Processing box

Abstract

The utility model discloses a processing box, which is detachably arranged on an image forming device and comprises a drum unit, a driving unit and a driving unit, a developing unit rotatably mounted on the drum unit, the developing unit rotatably provided with a developing roller; one end of the first elastic piece is connected with the drum unit, and the other end of the first elastic piece is connected with the developing unit; the developing coupler is arranged on the developing unit and can drive the developing roller to rotate; in the first state, the image forming device drives the developing coupler to move, the developing coupler drives the developing unit to rotate in the forward direction, the first elastic piece is stressed to deform, and the developing roller makes contact with the photosensitive drum and keeps the contact state. In the second state, the image forming device stops driving the developing coupler, the first elastic piece recovers deformation and drives the developing unit to rotate reversely, and the developing roller and the photosensitive drum are separated and kept in a separated state. A contact force receiving part and / or a separating force receiving part do not need to be additionally arranged, and miniaturization of the processing box is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of image forming devices, in particular to a processing box. Background Art

[0002] The process cartridge is an important component in the development process of the image forming device, and the process cartridge is detachably installed in a mounting chamber of the image forming device.

[0003] When the processing box is involved in the development task, the photosensitive drum and the developing roller are in contact and friction for a long time, which will accelerate the deterioration of the developing roller and / or carbon powder. In order to solve the above technical problems, a corresponding structure needs to be set to realize the switching between the contact and separation states of the developing roller and the photosensitive drum. In the prior art, the developing roller and the photosensitive drum of the processing box need to perform drum roller contact and / or drum roller separation operations according to the instructions of the image forming device. For example, a contact force receiving part and / or a separation force receiving part are set on the processing box. The contact force receiving part and / or the separation force receiving part can move between two positions, and the developing roller and the photosensitive drum are contacted and / or separated by receiving the contact force and / or separation force from the image forming device. However, the above structure is relatively complex, and in order to meet the image forming device's requirements for the high accuracy of the time and stability of the separation and contact between the developing roller and the photosensitive drum, the accuracy, material strength and matching tolerance of each part are required to be high, otherwise it will affect the development quality of the processing box. Utility Model Content

[0004] The processing box of the utility model can effectively solve the above problems.

[0005] According to one aspect of the utility model, there is provided a process cartridge which is detachably mounted on an image forming device, comprising:

[0006] a drum unit rotatably provided with a photosensitive drum;

[0007] A developing unit rotatably mounted on the drum unit, wherein the developing unit is rotatably provided with a developing roller;

[0008] a first elastic member, one end of which is connected to the drum unit, and the other end of which is connected to the developing unit;

[0009] A developing coupling, disposed on the developing unit, capable of driving the developing roller to rotate;

[0010] In the first state, the image forming device drives the developing coupling to move, the developing coupling drives the developing unit to rotate in the positive direction, the first elastic member is deformed by force, and the developing roller contacts and maintains the contact state with the photosensitive drum;

[0011] In the second state, the image forming device stops driving the developing coupling, the first elastic member recovers its deformation and drives the developing unit to rotate in the opposite direction, and the developing roller is separated from the photosensitive drum and remains in a separated state.

[0012] In some embodiments, a second elastic member is further included, and the second elastic member is clamped in the developing coupling, so that the developing coupling rotates after buffering, and the developing coupling rotates to drive the developing unit to rotate in the forward direction.

[0013] In some embodiments, the development coupling comprises:

[0014] A driving gear, used for transmitting driving force to drive the developing roller to rotate;

[0015] a driving head, one end of which is mounted in the driving gear and the other end of which is driven by the image forming device;

[0016] One end of the second elastic member is clamped with the driving gear, and the other end of the second elastic member is clamped with the driving head.

[0017] In some embodiments, a first slot is provided in the driving gear, a second slot is provided in the driving head, one end of the second elastic member is engaged with the first slot, and the other end of the second elastic member is engaged with the second slot.

[0018] In some embodiments, the driving head is provided with a force-applying portion, and the driving gear is provided with a force-receiving portion. In a first state, the driving head is driven by the image forming device, and the force-applying portion abuts against the force-receiving portion, driving the driving gear to rotate.

[0019] In some embodiments, the first slot is disposed on the force-bearing portion.

[0020] In some embodiments, in a first state, the second elastic member is deformed by force, and the force-applying portion abuts against the force-receiving portion; in a second state, the second elastic member is restored to shape, so that a gap exists between the force-applying portion and the force-receiving portion.

[0021] In some embodiments, the drum unit includes a photosensitive frame, which is provided with a first rotating hole; the developing unit includes a developing cover, one end of which is installed in the first rotating hole, and the developing unit can rotate around the first rotating hole; the first elastic member is arranged on both sides or between the two sides of the first rotating hole in the height direction.

[0022] In some embodiments, the first elastic member is disposed below the first rotating hole, one end of the first elastic member abuts against the photosensitive frame, and the other end of the first elastic member abuts against the developing cover.

[0023] In some embodiments, the first elastic member is disposed above the first rotating hole, one end of the first elastic member is connected to the photosensitive frame, and the other end of the first elastic member is connected to the developing cover.

[0024] In some embodiments, the first elastic member is arranged between two sides of the first rotating hole in the height direction, the photosensitive frame is provided with a positioning column, the first elastic member is installed on the positioning column, one end of the first elastic member abuts against the photosensitive frame, and the other end of the first elastic member abuts against the developing cover.

[0025] In some embodiments, a retaining component is further included on the developing unit, for maintaining the developing roller and the photosensitive drum in a separated state in the second state.

[0026] In some embodiments, the drum unit includes a photosensitive frame, and the photosensitive frame is provided with a contact portion;

[0027] The holding member is provided with a separation holding portion, and in the second state, the separation holding portion abuts against the contact portion to hold the developing unit at a position where the developing roller is separated from the photosensitive drum.

[0028] In some embodiments, the holding member is rotatably disposed on the developing unit;

[0029] The developing unit includes a developing gear meshed with a developing coupling. In a first state, the developing gear is driven to rotate by the developing coupling. When the developing gear rotates, it drives the retaining component to rotate so that the separation retaining portion is misaligned with the contact portion.

