Developing device

Abstract

The utility model discloses a developing device which is characterized in that a box body is provided with a first end and a second end in a first direction and is provided with a third end and a fourth end in a third direction, and a developing roller is positioned at the third end; the driving piece is arranged at the first end; the separation part is only arranged at the first end and is used for receiving separation force provided by the image forming device to drive the developing device to move from a contact position where the developing roller is in contact with the photosensitive drum to a separation position where the developing roller is separated from the photosensitive drum; the abutting part is arranged at the second end, and when the developing device moves towards the separation position, the abutting part abuts against the side wall of the drum assembly; the second end is also provided with a second forced pushing piece used for receiving the forced pushing force of the drum assembly, and the second forced pushing piece comprises a second forced pushing surface in contact with a second forced pushing piece on the drum assembly; in the third direction, the abutting portion is farther away from the third end than the second forced pushing face. The developing device disclosed by the utility model is simple in structure and simpler to assemble, the production cost can be reduced, and simplification and miniaturization of the developing device are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic imaging technical field, concretely relates to a developing device. BACKGROUND

[0002] The developing box (developing device) is a kind of detachable part widely applied in image forming device. Developer needs to be carried and transported to photosensitive drum by powder feeding roller and developing roller, in color printer, usually need to install the developing box with the developer of four different colors of cyan, magenta, yellow and black carried respectively, by the combination use of four colors of developer, it can present a variety of colors, but when certain color does not need to be printed on paper, corresponding developing box needs to be separated from photosensitive drum, avoids the developer carried by it to be transmitted to photosensitive drum, finally pollutes paper, in prior art, separation piece is usually arranged at both ends of developing box, and separation force applying piece is arranged on both side walls in image forming device, separation force applying piece exerts separation force on the separation piece of both ends of developing box, so that developing box moves relative to photosensitive drum, to make developing roller separate from photosensitive drum, which leads to the structure of image forming device and developing box is very complex, and cost increases. SUMMARY

[0003] The utility model solves technical problem for providing a kind of developing device only in one end of developing device receives separation force, to simplify developing device structure and image forming device structure.

[0004] The technical scheme of the utility model is:

[0005] A kind of developing device, it can be detachably combined with drum assembly with side wall and be installed to the image forming device capable of providing separation force together with drum assembly, the drum assembly includes photosensitive drum, and the developing device includes:

[0006] Box body, for storing developer, the box body has oppositely arranged first end and second end in first direction, and has oppositely arranged third end and fourth end in third direction, the first direction intersects with the third direction;

[0007] Developing roller, rotatably supported in the box body and located at the third end, the axis of the developing roller extends along the first direction;

[0008] Driving part, arranged at the first end, for receiving power output by image forming device;

[0009] Separation part, only arranged at the first end, the separation part is fixedly arranged on the box body, and the separation part is used to receive separation force provided by image forming device to drive the developing device to move from the contact position of the developing roller and the photosensitive drum to the separation position of the developing roller and the photosensitive drum.

[0010] an abutment portion disposed at the second end, the abutment portion abutting against a sidewall of the drum assembly when the developing device moves to the separation position;

[0011] the second end further comprises a second forced pushing member for receiving the forced pushing force from the drum assembly, the second forced pushing member comprising a second forced pushing surface for contacting a second forced pushing member on the drum assembly;

[0012] in the third direction, the abutment portion is further away from the third end than the second forced pushing surface.

[0013] In some embodiments, the abutment portion and the sidewall of the drum assembly form a second fulcrum when the developing device moves from the contact position to the separation position, the developing device moves around the second fulcrum.

[0014] In some embodiments, the contact point between the end of the developing roller away from the driving member and the photosensitive drum forms a first fulcrum when the developing device moves from the contact position to the separation position, the developing device moves around the first fulcrum before moving around the second fulcrum.

[0015] In some embodiments, in the first direction, the second fulcrum is further away from the driving member than the first fulcrum.

[0016] In some embodiments, when the developing device is in the separation position, the axis of the developing roller intersects the axis of the photosensitive drum.

[0017] In some embodiments, the first end further comprises a first forced pushing member for receiving the forced pushing force from the drum assembly, the first forced pushing member is offset from the separation portion in the first direction, the separation portion is disposed on an end surface of the first forced pushing member away from the first end.

