Processing box

Abstract

The utility model discloses a processing box which is detachably arranged on electronic imaging equipment, a drum driving transmission unit can telescopically move in the axial direction, the direction close to the processing box is an extension direction, and the direction far away from the processing box is a retraction direction; the drum driving transmission unit is internally provided with a braking force applying assembly and a driving force transmission component; a photosensitive drum rotatably supported on the drum frame; a drum coupling provided at one end of the photosensitive drum for engaging with the drum drive transmission unit and receiving the driving force to rotate in a rotation direction A; the drum coupling comprises an extrusion part acting on the braking force applying assembly, and the drum coupling abuts against the braking force applying assembly to enable the braking force applying assembly to move in the retraction direction in the process that the drum coupling is connected with the drum drive transmission unit, so that abnormal sound generated when the drive transmission unit rotates is reduced or eliminated. The extrusion part is arranged on the drum coupling and acts with the braking force applying assembly, so that the problem that abnormal sound exists when the driving transmission unit rotates is relieved or eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic imaging devices, in particular to a processing cartridge. Background Art

[0002] There is a driving transmission unit disclosed in a Chinese patent CN113574469A, which is engaged with a drum coupling through a plurality of components to drive and brake it.

[0003] In the prior art, printing and developing are realized by contacting the photosensitive drum on the drum unit of the processing cartridge (toner cartridge) with the developing roller on the developing unit. The processing cartridge does not have a cleaning device for contacting the photosensitive drum and removing toner (carbon powder) on the surface of the photosensitive drum. That is, there are no components such as a cleaning blade contacting the photosensitive drum on the drum unit of the processing cartridge. Therefore, the torque required for the drum unit 109 (photosensitive drum 104) of the processing cartridge is relatively small. In this structural case, the drum unit 109 is easily affected by the surrounding environment when driven by the printer. Therefore, the drum unit 109 may be affected externally, resulting in unstable rotation speed. For example, in the prior art, the developing roller 106, the charging roller 105, and the transfer belt 12a contact the photosensitive drum 104. If the magnitude of the frictional force generated between these devices and the photosensitive drum 104 fluctuates, the speed of the photosensitive drum 104 may fluctuate.

[0004] Moreover, in the prior art, the braking force is applied inside the driving head of the machine to the processing cartridge. This application method requires the machine driving head and the processing cartridge driving head to be fully combined before the OPC braking force can be provided. Such a machine structure is relatively complex, and at the same time, the photosensitive drum coupling structure of the corresponding processing cartridge is also relatively complex. During the pre-start detection process of the printer, the machine driving head and the processing cartridge driving head need to be engaged multiple times or run for a long time before they can be effectively matched. During this process, there will be an obvious abnormal noise between the braking force application component inside the driving head and the driving head. Summary of the Utility Model

[0005] According to one aspect of the present utility model, there is provided a processing cartridge detachably installed in an electronic imaging device, the electronic imaging device including a drum driving transmission unit capable of axially telescoping and moving, the extending direction being the direction close to the processing cartridge, and the retracting direction being the direction away from the processing cartridge; a braking force application assembly and a driving force transmission member are provided inside the drum driving transmission unit, and the processing cartridge includes:

[0006] A drum frame;

[0007] A photosensitive drum rotatably supported on the drum frame;

[0008] A drum coupling provided at one end of the photosensitive drum for engaging with the drum driving transmission unit and receiving a driving force to rotate in the rotational direction A;

[0009] The drum coupling includes a pressing portion acting on the braking force applying assembly. During the process of the drum coupling engaging with the drum drive transmission unit, it abuts against the braking force applying assembly to move the braking force applying assembly in the retracting direction, thereby reducing or eliminating abnormal noise during the rotation of the drive transmission unit.

[0010] In some embodiments, the pressing portion protrudes from the end face of the drum coupling, and the number of the pressing portions is at least one.

[0011] In some embodiments, the drum coupling includes a driving force receiving portion that protrudes from the end face of the drum coupling. The side surface of the driving force receiving portion on the upstream side in the rotation direction A is the driving force receiving surface.

[0012] In some embodiments, the pressing portion is located on the downstream side of the driving force receiving portion in the rotation direction A.

[0013] In some embodiments, the height of the pressing portion protruding from the end cover of the drum coupling is lower than the height of the driving force receiving portion protruding from the end face of the drum coupling.

[0014] In some embodiments, the driving force receiving portion is a first protrusion, the pressing portion is a second protrusion, and one end of the first protrusion is connected to one end of the second protrusion.

[0015] In some embodiments, the pressing portion is a frustum structure.

[0016] In some embodiments, a third annular protrusion is provided on the end face of the drum coupling, and the pressing portion is located inside the third annular protrusion.

[0017] In some embodiments, there is a gap between the third annular protrusion and the frustum structure, and the height of the frustum structure is lower than the height of the third annular protrusion.

[0018] In some embodiments, a notch portion is provided on the third annular protrusion, and one side surface of the notch portion in the circumferential direction is the driving force receiving surface.

[0019] In some embodiments, a notch portion is provided on the third annular protrusion, a driving force receiving portion is provided on the inner wall of the third annular protrusion, the position of the driving force receiving portion corresponds to the position of the notch portion, and the end face of the driving force receiving portion facing the retracting direction is the driving force receiving surface.

[0020] In some embodiments, the side surface of the driving force receiving portion on the downstream side in the rotation direction A is the braking force receiving surface.

[0021] In some embodiments, one end of the braking force receiving surface in the extending direction is connected to one end of the pressing portion in the retracting direction.

[0022] In some embodiments, the braking force receiving surface is a surface inclined with respect to the axis of the drum coupling. Along the retracting direction, the braking force receiving surface is inclined toward the upstream side in the rotational direction A.

[0023] In some embodiments, the braking force receiving surface is a straight surface parallel to the axis of the drum coupling.

[0024] In some embodiments, the processing cartridge further includes a braking member for providing a braking force to the photosensitive drum.

[0025] In some embodiments, a conductive bearing is provided at the other end of the photosensitive drum opposite to the coupling, and the braking member is disposed on the conductive bearing and / or the drum coupling.

[0026] In some embodiments, the braking member is a torsion spring.

[0027] In some embodiments, the coil portion of the torsion spring is sleeved on the circumferential outer wall of the conductive bearing and / or the drum coupling and holds the conductive bearing and / or the drum coupling tightly. The arm portion of the torsion spring abuts against the drum frame. When the photosensitive drum rotates, the torsion force of the torsion spring generates a braking force on the photosensitive drum.

[0028] In some embodiments, a conductive shaft pin is further included. After a part of the conductive shaft pin exceeds the through hole on the drum frame, it is inserted into the conductive bearing. The coil portion of the torsion spring is sleeved on the conductive shaft pin and holds the conductive shaft pin tightly. The arm portion of the torsion spring abuts against the conductive bearing. When the photosensitive drum rotates, the torsion force of the torsion spring generates a braking force on the photosensitive drum.

[0029] In some embodiments, ribs for abutting against the arm portion of the torsion spring are provided on the inner wall of the conductive bearing.

[0030] In some embodiments, the braking member is disposed between the conductive bearing and the drum frame, and / or the braking member is disposed between the drum coupling and the drum frame;

[0031] The braking member can be squeezed and deformed to generate a frictional force between the conductive bearing and the drum frame, and / or generate a frictional force between the drum coupling and the drum frame;

[0032] So the frictional force provides a braking force acting on the photosensitive drum.

[0033] In some embodiments, the braking member is disposed on the end face or the circumferential outer wall of the conductive bearing, and / or the braking member is disposed on the circumferential outer wall of the drum coupling.

[0034] In some embodiments, an annular groove for mounting the braking member is provided on the circumferential outer wall of the conductive bearing and / or the drum coupling. When the braking member is mounted in the annular groove, at least a part of it protrudes from the circumferential outer wall of the conductive bearing and / or the drum coupling.

[0035] In some embodiments, the braking member is a rubber ring or a rubber washer.

[0036] In some embodiments, the drum coupling includes a limiting portion for limiting or preventing relative inclination when the drum drive transmission unit is engaged with the drum coupling.

