Processing box

Abstract

The present application relates to a process cartridge detachably mounted in an image forming apparatus provided with a driving force transmission member. The processing box comprises a drum unit, a driving unit and a braking unit, the drum unit comprises a drum frame and a photosensitive drum rotatably supported on the drum frame, and the drum unit is provided with a driving side and a conductive side along the length direction of the drum unit; the driving unit is arranged on the driving side and is used for being jointed with a driving force transmission component of the imaging equipment so as to receive driving force for driving the photosensitive drum to rotate; the braking unit is arranged on the conductive side and provides braking force for the photosensitive drum, and the direction of the braking force is opposite to the direction of the driving force. According to the processing box, the driving unit and the braking unit are arranged on the two sides of the drum unit, so that the drum unit receives the driving force and the braking force from the two sides of the drum unit in the length direction, a structure for receiving the driving force and a structure for receiving the braking force on the processing box are separated, connection between the processing box and the imaging equipment is more reliable, and the connection stability is better; and the driving transmission is smoother.

Description

Technical Field

[0001] The present application relates to the technical field of printing consumables, and in particular to a processing box. Background Art

[0002] The processing box is a consumable material that can be detachably installed on the imaging device. The imaging device is provided with a force transmission unit, and the existing force transmission unit includes a driving force transmission component and a braking force application component, wherein the driving force transmission component is used to transmit the driving force to the processing box, and the braking force application component can apply a load to the photosensitive drum; the corresponding processing box is provided with a driving force receiving part engaged with the driving force transmission component and a braking force receiving part engaged with the braking force application component.

[0003] In the prior art, the force transmission unit is connected to the drum coupling of the processing box through multiple components to transmit driving force and braking force to the processing box. The drum coupling is mostly an integrally formed part, which only relies on its own structure to guide the multiple components of the force transmission unit to engage with their preset positions respectively, that is, the drum coupling is provided with multiple guide surfaces to guide the translation and rotation of different components on the force transmission unit. Therefore, there are problems such as unstable connection between the processing box and the imaging device and unsmooth drive transmission. Summary of the invention

[0004] The present application provides a processing box, which is used to solve the problems of unstable connection between the existing processing box and the force transmission unit of the imaging device and unsmooth drive transmission.

[0005] A process cartridge provided in an embodiment of the present application is detachably mounted in an imaging device provided with a driving force transmission member, the process cartridge comprising:

[0006] a drum unit including a drum frame and a photosensitive drum rotatably supported on the drum frame, wherein the drum unit has a driving side and a conductive side along a length direction of the drum unit;

[0007] a driving unit disposed on the driving side and configured to engage with a driving force transmitting member of the imaging device to receive a driving force for driving the photosensitive drum to rotate;

[0008] A braking unit is provided on the conductive side, and provides a braking force to the photosensitive drum, wherein the direction of the braking force is opposite to the direction of the driving force.

[0009] In a possible design, the driving unit includes:

[0010] a drum coupling connected to the photosensitive drum, the drum coupling having a recessed portion for engaging with a positioning boss of the driving force transmission member;

[0011] A power receiving part is drivingly connected to the drum coupling, and the power receiving part is drivingly connected to the driving force transmission member to receive the driving force of the driving force transmission member and drive the photosensitive drum to rotate.

[0012] In a possible design, the power receiving part includes a transmission member rotatably connected to the drum frame, the transmission member having a cylindrical first transmission part and a second transmission part, the first transmission part abuts against the reinforcement part of the driving force transmission member, and receives the driving force from the driving force transmission member through the friction force between the first transmission part and the reinforcement part, and the second transmission part abuts against the drum coupling, and drives the drum coupling and the photosensitive drum to rotate through the friction force between the first transmission part and the drum coupling.

[0013] In a possible design, the drum coupling includes: a cylindrical portion and a front end portion, the cylindrical portion is connected to the photosensitive drum and abuts against the second transmission portion; the front end portion is connected to the cylindrical portion, and the recess is arranged on the surface of the front end portion facing away from the cylindrical portion.

[0014] In a possible design, the power receiving part further includes: a rolling bearing and a rotating shaft, wherein the rolling bearing is connected to the drum frame; the rotating shaft is rotatably connected to the rolling bearing, and the transmission member is sleeved on the rotating shaft.

[0015] In a possible design, the rotating shaft has cams and / or grooves distributed along its circumference, and the cams are located inside the second transmission part; the transmission member has a flange, and the flange is embedded in the groove.

[0016] In a possible design, a surface of the second transmission portion facing the first transmission portion is provided with concave-convex steps, and the concave-convex steps are used to abut against the reinforcement portion.

[0017] In a possible design, the first transmission part and the second transmission part are coaxially arranged, and the second transmission part is closer to the photosensitive drum than the first transmission part; and the outer diameter of the second transmission part is larger than the outer diameter of the first transmission part.