[0030] In some embodiments, the developing gear is provided with a developing gear protrusion, and the retaining component is provided with a contact triggering portion. When the developing gear is driven to rotate, the developing gear protrusion triggers the contact triggering portion to rotate the retaining component.

[0031] In some embodiments, a reset member is further included, one end of which is connected to the retaining component, and the other end is connected to the developing unit. When the retaining component is triggered to rotate by the developing gear protrusion, the reset member is deformed; the deformation recovery of the reset member can cause the retaining component to rotate in the opposite direction and reset.

[0032] The beneficial effects of the utility model are as follows: the present application has a first elastic member and a developing coupling. When a developing task needs to be completed, the developing coupling can drive the developing unit to rotate forward, so that the developing roller contacts and maintains a contact state with the photosensitive drum. When there is no developing task, the first elastic member can cause the developing unit to rotate reversely, so that the developing roller is separated from the photosensitive drum and maintains a separated state. The present application does not require additional contact force receiving parts and / or separation force receiving parts, has a simple structure and is conducive to the miniaturization of the processing box. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a three-dimensional diagram of a processing box according to the first embodiment of the utility model;

[0034] Figure 2 This is a structural exploded view of the processing box of the first embodiment of the utility model;

[0035] Figure 3 This is a schematic diagram of the structure of the developing protective cover in the first embodiment of the utility model;

[0036] Figure 4 It is a left side view of the processing box of the first embodiment of the utility model;

[0037] Figure 5 This is a structural disassembly diagram of the developing coupling in the first embodiment of the utility model;

[0038] Figure 6 This is a schematic diagram of the structure of the drive head in the first embodiment of the utility model;

[0039] Figure 7 It is a three-dimensional diagram of a processing box according to the second embodiment of the utility model;

[0040] Figure 8 It is a left side view of the processing box of the second embodiment of the utility model;

[0041] Fig. 9 This is a structural disassembly diagram of the developing coupling in the second embodiment of the utility model;

[0042] Fig.10 This is a schematic diagram of the structure of the drive head in the second embodiment of the present utility model;

[0043] Fig.11 It is a three-dimensional diagram of a processing box according to the third embodiment of the present utility model;

[0044] Fig.12 It is a three-dimensional diagram of the first elastic member in the third embodiment of the present utility model;

[0045] Fig.13 It is a left side view of the processing box of the third embodiment of the utility model;

[0046] Fig.14It is a three-dimensional diagram of the developing protective cover in the third embodiment of the present utility model;

[0047] Fig.15 This is a schematic diagram of the overall structure of a processing box according to a fourth embodiment of the present utility model;

[0048] Fig.16 This is a schematic diagram of the disassembled structure of the driving end of the processing cartridge of the fourth embodiment of the utility model;

[0049] Fig.17 It is a structural schematic diagram of a developing gear of a processing cartridge according to a fourth embodiment of the utility model;

[0050] Fig.18 It is a structural schematic diagram of a retaining component of a processing box according to a fourth embodiment of the utility model;

[0051] Fig.19 It is a structural schematic diagram of a developing protective cover of a processing cartridge according to a fourth embodiment of the utility model;

[0052] Fig. 20 It is a structural schematic diagram of a drive side end cover of a processing box according to a fourth embodiment of the utility model;

[0053] Fig.21 It is a schematic diagram of the partial structure of the driving side of the process cartridge in the second state of the fourth embodiment of the utility model;

[0054] Fig. 22 It is a driving side sectional view of the process cartridge of the fourth embodiment of the utility model in the second state;

[0055] Fig.23 It is a structural diagram of the driving side of the process cartridge of the fourth embodiment of the utility model in the second state (with the driving end cover and part of the drum unit components removed);

[0056] Fig.24 It is a schematic diagram of the partial structure of the driving side of the process cartridge in the first state of the fourth embodiment of the utility model;

[0057] Fig.25 It is a structural position diagram of the driving side of the process box in the first state of the fourth embodiment of the utility model;

[0058] Fig.26 It is a cross-sectional view of the driving side (with the driving end cover and part of the drum unit components removed) of the processing box of the fourth embodiment of the utility model in the first state. DETAILED DESCRIPTION

[0059] The utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0060] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0064] The utility model relates to a processing box, the processing box comprises a developing unit and a drum unit, the developing unit can be installed on the drum unit, an image forming device has an installation bin, the processing box is detachably installed in the installation bin, and the image forming device uses, for example, electronic photographic imaging processing to form an image on a recording material. The image forming device includes, for example, an electronic photographic copier, an electronic photographic printer (LED printer, laser printer, etc.), an electronic photographic printer type fax machine, etc.

[0065] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0066] Embodiment 1

[0067] Figure 1 The structure of a processing box according to the utility model is schematically shown. For the convenience of description, the length direction of the processing box is the X-axis direction, the end pointing to the +X-axis direction is the right side, and the end pointing to the -X-axis direction is the left side. The width direction of the processing box is the Y-axis direction, the end pointing to the +Y-axis direction is the front side, and the end pointing to the -Y-axis direction is the back side. The height direction of the processing box is the Z-axis direction, the end pointing to the +Z-axis direction is the upper side, and the end pointing to the -Z-axis direction is the lower side. The X-axis, Y-axis and Z-axis are perpendicular to each other, forming a three-axis coordinate system, as shown in FIG. Figure 1 As shown, the process cartridge includes a drum unit 1, a developing unit 2, a first elastic member 3 and a developing coupling 4.

[0068] like Figure 2 As shown, the drum unit 1 includes a photosensitive drum 11, a charging roller, a photosensitive coupling 15 and a photosensitive frame 12. The two sides of the photosensitive frame 12 in the X-axis direction include a driving side end cover 13 and a conductive side end cover 14. The photosensitive frame 12 is a frame structure. The conductive side end cover 14 is arranged on the +X-axis side (right side) of the photosensitive frame 12, and the driving side end cover 13 is arranged on the -X-axis side (left side) of the photosensitive frame 12. The two ends of the photosensitive drum 11 in the length (X-axis) direction are rotatably mounted on the driving side. On the end cover 13 and the conductive side end cover 14, the photosensitive drum 11 is arranged on the -Z axis side (lower end) in the Z axis direction of the photosensitive frame 12; both ends of the charging roller in the length (X axis) direction are installed on the photosensitive frame 12, and the charging roller is used to charge the surface of the photosensitive drum 11 with a uniform charge so that the photosensitive drum 11 can absorb toner; the photosensitive coupling 15 is connected to the -X axis side of the photosensitive drum 11 and is rotatably installed on the driving side end cover 13 to receive the driving force from the image forming device.

