Coupling and processing box

Abstract

A coupling and a process cartridge including: a support portion connected to a drum unit and transmitting a driving force of a driving transmission unit to the drum unit; the limiting part is located at the other end, opposite to the supporting part, of the coupler; the protrusion is located on the periphery of the limiting part and connected with the driving transmission unit, and the protrusion comprises a first connecting part, a second connecting part and a third connecting part. The coupling is connected with the driving transmission unit of the imaging equipment, the coupling and the driving transmission unit are connected in an abutting mode through a more stable structure to achieve transmission of rotation driving force, and the driving mode is simple in structure, convenient to install, stable in connection, smooth in driving force transmission and beneficial to efficient operation of the imaging equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of electrophotographic imaging equipment, in particular to a coupling and a processing cartridge. Background Art

[0002] In the field of electrophotographic imaging equipment, a photosensitive drum and a developing member acting on the photosensitive drum are integrally formed into a processing cartridge, and this processing cartridge can be detachably installed on the main assembly of the imaging equipment for easy maintenance or replacement. In a structure where the processing cartridge can be installed on and detached from the main assembly of the imaging equipment, there is a structure in which the main assembly and the processing cartridge are connected by using a coupling to input the driving force from the main assembly of the imaging equipment to the processing cartridge.

[0003] There is a type of driving transmission unit disclosed in Chinese Patent CN113574469A. It engages with a drum coupling through multiple components to drive and brake it. Most of the existing drum couplings adapted to this type of driving transmission unit are integrally formed parts, and only rely on their own structures to guide the multiple components of the driving transmission unit to respectively engage with their preset parts. Multiple guiding parts need to be provided on such drum couplings, and the alignment engagement is indirectly realized by guiding the translation and rotation of different components on the driving transmission unit. The guiding process is relatively complex, which may lead to unstable connection between the coupling and the main assembly of the electronic imaging equipment and unsmooth driving transmission. Summary of the Utility Model

[0004] According to one aspect of the present utility model, a coupling is provided. It is arranged at one end of a drum unit. The coupling can engage with a driving transmission unit of an imaging equipment, so as to form a driving connection with the driving transmission unit to drive the drum unit to rotate around a rotation axis. The coupling includes:

[0005] A supporting part, which is connected to the drum unit and transmits the driving force of the driving transmission unit to the drum unit;

[0006] A limiting part, which is located at the other end of the coupling opposite to the supporting part;

[0007] A protrusion, which is located on the outer periphery of the limiting part and engages with the driving transmission unit. The protrusion includes a first engaging part, a second engaging part and a third engaging part;

[0008] Wherein, the first engaging part is located at the end of the protrusion far from the supporting part and extends along the rotation direction of the coupling towards the drum unit;

[0009] Wherein, the second engaging part is located upstream of at least part of the first engaging part along the rotation direction;

[0010] Among them, the third engaging portion is located downstream of the second engaging portion along the rotation direction, and the plane where the third engaging portion is located is inclined with respect to the plane where the second engaging portion is located and intersects the plane where the first engaging portion is located.

[0011] In some embodiments, the third engaging portion is used to engage with the first braking force engaging member and / or the second braking force engaging member of the drive transmission unit.

[0012] In some embodiments, a limiting hole for accommodating the positioning boss of the drive transmission unit is provided in the limiting portion of the coupling.

[0013] In some embodiments, the first engaging portion is used to guide the first braking force engaging member and / or the second braking force engaging member of the drive transmission unit to access the coupling.

[0014] In some embodiments, the first engaging portion includes a planar guiding surface and an inclined guiding surface, and along the rotation direction, the inclined guiding surface is located downstream of the planar guiding surface.

[0015] In some embodiments, the second engaging portion is used to abut against the driving force transmission surface of the drive transmission unit.

[0016] In some embodiments, the second engaging portion is formed on the groove of the protrusion, and the second engaging portion is a force receiving surface parallel to the rotation axis of the coupling.

[0017] In some embodiments, when the coupling is projected along its rotation axis direction, the maximum angle between the two straight lines where the second engaging portion and the third engaging portion respectively intersect the limiting portion is less than 90°.

[0018] The present utility model also provides a processing cartridge, which includes a coupling according to any one of the above.