[0018] In one possible design, the conductive side is provided with a drum bearing connected to the photosensitive drum; the braking unit includes: a roller and a sleeve, and the roller is rotatably connected to the drum frame; the sleeve is sleeved on the outer circumference of the roller and is in interference contact with the drum bearing, and the sleeve provides braking force to the photosensitive drum through the friction between the sleeve and the drum bearing.

[0019] In a possible design, a plurality of the power receiving parts are arranged along the circumference of the photosensitive drum, and / or a plurality of the braking units are arranged along the circumference of the drum bearing.

[0020] In the present application, since the driving unit and the braking unit are arranged on both sides of the drum unit, the drum unit receives the driving force and the braking force from both sides of its length direction respectively, so that the structure for receiving the driving force and the structure for receiving the braking force on the processing box are separated, thereby making the connection between the processing box and the imaging device more reliable, the connection stability better, and the drive transmission smoother.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an imaging device in the prior art;

[0023] Figure 2 for Figure 1 Exploded view of the force transmission unit;

[0024] Figure 3 for Figure 1 A cross-sectional view of the force transmission unit;

[0025] Figure 4 A schematic diagram of the structure of a processing box provided in the present application in a specific embodiment;

[0026] Figure 5 for Figure 4 A schematic diagram of the structure in which the middle processing box is engaged with the driving force transmission member;

[0027] Figure 6 for Figure 4 A partial cross-sectional view of a process cartridge in a specific embodiment;

[0028] Figure 7 for Figure 6 Partial structural exploded view of the processing box;

[0029] Figure 8 for Figure 6 A cross-sectional view of the transmission member and the rotating shaft;

[0030] Fig. 9 for Figure 4 A partial cross-sectional view of a process cartridge in another specific embodiment;

[0031] Fig.10 for Fig. 9 A cross-sectional view of the transmission member and the rotating shaft;

[0032] Fig.11 for Fig.10 Exploded diagram of

[0033] Fig.12 for Figure 4A partial cross-sectional view of a process cartridge in yet another specific embodiment;

[0034] Fig.13 for Fig.12 A cross-sectional view of the transmission member and the rotating shaft;

[0035] Fig.14 for Fig.13 Exploded diagram of

[0036] Fig.15 for Figure 4 A cross-sectional view of the conductive side of the middle process box;

[0037] Fig.16 for Fig.15 A cross-sectional view of the conductive side of the processing box in another direction;

[0038] Fig.17 for Fig.15 Exploded view of part of the structure of the processing box.

[0039] Reference numerals: M-imaging device; 100-processing cartridge;

[0040] 100Y-first processing box;

[0041] 100M-second processing box;

[0042] 100C-third processing box;

[0043] 100K-fourth processing box; 160-door cover;

[0044] 170-main component;

[0045] 171-Pallet;

[0046] 180-driving force transmission member;

[0047] 180a- first flange portion;

[0048] 180b- first protrusion;

[0049] 180c-reinforcement;

[0050] 180d-positioning boss; 185-developing drive coupling member; 201-rotating member;

[0051] 201a- second protrusion;

[0052] 201b-assembly part; 202-support shaft;

[0053] 203 - force transmission unit; 204 - first engagement member; 206 - braking member;

[0054] 207- braking force transmission member; 208- second engagement member; 310- developing unit;

[0055] 311-development frame;

[0056] 320-drum unit;

[0057] 321-Drum frame;

[0058] 322- driving side end cover;

[0059] 323-conductive side end cover;

[0060] 323a-pillar;

[0061] 324-photosensitive drum;

[0062] 325-drum bearing;

[0063] 330-development coupling;

[0064] 340-drum coupling;

[0065] 341-cylindrical part;

[0066] 342- front end;

[0067] 342a-recess;

[0068] 343- elastic member;

[0069] 350-power receiving unit;

[0070] 351-transmission parts;

[0071] 351a-first transmission part;

[0072] 351b- second transmission part;

[0073] 351c - concave and convex steps;

[0074] 351d- flange;

[0075] 352- rolling bearings;

[0076] 353-shaft;

[0077] 353a-cam;

[0078] 353b-through hole;

[0079] 353c-groove;

[0080] 360-brake unit;

[0081] 361- roller;

[0082] 362-Bushing.

[0083] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0084] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0085] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0086] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0087] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0088] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0089] like Figure 1 As shown, there is an existing imaging device M, which includes a main assembly 170, a tray 171 and a door cover 160. The main assembly 170 is provided with a housing, a separation mechanism and a transfer unit, etc. The tray 171 can accommodate a process cartridge 100 and can move relative to the main assembly 170 to install the process cartridge 100 into the housing of the main assembly 170. The door cover 160 is provided on the outside of the main assembly 170, and can open or close the housing of the main assembly 170.