[0069] The driving side end cover 13 is provided with a first rotary hole 131 and a second rotary hole 132, both of which are through-hole structures on the driving side end cover 13, and the rotation axis of the first rotary hole 131 is in the X-axis direction. In the Z-axis (height) direction, the first rotary hole 131 is closer to the upper side of the photosensitive frame 12 than the photosensitive drum 11. In addition, the developing unit 2 can be rotatably mounted on the photosensitive frame 12, specifically, both ends of the developing unit 2 in the length (X-axis) direction can be rotatably mounted on the driving side end cover 13 and the conductive side end cover 14, and the developing unit 2 rotates around the rotation axis of the first rotary hole 131. The second rotary hole 132 is closer to the lower end of the driving side end cover 13, and the photosensitive coupling 15 is installed in the second rotary hole 132 to drive the photosensitive drum 11. The end of the photosensitive coupling 15 exposed in the second rotary hole 132 can receive the driving force of the image forming device.

[0070] like Figure 2 As shown, the developing unit 2 includes a box body 21, a driving side bearing 22, a conductive side bearing (not shown), a developing roller 23, a powder feeding roller, and a developing cover 25. The interior of the box body 21 is a hollow structure for storing toner. The driving side bearing 22 and the conductive side bearing are respectively installed at both ends of the length (X axis) direction of the box body 21. The powder feeding roller and the developing roller 23 are rotatably supported on the driving side bearing 22 and the conductive side bearing at both ends of the length direction of the box body 21. The driving side bearing 22 is installed on the -X axis side of the box body 21, and the conductive side bearing is installed on the +X axis side of the box body 21; the developing roller 23 is located on the -Z axis side of the box body 21, and the developing roller 23 is located on the -Z axis side of the box body 21. A developing gear 231 is installed on the -X axis side of the box body 23, and the developing gear 231 is sleeved on one end of the developing roller extending from the driving side bearing 22. The powder feeding roller is located on the -Z axis side of the box body 21. A powder feeding gear 241 is installed on the -X axis side of the powder feeding roller. The powder feeding gear 241 is sleeved on one end of the shaft of the powder feeding roller extending from the driving side bearing 22. The powder feeding roller can transfer the toner of the box body 21 to the developing roller 23. The toner adsorbed by the developing roller 23 transfers the toner to the photosensitive drum 11 through the potential difference between the developing roller and the photosensitive drum 11. The toner on the photosensitive drum 11 is then transferred through the transfer belt of the image forming device to form an image on the recording material (such as paper).

[0071] The developing cover 25 is a cover structure, which is installed on the -X axis side of the driving side bearing 22 and can be detachably installed on the driving side bearing 22. A cylindrical portion 252 and a sleeve portion 253 are provided on the -X axis side of the developing cover 25. The cylindrical portion 252 is a cylindrical structure protruding in the -X axis direction of the developing cover 25. The diameter of the cylindrical portion 252 is adapted to the diameter of the first rotating hole 131, that is, the cylindrical portion 252 can be installed in the first rotating hole 131 for rotation, that is, the developing unit 2 can be connected to the drum unit 1 through the developing cover 25, and the developing unit 2 can rotate around the rotating axis of the first rotating hole 131, thereby realizing a rotatable installation on the drum unit 1. The sleeve portion 253 is a tubular structure designed integrally with the cylindrical portion 252. The sleeve portion 253 is located on the +X axis side of the cylindrical portion 252 and is aligned with the axis of the cylindrical portion 252. The diameter of the sleeve portion 253 is greater than the diameter of the cylindrical portion 252. The sleeve portion 253 is used to surround a partial structure of the developing coupling 4.

[0072] like Figure 2 As shown, the first elastic member 3 is arranged on the -Z axis side of the drum unit 1 and the developing unit 2. In the X axis direction, the first elastic member 3 is located on the -X axis side of the developing unit 2, and in the Z axis direction, the first elastic member 3 is located on the -Z axis side (below) of the first rotating hole 131. In this embodiment, the first elastic member 3 adopts a compression spring, which can be compressed and release elastic potential energy in the Y axis direction. One end of the first elastic member 3 on the -Y axis side is connected to the drum unit 1, and one end of the first elastic member 3 on the +Y axis side is connected to the developing unit 2. Specifically, the -Z axis side of the photosensitive frame 12 is provided with a first abutting portion 121 in an abutting manner, as shown in FIG. Figure 3 As shown, the -Z axis side of the developer cover 25 is provided with a second abutting portion 251, the first abutting portion 121 and the second abutting portion 251 are arranged opposite to each other, and the first elastic member 3 is respectively abutted with the first abutting portion 121 and the second abutting portion 251 at both ends in the Y axis direction. When the developer unit 2 rotates forward around the rotation axis of the first rotating hole 131 ( Figure 4 When the developing cover 25 rotates clockwise for example, the second abutting portion 251 approaches the -Y axis direction of the drum unit 1, and the first elastic member 3 is compressed and deformed after being subjected to force, storing elastic potential energy. When the elastic potential energy of the first elastic member 3 is released, one end of the +Y axis side of the first elastic member 3 pushes out the second abutting portion 251, so that the developing unit 2 rotates in the opposite direction (counterclockwise) around the axis of the first rotating hole 131. In the absence of external force, the two ends of the first elastic member 3 are in a state of abutting the first abutting portion 121 and the second abutting portion 251.

[0073] like Figure 4As shown, the developing coupling 4 is arranged on the developing unit 2, and can drive the developing roller 23 to rotate. The developing coupling 4 is located on the -X axis side of the developing unit 2, and drives the developing gear 231 and the powder feeding gear 241 respectively through the gear structure, thereby driving the developing roller 23 and the powder feeding roller. The developing coupling 4 is a receiving mechanism for the driving force output by the image forming device, that is, it serves as the main driving force of the developing unit 2. The developing coupling 4 is arranged in the developing cover 25, that is, the developing cover 25 can be used to protect the developing coupling 4, wherein the -X axis side of the cylindrical portion 252 of the developing cover 25 is an open structure, and the developing coupling 4 is partially exposed outside the cylindrical portion 252, so that the developing coupling 4 can receive the driving force from the image forming device and drive the developing unit 2 to rotate after being buffered by the second elastic member 43.

