, wherein, The force receiving member only receives a separation force for moving the developing unit to the spaced position.

34. The process cartridge of claim 31, wherein, The process cartridge further comprises a first elastic member arranged between the developing unit and the drum unit, and the first elastic member is configured to provide a force to the developing unit for moving the developing unit to the developing position.

35. The process cartridge of claim 32, wherein, The first clamping portion is provided with a first positioning portion and a second positioning portion, and the second clamping portion moves between the first positioning portion and the second positioning portion when the developing unit moves between the developing position and the spaced position relative to the drum unit.

36. The process cartridge of claim 35, wherein, The force receiving member is provided with a second force receiving portion, and when the second force receiving portion receives the separation force of the separation control component, the developing unit moves to the spaced position and moves to the conductive end in the first direction, and the third elastic member is compressed and deformed. When the second force receiving portion is out of contact with the separation control component and no longer receives the separation force, the third elastic member is deformed to recover, the developing unit moves to the driving end in the first direction, the second clamping portion abuts against the first positioning portion, and the developing unit is kept in the spaced position.

37. The process cartridge of claim 36 wherein, The force receiving member is provided with a first force receiving portion, and when the first force receiving portion receives the contact force of the separation control component, the developing unit moves to the developing position and moves to the conductive end in the first direction, and the third elastic member is compressed and deformed.

38. The process cartridge of claim 37, wherein, When the first force receiving portion is out of contact with the separation control component and no longer receives the contact force, the third elastic member is deformed to recover, the developing unit moves to the driving end in the first direction, the second clamping portion abuts against the second positioning portion, and the developing unit is kept in the developing position.

39. The process cartridge of claim 32, wherein, The first force receiving portion is a surface of the force receiving member on a side of the force receiving member away from the drum unit in the second direction, and the second force receiving portion is a surface of the force receiving member on a side of the force receiving member toward the drum unit in the second direction. The drum unit comprises a driving side end cover, the driving side end cover is provided with a first rotating hole, and the first clamping portion is arranged on an inner wall of the first rotating hole.

40. The process cartridge of claim 39, wherein, The first clamping portion is a groove extending obliquely relative to the first direction, and the second clamping portion is a protrusion extending obliquely relative to the first direction, and the second clamping portion is embedded in the first clamping portion. The first clamping portion comprises a first guide surface and a second guide surface arranged opposite in a circumferential direction.

41. The process cartridge of claim 40, wherein, The second clamping portion comprises a first guided surface and a second guided surface. When the force receiving member receives the separation force of the separation control component, the developing unit moves to the spaced position and moves to the conductive end in the first direction, the third elastic member is compressed and deformed, the first guided surface abuts against the first guide surface and slides relative to the first guide surface. When the separation control component moves to the limit position, the third elastic member is deformed to restore, the developing unit moves to the driving end, the force receiving member abuts against the separation control component, the friction between the two keeps the force receiving member in the position of abutting against the separation control component, and the second guided surface abuts against the second guide surface, so that the developing unit is kept in the interval position.

42. The process cartridge of claim 41, wherein, When the separation control component moves away from the abutment with the force receiving member, the third elastic member is deformed to restore, the developing unit moves to the driving end and moves to the developing position, and the second clamping part moves from the position of abutting against the second guided surface to the position of abutting against the first guided surface.

43. The process cartridge of claim 32, wherein, The first clamping part comprises a central protrusion and a guide channel surrounding the central protrusion; The second clamping part is a protruding column structure, at least partially embedded in the guide channel and movable in the guide channel.

44. The process cartridge of claim 43, wherein, The central protrusion comprises a fourth side surface inclined relative to the axial direction of the developing unit, and when the developing unit is in the interval position, the second clamping part abuts against the fourth side surface.

45. The process cartridge of any one of claims 39-44, wherein, The force receiving member comprises a separation abutment surface and a separation force receiving surface, the separation force receiving surface is an inclined surface inclined relative to the first direction; and the separation abutment surface is connected to the side of the separation force receiving surface close to the drum unit.