[0037] In some embodiments, the limiting portion includes a first annular protrusion provided on the circumferential periphery of the drum coupling.

[0038] In some embodiments, the first annular protrusion protrudes in the retracting direction, and the inner diameter of the first annular protrusion is adapted to the outer diameter of the cylindrical portion of the driving force transmission member; when the driving force transmission member extends in the extending direction and is engaged with the drum coupling, the cylindrical portion extends into the first annular protrusion and fits with the first annular protrusion.

[0039] In some embodiments, the limiting portion includes a second annular protrusion provided at the axial center position of the drum coupling.

[0040] In some embodiments, the second annular protrusion protrudes from the end face of the drum coupling in the retracting direction, and the inner diameter of the second annular protrusion is adapted to the outer diameter of the positioning boss of the driving force transmission member; when the driving force transmission member extends in the extending direction and is engaged with the drum coupling, a part of the positioning boss extends into the second annular protrusion and fits with the second annular protrusion.

[0041] In some embodiments, the limiting portion includes an abutting protrusion protruding from the end face of the drum coupling.

[0042] In some embodiments, the abutting protrusion and the driving force receiving portion have a circumferential interval, and the interval is adapted to the circumferential width of the driving force transmission portion of the driving force transmission member; when the driving force transmission member extends in the extending direction and is engaged with the drum coupling, at least a part of the driving force transmission portion is inserted into the interval between the abutting protrusion and the driving force receiving portion and abuts against both of them.

[0043] Advantages of the present utility model: By providing an extrusion part on the drum coupling to interact with the braking force application component, the present utility model reduces or eliminates the problem of abnormal noise during the rotation of the drive transmission unit. In addition, by providing a braking member for providing braking force on the processing cartridge, it is possible to ensure that the photosensitive drum does not rotate when the electrophotographic apparatus is just started, and it is easier and faster to stably engage with the drum drive transmission unit and rotate stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 FIG. is a schematic structural diagram of an existing electrophotographic apparatus;

[0045] Figure 2 FIG. is an exploded schematic diagram of a drum driving force transmission unit of an existing electrophotographic apparatus;

[0046] Figure 3 FIG. is a schematic structural diagram of an existing first braking force engaging member and a braking transmission member;

[0047] Figure 4 FIG. is a cross-sectional view of an existing drum driving force transmission unit;

[0048] Figure 5 FIG. is a cutaway perspective view of an existing drum driving force transmission unit;

[0049] Figure 6 FIG. is a schematic structural diagram of an existing drum coupling;

[0050] Figure 7 FIG. is a schematic overall structure diagram of a processing cartridge according to Embodiment 1 of the present utility model from one angle;

[0051] Figure 8 FIG. is a schematic overall structure diagram of a processing cartridge according to Embodiment 1 of the present utility model from another angle;

[0052] Figure 9 FIG. is a partial exploded schematic diagram of a processing cartridge according to Embodiment 1 of the present utility model;

[0053] Figure 10 FIG. is a schematic structural diagram of a drum coupling according to Embodiment 1 of the present utility model from one angle;

[0054] Figure 11 FIG. is a schematic structural diagram of a drum coupling according to Embodiment 1 of the present utility model from another angle;

[0055] Figure 12 FIG. is a schematic structural diagram of a driving force transmission member of a drum driving force transmission unit from one angle;

[0056] Figure 13 FIG. is a cross-sectional view of the engagement of a drum coupling and a driving force transmission member according to Embodiment 1 of the present utility model;

[0057] Figure 14Partial exploded view of the conductive end of the processing cartridge according to the first embodiment of the present utility model;

[0058] Figure 15 Cross-sectional view of the conductive end of the processing cartridge according to the first embodiment of the present utility model;

[0059] Figure 16 Structural diagram of the drum coupling according to the second embodiment of the present utility model;

[0060] Figure 17 Structural diagram of the drum coupling according to the third embodiment of the present utility model;

[0061] Figure 18 Structural diagram of the drum coupling according to the fourth embodiment of the present utility model;

[0062] Figure 19 Partial exploded view of the conductive end of the processing cartridge according to the fifth embodiment of the present utility model;

[0063] Figure 20 Cross-sectional view of the conductive end of the processing cartridge according to the fifth embodiment of the present utility model;

[0064] Figure 21 Partial exploded view of the conductive end of the processing cartridge according to the sixth embodiment of the present utility model;

[0065] Figure 22 Cross-sectional view of the conductive end of the processing cartridge according to the sixth embodiment of the present utility model;

[0066] Figure 23 Partial structural diagram of the drum coupling and the photosensitive drum according to the seventh embodiment of the present utility model;

[0067] Figure 24 Partial exploded view of the drum coupling and the photosensitive drum according to the seventh embodiment of the present utility model;

[0068] Figure 25 Structural diagram of the photosensitive drum and the drum coupling according to the eighth embodiment of the present utility model;

[0069] Figure 26 Exploded view of the drum coupling and the braking member according to the eighth embodiment of the present utility model;

[0070] Figure 27 Partial cross-sectional view of the drive end of the processing cartridge according to the eighth embodiment of the present utility model;

[0071] Figure 28 Partial cross-sectional view of the conductive end of the processing cartridge according to the eighth embodiment of the present utility model;

[0072] Figure 29 Structural diagram of the drum coupling at an angle according to the ninth embodiment of the present utility model;

[0073] Figure 30 Schematic structural view of the drum coupling of the ninth embodiment of the present utility model from another angle;

[0074] Figure 31 Schematic structural view of the driving force transmission member of the drum driving force transmission unit from another angle;

[0075] Figure 32 Schematic structural view of the drum coupling of the tenth embodiment of the present utility model;

[0076] Figure 33 Schematic structural view of the drum coupling of the eleventh embodiment of the present utility model from one angle;

[0077] Figure 34 Schematic structural view of the drum coupling of the eleventh embodiment of the present utility model from another angle;

[0078] Figure 35 Schematic structural view of the drum coupling of the twelfth embodiment of the present utility model;

[0079] Figure 36 Schematic structural view of the drum coupling of the thirteenth embodiment of the present utility model from one angle;

[0080] Figure 37 Schematic structural view of the drum coupling of the thirteenth embodiment of the present utility model from another angle. Detailed implementation manner

[0081] The present utility model 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 utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0082] 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", "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0083] In the present utility model, unless otherwise clearly defined or limited, terms such as "installation", "connection", "fixation", 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 communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. 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.

[0084] In the present utility model, unless otherwise clearly defined or 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 in indirect 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 has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" 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 has a lower horizontal height than the second feature.

[0085] In the above description, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present 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.

[0086] As Figure 1 shown, there is an existing electronic imaging device M. The structure and principle of the 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 electronic imaging device M. In the following description, the reference numerals that are the same as those in the drawings of Patent No. CN113574469A belong to the same components and have the same structure and working principle.

[0087] The electrophotographic imaging apparatus M includes a main assembly 170, a tray 171, and a door 11. An accommodation portion, a drum drive transmission unit 203, a separation mechanism, a transfer unit, etc. are provided in the main assembly 170. The tray 171 can accommodate the processing cartridge 100 and can move relative to the main assembly 170 to install the processing cartridge 100 into the accommodation 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 accommodation portion of the main assembly 170.

[0088] As Figure 1 shown, four processing cartridges 100 (100Y, 100M, 100C, 100K) are provided in the main assembly 170, namely, a first processing cartridge 100Y, a second processing cartridge 100M, a third processing cartridge 100C, and a fourth processing cartridge 100K. The four processing cartridges 100 are arranged substantially horizontally. Rotational driving forces are respectively provided from the drive output portion of the main assembly 170 to the first to fourth processing cartridges 100 (100Y, 100M, 100C, 100K) to supply bias voltages (charging bias voltage, developing bias voltage, etc.). The processing cartridges are installed into the main assembly 170 through a tray 171. Specifically, the tray is configured to be able to move along a substantially horizontal direction in a state where the main assembly 170 is installed on a horizontal surface, and the four processing cartridges are respectively installed in each positioning portion of the tray. When the tray moves into the main assembly 170, the plurality of processing cartridges 100 move into the main assembly 170 together with the tray. When the processing cartridges need to be replaced, the plurality of processing cartridges can move out of the main assembly 170 together with the tray.