[0018] In some embodiments, the abutment portion protrudes from the second end of the cartridge body in the first direction, in the first direction, the abutment portion is further away from the main body of the developing roller than the outer surface of the second end.

[0019] In some embodiments, in the third direction, the abutment portion is located between the driving member and the developing roller.

[0020] In some embodiments, further comprising an electrical contact surface, the electrical contact surface is disposed at the first end of the cartridge body, in the third direction, the abutment portion is located between the electrical contact surface and the developing roller.

[0021] In some embodiments, the abutment portion includes an abutment surface intersecting the third direction, in which a distance from at least one point on the abutment surface to the developing roller axis is 8-12mm.

[0022] The developing device of the utility model has the advantages of simple structure, simple assembly, reduced production cost, and facilitation of simplification and miniaturization of the developing device. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a perspective structural schematic view of the developing device in the embodiment of the utility model;

[0024] Figure 2 It is a perspective structural schematic view of the developing device in the embodiment of the utility model;

[0025] Figure 3 It is a perspective structural schematic view of the drum assembly in the embodiment of the utility model;

[0026] Figure 4 It is a perspective structural schematic view of the drum assembly in the embodiment of the utility model;

[0027] Figure 5 It is a perspective structural schematic view of the drum assembly in the embodiment of the utility model;

[0028] Figure 6 It is a perspective structural schematic view of the developing device and the drum assembly in the combined state in the embodiment of the utility model;

[0029] Figure 7 It is a perspective structural schematic view of the developing device and the drum assembly in the combined state in the embodiment of the utility model;

[0030] Figure 8 It is a structural schematic view of the developing device and the photosensitive drum when viewed from top to bottom in the embodiment of the utility model;

[0031] Figure 9 It is a perspective structural schematic view of the abutment piece in the embodiment of the utility model;

[0032] Figure 10 It is a structural schematic view of the developing device and the photosensitive drum, the first push piece and the separation lever when viewed from right to left in the embodiment of the utility model;

[0033] Figure 11 It is a structural schematic view of the developing device and the photosensitive drum, the second push piece when viewed from left to right in the embodiment of the utility model;

[0034] Figure 12The structural schematic view between the developing roller, the abutting portion, the drum assembly side wall and the photosensitive drum when the developing device is in the contact position when viewed from top to bottom in the embodiment of the present utility model;

[0035] Figure 13 The structural schematic view between the developing roller, the abutting portion, the drum assembly side wall and the photosensitive drum when the developing device is in the contact position when viewed from top to bottom in the embodiment of the present utility model;

[0036] Figure 14 The structural schematic view between the developing roller, the abutting portion, the drum assembly side wall and the photosensitive drum when the developing device is in the contact position when viewed from top to bottom in the embodiment of the present utility model. DETAILED DESCRIPTION

[0037] The utility model will be further explained in detail in connection with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0038] It needs to be explained that the terms "first", "second" and the like are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three and the like, unless otherwise specifically limited.

[0039] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected or integrated, can be mechanically connected, electrically connected or in communication with each other, can be directly connected or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0041] In the above description, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" 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 this 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 appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the specification without contradiction.

[0042] As shown in Figures 1 to 14 A developing device capable of being detachably combined with the drum assembly 9 and capable of being detachably installed together with the drum assembly 9 inside the image forming device.

[0043] As shown in Figures 3 to 5 The drum assembly 9 includes a first side plate 91, a second side plate 92, a third side plate 93, a photosensitive drum 94, a first push piece 911, a second push piece 921, a first electric transfer piece 96, and a separation lever 95.

[0044] As shown in Figure 4 The photosensitive drum 94 can rotate around an axis extending in the first direction, the right end and the left end of the photosensitive drum 94 are rotatably supported by the first side plate 91 and the second side plate 92 respectively, and the right end of the third side plate 93 is fixedly connected with the first side plate 91 (such as by integrally injection molding, etc.), and the left end of the third side plate 93 is fixedly connected with the second side plate 92.