[0090] The tray 171 can generally accommodate four detachably mounted process cartridges 100, namely, a first process cartridge 100Y, a second process cartridge 100M, a third process cartridge 100C, and a fourth process cartridge 100K, and the four process cartridges 100 are arranged substantially horizontally. The process cartridge 100 stores developer, and when the process cartridge 100 is installed in the accommodating portion of the main assembly 170, it can receive the rotational driving force of the imaging device M, so that the imaging device M can use the developer in the process cartridge 100 to perform imaging. At the same time, the imaging device M provides bias voltages (charging bias, developing bias, etc.) to the first to fourth process cartridges 100 (100Y, 100M, 100C, 100K), respectively.

[0091] Specifically, the tray 171 is configured to be movable in a substantially horizontal direction in a state where the imaging device M is mounted on a horizontal surface. The tray 171 can be removed from or mounted on the imaging device M by opening the door cover 160 of the imaging device M.

[0092] The main assembly 170 is provided with a force transmission unit 203, which can engage with the process cartridge 100 and transmit driving force to the process cartridge 100 when the process cartridge 100 is installed in the receiving portion of the main assembly 170. The force transmission unit 203 includes a driving force transmission component and a braking force application component.

[0093] like Figure 2 and Figure 3 As shown, the driving force transmission assembly includes a rotating member 201 and a driving force transmission member 180. The rotating member 201 is rotatably supported on a support shaft 202, and the support shaft 202 is fixed to the main assembly 170. The motor (not shown in the figure) in the main assembly 170 can drive the rotating member 201 to rotate. The driving force transmission member 180 is assembled on the rotating member 201 in a movable manner along the axial direction M1. The axial direction M1 is the rotation axis of the driving force transmission member 180. In the direction of the axis M1, the direction from the driving force transmission member 180 toward the rotating member 201 is the M1A direction, and the direction from the rotating member 201 toward the driving force transmission member 180 is the M1B direction.

[0094] Specifically, the driving force transmission member 180 includes a first flange portion 180a disposed at an end thereof, and the rotating member 201 has an assembly portion 201b, and the first flange portion 180a can cooperate with the assembly portion 201b and be supported by the assembly portion 201b. The driving force transmission member 180 is also provided with a first protrusion 180b protruding from the first flange portion 180a, and the rotating member 201 has a second protrusion 201a, and the first protrusion 180b can contact the second protrusion 201a, so as to transmit the driving force from the rotating member 201 to the driving force transmission member 180, so as to realize that the rotating member 201 drives the driving force transmission member 180 to rotate. It can be understood that the rotating member 201 does not limit the movement of the driving force transmission member 180 along the axial direction M1.

[0095] In addition, the driving force transmission member 180 further includes a reinforcing portion 180c and a positioning boss 180d, which are disposed at the end of the driving force transmission member 180 away from the first flange portion 180a, and the positioning boss 180d is located in the middle of the reinforcing portion 180c. The reinforcing portion 180c can enhance the rigidity of the driving force transmission member 180.

[0096] like Figure 2 and Figure 3 As shown, the braking force applying assembly includes: a braking member 206, a first engaging member 204, a second engaging member 208 and a braking force transmitting member 207. The braking member 206 is fixedly connected to the support shaft 202 and can generate a braking force; the braking force transmitting member 207 passes through the through holes in the middle of the first engaging member 204 and the second engaging member 208 and is connected to the braking member 206, so that the braking force generated by the braking member 206 can be transmitted to the first engaging member 204 and the second engaging member 208. The first engaging member 204 and the second engaging member 208 move synchronously.

[0097] The existing process cartridge receives the driving force and the braking force from the image forming apparatus M by engaging with the force transmission unit 203 .

[0098] The present application provides a process cartridge 100 that can be detachably mounted in an image forming apparatus M provided with a driving force transmission member 180. Figure 4 As shown, the process cartridge 100 includes a developing unit 310 , a drum unit 320 , a driving unit, and a brake unit 360 .

[0099] The developing unit 310 includes a developing frame 311, a developing roller, a powder feeding roller and a powder discharge knife. The developing frame 311 encloses a powder bin for storing developer. The developing frame 311 is roughly in the shape of a long box, and the developing frame 311 is provided with a driving side bearing and a conductive side bearing at both ends of the length direction. The powder feeding roller and the developing roller are rotatably supported on the driving side bearing and the conductive side bearing, and the axial directions of the powder feeding roller and the developing roller are along the length direction of the developing frame 311. The powder feeding roller and the developing roller can rotate under the drive of the driving unit. The powder feeding roller transports the developer to the developing roller, and then the developer is adsorbed by the charged developing roller.