[0089] The processing cartridge has a developing coupling (developing driving force receiving portion) and a drum coupling (photosensitive member coupling member). When the door 11 of the main assembly 170 is closed, the main assembly side drum drive transmission unit 203 and the developing drive transmission unit for transmitting the driving force to the processing cartridge are engaged to transmit the drive to the processing cartridge.

[0090] When the door 11 is opened, the drum drive transmission unit 203 and the developing drive transmission unit retract and disengage from the drum coupling and the developing coupling of the processing cartridge 100, and then the tray 171 and the processing cartridge 100 can be smoothly taken out from the main assembly 170.

[0091] As Figure 2 、 Figure 4 、 Figure 12As shown, the drum drive transmission unit 203 provided on the main component 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. One end of the driving force transmission member 180 is provided with a rotation stop portion 180b for receiving a driving force, and the other end is provided with a driving force transmission portion 180d. The driving force transmission portion 180d is a convex portion distributed along the circumferential direction on the inner wall of the driving force transmission member 180. The surface on one side in the circumferential direction of the driving force transmission portion 180d is a driving transmission surface 180d1, and the surface on the other side in the circumferential direction of the driving force transmission portion 180d opposite to the driving transmission surface 180d1 is an abutting surface 180d2. The driving force transmission member 180 is further provided with a reinforcing cylindrical portion 180e to enhance the stiffness of the driving force transmission portion 180d. A positioning boss 180i is also provided at the central axis position of the driving force transmission member 180.

[0092] The driving force transmission member 180 is assembled on the rotating member 201 in a manner movable 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 drives the rotation of the driving force transmission member 180. The driving force transmission member 180 can extend in the direction of the processing cartridge along the axial direction M1 to engage with the drum coupling of the processing cartridge. The direction close to the processing cartridge in the axial direction M1 is also referred to as the extending direction M1B; the driving force transmission member 180 can retract in the direction away from the processing cartridge along the axial direction M1 to disengage from the drum coupling of the processing cartridge. The direction away from the processing cartridge in the axial direction M1 is also referred to as the retracting direction M1A.

[0093] As Figures 2 to 5 shown, 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.

[0094] The first braking force engaging member 204 and the second braking force engaging member 208 are used to apply a braking force to the processing cartridge 100. The two can be assembled together by engaging a rotation stop protrusion 208c and a rotation stop recess 204c, and they can have a synchronous operation process. The second braking force engaging member 208 is located inside the first braking force engaging member 204, and the engaging portion 204b of the first braking force engaging member 204 can be in contact with or abutted against the driving force transmission portion 180d.

[0095] The shaft portion 207b of the braking transmission member 207 passes through the through holes in the middle of the first braking force engaging member 204 and the second braking force engaging 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 engaging member 204 and the second braking force engaging member 208.

[0096] 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 engaging member 204. When the protrusion 207e of the braking transmission member 207 engages with the protrusion 204e of the first braking force engaging member 204, the braking transmission member 207 can transmit the braking force to the first braking force engaging member 204.

[0097] The first braking force engaging member 204 and the second braking force engaging member 208 can move axially on the M1 relative to the braking transmission member 207 and the braking member 206. When the protrusion 207e of the braking transmission member 207 is offset or separated from the protrusion 204e of the first braking force engaging member 204 axially on the M1, the second braking force engaging member 208 and the first braking force engaging member 204 will not receive the braking force.

[0098] Continuing, referring to Figure 4 and Figure 5 One end of the first engaging 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 engaging member 204. The first engaging spring 211 is in a compressed state, and it applies an elastic force to the first braking force engaging 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 engaging member 204.

[0099] 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.

[0100] Among the components of the above-mentioned drum drive 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 brake 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 direction of arrow M1B is regulated (restricted) by the axial direction restricting portion 212, so that the driving force transmission member 180 does not fall off the drum drive transmission unit 203 from the main assembly 170 side.

[0101] Among the components of the above-mentioned drum drive transmission unit 203, the driving force transmission member 180 is movable relative to the rotating member 201 in the M1A direction (retracting direction) and the M1B direction (extending direction). The first braking force engaging member 204 and the second braking force engaging member 208 are movable relative to the brake transmission member 207 and the rotating member 201 in the M1A direction (retracting direction) and the M1B direction (extending direction), and are also movable relative to the driving force transmission member 180 in the M1A and M1B directions.

[0102] As Figures 2 to 5 shown, in the prior art, when the driving force transmission member 180 rotates and the processing cartridge is not engaged with the driving force transmission member 180, that is, when the driving force transmission member 180 idles, the protrusion on the M1A direction side of the driving force transmission member 180 presses the protrusion on the M1B direction side of the brake transmission member 207. The protrusions of both are inclined surfaces, so that the brake transmission member 207 moves / retracts toward the inside of the driving force transmission member 180 (moves in the M1A direction), and the brake transmission member 207 drives the first braking force engaging member 204 and the second braking force engaging member 208 to also move toward the inside of the driving force transmission member 180. When the protrusion of the driving force transmission member 180 passes the protrusion of the brake transmission member 207 after rotation, the brake transmission member 207, the first braking force engaging member 204, and the second braking force engaging member 208 rebound (move in the M1B direction) under the action of the first engagement spring 211 and the second spring 210 and generate abnormal noises; when the driving force transmission member 180 rotates until the driving transmission surface 180d1 on the driving force transmission portion 180d contacts the first braking force engaging member 204, the first braking force engaging member 204 is driven to rotate, while the brake transmission member 207 does not rotate. When the protrusion 204e on the first braking force engaging member 204 contacts the protrusion 207e of the brake transmission member 207, the first braking force engaging member 204 moves in the direction toward the inside of the driving force transmission member 180. When the protrusion 204e of the first braking force engaging member 204 passes the protrusion 207e of the brake transmission member 207, the first braking force engaging member 204 rebounds and generates abnormal noises.

[0103] As Figure 6 shown, in the prior art, the drum coupling 143 on the drum unit of the processing cartridge 100 is provided at one end of the photosensitive drum 104. The drum coupling 143 is provided with a protrusion that protrudes outward in the axial direction from the surface of the end portion of the shaft portion 143j. The protrusion has a driving force receiving portion 143b as a first side surface (first side portion) for receiving a driving force from the drive transmission unit 203. In addition, the protrusion of the drum coupling 143 includes a braking force receiving portion 143c as a second side surface (second side portion) for receiving a braking force from the drive transmission unit 203. The driving force receiving portion 143b is a side surface (side portion) facing the upstream side in the rotation direction A of the drum unit. In addition, the braking force receiving portion 143c is a side surface (side portion) facing the downstream side in the rotation direction A. The braking force receiving portion 143c is a surface inclined with respect to the axial direction M1, and along the M1A direction (retracting direction), the braking force receiving portion 143c gradually inclines toward the downstream side in the rotation direction A. When the driving force transmission member 180 is engaged with the drum coupling 143 in place, the first braking force engaging member 204 and the second braking force engaging member 208 are engaged with the braking force receiving portion 143c. Thereafter, the abnormal noise when the driving force transmission member 180 rotates disappears.

[0104] Embodiment 1

[0105] As Figure 7 and Figure 8 shown, this embodiment provides a processing cartridge 300 detachably mounted on a main assembly of an electrophotographic apparatus M, including a developing unit 310, a drum unit 320, a drive assembly, and a braking member 350.

[0106] The developing unit 310 includes a developing frame 311, a developing roller, a powder feeding roller, and a blade. The drum unit 320 includes a drum frame 321, a photosensitive drum 324, and a charging roller. The drive assembly includes a developing coupling 330, a drum coupling 340, a developing roller gear, and a powder feeding roller gear.