[0045] As shown in Figure 5As shown, the first pushing piece 911 is located at the left end surface of the first side plate 91, the second pushing piece 921 is located at the right end surface of the second side plate 92, the first elastic piece 912 is arranged between the first pushing piece 911 and the first side plate 91, the second elastic piece 922 is arranged between the second pushing piece 921 and the second side plate 92, the first elastic piece 912 and the second elastic piece 922 are respectively used for applying a pushing force along the fourth direction to the first pushing piece 911 and the second pushing piece 921, the fourth direction intersects with the second direction and the third direction and is orthogonal to the first direction, specifically, in the embodiment, the fourth direction includes the front lower direction and the rear upper direction when viewed from right to left. The first pushing piece 911 and the second pushing piece 921 can move relative to the first side plate 91 and the second side plate 92 along the fourth direction.

[0046] As shown in Figure 7 , the first electric transfer piece 96 is fixed on the second side plate 92, the first electric transfer piece 96 includes a first electric receiving surface and a first electric applying surface, the first electric transfer piece 96 is a steel sheet (in other embodiments, it can also be made of conductive resin and the like), the first electric receiving surface faces left and is located at the left surface of the second side plate 92, the first electric receiving surface is used for contacting the power supply terminal in the image forming device and receiving the potential provided by the power supply terminal, and the first electric applying surface faces right.

[0047] The second pushing piece 921 is in contact with and electrically connected to the first electric applying surface of the first electric transfer piece 96, the second pushing piece 921 is made of conductive resin, in other embodiments, the second pushing piece 921 can also be made of conductive metal and the like, in addition, only part of the second pushing piece 921 can be made of conductive material to save cost.

[0048] As shown in Figure 3 , Figure 6 and Figure 10 , the separation lever 95 can rotate about the rotation axis extending along the first direction, the separation lever 95 is rotationally connected to the left end surface of the first side plate 91, specifically, the separation lever 95 includes a force receiving end 953, a pivot hole 952 and a force applying end 951, the pivot hole 952 is located between the force receiving end 953 and the force applying end 951, and the pivot hole 952 is inserted by the pivot shaft on the first side plate 91, so that the separation lever 95 can rotate about the pivot shaft.

[0049] As shown in Figure 1 and Figure 2 , the developing device includes a box body 1, a developing roller 131, a powder feeding roller, a driving piece 21, a stirring piece, a transmission assembly, a first protective cover 111, an identification assembly, a forced pushing assembly and a separation assembly.

[0050] As shown in Figure 1 and Figure 2As shown, the box body 1 has a first end 11 and a second end 12 oppositely arranged in a first direction, the box body 1 has a third end 13 and a fourth end 14 oppositely arranged in a third direction, the box body 1 has a fifth end 15 and a sixth end 16 oppositely arranged in a second direction, the first direction, the second direction and the third direction intersect with each other, specifically, the first direction, the second direction and the third direction are orthogonal to each other, in this embodiment, for the convenience of description, the first direction is defined as the left-right direction, the second direction is defined as the front-rear direction, and the third direction is defined as the up-down direction, the first end 11 is the right end of the box body 1, the second end 12 is the left end of the box body 1, the third end 13 is the lower end of the box body 1, the fourth end 14 is the upper end of the box body 1, the fifth end 15 is the front end of the box body 1, and the sixth end 16 is the rear end of the box body 1, the box body 1 further includes an upper wall of the box body 1, a lower wall of the box body 1, a left wall of the box body 1, a right wall of the box body 1, and a rear wall of the box body 1, the accommodating cavity and the powder outlet are formed by the combination of the upper wall of the box body 1, the left wall of the box body 1, the right wall of the box body 1, the front wall of the box body 1, and the rear wall of the box body 1, the first end 11 is located on the right wall of the box body 1, the second end 12 is located on the left wall of the box body 1, the fourth end 14 is located on the upper wall of the box body 1, the fifth end 15 is located on the front wall of the box body 1, and the sixth end 16 is located on the rear wall of the box body 1, the box body 1 is internally provided with an accommodating cavity for accommodating the developer, the third end 13 of the box body 1 is provided with a powder outlet, the powder outlet is used to communicate the accommodating cavity with the outside, so that the developer in the accommodating cavity can move to the outside of the box body 1 through the powder outlet, and the fourth end 14 of the box body 1 can be provided with a handle for easy taking.