[0019] Advantages of the present utility model: The coupling driving method provided in this embodiment is simple, convenient for installation, and has stable connection. It can solve the problems of unstable connection between the coupling on the existing processing cartridge and the main component of the electrophotographic device, and unsmooth driving transmission, achieving the effects of stable driving connection and smooth driving force transmission, and improving the quality of the processing cartridge. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an existing electrophotographic device;

[0021] Figure 2 It is an exploded schematic diagram of the drive transmission unit of an existing electrophotographic device;

[0022] Figure 3Schematic diagram of the structure of an existing first braking force engaging member and a braking transmission member;

[0023] Figure 4 Cross-sectional view of an existing drive transmission unit;

[0024] Figure 5 Cutaway perspective view of an existing drive transmission unit;

[0025] Figure 6 Schematic diagram of the structure of an existing drive transmission unit; Schematic diagram of the structure of a processing cartridge at one angle provided by an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the structure of a processing cartridge at one angle provided by an embodiment of the present invention;

[0027] Figure 8 Schematic diagram of the structure of a processing cartridge at another angle provided by an embodiment of the present invention;

[0028] Figure 9 Schematic diagram of the structure of a coupling at one angle provided by an embodiment of the present invention;

[0029] Figure 10 Partially enlarged schematic diagram of the structure of a coupling at another angle provided by an embodiment of the present invention;

[0030] Figure 11 Schematic diagram of the structure of a coupling projected along the rotation axis direction according to an embodiment of the present invention;

[0031] Figure 12 Schematic diagram of the structure of a coupling and a drive transmission unit of an electrophotographic apparatus in a pre-engagement state according to an embodiment of the present invention;

[0032] Figure 13 Schematic diagram of the structure of a drive transmission unit of an electrophotographic apparatus being guided and engaged by a coupling according to an embodiment of the present invention;

[0033] Figure 14 Schematic diagram of the structure of a coupling and a drive transmission unit of an electrophotographic apparatus being engaged according to an embodiment of the present invention. Detailed description of the specific implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0038] In the above description, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean 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 utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0039] Such as Figure 1As shown, there is an existing electronic imaging device M. The structure and principle of this electronic imaging device M are basically the same as those of the electronic imaging device M disclosed in Patent No. CN113574469A. Only a brief description will be given below regarding the imaging device part. In the following description, components with the same reference numerals as those in the drawings of Patent No. CN113574469A belong to the same components and have the same structure and working principle.

[0040] The electronic imaging device M includes a main assembly 170, a drawer 171, and a door 11. A receiving portion, a drive transmission unit 203, a separation mechanism, a transfer unit, etc. are provided in the main assembly 170. The drawer 171 can accommodate a processing cartridge and can move relative to the main assembly 170 to install the processing cartridge into the receiving portion of the main assembly 170. The door 11 is provided on the outer side of the main assembly 170 and can open or close the receiving portion of the main assembly 170.

[0041] As Figures 2 to 6 shown, the drive transmission unit 203 provided on the main assembly 170 includes a driving force transmission component and a braking force application component. The driving force transmission component includes a rotating member 201 and a driving force transmission member 180. The rotating member 201 is rotatably supported on a support shaft 202. The driving force transmission member 180 is provided with a rotation stop portion 180b for receiving a driving force, a driving force transmission surface 180d for transmitting the driving force, and a positioning boss 180i for positioning. The driving force transmission member 180 is assembled on the rotating member 201 in a manner that it can move along the axial direction M1. Through the cooperation between the rotation stop portion 201b provided on the rotating member 201 and the rotation stop portion 180b provided on the driving force transmission member 180, the rotation of the rotating member 201 driving the driving force transmission member 180 is achieved.

[0042] The braking force application component includes a braking member 206, a first braking force engagement member 204, a second braking force engagement member 208, a first engagement spring 211, a second spring 210, and a braking transmission member 207. The braking member 206 includes a fixed side 206a and a rotating side 206b. The fixed side 206a is fixedly connected to the support shaft 202, and the rotating side 206b can rotate relative to the fixed side 206a and generate a braking force. The method of generating the braking force can be appropriately selected from those methods using friction and viscosity.