[0107] As shown in FIG. 7 and Figure 8 shown, the developing frame 311 encloses a powder bin for storing toner. The developing frame 311 is generally in the shape of a long strip box. The developing frame 311 is provided with a drive side bearing and a conductive side bearing at both ends in the length direction. The powder feeding roller and the developing roller are rotatably supported on the drive side bearing and the conductive side bearing at both ends in the length direction of the developing frame 311. The powder feeding roller and the developing roller can rotate under the action of the drive assembly. The axial directions of the powder feeding roller and the developing roller are both along the length direction of the developing frame 311. The powder feeding roller conveys the toner to the developing roller and the charged developing roller adsorbs it.

[0108] As Figure 7 and Figure 8As shown, the drum frame 321 also has a length direction, which is consistent with the length direction of the developing frame 311. The drum frame 321 includes a driving-side end cap 322 and a conductive-side end cap 323 respectively provided at both ends in its length direction. The photosensitive drum 324 is rotatably supported at both ends in the length direction of the drum frame 321, specifically supported on the driving-side end cap 322 and the conductive-side end cap 323. Driving bearings 325 and conductive bearings 326 are respectively provided at both axial ends of the photosensitive drum 324. The photosensitive drum 324 is supported on the through holes of the driving-side end cap 322 and the conductive-side end cap 323 through the driving bearings 325 and the conductive bearings 326 respectively. The photosensitive drum 324 is provided on the lower end side of the drum frame 321 in the height direction. The developing unit 310 and the drum unit 320 are coupled to each other through the driving-side end cap 322 and the conductive-side end cap 323. The developing roller and the photosensitive drum 324 are close to each other. The toner adsorbed by the developing roller transfers the toner to the photosensitive drum 324 through the potential difference between the photosensitive drum 324. The charging roller is used to charge the surface of the photosensitive drum 324 with uniform charges, so that the photosensitive drum 324 can adsorb toner.

[0109] As Figure 7 shown, the developing coupling 330, the developing roller gear, the powder feeding roller gear, and the agitating frame gear are provided outside the driving-side bearing. Specifically, a support hole for supporting the developing coupling 330 is provided on the driving-side bearing. The developing coupling 330 is used to engage with the developing drive transmission unit of the electrophotographic device 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, and 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. The developing roller gear and the powder feeding roller gear are directly or indirectly engaged with the developing coupling 330 to transmit the driving force received by the developing coupling 330, so as to drive the developing roller and the powder feeding roller to rotate.

[0110] As Figures 7 to 11 shown, the drum coupling 340 is provided at the end of the photosensitive drum 324 in the length direction (axial direction). The drum coupling 340 is used to receive the driving force of the electrophotographic device (transmitted by engaging with the driving force transmission member 180) to drive the photosensitive drum 324 to rotate. The axial direction of the drum coupling 340 is consistent with the axial direction M1 of the driving force transmission member 180. The drum coupling 340 includes a mounting portion 341, a driving force receiving portion 342, a pressing portion 343, and a restricting portion.

[0111] As Figure 10 and Figure 13As shown, the mounting portion 341 is provided on the side of the drum coupling 340 facing the photosensitive drum 324 (i.e., the side in the direction of M1B). The mounting portion 341 is used to connect with the photosensitive drum 324 (specifically, to connect with the drive bearing 325 at the drive end of the photosensitive drum 324), so as to fix the drum coupling 340 at one end of the photosensitive drum 324. During assembly, the mounting portion 341 is inserted into the drive bearing 325 of the photosensitive drum 324 and can be fixed by means such as clamping, pasting, and gluing. Further, a protrusion is provided on the mounting portion 341 to play a role in clamping and positioning with the drive bearing 325 of the photosensitive drum 324.

[0112] As Figure 11 shown, the driving force receiving portion 342 is provided on the end face of the drum coupling 340 on the side facing away from the photosensitive drum 324 (i.e., the end face on the side in the direction of M1A). The driving force receiving portion 342 is a first protrusion protruding from the end face of the drum coupling 340. The driving force receiving portion 342 is used to receive the driving force applied by the driving force transmission portion 180d. The number of the driving force receiving portions 342 is two, and they are symmetrically arranged on the end face of the coupling. When the drum coupling 340 is engaged with the driving force transmission member 180, one side surface (the side surface on the upstream side in the rotational direction A) of the driving force receiving portion 342 is the driving force receiving surface 342a, and the driving force receiving surface 342a abuts against the driving transmission surface 180d1 of the driving force transmission portion 180d to receive the driving force. The other side surface of the driving force receiving portion 342 is the braking force receiving surface 342b. The braking force receiving surface 342b is arranged opposite to the driving force receiving surface 342a. The braking force receiving surface 342b is the surface of the driving force receiving portion 342 on the downstream side in the rotational direction A. The braking force receiving surface 342b is a surface inclined with respect to the axis M1. Along the M1A direction (retracting direction), the braking force receiving surface 342b gradually inclines toward the upstream side in the rotational direction A, that is, the inclination direction of the braking force receiving surface 342b is opposite to the inclination direction of the braking force receiving portion 143c in the prior art. Therefore, the braking force receiving surface 342b in this embodiment cannot be engaged with the first braking force engaging member 204 / second braking force engaging member 208, and the problem of abnormal noise generated when the driving force transmission member 180 rotates cannot be solved by the engagement of the two.

[0113] Based on this, this embodiment proposes another solution to solve the above abnormal noise problem. As Figure 11As shown, the drum coupling 340 of this embodiment further includes an extrusion portion 343. The extrusion portion 343 is provided on the end face of the drum coupling 340 on the side facing away from the photosensitive drum 324 (the end face on the M1A direction side). The extrusion portion 343 is a second protrusion protruding from the end face of the drum coupling 340. The extrusion portion 343 is connected to the driving force receiving portion 342 and is located on the downstream side of the driving force receiving portion 342 in the rotation direction A, that is, the extrusion portion 343 is connected to the side of the driving force receiving portion 342 where the braking force receiving surface 342b is provided. The extrusion portion 343 acts on the braking force application assembly to reduce or eliminate abnormal noises when the driving force transmission member rotates. The number of the second protrusions is two, and the two extrusion portions 343 have a certain interval in the circumferential direction (rotation direction A), and the two extrusion portions 343 are symmetrically arranged about the center. The extrusion portion 343 protrudes from the end face by a certain height in the axial direction, but the height of the extrusion portion 343 protruding from the end face is lower than the height of the driving force receiving portion 342 protruding from the end face. When the driving force transmission member 180 moves in the direction approaching the processing cartridge 300 (in the M1B direction / extending direction), the second braking force engaging member 208 abuts against the extrusion portion 343 and is pressed by the extrusion portion 343 during the relative movement. The second braking force engaging member 208 moves / retracts into the driving force transmission member 180 (moves in the M1A direction). At this time, the first braking force engaging member 204 is integrally pressed to move / retract into the driving force transmission member 180. Then, the braking force transmission member 207 moves toward the inside of the driving force transmission member 180 in the direction away from the processing cartridge 300 under the action of the second braking force engaging member 208, so that the protrusion 204e on the first braking force engaging member 204 is displaced from the protrusion 207e on the braking force transmission member 207, thereby reducing or eliminating abnormal noises. In addition, when the height of the extrusion portion 343 protruding from the end face is sufficient, the distances that the first braking force engaging member 204 and the second braking force engaging member 208 move in the M1A direction (retracting direction) can be larger. At this time, the second braking force engaging member 208 can also drive the braking force transmission member 207 to move into the driving force transmission member 180 (move in the M1A direction), thereby reducing or eliminating abnormal noises generated between the braking force transmission member 207 and the driving force transmission member 180.

[0114] In some other embodiments, the number of the extrusion portions 343 can be set to be more or less, such as one, three, four, etc.

[0115] Such as Figure 11 As shown, the limiting portion is used to limit or prevent relative inclination when the drum drive transmission unit is engaged with the drum coupling 340. The limiting portion includes a first limiting portion 344a, a second limiting portion 344b, and a third limiting portion 344c.