[0051] As shown in Figure 1 , Figure 2 , Figures 12 to 14 The developing roller 131 is rotatably installed in the box body 1, the developing roller 131 includes a developing roller body 1311 extending along the first direction and a developing roller shaft 1312, the developing roller body 1311 is in a cylindrical shape, the developing roller shaft 1312 is coaxial with the developing roller body 1311 and penetrates the developing roller body 1311 along the axial direction of the developing roller body 1311, so that the developing roller body 1311 rotates together with the developing roller shaft 1312, the developing roller body 1311 is used to carry and convey the developer to the surface of the photosensitive drum 94, the developing roller shaft 1312 is used to receive power to drive the developing roller body 1311 to rotate together, the rotation axis of the developing roller 131 extends along the first direction, the developing roller 131 is located at the powder outlet of the third end 13 of the box body 1, and in the second direction, a part of the circumferential surface of the developing roller body 1311 is covered by the box body 1 and is in the accommodating cavity, and the other part is exposed to the outside of the box body 1 through the powder outlet.

[0052] The powder feeding roller is rotatably installed in the cartridge body 1, and includes a powder feeding roller body extending along the first direction and a powder feeding roller shaft axially penetrating the powder feeding roller body and used to receive power to rotate the powder feeding roller body together. A circumferential surface of the powder feeding roller body is in contact with a circumferential surface of the developing roller body 1311, so as to uniformly deliver the developer in the accommodating cavity to the developing roller body 1311. Two ends of the powder feeding roller shaft are rotatably supported by the first end 11 and the second end 12 of the cartridge body 1 respectively, and a rotation axis of the powder feeding roller is parallel to the first direction.

[0053] As shown in Figure 1 , the driving member 21 is located at the first end 11 of the cartridge body 1, and is rotatably installed at the first end 11 of the cartridge body 1. A rotation axis of the driving member 21 extends along the first direction, and the driving member 21 is used to receive power provided by the image forming device to rotate.

[0054] The stirring member is rotatably installed in the developer accommodating cavity, and includes a stirring shaft and stirring blades fixedly installed on the stirring shaft and rotatable together with the stirring shaft. The stirring blades are used to stir the developer in the developer accommodating cavity. Left and right ends of the stirring member are rotatably supported by the first end 11 and the second end 12 of the cartridge body 1 respectively, and a rotation axis of the stirring member is parallel to the first direction.

[0055] The transmission assembly is used to transmit power of the driving member 21 to the developing roller 131, the powder feeding roller and the stirring member. Specifically, the transmission assembly includes a developing roller gear, a powder feeding roller gear and a stirring gear. The developing roller gear is fixedly installed at a right end of the developing roller shaft 1312 and located at a right side of the first end 11 of the cartridge body 1. The developing roller gear is supported by the developing roller shaft 1312 and engaged with the driving member 21. The powder feeding roller gear is fixedly installed at a right end of the powder feeding roller shaft and located at a right side of the first end 11 of the cartridge body 1. The powder feeding roller gear is supported by the powder feeding roller shaft and engaged with the driving member 21. The stirring gear is fixedly installed at a right end of the stirring member and located at a right side of the first end 11 of the cartridge body 1. The stirring gear is engaged with the driving member 21. In addition, in other embodiments, the transmission assembly can further include any number of idlers, such as an idler arranged between the developing roller gear and the driving member 21, an idler arranged between the powder feeding roller and the driving member 21 and / or an idler arranged between the stirring gear and the driving member 21, so as to be able to change the transmission ratio, the rotation direction and the like.

[0056] As shown in Figure 1 , the first cover 111 is detachably fixedly arranged at the first end 11 of the cartridge body 1, and is used to cover the transmission assembly and the driving member 21 to protect the transmission assembly and the driving member 21.

[0057] As shown in Figure 1 and Figure 2As shown, the identification assembly comprises a storage medium 3 and an electrical contact surface 31, the storage medium 3 is electrically connected with the electrical contact surface 31, the electrical contact surface 31 is used to contact and electrically connect with an electrical contact terminal in the image forming device, so that the image forming device can read the information (such as the model, life, capacity, etc. of the developing device) stored in the storage medium 3 through the electrical contact surface 31, wherein the electrical contact surface 31 is fixedly arranged at the first end 11 of the box body 1 and faces forward, that is, the second direction is the normal direction of the electrical contact surface 31, and the electrical contact surface 31 is closer to the fourth end 14 than the third end 13. In this embodiment, the storage medium 3 and the electrical contact surface 31 are arranged on the same substrate, and the substrate is supported and fixed on the support, and the support is fixedly arranged at the first end 11 of the box body 1. Specifically, the support is integrally formed with the first cover 111. The electrical contact surface 31 is the front face of the copper sheet or conductive metal sheet fixedly arranged on the substrate. In other embodiments, the storage medium 3 and the substrate can be arranged separately from the electrical contact surface 31, such as arranging the storage medium 3 at the second end 12 of the box body 1, and electrically connecting the storage medium 3 and the electrical contact surface 31 through a conductive element such as a wire.