[0043] The first braking force engagement member 204 and the second braking force engagement member 208 are used to apply a braking force to the processing cartridge. The two can be assembled together by the engagement of a rotation stop protrusion 208c and a rotation stop recess 204c, and they can have a synchronous operation process. The second braking force engagement member 208 is located inside the first braking force engagement member 204, and there is a gap between the two.

[0044] The shaft portion 207b of the braking transmission member 207 passes through the through holes in the middle parts of the first braking force engagement member 204 and the second braking force engagement member 208 and is connected to the rotating side 206b of the braking member 206, so as to be able to transmit the braking force to the first braking force engagement member 204 and the second braking force engagement member 208.

[0045] Specifically, a protrusion 207e is provided on the flange portion 207a of the braking transmission member 207, and correspondingly, a protrusion 204e is provided on the flange portion 204a of the first braking force engagement member 204. When the protrusion 207e of the braking transmission member 207 engages with the protrusion 204e of the first braking force engagement member 204, the braking transmission member 207 can transmit the braking force to the first braking force engagement member 204.

[0046] One end of the first engagement spring 211 abuts against the end face 206d of the braking member 206, and the other end abuts against the flange portion 204a of the first braking force engagement member 204. The first engagement spring 211 is in a compressed state, and it applies an elastic force to the first braking force engagement member 204 in the M1B direction, and this elastic force can keep the protrusion 207e of the braking transmission member 207 engaged with the protrusion 204e of the first braking force engagement member 204.

[0047] The second spring 210 is a compression coil spring and is arranged to be sandwiched between and compressed between the end face 206d of the braking member 206 and the flange portion 207a of the braking transmission member 207. The second spring 210 applies a repulsive force (pushing force, elastic force) to each of the end face 206d of the braking member 206 and the flange portion 207a of the braking transmission member 207.

[0048] Among the components of the above driving transmission unit 203, under the action of the first engagement spring 211 and the second spring 210, the protrusion 207f at the end of the braking transmission member 207 in the axial direction M1A abuts against the contact surface 108f of the driving force transmission member 180. The movement of the driving force transmission member 180 in the arrow M1B direction is regulated (restricted) by the axial direction limiting portion 212, so that the driving force transmission member 180 will not fall off from the driving transmission unit 203 on the main assembly 170 side.

[0049] Among the components of the above driving transmission unit 203, the driving force transmission member 180 can move relative to the rotating member 201 in the M1A and M1B directions, the first braking force engagement member 204 and the second braking force engagement member 208 can move relative to the braking transmission member 207 and the rotating member 201 in the M1A and M1B directions, and can also move relative to the driving force transmission member 180 in the M1A and M1B directions. When the door cover 11 is closed, the driving force transmission member 180 moves in the M1B direction.

[0050] As Figure 7 and Figure 8 shown, this embodiment provides a processing cartridge 300 detachably mounted on the main component 170 of an electrophotographic apparatus M, including a photosensitive unit, a developing unit, a driving component, and a coupling 30. The developing unit includes a developing frame 310, a developing roller, a powder feeding roller, a stirring frame, and a blade. The photosensitive unit includes a photosensitive frame 320, a drum unit 321, a charging roller, and a cleaning blade.

[0051] The developing frame 310 encloses a powder bin for storing toner. The developing frame 310 is generally in the shape of a long box. At both ends of the developing frame 310 in the length direction, a driving side bearing 311 and a conductive side bearing 312 are respectively provided. The stirring frame, the powder feeding roller, and the developing roller are rotatably supported on the driving side bearing 311 and the conductive side bearing 312 at both ends of the developing frame 310 in the length direction. The stirring frame, the powder feeding roller, and the developing roller can rotate under the action of a driving unit. The axial directions of the stirring frame, the powder feeding roller, and the developing roller are all along the length direction of the developing frame 310. The toner in the powder bin is stirred by the stirring frame to prevent the toner in the powder bin from caking, and at the same time, the toner can be conveyed towards the powder feeding roller. The powder feeding roller conveys the toner to the developing roller and the charged developing roller adsorbs the toner.