[0116] Such as Figures 11 to 13As shown, the first limiting portion 344a is a first annular protrusion provided on the circumferential periphery of the drum coupling 340. The first annular protrusion protrudes in the M1A direction (retraction direction). The inner diameter of the first annular protrusion can be adapted to the size of the driving force transmission member 180 of the electrophotographic apparatus. When the driving force transmission member 180 extends in the M1B direction and engages with the drum coupling 340, the cylindrical portion 180e of the driving force transmission member 180 extends into the first annular protrusion and fits with the first annular protrusion, that is, the first annular protrusion sleeves a part of the driving force transmission member 180, which can limit the driving force transmission member 180 and prevent the driving force transmission member 180 from tilting with the drum coupling 340, causing poor printing. Further, a guiding surface is provided at one end of the first annular protrusion away from the photosensitive drum 324. The guiding surface is an inclined surface, which can play a guiding role when the driving force transmission member 180 engages with the drum coupling 340, making the engagement between the two smoother and shortening the engagement time.

[0117] As Figures 11 to 13 shown, the second limiting portion 344b is a second annular protrusion provided at the central axis position of the drum coupling 340. The second annular protrusion protrudes from the end surface of the drum coupling 340 in the M1A direction. The second annular protrusion is located at the central axis position of the drum coupling 340. The inner diameter of the second annular protrusion is adapted to the positioning boss 180i of the driving force transmission member 180. When the driving force transmission member 180 extends in the M1B direction and engages with the drum coupling 340, a part of the positioning boss 180i extends into the second annular protrusion and fits with the second annular protrusion, which can limit the driving force transmission member 180. The driving force receiving portion 342 and the pressing portion 343 are distributed on the periphery of the second limiting portion 344b.

[0118] As Figure 11As shown, the third restricting portion 344c is a contact projection protruding from the end face of the drum coupling 340. The number of the third restricting portions 344c is two, and the two third restricting portions 344c are symmetrically arranged about the center on the end face of the drum coupling 340. The third restricting portion 344c is located on the periphery of the second restricting portion 344b. In the circumferential direction of the drum coupling 340, the driving force receiving portion 342, the third restricting portion 344c, and the pressing portion 343 are arranged in sequence. There is a certain interval between the driving force receiving portion 342 and the third restricting portion 344c (contact projection) in the circumferential direction, and this interval is adapted to the circumferential width of the driving force transmission portion 180d of the driving force transmission member 180. The surface of the third restricting portion 344c facing the driving force receiving portion 342 is a contact surface. When the driving force transmission member 180 extends in the M1B direction and engages with the drum coupling 340, all or part of the driving force transmission portion 180d is inserted into the interval between the third restricting portion 344c and the driving force receiving portion 342, and the driving transmission surface 180d1 of the driving force transmission portion 180d abuts against the side surface (i.e., the driving force receiving surface 342a) of the driving force receiving portion 342 facing the third restricting portion 344c to receive the driving force, and the contact surface 180d2 of the driving force transmission portion 180d abuts against the contact surface of the third restricting portion 344c, so that the driving force transmission member 180 is restricted by the third restricting portion 344c to prevent the two from tilting.

[0119] In this embodiment, the drum coupling 340 is provided with a plurality of restricting portions to restrict the driving force transmission member 180, prevent the drum coupling 340 from tilting / skewing when engaging with the driving force transmission member 180, ensure stable contact between the drum coupling 340 and the driving force transmission member 180, and avoid poor printing.

[0120] Due to the inclination direction of the braking force receiving surface 342b of the drum coupling 340 and the action of the pressing portion 343 in this embodiment, it cannot be engaged with the first braking force engaging member 204 and the second braking force engaging member 208, and cannot receive sufficient braking force from the electrophotographic apparatus side. Therefore, it is necessary to add a braking member 350 to the processing cartridge 300 to provide a braking force for the photosensitive drum 324 to ensure stable rotation of the photosensitive drum 324.

[0121] As Figure 14 and Figure 15As shown in the figure, in this embodiment, the braking member 350 is disposed at the conductive end of the processing cartridge 300. Specifically, the braking member 350 acts on the conductive bearing 326 to generate a braking force on the photosensitive drum 324. The conductive bearing 326 has a hollow interior, and a plurality of ribs 3261 are provided on the circumferential inner wall of the conductive bearing 326. The processing cartridge 300 further includes a conductive pin 327. The conductive pin 327 is partially inserted into the conductive bearing 326 after passing through the through hole in the conductive side cover 323. The braking member 350 is a torsion spring. The coil portion of the torsion spring is sleeved on the conductive pin 327 and tightly holds the conductive pin 327, and is inserted into the conductive bearing 326 together with the conductive pin 327. The arm portion of the torsion spring abuts against the rib 3261 of the conductive bearing 326 or the gap between two adjacent ribs 3261. The torsion force of the torsion spring acts on the conductive bearing 326, and then acts on the photosensitive drum 324, thereby generating a braking force on the photosensitive drum 324 and enabling the photosensitive drum 324 to rotate stably.

[0122] In this embodiment, the braking member 350 that provides a braking force is disposed on the processing cartridge 300, which can ensure that the photosensitive drum 324 does not rotate when the electrophotographic apparatus is just started, and is more easily and quickly and stably engaged with the drum drive transmission unit and rotates stably. In addition, the drum coupling 340 is provided with an extrusion portion 343 that acts on the braking force application assembly, reducing or eliminating the problem of abnormal noise when the driving force transmission member 180 rotates.

[0123] Embodiment Two

[0124] This embodiment provides a processing cartridge 300. Compared with Embodiment One, the difference lies in the different structure of the drum coupling 340.

[0125] As Figure 16 shown in the figure, in this embodiment, the drum coupling 340 includes a mounting portion, a driving force receiving portion 342, an extrusion portion 343, and a restricting portion, wherein the structures of the mounting portion, the driving force receiving portion 342, and the extrusion portion 343 are the same as those in Embodiment One.

[0126] As Figure 16As shown, the limiting part includes a first limiting part 344a and a third limiting part 344c, and the second limiting part 344b is omitted, that is, the second annular convex located at the central axis position of the drum coupling 340 is omitted. A concave part is formed at the central axis position of the drum coupling 340. The positioning boss 180i of the driving force transmission member 180 can be inserted into the concave part, but the concave part has no limiting effect on the positioning boss 180i. The structures of the first limiting part 344a and the third limiting part 344c are the same as those in the first embodiment. That is, when the driving force transmission member 180 extends along the M1B direction and engages with the drum coupling 340, the cylindrical part 180e of the driving force transmission member 180 extends into the first annular convex and fits with the first annular convex. The driving force transmission part 180d is inserted into the gap between the third limiting part 344c and the driving force receiving part 342, and the driving transmission surface 180d1 of the driving force transmission part 180d abuts against the side surface (driving force receiving surface 342a) of the driving force receiving part 342 facing the third limiting part 344c to receive the driving force. The abutting surface 180d2 of the driving force transmission part 180d abuts against the abutting surface of the third limiting part 344c. The driving force transmission member 180 is jointly limited by the first limiting part 344a and the third limiting part 344c to prevent the two from tilting / skewing and ensure stable contact.

[0127] The other structures of the processing cartridge 300 in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0128] Embodiment III

[0129] This embodiment provides a processing cartridge 300. Compared with the first embodiment and the second embodiment, the difference lies in that the structure of the drum coupling 340 is different.

[0130] As Figure 17 shown, in this embodiment, the structures of the mounting part, the driving force receiving part 342, and the pressing part 343 of the drum coupling 340 are the same as those in the first embodiment, and the structure of the limiting part is different.

[0131] As Figure 17 shown, in this embodiment, the limiting part includes a first limiting part 344a and a second limiting part 344b, and the third limiting part 344c is omitted. The structures of the first limiting part 344a and the second limiting part 344b are the same as those in the first embodiment. When the driving force transmission member 180 extends along the M1B direction and engages with the drum coupling 340, the cylindrical part 180e of the driving force transmission member 180 extends into the first annular convex (first limiting part 344a) and fits with the first annular convex, that is, the first annular convex sleeves a part of the driving force transmission member 180. A part of the positioning boss 180i extends into the second annular convex (second limiting part 344b) and fits with the second annular convex. The driving force transmission member 180 is jointly limited by the first limiting part 344a and the second limiting part 344b to prevent the two from tilting / skewing and ensure stable contact.