[0074] like Figure 5 As shown, specifically, the developing coupling 4 includes a driving gear 41 and a driving head 42. The outer circumferential surface of the driving gear 41 has a two-layer gear structure, and the two-layer gear structures have different diameters, respectively driving the developing gear 231 and the powder feeding gear 241. The interior of the driving gear 41 has a hollow structure, and the interior of the driving gear 41 is provided with a protruding portion 412 protruding toward the -X axis direction, and a first clamping groove 413 and an annular groove for installing the second elastic member 43 are provided in the protruding portion 412, and the first clamping groove 413 is an opening structure on the annular groove. In addition, there is a space between the protruding portion 412 and the inner wall of the driving gear 41, and a force-bearing portion 411 is provided on the inner wall of the driving gear 41. The force-bearing portion 411 is a structure radially protruding along the inner wall of the driving gear 41, that is, the force-bearing portion 411 is also located in the above-mentioned space, and at least one force-bearing portion 411 is provided. It should be noted that the force-bearing portion 411 of this embodiment is located in the driving gear 41 and does not protrude from the end face of the driving gear 41 on the -X axis side.

[0075] like Figure 6As shown, the drive head 42 is a structure for receiving the driving force of the image forming device, that is, the -X axis side of the drive head 42 is used to receive the driving force of the image forming device, the drive head 42 is composed of two cylinders of different diameters, the interior of the drive head 42 has a hollow structure, and a second card groove 422 is provided inside the drive head 42, the second card groove 422 is a groove structure recessed along the -X axis direction of the drive head 42, and a force-applying portion 421 is provided on the outer circumferential surface of the +X axis side of the drive head 42. The force-applying portion 421 is formed by providing an opening (notch) on the outer circumferential surface of the +X axis side of the drive head 42, that is, the two ends of the opening are the force-applying portions 421, and specifically, the force-applying portion 421 is two abutting surfaces provided at the two ends of the opening, and the abutting surfaces abut against the force-receiving portion 411 to transmit the driving force. Specifically, the driving head 42 is installed in the driving gear 41 in the X-axis direction. At this time, the force-bearing part 411 is located in the open position, and there is a gap between the force-bearing part 411 and the force-applying part 421. When the driving head 42 is driven to rotate, the force-applying part 421 abuts against the force-bearing part 411, that is, the driving head 42 transmits the driving force to the driving gear 41, causing the driving gear 41 to rotate.

[0076] The second elastic member 43 is clamped in the developing coupling 4, and is specifically arranged between the driving head 42 and the driving gear 41. One end of the second elastic member 43 abuts against the driving gear 41, and the other end of the second elastic member 43 abuts against the driving head 42. Specifically, the second elastic member 43 adopts a torsion spring, and the second elastic member 43 has two ends. The torsional potential energy is stored and released by twisting the two ends. One end of the second elastic member 43 is clamped in the first clamping groove 413, and the other end of the second elastic member 43 is clamped in the second clamping groove 422. That is, when the driving head 42 is installed in the driving gear 41, the second elastic member 43 completes the clamping of the two ends, and after the clamping, a gap is formed between the force-applying part 421 and the force-receiving part 411, so that there is a reserved space when the driving head 42 rotates, thereby forming a buffering effect under the action of the second elastic member 43. At the same time, the second elastic member 43 is installed between the driving head 42 and the driving gear 41, which is conducive to saving space and protecting the second elastic member 43, and it is not easy to interfere with other parts.

[0077] Working principle: in the first state, that is, when the processing box needs to complete the developing task, the image forming device outputs the driving force to the driving head 42, and the driving head 42 rotates to drive the force-applying part 421 to rotate positively around the axial direction of the driving head 42, and the second elastic member 43 is twisted by force to store elastic potential energy. At the same time, the gap between the force-applying part 421 and the force-receiving part 411 shrinks and finally abuts against each other. The force-applying part 421 transmits the driving force to the force-receiving part 411 and drives the driving gear 41 to rotate positively. At this time, the rotation of the driving gear 41 will drive the developing roller 23 and the powder feeding roller to rotate, and the torsional force generated thereby will drive the developing unit 2 to rotate positively, that is, the developing unit 2 rotates positively around the axial direction of the first rotating hole 131, and overcomes the first elastic The elastic force of the first elastic member 3 causes the first elastic member 3 to compress and deform, thereby making the developing roller 23 abut against (contact) the photosensitive drum 11; in the second state, that is, when the processing box has no developing task, the image forming device stops outputting the driving force to the driving head 42, and the driving head 42 does not receive the driving force, that is, the driving head 42 is not affected by the driving force and is reset under the release of the elastic potential energy of the second elastic member 43, thereby making the force-applying part 421 and the force-receiving part 411 separated and there is a gap, and the driving gear 41 will not be rotated by the driving force, then the developing unit 2 no longer receives the torsional force, the elastic potential energy of the first elastic member 3 is released, and the deformation is restored, which prompts the developing unit 2 to rotate in the opposite direction, and finally separates the developing roller 23 from the photosensitive drum 11.

[0078] As can be seen from the above, when the image forming device does not perform a developing task and needs to separate the drum and roller of all the processing boxes, or when the image forming device performs a developing task that does not require the participation of the color processing box and needs to separate the drum and roller of the color processing box, since the developing unit 2 has no driving force source, the drum unit 1 and the developing unit 2 are in the second state. At this time, the drum unit 1 and the developing unit 2 are separated from the photosensitive drum 11 and maintained in a separated state under the action of the first elastic member 3; when the image forming device performs a developing task that requires the processing box to participate in the developing task, the developing coupling 4 receives the driving force from the image forming device. At this time, the drum unit 1 and the developing unit 2 are in the first state, and the developing unit 2 overcomes the action of the first elastic member 3 through torque (i.e., receives torsional force) so that the developing roller 23 contacts and maintains a contact state with the photosensitive drum 11. The second elastic member 43 can delay the process of transmitting the driving force to the driving gear 41 when the driving head 42 receives the driving force, that is, delay the generation of the torsional force that causes the developing unit 2 to rotate (in fact, delay the process of the developing unit 2 rotating in the forward direction), thereby buffering the contact process of the developing roller 23 approaching the photosensitive drum 11, thereby effectively ensuring the quality of the developing task.