[0052] As Figure 7 and Figure 8 shown, the photosensitive frame 320 encloses a waste toner bin for collecting waste toner. The photosensitive frame 320 also has a length direction, and its length direction is the same as that of the developing frame 310. The drum unit 321 is provided on the photosensitive frame 320, and the drum unit 321 is fixedly connected to the coupling 30. The drum unit 321 is rotatably supported at both ends of the photosensitive frame 320 in the length direction. Specifically, the drum unit 321 is provided at the lower end side of the photosensitive frame 320 in the height direction. The waste toner bin is arranged along the length direction of the photosensitive frame 320, and the waste toner bin is located on one side of the drum unit 321. The toner adsorbed by the developing roller transfers the toner to the drum unit 321 through the potential difference between the developing roller and the drum unit 321. After transfer, the cleaning blade is in linear contact with the drum unit 321 to clean the toner that has not been completely transferred on the surface of the drum unit 321, that is, waste toner. The cleaned waste toner is stored in the waste toner bin. The charging roller is used to charge the surface of the drum unit 321 with uniform charge so that the drum unit 321 can adsorb toner.

[0053] As Figure 7 and Figure 8As shown, the driving assembly includes a developing coupling 331, a developing roller gear, a powder feeding roller gear, and a stirring frame gear. The driving assembly can be disposed at one or both ends of the processing cartridge 300 in the length direction. In this embodiment, the driving assembly is disposed at the same end of the developing unit in the length direction. The developing coupling 331, the developing roller gear, the powder feeding roller gear, and the stirring frame gear are disposed outside the driving side bearing 311. Specifically, a support hole for supporting the developing coupling 331 is provided on the driving side bearing 311. The developing coupling 331 is used to engage with the driving force of the electrophotographic apparatus and receive the driving force. The developing roller gear is sleeved on one end of the shaft of the developing roller extending out of the driving side bearing 311. The powder feeding roller gear is sleeved on one end of the shaft of the powder feeding roller extending out of the driving side bearing 311. The stirring frame gear is sleeved on one end of the stirring frame extending out of the driving side bearing 311. The developing roller gear, the powder feeding roller gear, and the stirring frame gear are directly or indirectly engaged with the developing coupling 331 to transmit the driving force received by the developing coupling 331, thereby driving the developing roller, the powder feeding roller, and the stirring frame to rotate.

[0054] As Figure 7 shown, a developing cartridge cover 313 is further provided outside the driving side bearing 311. The developing cartridge cover 313 covers the developing roller gear, the powder feeding roller gear, the stirring frame gear, and a part of the developing coupling 331, and can play a role in protecting the driving assembly. Specifically, a cylindrical portion is provided on the developing cartridge cover 313. The cylindrical portion protrudes along the side away from the developing frame 310. The inside of the cylindrical portion is hollow, and its axis extends along the length direction of the developing frame 310. A part of the developing coupling 331 passes through the inside of the cylindrical portion and extends out of the developing cartridge cover 313.

[0055] As Figure 7 and Figure 8 shown, the processing cartridge 300 further includes end caps. The end caps are disposed at both ends of the processing cartridge 300 in the length direction, namely a driving side end cap 314 and a conductive side end cap 315 respectively. The conductive side end cap 315 covers the outside of the conductive side bearing 312. The driving side end cap 314 covers the outside of the developing cartridge cover 313. When viewed along the length direction of the processing cartridge 300, the driving side end cap 314 and the developing cartridge cover 313 at least partially overlap. The driving side end cap 314 and the conductive side end cap 315 both cover at least a part of the ends of the photosensitive frame 320 and the developing frame 310 respectively. The driving side end cap 314 is fixedly connected to the end of the photosensitive frame 320.

[0056] In this embodiment, a first through hole and a second through hole are provided on the driving side end cap 314. When the driving side end cap 314 is installed at the ends of the developing frame 310 and the photosensitive frame 320, a part of the coupling assembly is exposed through the first through hole, and a part of the developing coupling 331 is exposed through the second through hole, so that the coupling can engage with the driving head of the electrophotographic apparatus to receive the driving force.

[0057] AsFigure 9 and Figure 10 As shown, this embodiment provides a coupling 30 applicable to the above-mentioned processing cartridge. The coupling 30 can engage with the drive transmission unit 203 of the electrophotographic imaging device M. Specifically, it engages with the driving force transmission member 180 to receive the driving force from the electrophotographic imaging device M and transmit the driving force to the drive assembly of the processing cartridge to drive the drum unit 321 provided in the processing cartridge.