[0132] The other structures of the processing cartridge 300 in this embodiment are the same as those in the first embodiment, and will not be described herein again.

[0133] Embodiment Four

[0134] This embodiment provides a processing cartridge 300. Compared with the first to third embodiments, the difference lies in the different structure of the drum coupling 340.

[0135] As Figure 18 shown, in this embodiment, the structures of the mounting portion, the driving force receiving portion 342, and the pressing portion 343 of the drum coupling 340 are the same as those in the first embodiment, but the structure of the restricting portion is different.

[0136] As Figure 18 shown, in this embodiment, the restricting portion only includes a first restricting portion 344a (first annular protrusion), and the second restricting portion 344b and the third restricting portion 344c are omitted. When the driving force transmission member 180 extends in the M1B direction and engages with the drum coupling 340, the cylindrical portion 180e of the driving force transmission member 180 extends into the first annular protrusion and fits with the first annular protrusion, that is, the first annular protrusion sleeves a part of the driving force transmission member 180, which can restrict the driving force transmission member 180 and prevent the driving force transmission member 180 from tilting with the drum coupling 340, causing poor printing.

[0137] The other structures of the processing cartridge 300 in this embodiment are the same as those in the first embodiment, and will not be described herein again.

[0138] Embodiment Five

[0139] This embodiment provides a processing cartridge 300. Compared with the first embodiment, the difference lies in the different structure of the braking member 350.

[0140] As Figure 19 and Figure 20 shown, in this embodiment, the braking member 350 is a torsion spring. The coil portion of the torsion spring is sleeved on the circumferential outer wall of the cylindrical portion of the conductive bearing 326 and holds the conductive bearing 326 tightly. The arm portion of the torsion spring abuts against the conductive side end cover 323. The torsion spring is installed on the conductive bearing 326 with an interference fit, and the arm portion of the torsion spring is snap-fitted and fixed on the conductive side end cover 323. When the photosensitive drum 324 rotates (the conductive bearing 326 rotates synchronously), the torsion spring does not rotate. The torsion force of the torsion spring acts on the conductive bearing 326, and then acts on the photosensitive drum 324, thereby generating a braking force on the photosensitive drum 324 to make the photosensitive drum 324 rotate stably.

[0141] The other structures of the processing cartridge 300 in this embodiment are the same as those in the first embodiment, and will not be described herein again.

[0142] Embodiment Six

[0143] This embodiment provides a processing cartridge 300. Compared with Embodiment 1 and Embodiment 5, the difference lies in the different structure of the braking member 350.

[0144] As Figure 21 and Figure 22 shown, in this embodiment, the braking member 350 is an annular member. The braking member 350 is fixedly arranged on the end face (the end face along the M1B direction) of the conductive bearing 326 facing the conductive side cover 323. The braking member 350 can be a rubber ring / rubber band that can be extruded and deformed. The braking member 350 is located between the conductive bearing 326 and the conductive side cover 323. The braking member 350 is extruded and deformed, so as to generate a frictional force between the conductive side cover 323 and the conductive bearing 326. This frictional force provides a braking force acting on the photosensitive drum 324, so that the photosensitive drum 324 rotates stably.

[0145] The other structures of the processing cartridge 300 in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0146] Embodiment 7

[0147] This embodiment provides a processing cartridge 300. Compared with Embodiment 1, the difference lies in the different structure of the drum coupling 340 and the different structure of the braking member 350.

[0148] As Figure 23 and Figure 24 shown, in this embodiment, the drum coupling 340 includes a cylindrical portion 345 and a drum connection portion 346. The cylindrical portion 345 and the drum connection portion 346 are arranged in sequence along the M1B direction. The driving end of the photosensitive drum 324 is not provided with a driving bearing 325. The drum coupling 340 is directly inserted into one end of the photosensitive drum 324 through the drum connection portion 346 and is engaged with the photosensitive drum 324. On the end face of the cylindrical portion 345 facing the M1A direction, a driving force receiving portion 342 and an extrusion portion 343 are provided. The structures of the driving force receiving portion 342 (the first protrusion) and the extrusion portion 343 (the second protrusion) in this embodiment are the same as those in Embodiment 1.

[0149] As Figure 23 and Figure 24 shown, the limiting portion in this embodiment only includes a second limiting portion 344b (the second annular protrusion), and the first limiting portion 344a and the third limiting portion 344c are omitted.

[0150] As Figure 23 and Figure 24As shown in the figure, in this embodiment, the braking member 350 is a torsion spring. The coil part of the torsion spring is sleeved on the cylindrical part 345 of the drum coupling 340 and tightly holds the cylindrical part 345. The torsion spring is installed on the drum coupling 340 with an interference fit. The arm part of the torsion spring is clamped and fixed / abutted against the driving side end cover 322. When the drum coupling 340 drives the photosensitive drum 324 to rotate, the torsion spring does not rotate along with it. The torsion force of the torsion spring acts on the drum coupling 340, and then acts on the photosensitive drum 324, thereby generating a braking force on the photosensitive drum 324 to make the photosensitive drum 324 rotate stably.

[0151] The other structures of the processing cartridge 300 in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0152] Embodiment 8

[0153] This embodiment provides a processing cartridge 300. Compared with Embodiment 7, the difference lies in the different structure of the braking member 350.

[0154] As Figures 25 to 28 shown, in this embodiment, the braking member 350 is a rubber ring or rubber band. A ring-shaped groove 3451 is provided on the circumferential surface of the cylindrical part 345 of the drum coupling 340. The braking member 350 is installed in the ring-shaped groove 3451 and a part of the braking member 350 protrudes from the circumferential outer wall of the cylindrical part 345. When the drum coupling 340 is supported in the through hole of the driving side end cover 322, the part of the braking member 350 protruding from the circumferential surface of the cylindrical part 345 contacts and is squeezed by the driving side end cover 322, thereby generating a frictional force between the driving side end cover 322 and the drum coupling 340. This frictional force provides the braking force acting on the photosensitive drum 324 to make the photosensitive drum 324 rotate stably.

[0155] Furthermore, as Figures 25 to 28 shown, the braking member 350 can be arranged at the conductive end. Specifically, a ring-shaped groove 3262 is provided on the circumferential outer wall of the cylindrical part of the conductive bearing 326 at the conductive end of the photosensitive drum 324. The braking member 350 is a rubber ring or rubber band, which is sleeved in the ring-shaped groove 3262 of the conductive bearing 326 and contacts and is squeezed by the conductive side end cover 323. The frictional force between the two provides the braking force acting on the photosensitive drum 324.

[0156] The other structures of the processing cartridge 300 in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0157] Embodiment 9

[0158] This embodiment provides a processing cartridge 300. Compared with Embodiments 1 to 8, the difference lies in the different structure of the drum coupling 340.

[0159] As Figures 29 to 31As shown, in this embodiment, the drum coupling 340 includes a cylindrical portion 345 and a drum connection portion 346. On the end face of the cylindrical portion 345 facing the M1A direction, there are a third ring convex 347, a pressing portion 343 and a limiting portion. The third ring convex 347 protrudes along the M1A direction (retracting direction). The diameter of the third ring convex 347 is smaller than that of the cylindrical portion 345, that is, there is a certain distance between the outer circumferential surface of the third ring convex 347 and the outer circumferential surface of the cylindrical portion 345. There are two centrally symmetric notch portions 3471 on the third ring convex 347. The driving force transmission portion 180d of the driving force transmission member 180 can be inserted into the notch portions 3471. One side of the notch portion 3471 in the circumferential direction is a driving force receiving surface 342a. When the driving force transmission member 180 is engaged with the drum coupling 340, the driving force receiving surface 342a abuts against the driving transmission surface 180d1. The third ring convex 347 of this embodiment has a smaller radial thickness. Compared with the previous embodiment, the area of the driving force receiving surface 342a becomes smaller. The thickness of the third ring convex 347 is adapted to the gap 209 between the first braking force engaging member 204 and the second braking force engaging member 208, that is, when the driving force transmission member 180 moves along the M1B direction (extending direction), the third ring convex 347 is inserted from the gap 209 between the first braking force engaging member 204 and the second braking force engaging member 208, and the position of the notch portion 3471 corresponds to the position of the driving force transmission portion 180d for the driving force transmission portion 180d to be inserted, and the driving force receiving surface 342a abuts against the driving transmission surface 180d1.