[0079] It should be noted that the image forming device in this embodiment is provided with four processing boxes (including color processing boxes and non-color processing boxes), which are basically arranged horizontally, and the rotational driving force is respectively output from the driving shaft of the image forming device. The image forming device provides bias voltages (charging bias, developing bias, etc.) to the four processing boxes respectively, and the processing boxes are installed in the image forming device through a tray. Specifically, the tray is constructed to be able to move in a horizontal direction when the image forming device is installed on a horizontal surface. The four processing boxes are respectively installed at corresponding fixed positions of the tray. When the tray is moved into the image forming device, the four processing boxes are moved into the image forming device together with the tray. When the processing boxes need to be replaced, the four processing boxes can be moved together with the tray to the outside of the image forming device.

[0080] The image forming device in this embodiment has a drum drive coupling and a developer drive coupling. After the front door of the image forming device is closed, the drum drive coupling and the developer drive coupling for transmitting the driving force of the drive shaft to the processing box protrude in the +X axis direction. In addition, by opening the front door, the drum drive coupling and the developer drive coupling are retracted in the -X axis direction. The purpose of doing so is, on the one hand, to make the drum drive coupling and the developer drive coupling better connected to the photosensitive coupling 15 and the developer coupling 4 of the processing box respectively, so as to transmit the driving force; on the other hand, it can prevent the insertion / removal of the tray from being hindered.

[0081] By closing the front door and starting to drive the image forming apparatus, the drum drive coupling member is engaged with the photosensitive coupling 15, and the developing drive coupling member is engaged with the developing coupling 4 to transmit the driving force to the process cartridge. The drive transmission to the process cartridge is not limited to being realized at the two locations as described above, and the image forming apparatus may provide a mechanism for transmitting the drive only to the photosensitive coupling 15, which in turn transmits the drive to the developing roller 23; or a mechanism for transmitting the drive only to the developing coupling 4, which in turn transmits the drive to the photosensitive drum 11.

[0082] Embodiment 2

[0083] like Figures 7 to 10 As shown, most structures of this embodiment are the same as those of the first embodiment, except that the internal structure of the developing coupling 4 and the method of achieving drum-roller separation in this embodiment are different, but the same effect as in the first embodiment can be achieved.

[0084] like Figure 8As shown, in this embodiment, the first elastic member 3 adopts a tension spring, and the first elastic member 3 is arranged above the first rotating hole 131 (on the +Z axis side). The first elastic member 3 also has two ends that are subjected to force, one end is connected to the driving side end cover 13, and the other end is connected to the developing protective cover 25. The connection method can adopt a hanging structure, for example, a hook structure is set to limit the two ends of the first elastic member 3, so the first abutting portion 121 and the second abutting portion 251 are hook structures. Similarly, the first abutting portion 121 and the second abutting portion 251 are respectively arranged on the driving side end cover 13 and the developing protective cover 25. On the Z-axis side, and both are located above the first rotating hole 131, when the first elastic member 3 is not restricted by force (not deformed by force), the developing roller 23 and the photosensitive drum 11 are in a separated state; when the first elastic member 3 is restricted by force (deformed by force), the first abutment portion 121 and the second abutment portion 251 are relatively far apart, the two ends of the first elastic member 3 are stretched and deformed and are in a state of storing elastic potential energy, and the developing roller 23 and the photosensitive drum 11 are in a contact state; when the first elastic member 3 is deformed and restored, the elastic potential energy is released, and the developing roller 23 and the photosensitive drum 11 are in a separated state again.

[0085] like Fig. 9 As shown, in this embodiment, the driving gear 41 of the developing coupling 4 also has a force-bearing portion 411, and the driving head 42 has a force-applying portion 421, but the number of the force-bearing portion 411 and the force-applying portion 421 are both set to two, the force-bearing portion 411 radially protrudes from the inner wall of the driving gear 41, and in the X-axis direction, the force-bearing portion 411 is flush with the end face of the -X-axis side of the driving gear 41; the force-applying portion 421 radially protrudes from the outer circumferential surface of the driving head 42, and the two force-applying portions 421 can be relatively arranged on the driving head 42, and in the X-axis direction, the force-applying portion 421 is located in the middle position of the driving head 42, and when the driving head 42 is installed to the driving gear 41, the force-applying portion 421 and the force-bearing portion 411 can be in the same plane (the plane formed by the Y-axis direction and the Z-axis direction), and therefore can abut against each other.

[0086] The second elastic member 43 of the developing coupling 4 also adopts a torsion spring, and the two ends of the torsion spring are respectively clamped on the driving gear 41 and the driving head 42. The driving gear 41 has a first clamping groove 413, and the first clamping groove 413 is arranged on one of the force-bearing parts 411. The first clamping groove 413 is a groove structure concave along the radial direction of the driving gear 41. One end of the second elastic member 43 is clamped in the first clamping groove 413. Fig.10 As shown, the driving head 42 has a second slot 422, which is located on the +X-axis side of the force-applying portion 421. The other end of the second elastic member 43 is engaged in the second slot 422. Therefore, the second elastic member 43 can be installed between the driving gear 41 and the driving head 42. In addition, when the drum unit 1 and the developing unit 2 are in the second state, there is a gap between the force-applying portion 421 and the force-receiving portion 411.

[0087] The working principle of this embodiment is similar to that of the first embodiment. In the first state, after the developing coupling 4 is driven, that is, the driving head 42 rotates forward, the force-applying portion 421 abuts against the force-receiving portion 411, thereby driving the driving gear 41 to rotate forward. The torsional force generated by the rotation of the driving gear 41 drives the developing roller 23 and the powder feeding roller to rotate, causing the developing unit 2 to rotate forward around the axis of the first rotating hole 131, and the first elastic member 3 is stretched and deformed by the force, and the developing roller 23 abuts (contacts) with the photosensitive drum 11 and maintains a contact state; in the second state, the developing coupling 4 does not receive the driving force, and the driving head 42 is not affected by the driving force, then the developing unit 2 no longer receives the torsional force, and the elastic potential energy of the first elastic member 3 is released. Under the action of the first elastic member 3, the developing unit 2 rotates in the opposite direction, and the developing roller 23 separates from the photosensitive drum 11 and maintains a separated state.