[0058] As shown in Figure 1 and Figure 2 , the forced pushing assembly comprises a first forced pushing piece 4 and a second forced pushing piece 5, the first forced pushing piece 4 is located at the first end 11 of the box body 1 and can move with the box body 1, and the second forced pushing piece 5 is located at the second end 12 of the box body 1 and can move with the box body 1.

[0059] As shown in Figure 1 and Figure 10 , the first forced pushing piece 4 is fixedly arranged (such as pasted, clamped, integrally formed, fixed by screws and the like) on the right end face of the first cover, and the first forced pushing piece 4 extends to the right to protrude from the right end face of the first cover. The rear end of the first forced pushing piece 4 is a first forced pushing surface 41, and the first forced pushing surface 41 is used to contact the first forced pushing piece 911 to receive the forced pushing force applied by the first forced pushing piece 911.

[0060] As shown in Figure 2 and Figure 11As shown, the second forced pushing piece 5 is fixedly arranged at the second end 12 of the box body 1, and the second forced pushing piece 5 comprises a plate-shaped portion 52 and a forced pushing portion 51. The plate-shaped portion 52 is fixedly connected (such as pasted, clamped, integrally formed, fixed by screws or the like fasteners, etc.) at the second end 12 of the box body 1, and the plate-shaped portion 52 is provided with a first support hole and a second support hole. The developing roller shaft 1312 of the developing roller 131 and the left end of the powder feeding roller shaft of the powder feeding roller are respectively inserted into the first support hole and the second support hole. The forced pushing portion 51 is fixedly connected with the plate-shaped portion 52 and protrudes from the left end of the plate-shaped portion 52 to the left. The second forced pushing piece 5 also serves as a conductive piece to apply voltage to the developing roller 131 and the powder feeding roller. Specifically, the forced pushing portion 51 and the plate-shaped portion 52 are made of conductive material (such as conductive metal, conductive resin, etc.), so that the forced pushing portion 51 and the plate-shaped portion 52 are electrically connected, and at the same time, the plate-shaped portion 52 is electrically connected with the developing roller 131 and the powder feeding roller. The rear end of the forced pushing portion 51 is a second forced pushing surface 511, which is used to contact the second forced pushing piece 921 to receive the pushing force applied by the second forced pushing piece 921. At the same time, the second forced pushing surface 511 contacts the second forced pushing piece 921 to receive voltage from the second forced pushing piece 921, and then transmits the voltage to the developing roller 131 and the powder feeding roller through the forced pushing portion 51 and the plate-shaped portion 52.

[0061] Under the action of the pushing forces applied by the first forced pushing piece 911 and the second forced pushing piece 921, the first forced pushing piece 4 and the second forced pushing piece 5 drive the entire developing device to move along the fourth direction towards the direction close to the photosensitive drum 94, so that the developing roller 131 is in close contact with the photosensitive drum 94.

[0062] As shown in Figure 1 , Figure 2 , Figures 9 to 11 The separation assembly comprises a separation portion 6 and an abutting piece 7. The separation portion 6 is fixedly arranged at the first end 11 of the box body 1, specifically, the separation portion 6 is fixedly arranged (such as pasted, clamped, integrally formed, fixed by screws or the like fasteners, etc.) on the first forced pushing piece 4. The separation portion 6 is in a protruding structure, and extends to the right to protrude from the right end surface of the first forced pushing piece 4 (i.e. arranged away from the first end 11), so that when viewed in the front-rear direction, the first forced pushing piece 4 is located in the middle of the first protective cover 111 and the separation portion 6 in the first direction. This makes the first forced pushing piece 4 and the separation portion 6 staggered in the first direction, so that the first forced pushing piece 4 and the separation portion 6 can respectively contact the first forced pushing piece 911 and the separation lever 95, and the positions of the first forced pushing piece 911 and the separation lever 95 can be arranged to be mutually non-interfering positions. In the third direction (up-down direction), the separation portion 6 is closer to the third end 13 than the first forced pushing surface 41.