[0160] Further, as Figure 29 and Figure 30 shown, the pressing portion 343 is a frustum structure formed at the central axis position of the cylindrical portion 345. The frustum structure protrudes from the end face of the cylindrical portion 345. The pressing portion 343 is located inside the third ring convex 347 and has a distance from the third ring convex 347. The height of the frustum structure protruding from the end face of the cylindrical portion 345 is lower than the height of the third ring convex 347. When the driving force transmission member 180 moves in the direction close to the processing cartridge 300 (along the M1B direction), the second braking force engaging member 208 abuts against the end face of the frustum structure (pressing portion 343) and is pressed by the frustum structure during the relative movement. The second braking force engaging member 208 moves inside the driving force transmission member 180 (moves along the M1A direction). At this time, the first braking force engaging member 204 is integrally pressed to move inside the driving force transmission member 180. Then, the braking transmission member 207 also moves inside the driving force transmission member 180 in the direction away from the processing cartridge 300 under the action of the second braking force engaging member 208. At this time, the braking transmission member 207, the first braking force engaging member 204 and the second braking force engaging member 208 are disengaged from the braking working position, thereby reducing or eliminating the abnormal noise generated when the driving force transmission member 180 rotates.

[0161] In this embodiment, the limiting part only includes the second limiting part 344b, that is, the second annular convex provided at the axial position of the cylindrical part 345. The second annular convex is located inside the frustum structure (the extrusion part 343), and the height of the second limiting part 344b is higher than that of the extrusion part 343.

[0162] The other structures of the processing cartridge 300 in this embodiment are the same as those in the first embodiment, and will not be described in detail here.

[0163] Embodiment Ten

[0164] This embodiment provides a processing cartridge 300. Compared with the ninth embodiment, the difference lies in the structure of the drum coupling 340.

[0165] As Figure 32 shown, in this embodiment, the drum coupling 340 includes a cylindrical part 345 and a drum connection part 346. On the end face of the cylindrical part 345 facing the M1A direction, there are a third annular convex 347, an extrusion part 343, a limiting part, and a driving force receiving part 342.

[0166] As Figure 32 shown, the structures of the third annular convex 347, the extrusion part 343, and the limiting part are the same as those in the ninth embodiment. The driving force receiving part 342 is a convex structure, including two convexes, which are symmetrically arranged on the inner wall of the third annular convex 347 respectively. The position of each convex corresponds to the position of a notch part 3471 on the third annular convex 347. The end face of the convex facing the M1A direction (retracting direction) is the driving force receiving face 342a, and the driving force receiving face 342a is an inclined plane inclined relative to the end face of the cylindrical part 345. The driving force receiving face 342a is flush with the surface of the notch part 3471 facing the M1A direction.

[0167] As Figure 31 and Figure 32 shown, the driving force transmission part 180d is also provided with a transmission inclined plane 180d3, and one end of the transmission inclined plane 180d3 is connected to the driving transmission face 180d1. When the driving force transmission member 180 extends along the M1B direction and engages with the drum coupling 340, the extrusion part 343 pushes the braking force application member to move in the M1A direction to reduce or eliminate the abnormal noise generated when the driving force transmission member 180 rotates. The third annular convex 347 is inserted into the gap 209 between the first braking force engagement member 204 and the second braking force engagement member 208. The braking driving force transmission part 180d is at least partially inserted into the notch part 3471 of the third annular convex 347, and the transmission inclined plane 180d3 abuts against the driving force receiving face 342a of the driving force receiving part 342 to receive the driving force.

[0168] The other structures of the processing cartridge 300 in this embodiment are the same as those in the first embodiment, and will not be described in detail here.

[0169] Example XI

[0170] This embodiment provides a processing cartridge. Different from the foregoing embodiments, it lies in the structure of the drum coupling 340.

[0171] As Figure 33 and Figure 34 shown, in this embodiment, the drum coupling 340 includes a mounting portion 341, a driving force receiving portion 342, a pressing portion 343, and a restricting portion. The structure of the mounting portion 341 is the same as that in Embodiment 1. The restricting portion includes a first restricting portion 344a and a second restricting portion 344b, and the structures of the first restricting portion 344a and the second restricting portion 344b are the same as those in Embodiment 1.

[0172] As Figure 33 and Figure 34 shown, the driving force receiving portion 342 is a first protrusion protruding from the end face of the drum coupling 340. One side surface of the driving force receiving portion 342 is a driving force receiving surface 342a, and the driving force receiving surface abuts against the driving transmission surface 180d1 of the driving force transmission portion 180d to receive the driving force. The other side surface of the driving force receiving portion 342 is a braking force receiving surface 342b. The braking force receiving surface 342b is arranged opposite to the driving force receiving surface 342a. The braking force receiving surface 342b is a surface inclined with respect to the axial direction M1. Along the M1A direction, the braking force receiving surface 342b gradually inclines toward the upstream side in the rotation direction A, that is, the inclination direction of the braking force receiving surface 342b is opposite to the inclination direction of the braking force receiving portion 143c in the prior art.

[0173] The pressing portion 343 is a second protrusion protruding from the end face of the drum coupling 340. The pressing portion 343 is connected to the driving force receiving portion 342 and is located on the downstream side of the driving force receiving portion 342 in the rotation direction A, that is, the pressing portion 343 is connected to the side of the driving force receiving portion 342 where the braking force receiving surface 342b is provided. One end of the braking force receiving surface 342b along the M1B direction (extending direction) is connected to one end of the pressing portion 343 along the M1A direction (retracting direction). The pressing portion 343 acts on the braking force applying assembly to reduce or eliminate abnormal noise when the driving force transmission member rotates.

[0174] As Figure 33 and Figure 34 shown, in this embodiment, the number of both the driving force receiving portion 342 and the pressing portion 343 is two. One driving force receiving portion 342 and one pressing portion 343 form a set of protrusions. The driving force receiving portion 342 and the pressing portion 343 of the same set of protrusions are connected to each other. The two sets of protrusions are arranged in central symmetry, and the two sets of protrusions do not contact each other, that is, in the rotation direction A, there is a certain interval between the upstream side and the downstream side of the two sets of protrusions.

[0175] In this embodiment, a gap may be formed between the outer wall of the second restricting portion 344b and the pressing portion 343 and the driving force receiving portion 342. In another embodiment, the outer wall of the second restricting portion 344b may be in contact with the pressing portion 343 and the driving force receiving portion 342.

[0176] Embodiment Twelve

[0177] As Figure 35 shown, this embodiment provides a processing cartridge. Compared with Embodiment Eleven, the difference lies in that the structure of the restricting portion of the drum coupling 340 is different. In this embodiment, the restricting portion only includes the first restricting portion 344a, and the other structures of the drum coupling 340 are the same as those in Embodiment Eleven, which will not be described in detail here.

[0178] Embodiment Thirteen

[0179] This embodiment provides a processing cartridge. Compared with Embodiment Eleven, the difference lies in that the structure of the driving force receiving portion 342 of the drum coupling 340 is different.

[0180] As Figure 36 and Figure 37 shown, in this embodiment, the driving force receiving portion 342 is a first protrusion protruding from the end face of the drum coupling 340. One side of the driving force receiving portion 342 is a driving force receiving surface 342a, the driving force receiving surface 342a is perpendicular to the end face of the drum coupling 340, the other side of the driving force receiving portion 342 is a braking force receiving surface 342b, the braking force receiving surface 342b is arranged opposite to the driving force receiving surface 342a, the braking force receiving surface 342b is a straight surface, and the braking force receiving surface 342b is also perpendicular to the end face of the drum coupling 340, that is, the braking force receiving surface 342b is parallel to the driving force receiving surface 342a and also parallel to the axis M1 of the drum coupling 340. The braking force receiving surface 342b parallel to the axis M1 cannot be engaged with the first braking force engaging member 204 / the second braking force engaging member 208.