[0088] At the same time, in this embodiment, when the developing roller 23 and the photosensitive drum 11 are converted from a separated state to a contact state, the second elastic member 43 can also delay the forward rotation process of the developing unit 2, thereby reducing the excessive impact tendency when the developing roller 23 contacts the photosensitive drum 11, and having a buffering effect.

[0089] Embodiment 3

[0090] like Figures 11 to 14 As shown, most structures of this embodiment are the same as those of the first embodiment, except that the first elastic member 3 is arranged at a different position through the external structure of the drum unit in this embodiment, and the drum-roller separation structure is different, but the same effect as in the first embodiment can be achieved.

[0091] like Fig.13 As shown, the photosensitive frame 12 of the present embodiment is provided with a first abutment portion 121, and the first abutment portion 121 is specifically located on the driving side end cover 13. The first abutment portion 121 is a protruding structure on the driving side end cover 13 protruding toward the -X direction, and can be a protruding rib on the driving side end cover 13. In the Z-axis direction, the first abutment portion 121 is closer to the +Z-axis side of the driving side end cover 13, and in the Y-axis direction, the first abutment portion 121 is closer to the -Y-axis side of the driving side end cover 13. A positioning column 133 is provided on the driving side end cover 13 of the photosensitive frame 12, which is a columnar structure protruding in the -X axis direction. In the Z axis direction, the positioning column 133 is located on the -Z axis side of the first abutment portion 121, and in the Y axis direction, the first abutment portion 121 is located on the +Y axis side of the first abutment portion 121. In addition, in the Y axis direction, the positioning column 133 overlaps with the first rotary hole 131, that is, the positioning column 133 is located between the two sides of the first rotary hole 131 in the Z axis direction. An anti-slip portion 1331 is also provided at the end of the positioning column 133, which is a protrusion designed integrally in the radial direction of the positioning column 133, so that the positioning column 133 forms a hook-shaped limiting structure.

[0092] like Fig.14 As shown, the developer cover 25 of this embodiment is provided with a second abutment portion 251, which is a structure protruding outward in the radial direction of the sleeve portion 253. In the X-axis direction, the second abutment portion 251 is closer to the box body 21 than the cylindrical portion 252. In the XZ plane formed by the X-axis direction and the Z-axis direction, the second abutment portion 251 presents an "L"-shaped structure.

[0093] like Figures 11 to 14 As shown, the processing box of this embodiment includes a first elastic member 3. The first elastic member 3 adopts a torsion spring and also has two ends subjected to force, including a first end 3a and a second end 3b. The torsion center of the first elastic member 3 can be installed on the positioning column 133. The anti-detachment portion 1331 can be used to prevent the first elastic member 3 from detaching from the positioning column 133. Therefore, the first elastic member 3 is also arranged between the two sides of the first rotating hole 131 in the Z-axis direction. The first end 3a of the first elastic member 3 abuts against the first abutting portion 121, and the second end 3b of the first elastic member 3 abuts against the second abutting portion 251. The specific abutment limit is within the "L"-shaped structure of the second abutting portion 251, so the first elastic member 3 can be subjected to force and limited.

[0094] The working principle of this embodiment is similar to that of the first embodiment. In the first state, after the developing coupling 4 is driven, the driving head 42 rotates forwardly and then drives the driving gear 41 to rotate forwardly. The torsional force generated by the rotation of the driving gear 41 drives the developing roller 23 and the powder feeding roller to rotate, so that the developing unit 2 rotates forwardly around the axis of the first rotating hole 131. The first elastic member 3 is restricted by force (elastic deformation is generated), and the torsional potential energy is stored. The developing roller 23 abuts (contacts) the photosensitive drum 11 and maintains a contact state; in the second state, the developing coupling 4 does not receive the driving force, the deformation of the first elastic member 3 is restored, and the torsional potential energy is released. Under the action of the first elastic member 3, the developing unit 2 rotates in the opposite direction, and the developing roller 23 is separated from the photosensitive drum 11 and remains in a separated state.

[0095] At the same time, in this embodiment, when the developing roller 23 and the photosensitive drum 11 are converted from a separated state to a contact state, the second elastic member 43 can be provided to delay the forward rotation process of the developing unit 2, thereby reducing the excessive impact tendency when the developing roller 23 contacts the photosensitive drum 11, thereby achieving a buffering effect.

[0096] Embodiment 4

[0097] like Figures 15 to 26 As shown, most structures of this embodiment are the same as those of the third embodiment, except that it further includes a retaining component 5, and the structures of the developing gear 231 and the developing cover 25 are different.

[0098] In this embodiment, reference Fig.17As shown, the developing gear 231 includes a developing gear portion 231a, a developing gear column 231c, and a developing gear protrusion 231b. The developing gear protrusion 231b is located on the side of the developing gear 231 away from the driving side bearing 22 along the X direction. The developing gear 231 is sleeved on the shaft of the developing roller through the developing gear column 231c and extends out of the driving side bearing 22. The developing gear 231 receives the rotational power of the developing coupling 4 through the developing gear portion 231a.

[0099] refer to Fig.18 As shown, the holding component 5 includes: a holding component positioning hole 5a, a second matching portion 5b, a separation holding portion 5c, a contact triggering portion 5d, and a holding component limiting portion 5e. The holding component 5 is connected to the developer protective cover 25 through the holding component positioning hole 5a, and can rotate on the developer protective cover 25 through a reset member 6. One end of the reset member 6 is connected to the second matching portion 5b of the holding component 5, and the other end is arranged on the developer protective cover 25. The contact triggering portion 5d is matched with the developer gear protrusion 231b on the side of the developer gear 231 away from the driving side bearing 22 along the X direction, so that the holding component 5 can rotate around the rotation axis of the holding component positioning hole 5a. The contact trigger portion 5d is located on the -Y axis side of the retaining component positioning hole 5a, and the contact trigger portion 5d is a protrusion structure; the separation retaining portion 5c is located on the -Y axis side of the contact trigger portion 5d, and the separation retaining portion 5c is also a protrusion structure; the second matching portion 5b is located on the -Z axis side (lower side) of the separation retaining portion 5c, and the second matching portion 5b is a protrusion / hook structure; the retaining component limiting portion 5e is arranged on the +Z axis side (upper side) of the retaining component positioning hole 5a, and the retaining component limiting portion 5e is an arc-shaped groove.