[0058] The coupling 30 can be provided at the end of the drum unit 321 and rotate about the rotation axis X along the rotation direction H together with the drum unit 321. Among them, the coupling 30 includes a driving force receiving portion, a support portion 302, and a limiting portion 303. In this embodiment, a support portion 302 is provided at one end of the coupling 30, so that the coupling 30 is connected to the end of the drum unit 321 to transmit the driving force received by the coupling 30 to the drum unit 321. A limiting portion 303 is provided at the other end of the coupling 30 opposite to the support portion 302, that is, after the coupling 30 is assembled on the drum unit 321, the limiting portion 303 is located at the end of the support portion 302 away from the drum unit 321, and a limiting hole 303a is provided in the limiting portion 303 to receive and accommodate a positioning boss 180i provided on a part of the driving force transmission member 180 of the driving transmission unit 203. The driving force receiving portion is configured as a protrusion 301 located on the outer periphery of the limiting portion 303 and engaged with the driving transmission unit. Preferably, two protrusions 301 are symmetrically arranged along the rotation axis X on both sides of the limiting portion 303. Specifically, the protrusion 301 includes a first engaging portion 301a, a second engaging portion 301b, and a third engaging portion 301c. Among them, the first engaging portion 301a is located on the side of the protrusion 301 away from the support portion 302 and extends along the rotation direction towards the support portion 302. The first engaging portion 301a includes a planar guiding surface 301a1 and an inclined guiding surface 301a2. The planar guiding surface 301a1 is provided at the end closer to the side of the limiting portion 303 away from the support portion 302 to prevent the first braking force engaging member 204 and / or the second braking force engaging member 208 of the driving transmission unit 203 from accessing the coupling 30 from a non-predetermined position; the inclined guiding surface 301a2 guides the first braking force engaging member 204 and the second braking force engaging member 208 to rotate and extend into the coupling 30 along the rotation direction. Among them, in the same protrusion 301, the second engaging portion 301b is located at least partially upstream of the first engaging portion 301a along the rotation direction H (that is, the second engaging portion 301b is not located downstream of the first engaging portion 301a). Specifically, the second engaging portion 301b is formed on a groove of the protrusion 301. The second engaging portion 301b is a driving force receiving surface and abuts against the driving force transmission surface 180d provided on the driving force transmission member 180 to receive the driving force. Preferably, the second engaging portion 301b is a vertical (i.e., parallel to the rotation axis X) force receiving surface. Among them, in the same protrusion 301, the third engaging portion 301c is located downstream of the second engaging portion 301b along the rotation direction H (for reference, see Figure 11) and the third engaging portion 301c is arranged to be able to engage the inclined surfaces of the first braking force engaging member 204 and / or the second braking force engaging member 208. The plane where the third engaging portion 301c is located is inclined with respect to the plane where the second engaging portion 301b is located, and the plane where the third engaging portion 301c is located intersects with the plane where the first engaging portion 301a is located, that is, the plane where the third engaging portion 301c is located is inclined with respect to the rotation axis X. With such an arrangement, the engagement between the drive transmission unit 203 and the coupling 30 and the force transmission process are made more stable.

[0059] As Figure 11 shown, when projected along the rotation axis X direction of the drum unit 321, the boundaries where the second engaging portion 301b and the third engaging portion 301c intersect with the limiting portion 303 respectively form straight lines L1 and L2. The included angle formed between the straight line L1 and the straight line L2 controls the size of the protrusion 301. When the included angle is less than 90°, the drive transmission unit 203 can be stably engaged with the coupling 30. When the included angle is greater than 90°, interference is likely to occur during the process of the first braking force engaging member 204 and the second braking force engaging member 208 extending into the coupling 30, and even the drive transmission unit 203 cannot be engaged with the coupling 30. Therefore, the maximum included angle formed by the two straight lines L1 and L2 on the protrusion 301 is preferably less than 90°.