46. The process cartridge of claim 45, wherein, When the separation force receiving surface receives the separation force of the separation control component, the developing unit moves in the direction of the interval position and moves axially in the first direction to the conductive end, and the third elastic member is compressed.

47. The process cartridge of claim 46, wherein, When the separation control component does not apply the separation force to the separation force receiving surface, the developing unit moves in the direction of the developing position and moves axially in the first direction to the driving end under the action of the first elastic member and the third elastic member.

48. The process cartridge of claim 33, wherein, The force receiving member comprises a first inclined surface and a second inclined surface, the intersection of the first inclined surface and the second inclined surface is a second force receiving part, and the second force receiving part abuts against the separation control component to receive the action force.

49. The process cartridge of claim 48 wherein, The force receiving member comprises a protruding part protruding from the surface of the force receiving member facing the drum unit; The first inclined surface and the second inclined surface are arranged on the protruding part; The first inclined surface and the second inclined surface are both inclined and extended in the direction close to the drum unit, and the slopes of the first inclined surface and the second inclined surface are different.

50. The process cartridge of any one of claims 48-49, wherein, When the second force receiving part receives the separation force of the separation control component to move the developing unit from the developing position to the interval position, the second force receiving part moves along the surface abutting against the separation control component.

51. The process cartridge of claim 50 wherein, When the developing unit moves to the interval position, the force receiving member has a reaction force on the separation control component; The direction of the reaction force is perpendicular to the line N2 connecting the rotation center of the developing unit and the contact point of the separation control component and the second force receiving part; During the movement of the developing unit to the interval position, the direction of the reaction force is above the line N3 connecting the rotation point of the separation control component and the contact point.

52. A process cartridge for detachably mounting to a main assembly of an image forming apparatus, characterized by comprising: The processing cartridge comprises a drum unit, a developing unit, a developing coupling, a first force receiving part and a second force receiving part; The drum unit includes a drum frame, a photosensitive drum rotatably disposed on the drum frame, and a charging member disposed on the drum frame for charging the photosensitive drum, an axis of the photosensitive drum extending in a first direction; the developing unit includes a developing frame and a developing roller rotatably disposed on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely disposed to the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum; The developing coupling is provided in the developing unit for receiving a rotational driving force and transmitting the rotational driving force to the developing roller; The first force receiving part and the second force receiving part are provided in the developing unit, the first force receiving part is used for receiving a contact force for moving the developing unit to the developing position, and the second force receiving part is used for receiving a separation force for moving the developing unit to the spaced position; In the first direction, a line between a center of the charging member and a rotation center of the photosensitive drum is N10, the line N10 forms two intersection points with a surface of the photosensitive drum, a far intersection point MX1 is farther away from the center of the charging member among the two intersection points, a tangent line N11 of the surface of the photosensitive drum is drawn through the far intersection point MX1, and the center of the charging member and the rotation center of the photosensitive drum are on the same side of the tangent line N11 as the first force receiving part and / or the second force receiving part.

53. The process cartridge of claim 52 wherein, In the first direction, a line between a rotation center of the photosensitive drum and a rotation center of the developing coupling is N0, an angle between the line N10 and the line N0 is α, and a value of α is in a range of 25°≤α≤45°.

54. The process cartridge of any one of claims 52-53, wherein, The charging member is a corona wire.

55. The process cartridge of claim 52 wherein, The drum unit further includes a cleaning blade fixedly disposed on the drum frame, the cleaning blade being in contact with the photosensitive drum to clean residual toner on a surface of the photosensitive drum. The charging member includes a charging support part and a conductive sponge disposed on the charging support part, the conductive sponge being in contact with the photosensitive drum, and the charging support part at least partially abutting the cleaning blade.

56. The process cartridge of claim 55 wherein, The charging support part is fixedly disposed on the drum frame, and the charging support part includes a bottom plate and a vertical plate cross-disposed.