[0100] Combination Fig.19 As shown, the developer cover 25 is also provided with a retaining component positioning column 25c, which is connected with the retaining component positioning hole 5a so that the retaining component 5 can be rotatably connected to the developer cover 25. At the same time, the retaining component engaging portion 25d is provided to cooperate with the retaining component limiting portion 5e to limit the rotation range of the retaining component 5. The retaining component engaging portion 25d is a hook structure, which is engaged in the retaining component limiting portion 5e (arc groove) and can move within the range of the arc groove. The retaining component engaging portion 25d and the retaining component 5e can also prevent the retaining component 5 from falling out along the -X direction. The retaining component 5 is arranged near the lower end of the developer unit 2 in the height direction (Z direction). The developer cover 25 also includes a first matching portion 25e, which is connected to one end of the reset member 6, so as to realize the reset of the retaining component 5 on the developer cover 25. The reset member 6 is preferably a tension spring.

[0101] In this embodiment, reference Fig. 20As shown, further, a contact portion 134 is further provided on the driving side end cover 13, and the contact portion 134 is a protruding structure arranged on the +Y-axis side of the second rotating hole 132, and the contact portion 134 protrudes toward the +Y-axis direction, and cooperates with the separation retaining portion 5c on the retaining component 5. When the developing unit 2 is reversely rotated by the force of the first elastic member 3, the +Y-axis side surface of the contact portion 134 abuts against the -Y-axis side surface of the separation retaining portion 5c, thereby preventing the lower end of the developing unit 2 from moving toward the direction close to the photosensitive drum 11, which can better maintain the drum unit 1 and the developing unit 2 in the second state, that is, the retaining component 5 can better keep the developing roller 23 and the photosensitive drum 11 in a separated state.

[0102] like Figure 21 to Figure 23 , respectively, a partial view and a cross-sectional view of the driving side of the process cartridge when the process cartridge is in a drum-roller separation state. The following will describe them in detail.

[0103] In the transportation and storage stage before the process cartridge is used, or when the process cartridge is not performing a developing task in the image forming device, it is necessary to avoid long-term contact between the developing roller and the photosensitive drum 11. Fig.21 Partial position diagram, the first elastic member 3 of the process cartridge, specifically the first elastic member 3 is a torsion spring, which is sleeved on the positioning column 133 of the drive side end cover 13, and the second end 3b abuts against the second abutting portion 251 of the developer protective cover 25 ( Fig. 22 As shown), the first end 3a abuts against the first abutment portion 121 on the drive side end cover 13. In the second state, due to the force of the first elastic member 3 (torsion spring), the developing roller 23 on the developing unit 2 and the photosensitive drum 11 on the drum unit 1 are separated. At this time, the retaining component 5 is in the initial position, that is, the separation retaining portion 5c on the retaining component 5 and the contact portion 134 on the drive side end cover 13 are in a state of side surface abutment facing each other, and the retaining component limiting portion 5e on the retaining component 5 cooperates with the retaining component engaging portion 25d, and the retaining component engaging portion 25d abuts against a side surface of the retaining component limiting portion 5e (the side surface along the +Y direction), constraining the retaining component 5 to be in the initial position, so that the retaining component 5 can better keep the developing roller 23 and the photosensitive drum 11 in a separated state. At the same time, when in the initial position, the contact trigger portion 5d on the retaining component 5 is located within the trajectory of the developing gear protrusion 231b moving with the developing gear 231, and the reset member 6 is also in the initial state (elastic contraction position). For details, please refer to Fig.23 As shown, when the developing roller 23 and the photosensitive drum 11 are separated from each other, there is a distance H between them. At this time, the developing coupling 4 does not receive the driving force of the image forming device, and the developing gear 231 does not rotate.

[0104] refer to Figure 24 to Figure 26, further details are given of the partial view and cross-sectional view of the driving side of the process cartridge when it is in the drum-roller contact state. In the first state, Fig.24 The developing coupling 4 starts to rotate due to the driving force of the image forming device. Fig.25 , under the driving force of the image forming device, the developing coupling 4 rotates around the R1 direction (positive rotation). Since the torsional force generated by the rotation is large and greater than the force F of the first elastic member 3 on the second abutting portion 251, the developing unit 2 has a tendency to rotate positively, but since the separation holding portion 5c and the contact portion 134 are still in a state of side surface abutment at this time, the developing unit 2 cannot rotate positively. After the developing coupling 4 drives the developing gear 231 meshed with it to rotate around the R2 direction, the developing gear protrusion 231b touches the contact triggering portion 5d on the holding component 5 after the developing gear 231 rotates a certain angle, forcing the holding component 5 to rotate around the holding component positioning column 25c in the R3 direction, so that the separation holding portion 5c passes over the contact portion 134 in the R3 direction, and the separation holding portion 5c is misaligned with the contact portion 134 (at this time, the surface of the separation holding portion 5c on the -Z axis side abuts the surface of the contact portion 134 on the +Z axis side), and the reset member 6 is stretched and in the working state (elastic extension position) as the holding component 5 rotates. Since the separation retaining portion 5c is misaligned with the contact portion 134, the developing unit 2 can rotate forwardly under the action of the torsional force, and the developing roller 23 approaches the photosensitive drum 11 and contacts it. Under the action of the developing coupling 4 continuously driven by the image forming device, the developing roller 23 and the photosensitive drum 11 are maintained in a contact state, so that the toner on the developing roller 23 can be continuously transferred to the photosensitive drum 11, thereby completing the developing task of the processing box.

[0105] After being stretched, the reset member 6 has elastic potential energy to rotate and reset the retaining component 5 in the direction opposite to the direction of R3. However, since the surface on the -Z axis side of the separation retaining portion 5c abuts against the surface on the +Z axis side of the contact portion 134, the retaining component 5 cannot rotate in the opposite direction of R3, thereby ensuring that the retaining component 5 is in a rotationally constrained position to avoid interference between the developing gear protrusion 231b and the contact trigger portion 5d.