[0060] As Figures 12 to 14 shown, it illustrates the engagement process of the coupling 30 with the driving force transmission member 180 part of the drive transmission unit 203. As Figure 12 shown, it is the pre-engagement state (when the door cover 11 is not closed) of the coupling 30 with the driving force transmission member 180 of the drive transmission unit 203, and there is a spacing between the coupling 30 and the driving force transmission member 180 part of the drive transmission unit 203; as Figure 13 shown, it is the engagement process of the coupling 30 with the driving force transmission member 180 part of the drive transmission unit 203. When the door cover 11 is closed to perform the developing work on the processing cartridge, the driving force transmission member 180 part of the drive transmission unit 203 moves along the M1B direction and rotates along the rotation direction H. At this time, the positioning boss 180i enters the limiting hole 303a of the limiting portion 303, and the first braking force engaging member 204 and the second braking force engaging member 208 abut against the first engaging portion 301a and slide along the plane guiding surface 301a1 and the inclined guiding surface 301a2 in the rotation direction. At this time, the driving force transmission member 180 part of the drive transmission unit 203 extends into the coupling 30 along the M1B direction; as Figure 14As shown, the first braking force engaging member 204 and the second braking force engaging member 208 are guided by the first engaging portion 301a to engage with the third engaging portion 301c. At the same time, the second engaging portion 301b abuts against the driving force transmission surface 180d. Thus, the driving transmission unit 203 is stably engaged with the coupling 30 to transmit the driving force smoothly.

[0061] The coupling driving method provided in the processing cartridge of this embodiment is simple, easy to install, and has a stable connection. It can solve the problems of unstable connection between the coupling and the main component of the electrophotographic apparatus and unsmooth driving force transmission existing in the existing processing cartridge, achieving the effects of stable driving connection and smooth driving force transmission, and improving the quality of the processing cartridge.

[0062] This driving method has a simple structure, is easy to install, has a stable connection, and smooth driving force transmission, which is beneficial to the efficient operation of the imaging apparatus.

[0063] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can be made, or the above technical solutions can be freely combined, including freely combining the technical features between the above different embodiments. All of these belong to the protection scope of the present invention.

Claims

1. A coupling, which is provided at one end of a drum unit, can be engaged with a drive transmission unit of an imaging device, and thus forms a drive connection with the drive transmission unit to drive the drum unit to rotate about a rotation axis, characterized in that The coupling includes: a support portion, which is connected to the drum unit and transmits the driving force of the drive transmission unit to the drum unit; a limiting portion, which is located at the other end of the coupling opposite to the support portion; a protrusion, which is located on the outer periphery of the limiting portion and engages with the drive transmission unit. The protrusion includes a first engaging portion, a second engaging portion, and a third engaging portion; wherein, the first engaging portion is located at one end of the protrusion away from the support portion and extends along the rotation direction of the coupling towards the drum unit; wherein, the second engaging portion is located upstream of at least part of the first engaging portion along the rotation direction; wherein, the third engaging portion is located downstream of the second engaging portion along the rotation direction. The plane where the third engaging portion is located is inclined with respect to the plane where the second engaging portion is located and intersects with the plane where the first engaging portion is located.

2. The coupling according to claim 1, wherein, The third engaging portion is used to engage with the first braking force engaging member and / or the second braking force engaging member of the drive transmission unit.

3. The coupling according to claim 1, characterized in that, A limiting hole for accommodating the positioning boss of the drive transmission unit is provided in the limiting portion of the coupling.

4. The coupling according to claim 1, wherein The first engaging portion is used to guide the first braking force engaging member and / or the second braking force engaging member of the drive transmission unit to access the coupling.

5. The coupling according to claim 4, characterized in that, The first engaging portion includes a planar guiding surface and an inclined guiding surface. Along the rotation direction, the inclined guiding surface is located downstream of the planar guiding surface.

6. The coupling according to claim 1, characterized in that, The second engaging portion is used to abut against the driving force transmission surface of the drive transmission unit.

7. The coupling according to claim 6, characterized in that, The second engaging portion is formed on a groove of the protrusion, and the second engaging portion is a force receiving surface parallel to the rotation axis of the coupling.

8. The coupling according to claim 1, characterized in that, When the coupling is projected along its rotation axis direction, the maximum angle between two straight lines where the second engaging portion and the third engaging portion respectively intersect with the limiting portion is less than 90°.

9. A processing cartridge, characterized in that, It includes the coupling according to any one of claims 1 to 8.

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