57. The process cartridge of any one of claims 55-56, wherein, A conductive member is further included for receiving and transmitting a voltage of the image forming apparatus; The charging member includes a conductive part in contact with the conductive member, the conductive part being made of a conductive material.

58. The process cartridge of claim 57, wherein, The conductive part is the conductive sponge, or the conductive part is a part of the charging support part in contact with the conductive member, or the conductive part is the entire charging support part.

59. A process cartridge detachably mountable to a main assembly of an image forming apparatus, characterized by comprising: The drum unit includes a drum frame and a photosensitive drum rotatably disposed on the drum frame, an axis of the photosensitive drum extending in a first direction; ​ The developing unit includes a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in the second direction and is movable relative to the drum unit around a rotation center between a developing position where the developing roller is in contact with the photosensitive drum and a spaced position where the developing roller is at least partially spaced apart from the photosensitive drum; A first elastic member is arranged between the drum unit and the developing unit and is capable of pushing the developing unit in a direction from the spaced position towards the developing position; In the developing position, a gravity moment around the rotation center generated by the self-weight of the developing unit is in the same direction as an elastic moment around the rotation center generated by the first elastic member; In the spaced position, the gravity moment around the rotation center generated by the self-weight of the developing unit is in the opposite direction to the elastic moment around the rotation center generated by the first elastic member.

60. The process cartridge of claim 59 wherein, The developing unit includes a charging member movably arranged on the developing frame, the charging member being located on a side of the developing unit close to the drum unit in the second direction and being capable of being in contact with the photosensitive drum to charge the photosensitive drum.

61. The process cartridge of claim 60 wherein, The charging member is movably connected to the developing frame by a support frame.

62. The process cartridge of claim 61 wherein, One end of the support frame is provided with a second pivot joint rotatably matched with the first pivot joint.

63. The process cartridge of claim 62 wherein, The other end of the support frame is provided with an engaging portion connected with a shaft of the charging member, the engaging portion being a claw structure.

64. The process cartridge of claim 63 wherein, A force applying elastic member is further included, the force applying elastic member being in abutment with the support frame and the developing frame and being used to apply an acting force on the charging member to make the charging member tightly abut against the photosensitive drum.

65. The process cartridge of claim 59 wherein, The developing frame is provided with a counterweight, the counterweight being located on a side of the developing frame close to the drum unit in the second direction.

66. The process cartridge of claim 65 wherein, In the spaced position, at least a portion of the developing unit abuts against the drum unit.

67. The process cartridge of any one of claims 59-66, wherein, In the developing position, a gravity center of the developing unit is located on a side of a vertical line of the rotation center of the developing unit away from the drum unit in the first direction; in the spaced position, the gravity center of the developing unit is located on a side of the vertical line of the rotation center of the developing unit close to the drum unit.

68. The process cartridge of claim 67 wherein, The gravity moment around the rotation center generated by the self-weight of the developing unit is greater than the elastic moment around the rotation center generated by the first elastic member.

69. The process cartridge of claim 68 wherein, When the developing unit receives a contact force of the image forming apparatus, a sum of a moment of the contact force and a moment of the elastic force of the first elastic member is greater than the gravity moment around the rotation center generated by the self-weight of the developing unit.