[0106] When the image forming device does not perform the developing task, the image forming device stops outputting the driving force, the developing coupling 4 does not receive the driving force, and the developing unit 2 rotates in the opposite direction under the action of the first elastic member 3 (torsion spring), driving the developing roller 23 to move in the direction away from the photosensitive drum 11 until it is separated from it by a certain distance. At the same time, the retaining component 5 is also driven to move in the direction away from the photosensitive drum 11, and the surface on the -Z axis side of the separation retaining portion 5c is disengaged from the surface on the +Z axis side of the contact portion 134. Under the action of the reset member 6, the retaining component 5 rotates in the opposite direction of R3 and resets to the +Y axis side surface of the contact portion 134 and abuts against the -Y axis side surface of the separation retaining portion 5c, so that the processing box is maintained in the second state, avoiding the deterioration of the developing roller 23 and / or toner and wear of the photosensitive drum 11 caused by long-term contact between the developing roller 23 and the photosensitive drum 11.

[0107] In this embodiment, when the developing roller 23 and the photosensitive drum 11 are converted from a separated state to a contact state, the forward rotation process of the developing unit 2 can be delayed by the action process of the retaining component 5, thereby reducing the tendency of excessive impact when the developing roller 23 and the photosensitive drum 11 are in contact, and has a buffering effect.

[0108] It should be noted that the retaining member 5 and the first elastic member 3 (torsion spring) of this embodiment are arranged at the driving end of the process box, or at the conductive end opposite to the driving end, or at both the driving end and the conductive end of the process box. Of course, the first elastic member 3 in the first to third embodiments can also be arranged in the same manner as above.

[0109] The above description is only a preferred embodiment of the present invention. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. This does not limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A process cartridge, detachably mounted on an image forming device, characterized in that: include: a drum unit rotatably provided with a photosensitive drum; A developing unit rotatably mounted on the drum unit, wherein the developing unit is rotatably provided with a developing roller; a first elastic member, one end of which is connected to the drum unit, and the other end of which is connected to the developing unit; A developing coupling, disposed on the developing unit, capable of driving the developing roller to rotate; In the first state, the image forming device drives the developing coupling to move, the developing coupling drives the developing unit to rotate in the positive direction, the first elastic member is deformed by force, and the developing roller contacts and maintains the contact state with the photosensitive drum; In the second state, the image forming device stops driving the developing coupling, the first elastic member recovers its deformation and drives the developing unit to rotate in the opposite direction, and the developing roller is separated from the photosensitive drum and remains in a separated state.

2. The process cartridge according to claim 1, wherein: It also includes a second elastic member, which is clamped in the developing coupling to enable the developing coupling to rotate after buffering, and the developing coupling drives the developing unit to rotate in the forward direction after rotating.

3. The process cartridge according to claim 2, wherein: The developing coupling comprises: A driving gear, used for transmitting driving force to drive the developing roller to rotate; a driving head, one end of which is mounted in the driving gear and the other end of which is driven by the image forming device; One end of the second elastic member is clamped with the driving gear, and the other end of the second elastic member is clamped with the driving head.

4. The process cartridge according to claim 3, wherein: The driving gear is provided with a first slot, the driving head is provided with a second slot, one end of the second elastic member is engaged with the first slot, and the other end of the second elastic member is engaged with the second slot.

5. The process cartridge according to claim 4, wherein: The driving head is provided with a force applying part, and the driving gear is provided with a force receiving part. In a first state, the driving head is driven by the image forming device, and the force applying part abuts against the force receiving part to drive the driving gear to rotate.

6. The process cartridge according to claim 5, wherein: The first clamping slot is arranged on the force-bearing portion.

7. The process cartridge according to claim 6, wherein: In the first state, the second elastic member is deformed by force, and the force-applying portion abuts against the force-receiving portion; in the second state, the second elastic member is restored to form a gap between the force-applying portion and the force-receiving portion.

8. The process cartridge according to any one of claims 1 to 7, characterized in that: The drum unit includes a photosensitive frame, which is provided with a first rotating hole; the developing unit includes a developing cover, one end of which is installed in the first rotating hole, and the developing unit can rotate around the first rotating hole; the first elastic member is arranged on both sides of the first rotating hole or between the two sides in the height direction.

9. The process cartridge according to claim 8, wherein: The first elastic member is disposed below the first rotating hole, one end of the first elastic member abuts against the photosensitive frame, and the other end of the first elastic member abuts against the developing protective cover.

10. The process cartridge according to claim 8, wherein: The first elastic member is disposed above the first rotating hole, one end of the first elastic member is connected to the photosensitive frame, and the other end of the first elastic member is connected to the developing protective cover.

11. The process cartridge according to claim 8, wherein: The first elastic member is arranged between the two sides of the first rotating hole in the height direction, the photosensitive frame is provided with a positioning column, the first elastic member is installed on the positioning column, one end of the first elastic member abuts against the photosensitive frame, and the other end of the first elastic member abuts against the developing cover.

12. The process cartridge according to claim 1, wherein: The invention also includes a retaining component disposed on the developing unit, and configured to keep the developing roller and the photosensitive drum separated from each other in the second state.

13. The process cartridge according to claim 12, wherein: The drum unit includes a photosensitive frame, and a contact portion is provided on the photosensitive frame; The holding member is provided with a separation holding portion, and in the second state, the separation holding portion abuts against the contact portion to hold the developing unit at a position where the developing roller is separated from the photosensitive drum.

14. The process cartridge according to claim 13, wherein: The holding component is rotatably disposed on the developing unit; The developing unit includes a developing gear meshed with a developing coupling. In a first state, the developing gear is driven to rotate by the developing coupling. When the developing gear rotates, it drives the retaining component to rotate so that the separation retaining portion is misaligned with the contact portion.

15. The process cartridge according to claim 14, wherein: The developing gear is provided with a developing gear protrusion, and the holding component is provided with a contact triggering portion. When the developing gear is driven to rotate, the developing gear protrusion triggers the contact triggering portion to rotate the holding component.

16. The process cartridge according to claim 15, wherein: It also includes a reset component, one end of which is connected to the retaining component, and the other end is connected to the developing unit. When the retaining component is triggered to rotate by the developing gear protrusion, the reset component is deformed; the deformation recovery of the reset component can cause the retaining component to rotate in the opposite direction and reset.

Images