[0063] As shown in Figure 2 , Figure 7 ,Figure 9 , Figure 11 As shown, the abutment 7 is fixedly disposed (e.g., by adhesive, snap-fit, integral molding, or fasteners such as screws) at the second end 12 of the housing 1. The abutment 7 has an abutment portion 71 for contacting and abutting against the edge of the second side plate 92. The abutment portion 71 has an abutment surface for abutting against the edge of the second side plate 92, intersecting the vertical direction. The abutment portion 71 extends to the left along the first direction and protrudes from the second end 12 of the housing 1. In the vertical direction, the abutment portion 71 is located between the developing roller 131 and the stirring element. In the vertical direction, the abutment portion 71 is further away from the third end 13 than the second forced pushing surface 511. In the vertical direction, at least one point on the abutment surface is 8-12 mm away from the axis of the developing roller. In the vertical direction, the abutment portion 71 is located between the electrical contact surface 31 and the developing roller 131. In the horizontal direction, the abutment portion 71 is further away from the developing roller body 1311 than the outer surface of the second end 12. In the vertical direction, the abutment portion 71 is located between the drive member 21 and the developing roller 131.

[0064] like Figures 12 to 14 As shown, the developing device can move relative to the drum assembly 9 between the contact position where the developing roller 131 contacts the photosensitive drum 94 and the separation position where the developing roller 131 and the photosensitive drum 94 are no longer in contact. This allows the developing device to move from the contact position to the separation position when the current printing task of the image forming apparatus does not require a certain color developer stored in the developing device. This prevents the unwanted color developer from being transferred to the photosensitive drum 94 and then to the transfer belt, which would ultimately cause the paper to be contaminated with unwanted color and affect the print quality.

[0065] When in the contact position, the circumferential surface of the developing roller body 1311 is in contact with the circumferential surface of the photosensitive drum 94, and the axis of the developing roller 131 is parallel to the axis of the photosensitive drum 94. When in the separation position, the circumferential surface of the developing roller body 1311 is no longer in contact with the circumferential surface of the photosensitive drum 94, and the axis of the developing roller 131 intersects the axis of the photosensitive drum 94, that is, the axis of the developing roller 131 is inclined relative to the first direction.

[0066] Specifically, when the developing device moves from the contact position to the separation position, the image forming device applies a separation force to the force-receiving end 953 of the separation lever 95, causing the force-receiving end 953 to swing towards the photosensitive drum 94, and consequently causing the force-applying end 951 to swing away from the photosensitive drum 94. The separation part 6 receives the separation force applied by the force-applying end 951 and moves the cartridge 1 together towards the direction away from the photosensitive drum 94. At the same time, the first forced pusher 4 overcomes the pushing force of the first forced pusher 911 and moves along the fourth direction towards the direction away from the photosensitive drum 94, causing the right end of the developing device to move along the fourth direction towards the direction away from the photosensitive drum 94. The developing roller 131 moves with the developing device. Since only the right end of the developing device's separation part 6 receives the separation force, and the left end does not receive the separation force, the developing device will swing around the contact point between the left end of the developing roller body 1311 and the photosensitive drum 94, thereby causing the developing roller 131 to move with the developing device until the axis of the developing roller 131 intersects with the axis of the photosensitive drum 94.