70. A process cartridge detachably mounted to a main assembly of an image forming apparatus, characterized by comprising: The developing unit includes a developing frame and a developing roller rotatably arranged on the developing frame, an axis of the developing roller extending in the first direction; the developing unit is oppositely arranged with the drum unit in the second direction and is movable relative to the drum unit around a rotation center between a developing position where the developing roller is in contact with the photosensitive drum and a spaced position where the developing roller is at least partially spaced apart from the photosensitive drum; In the developing position, a gravity moment around the rotation center generated by the self-weight of the developing unit is in the same direction as an elastic moment around the rotation center generated by the first elastic member; In the spaced position, the gravity moment around the rotation center generated by the self-weight of the developing unit is in the opposite direction to the elastic moment around the rotation center generated by the first elastic member. The developing unit includes a charging member movably arranged on the developing frame, the charging member being located on a side of the developing unit close to the drum unit in the second direction and being capable of being in contact with the photosensitive drum to charge the photosensitive drum. The charging member is movably connected to the developing frame by a support frame. One end of the support frame is provided with a second pivot joint rotatably matched with the first pivot joint. The other end of the support frame is provided with an engaging portion connected with a shaft of the charging member, the engaging portion being a claw structure. A force applying elastic member is further included, the force applying elastic member being in abutment with the support frame and the developing frame and being used to apply an acting force on the charging member to make the charging member tightly abut against the photosensitive drum. The developing frame is provided with a counterweight, the counterweight being located on a side of the developing frame close to the drum unit in the second direction. In the spaced position, at least a portion of the developing unit abuts against the drum unit. In the developing position, a gravity center of the developing unit is located on a side of a vertical line of the rotation center of the developing unit away from the drum unit in the first direction; in the spaced position, the gravity center of the developing unit is located on a side of the vertical line of the rotation center of the developing unit close to the drum unit. The gravity moment around the rotation center generated by the self-weight of the developing unit is greater than the elastic moment around the rotation center generated by the first elastic member. When the developing unit receives a contact force of the image forming apparatus, a sum of a moment of the contact force and a moment of the elastic force of the first elastic member is greater than the gravity moment around the rotation center generated by the self-weight of the developing unit. A force receiving portion for receiving a force of the image forming apparatus to move a movable member provided on the drum unit or the developing unit.

71. The process cartridge of claim 70 wherein, The image forming apparatus includes a transfer belt cooperating with the photosensitive drum, and the movable member includes a transfer belt acting member; When the force receiving portion receives a second force from the image forming apparatus, the transfer belt acting member is capable of extending and contacting the transfer belt; When the force receiving portion receives a first force from the image forming apparatus, the transfer belt acting member is capable of retracting and disengaging from the transfer belt.

72. The process cartridge of claim 71, wherein, The force receiving portion includes a force receiving member provided with a first force receiving portion for receiving the first force and a second force receiving portion for receiving the second force, when the second force receiving portion receives the second force, the force receiving member moves and drives the transfer belt acting member to extend and contact the transfer belt, when the first force receiving portion receives the first force, the force receiving member moves and drives the transfer belt acting member to retract and disengage from the transfer belt.

73. The process cartridge of any one of claims 71-72, wherein, The transfer belt acting member is capable of extending and contacting the transfer belt to clean the developer on the transfer belt; Alternatively, the transfer belt acting member is capable of extending and contacting the transfer belt and applying pressure to the transfer belt, so that the contact area of the photosensitive drum with the transfer belt is reduced.

74. The process cartridge of claim 70 wherein, The movable member is a first charging mechanism movably provided on the drum frame, and the first charging mechanism is capable of moving between a working position and a shielding position.

75. The process cartridge of claim 74, wherein, Further comprising a transmission unit in transmission connection with the first charging mechanism, the transmission unit is used to control the movement of the first charging mechanism; The force receiving portion is in transmission connection with the transmission unit to control the movement of the transmission unit.

76. The process cartridge of claim 70 wherein, The movable member is a second charging mechanism movably provided on the drum frame, and the drum frame is provided with a space for the movement of the second charging mechanism; The space has a first movement target position and a second movement target position; The force receiving portion includes a transmission mechanism connected between the developing unit and the second charging mechanism, used to drive the second charging mechanism to move in the space; When the transmission mechanism drives the second charging mechanism to move from the first movement target position to the second movement target position, the second charging mechanism is in a separated state from the photosensitive drum, and the second charging mechanism can shield the laser beam that should be irradiated on the photosensitive drum.

77. The process cartridge of claim 76, wherein, The transmission mechanism includes: A first transmission member in rotational connection with the developing frame, capable of receiving the force of the image forming apparatus to rotate; A second transmission member having a first end and a second end, the first end is connected with the first transmission member, and the second end is connected with the second charging mechanism; The first transmission member drives the second end to drive the second charging mechanism to move in the space by applying a force on the first end.