[0181] As Figure 36 and Figure 37 shown, the pressing portion 343 of this embodiment is arranged on the downstream side of the driving force receiving portion 342 in the rotational direction A and is connected to the braking force receiving surface 342b. The pressing portion 343 and the driving force receiving portion 342 of this embodiment are also divided into two groups, and the two groups of pressing portions 343 and driving force receiving portions 342 do not contact each other. The pressing portion 343 acts on the braking force applying assembly to reduce or eliminate abnormal noise when the driving force transmission member rotates.

[0182] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the creative concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A processing cartridge detachably installed in an electrophotographic apparatus, the electrophotographic apparatus including a drum driving transmission unit capable of axially telescopic movement, the direction toward the processing cartridge being the extending direction and the direction away from the processing cartridge being the retracting direction; a braking force applying component and a driving force transmission member are provided in the drum driving transmission unit, characterized in that, The processing box includes: drum frame; a photosensitive drum rotatably supported on the drum frame; a drum coupling, provided at one end of the photosensitive drum, for engaging with the drum drive transmission unit and receiving a driving force to rotate in a rotation direction A; The drum coupling includes an extrusion portion acting on the braking force applying assembly. During the engagement of the drum coupling with the drum drive transmission unit, the drum coupling abuts against the braking force applying assembly to move the braking force applying assembly along the retraction direction, thereby reducing or eliminating abnormal noise when the drive transmission unit rotates.

2. The processing cartridge according to claim 1, wherein The extrusion portion is protruding from the end surface of the drum coupling, and the number of the extrusion portion is at least one.

3. The processing cartridge according to claim 2, wherein The drum coupling includes a driving force receiving portion that is provided to protrude from an end surface of the drum coupling, and a side surface of the driving force receiving portion on the upstream side in the rotation direction A serves as a driving force receiving surface.

4. The processing cartridge according to claim 3, wherein, The pressing portion is located on the downstream side of the driving force receiving portion in the rotation direction A.

5. The processing cartridge according to claim 4, wherein A height at which the pressing portion projects from an end cover of the drum coupling is lower than a height at which the driving force receiving portion projects from an end surface of the drum coupling.

6. The processing cartridge according to claim 5, wherein The driving force receiving portion is a first protrusion, the pressing portion is a second protrusion, and one end of the first protrusion is connected to one end of the second protrusion.

7. The processing cartridge according to claim 2, characterized in that, The extrusion portion is a truncated cone structure.

8. The processing cartridge according to claim 7, wherein A third annular protrusion is provided on the end surface of the drum coupling, and the extrusion portion is located at the inner periphery of the third annular protrusion.

9. The processing cartridge according to claim 8, wherein, There is a distance between the third annular protrusion and the frustum structure, and the height of the frustum structure is lower than the height of the third annular protrusion.

10. The processing cartridge according to claim 9, characterized in that, A notch portion is provided on the third annular protrusion, and a side surface of the notch portion in the circumferential direction is a driving force receiving surface.

11. The processing cartridge according to claim 9, wherein, A notch is provided on the third annular bulge, and a driving force receiving portion is provided on the inner wall of the third annular bulge. The position of the driving force receiving portion corresponds to the position of the notch, and the end face of the driving force receiving portion facing the retraction direction is the driving force receiving surface.

12. The processing cartridge according to claim 6, wherein The side surface of the driving force receiving portion on the downstream side in the rotation direction A serves as a braking force receiving surface.

13. The processing cartridge according to claim 12, wherein, One end of the braking force receiving surface in the extending direction is connected to one end of the pressing portion in the retracting direction.

14. The processing cartridge according to claim 12, wherein The braking force receiving surface is a surface inclined with respect to the axial direction of the drum coupling, and is inclined toward the upstream side in the rotation direction A along the retracting direction.

15. The processing cartridge according to claim 12, wherein The braking force receiving surface is a straight surface parallel to the axial direction of the drum coupling.

16. The processing cartridge according to any one of claims 1 to 15, characterized in that, The process cartridge further includes a braking member for providing a braking force to the photosensitive drum.

17. The processing cartridge according to claim 16, wherein A conductive bearing is provided on the other end of the photosensitive drum opposite to the coupling, and the braking member is provided on the conductive bearing and / or the drum coupling.

18. The processing cartridge according to claim 17, wherein The braking member is a torsion spring.

19. The processing cartridge according to claim 18, wherein The loop of the torsion spring is sleeved on the circumferential outer wall of the conductive bearing and / or drum coupling and tightly holds the conductive bearing and / or drum coupling, and the arm of the torsion spring abuts against the drum frame; when the photosensitive drum rotates, the torsion force of the torsion spring generates a braking force on the photosensitive drum.

20. The processing cartridge according to claim 18, wherein, It further includes a conductive shaft pin which is inserted into the conductive bearing after partially exceeding the through hole on the drum frame. The coil part of the torsion spring is sleeved on the conductive shaft pin and tightly holds the conductive shaft pin. The arm part of the torsion spring abuts against the conductive bearing. When the photosensitive drum rotates, the torque of the torsion spring generates a braking force on the photosensitive drum.

21. The processing cartridge according to claim 20, wherein, Ribs for the arm part of the torsion spring to abut against are provided on the inner wall of the conductive bearing.

22. The processing cartridge according to claim 17, wherein The braking member is arranged between the conductive bearing and the drum frame, and / or, the braking member is arranged between the drum coupling and the drum frame; The braking member can be squeezed and deformed to generate a frictional force between the conductive bearing and the drum frame, and / or, generate a frictional force between the drum coupling and the drum frame; So the frictional force provides the braking force acting on the photosensitive drum.

23. The processing cartridge according to claim 22, wherein, The braking member is arranged on the end face or the circumferential outer wall of the conductive bearing, and / or, the braking member is arranged on the circumferential outer wall of the drum coupling.

24. The processing cartridge according to claim 23, characterized in that, An annular groove for installing the braking member is provided on the circumferential outer wall of the conductive bearing and / or the drum coupling. When the braking member is installed in the annular groove, at least a part of it protrudes from the circumferential outer wall of the conductive bearing and / or the drum coupling.

25. The processing cartridge according to any one of claims 22 to 24, characterized in that, The braking member is a rubber ring or a rubber circle.

26. The processing cartridge according to any one of claims 3 to 15, 17 to 24, characterized in that, The drum coupling includes a limiting part for limiting or preventing relative inclination when the drum drive transmission unit is engaged with the drum coupling.

27. The processing cartridge according to claim 26, wherein The limiting part includes a first ring convex provided on the circumferential periphery of the drum coupling.

28. The processing cartridge according to claim 27, wherein, The first ring convex protrudes in the retracting direction, and the inner diameter of the first ring convex is adapted to the outer diameter of the cylindrical part of the driving force transmission member; when the driving force transmission member extends in the extending direction and is engaged with the drum coupling, the cylindrical part extends into the first ring convex and fits with the first ring convex.

29. The processing cartridge according to claim 26, wherein, The limiting part includes a second ring convex provided at the central axis position of the drum coupling.

30. The processing cartridge according to claim 29, wherein The second ring convex protrudes from the end face of the drum coupling in the retracting direction, and the inner diameter of the second ring convex is adapted to the outer diameter of the positioning boss of the driving force transmission member; when the driving force transmission member extends in the extending direction and is engaged with the drum coupling, a part of the positioning boss extends into the second ring convex and fits with the second ring convex.

31. The processing cartridge according to claim 26, wherein, The limiting part includes an abutting convex provided protruding from the end face of the drum coupling.

32. The processing cartridge according to claim 31, wherein There is a gap between the abutting convex and the driving force receiving part in the circumferential direction, and the gap is adapted to the circumferential width of the driving force transmission part of the driving force transmission member; when the driving force transmission member extends in the extending direction and is engaged with the drum coupling, the driving force transmission part is at least partially inserted into the gap between the abutting convex and the driving force receiving part and abuts against both of them.

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