[0067] like Figure 13 As shown, when viewed from above, the developing device uses the contact point between the left end of the developing roller body 1311 and the photosensitive drum 94 as the first fulcrum A1 and swings counterclockwise around the first fulcrum A1 at a certain angle. That is, the right end of the developing device moves upward and backward, while the left end moves downward and forward, causing the contact part 71 to contact the second side plate 92 of the photosensitive drum 94, thus forming the second fulcrum A2. Figure 14 As shown, as the separation section 6 continuously receives the separation force, the developing device continues to swing counterclockwise around the second fulcrum A2 by a certain angle, thereby causing the circumferential surface of the developing roller body 1311 at the first fulcrum A1 to disengage from the circumferential surface of the photosensitive drum 94, thus completing the process of moving from the contact position to the separation position and realizing the disengagement of the developing roller 131 from the photosensitive drum 94. In other words, the separation force provided by the image forming apparatus is transmitted to the separation section 6 of the developing device via the separation lever 95 on the drum assembly 9, causing the developing roller 131 to separate from the photosensitive drum 94. This avoids unwanted developer being incorrectly delivered to the photosensitive drum 94, resulting in reduced print quality. Furthermore, using the separation method in this embodiment, the separation section 6 only needs to be set at one end of the developing device, meaning that only one end of the developing device needs to receive the separation force. This allows the image forming apparatus to provide only one separation force, which, compared to providing separation force at both ends of the developing device, simplifies the structure of the image forming apparatus. Furthermore, in this embodiment, both the separating part 6 and the abutting part 71 are fixed on the housing 1, and can be manufactured together with other parts by integral injection molding, which reduces costs, simplifies assembly, and the simple structure is conducive to the miniaturization of the developing device.

[0068] In some embodiments, the abutting portion can also be configured to abut against the second side plate 92 when the developing device is mounted to the drum assembly 9 and the developing roller 131 is in contact with the photosensitive drum 94, so that when the separating portion 6 receives the separating force, the developing device can directly move about the second pivot point without first moving about the first pivot point.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for part or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A developing apparatus capable of being detachably combined with and mounted together with a drum assembly having sidewalls into an image forming apparatus capable of providing separation force, the drum assembly comprising a photosensitive drum, characterized in that, The developing apparatus includes: A housing for storing developer, the housing having a first end and a second end disposed opposite to each other in a first direction, and a third end and a fourth end disposed opposite to each other in a third direction, the first direction intersecting the third direction; A developing roller is rotatably supported on the housing and located at the third end, the axis of the developing roller extending along a first direction; A driving element, disposed at the first end, is used to receive power output from the image forming apparatus; A separation section is provided only at the first end. The separation section is fixedly disposed on the housing. The separation section is used to receive the separation force provided by the image forming apparatus to drive the developing apparatus to move from the contact position where the developing roller contacts the photosensitive drum to the separation position where the developing roller separates from the photosensitive drum. An abutment portion is disposed at the second end, and when the developing device moves to the separation position, the abutment portion abuts against the side wall of the drum assembly; The second end is further provided with a second forced pusher for receiving the forced push force of the drum assembly. The second forced pusher includes a second forced pusher surface that contacts the second forced pusher on the drum assembly. In the third direction, the abutting portion is further away from the third end than the second forced pushing surface.

2. The developing apparatus according to claim 1, characterized in that, When the developing device moves from the contact position to the separation position, a second fulcrum is formed between the abutting part and the side wall of the drum assembly, and the developing device moves around the second fulcrum.

3. A developing apparatus according to claim 2, characterized in that, When the developing device moves from the contact position to the separation position, the end of the developing roller away from the driving member forms a first fulcrum with the contact point of the photosensitive drum. The developing device moves around the first fulcrum, and then moves around the second fulcrum.

4. A developing apparatus according to claim 3, characterized in that, In the first direction, the second fulcrum is farther away from the drive member than the first fulcrum.

5. A developing apparatus according to claim 2, characterized in that, When the developing device is in the separated position, the axis of the developing roller intersects with the axis of the photosensitive drum.

6. A developing apparatus according to any one of claims 1-5, characterized in that, The first end is further provided with a first forced pusher for receiving the forced push force of the drum assembly. The first forced pusher is offset from the separation part in a first direction, and the separation part is disposed on the end face of the first forced pusher away from the first end.

7. A developing apparatus according to any one of claims 1-5, characterized in that, The abutting portion protrudes from the second end of the housing along a first direction. In the first direction, the abutting portion is further away from the developing roller body than the outer surface of the second end.

8. A developing apparatus according to claim 7, characterized in that, In the third direction, the abutment portion is located between the drive member and the developing roller.

9. A developing apparatus according to claim 7, characterized in that, It also includes an electrical contact surface, which is disposed at the first end of the housing, and in the third direction, the abutment portion is located between the electrical contact surface and the developing roller.

10. A developing apparatus according to claim 7, characterized in that, The contact portion includes a contact surface that intersects with the third direction. In the third direction, at least one point on the contact surface is 8-12 mm away from the axis of the developing roller.

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