78. The process cartridge of claim 76, wherein, The space is provided with a first sliding structure; The first sliding structure extends along a direction capable of reaching the first and second target positions, so that the second charging mechanism is limited to slide in the space.

79. The process cartridge of claim 78, wherein, The second charging mechanism comprises a charging roller support and a charging roller arranged on the charging roller support. The charging roller support is in sliding cooperation with the first sliding structure through a sliding block part; The charging roller support is in sliding connection with the transmission mechanism through a second sliding structure arranged on the charging roller support.

80. The process cartridge of claim 70 wherein, The drum unit further comprises a drum coupling for receiving a driving force from the image forming apparatus to drive the photosensitive drum to rotate; The developing unit further comprises a driving force receiving part for receiving a driving force from the image forming apparatus to drive the developing roller to rotate; The drum coupling and the driving force receiving part constitute the movable part; The force receiving part comprises a force receiving component and an axial extension structure; When the force receiving component receives a first force from the image forming apparatus, it rotates and drives the axial extension structure to move, and the movement of the axial extension structure drives the drum coupling and the driving force receiving part to extend axially, so as to receive the driving force from the image forming apparatus; When the force receiving component receives a second force from the image forming apparatus, it rotates and drives the axial extension structure to move, and the movement of the axial extension structure drives the drum coupling and the driving force receiving part to retract axially, so as to not receive the driving force from the image forming apparatus.

81. The process cartridge of claim 80 wherein, The force receiving component comprises a third action structure, and the axial extension structure comprises a fourth action structure; The force receiving component is arranged to be rotatable about its rotation axis, and the rotation axis of the force receiving component is parallel to and does not coincide with the rotation axis of the driving force receiving part; When the force receiving component rotates, the third action structure and the fourth action structure act to drive the axial extension structure to move axially.

82. The process cartridge of claim 80 wherein, The drum frame comprises a driving side end cover, the axial extension structure is arranged on the driving side end cover to be axially movable but not rotatable, and the force receiving component is arranged on the driving side end cover to be rotatable but not axially movable.

83. The process cartridge of claim 80 wherein, The drum unit further comprises a drum elastic member abutting against the drum coupling to drive the drum coupling to extend axially, and the developing unit further comprises a developing elastic member abutting against the driving force receiving part to drive the driving force receiving part to extend axially.

84. The process cartridge of claim 80 wherein, The processing cartridge further comprises a first elastic member for keeping the developing roller and the photosensitive drum in contact in any state.

85. A processing cartridge for being detachably installed in a main assembly of an image forming apparatus, the main assembly being provided with a separation control component, the processing cartridge comprising: a drum unit comprising a drum frame and a photosensitive drum rotatably arranged on the drum frame, an axis of the photosensitive drum extending in a first direction; A developing unit includes a developing frame and a developing roller rotatably provided on the developing frame, an axis of the developing roller extending in a first direction; the developing unit is oppositely arranged with the drum unit in a second direction and is movable relative to the drum unit between a developing position and a spaced position, in the developing position, the developing roller is in contact with the photosensitive drum, in the spaced position, the developing roller is at least partially spaced apart from the photosensitive drum; A developing coupling for receiving a rotational driving force and transmitting the rotational driving force to the developing roller; The developing frame is axially moved relative to the developing coupling in the first direction when the developing unit is moved between the developing position and the spaced position; The developing coupling is not moved relative to the drum frame when the developing unit is moved between the developing position and the spaced position.

86. The process cartridge of claim 85 wherein, Further comprising a force receiving member fixedly provided on the developing frame, the force receiving member including a first force receiving portion and a second force receiving portion; The developing frame is axially moved relative to the developing coupling in the first direction when the second force receiving portion receives a second acting force applied by the separation control member to move the developing unit from the developing position to the spaced position; The developing frame is axially moved relative to the developing coupling in the first direction when the first force receiving portion receives a first acting force applied by the separation control member to move the developing unit from the spaced position to the developing position.

87. The process cartridge of claim 86 wherein, Further comprising a first clamping portion provided on the drum frame and a second clamping portion provided on the developing frame; The first clamping portion includes a first acting portion, a third acting portion and a second acting portion sequentially arranged in the second direction, the first acting portion is closest to the axis of the photosensitive drum in the second direction; The second clamping portion can cooperate with the first acting portion to keep the developing unit in the developing position; The second clamping portion can cooperate with the second acting portion to keep the developing unit in the spaced position.

88. The process cartridge of claim 87, wherein, The first acting portion has a first inclined surface, the second acting portion has a second inclined surface, when the second clamping portion moves along the first inclined surface or the second inclined surface, the developing frame is axially moved relative to the developing coupling in the first direction.

89. The process cartridge of claim 85 wherein, Further comprising a force receiving member slidingly provided on the developing frame, the force receiving member including a first force receiving portion and a second force receiving portion; When the second force receiving portion receives a second acting force applied by the separation control member to be unlocked, the developing frame can be axially moved relative to the developing coupling in the first direction and the force receiving member can be moved relative to the developing frame in the second direction; When the first force receiving portion receives a first acting force applied by the separation control member to be locked, the developing frame can be axially moved relative to the developing coupling in the first direction and the force receiving member can be moved relative to the developing frame in the second direction.

90. The process cartridge of claim 89, wherein, Further comprising a first clamping portion provided on the drum frame and a second clamping portion provided on the force receiving member; The first clamping part comprises a second action part which is a surface inclined relative to the first direction, and when the first force receiving part receives the force of the separation control component and moves along the second action part, the developing frame is driven to move axially in the first direction.

91. The process cartridge of claim 90 wherein, The first clamping part comprises a first action part which is connected with the second action part and is closer to the axis of the photosensitive drum in the second direction than the second action part, and when the second clamping part abuts against the first action part, the developing frame is locked and cannot move axially in the first direction.

92. The process cartridge of claim 91, wherein, When the developing coupling drives the developing roller to rotate, the axial component force can drive the developing frame to move axially in the first direction.

93. The process cartridge of claim 89 wherein, The developing frame is provided with a second limiting part for limiting the movement of the force receiving member in the second direction.

94. The process cartridge of claim 89 wherein, The tenth elastic member is arranged between the developing coupling and the developing frame, and the tenth elastic member applies a force in the opposite direction to the axial direction to the developing coupling and the developing frame.

95. The process cartridge of claim 89 wherein, The first clamping part is arranged on the drum frame, and the second clamping part is arranged on the developing frame. The first clamping part comprises a second action part which is a surface inclined relative to the first direction, and when the second clamping part abuts against the second action part, the developing unit is kept in the spaced position.

96. The process cartridge of claim 95: The force receiving member is provided with a locking part, the first clamping part comprises a first action part which is connected with the second action part and is closer to the axis of the photosensitive drum in the second direction than the second action part, and when the locking part abuts against the first action part, the developing frame is locked and cannot move axially in the first direction.

97. The process cartridge of claim 89 wherein, The developing frame is provided with a bearing cover, and the developing coupling is arranged on the bearing cover and can move axially in the first direction relative to the bearing cover.

98. The process cartridge of claim 97, wherein, The force receiving member is slidingly arranged on the bearing cover.

99. The process cartridge of claim 98 wherein, The force receiving member is provided with a fourth sliding groove, the drum frame is provided with a separation guide part matched with the fourth sliding groove, and the separation guide part is provided with a separation guide inclined surface relative to the first direction and the second direction.

100. The process cartridge of claim 99, wherein, When the force receiving member receives the second action force of the separation control component and moves in the second direction, the end of the fourth sliding groove slides along the separation guide inclined surface, so that the force receiving member and the developing frame move axially in the first direction together.

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