[0100] Specifically, the developing unit 310 further includes: a developing coupling 330, a developing roller gear and a powder feeding roller gear. The developing coupling 330, the developing roller gear and the powder feeding roller gear are arranged on the outside of the driving side bearing. Specifically, the developing coupling 330 is engaged with the developing drive coupling 185 of the imaging device M to receive the driving force from the imaging device M. The driving side bearing is provided with a supporting hole for supporting the developing coupling 330, the developing roller gear is sleeved on one end of the developing roller shaft extending from the driving side bearing, the powder feeding roller gear is sleeved on one end of the powder feeding roller shaft extending from the driving side bearing, and the developing roller gear and the powder feeding roller gear are directly or indirectly meshed with the developing coupling 330 to transmit the driving force received by the developing coupling 330, thereby driving the developing roller and the powder feeding roller to rotate.

[0101] The drum unit 320 includes a drum frame 321, a photosensitive drum 324, and a charging roller. The length direction of the drum frame 321 is consistent with the length direction of the developing frame 311. The drum frame 321 is provided with a driving side end cover 322 and a conductive side end cover 323 at both ends in the length direction. The photosensitive drum 324 is rotatably supported on the driving side end cover 322 and the conductive side end cover 323.

[0102] Specifically, the photosensitive drum 324 is arranged on the lower end side of the drum frame 321 in the height direction. The axial direction of the photosensitive drum 324 is consistent with the length direction of the drum frame 321, and the axial direction of the photosensitive drum 324 is also in the M1 direction. The developing roller and the photosensitive drum 324 are close to each other, and through the potential difference between the developing roller and the photosensitive drum 324, the developer adsorbed on the developing roller is transferred to the photosensitive drum 324, and the toner on the photosensitive drum 324 is transferred through the transfer belt of the imaging device M to form an image on the recording material (such as paper). Among them, the charging roller is used to charge the surface of the photosensitive drum 324 with a uniform charge, so that the photosensitive drum 324 can adsorb toner.

[0103] The driving unit is provided at the driving side of the drum unit 320, and is engaged with the driving force transmitting member 180 to receive the driving force from the imaging device M, thereby driving the photosensitive drum 324 to rotate. The brake unit 360 is provided at the conductive side of the drum unit 320, and the brake unit 360 provides a braking force to the photosensitive drum 324, and the direction of the braking force is opposite to the direction of the driving force.

[0104] In this embodiment, since the driving unit and the braking unit 360 are arranged on both sides of the drum unit 320, the drum unit 320 receives the driving force and the braking force from both sides in the length direction thereof respectively, so that the structure for receiving the driving force and the structure for receiving the braking force on the processing box are separated, thereby making the connection between the processing box and the imaging device M more reliable, the connection stability better, and the drive transmission smoother.

[0105] The structure of the drive unit is described below.

[0106] In a specific embodiment, Figures 4 to 6 As shown, the driving unit includes: a drum coupling 340 and a power receiving part 350, the drum coupling 340 is connected to the photosensitive drum 324, the drum coupling 340 has a recess 342a, and the recess 342a is used to engage with the positioning boss 180d of the driving force transmission member 180; the power receiving part 350 is drivingly connected to the drum coupling 340, and the power receiving part 350 is drivingly connected to the driving force transmission member 180 to receive the driving force of the driving force transmission member 180 and drive the photosensitive drum 324 to rotate. Among them, the photosensitive drum 324 is supported on the driving side end cover 322 through the drum coupling 340.

[0107] In this embodiment, if Figure 5 and Figure 6 As shown, the positioning boss 180d extends into the recess 342a, and the cooperation between the two can position the engagement process of the process cartridge and the driving force transmission member 180, so that the driving force transmission member 180 is precisely engaged with the drum coupling 340. The driving force transmission member 180 transmits the driving force to the power receiving portion 350, and the power receiving portion 350 then transmits the driving force to the drum coupling 340, driving the drum coupling 340 and the photosensitive drum 324 to rotate together, so that the driving force is transmitted from the driving force transmission member 180 to the photosensitive drum 324 more smoothly. Since the power receiving portion 350 maintains a transmission connection state with the driving force transmission member 180, the connection between the process cartridge and the driving force transmission member 180 is also more stable.

[0108] Specifically, Figure 6 As shown, the drum coupling 340 includes: a cylindrical portion 341 and a front end portion 342, wherein at least a portion of one end of the cylindrical portion 341 along the M1B direction is inserted into one end of the photosensitive drum 324, thereby being fixedly connected to the photosensitive drum 324, and the front end portion 342 is arranged at one end of the cylindrical portion 341 along the M1A direction, and the recessed portion 342a is arranged on the end surface of the front end portion 342 facing the M1A direction, and is located at the center axis position of the front end portion 342.

[0109] Optionally, the front end portion 342 may be configured as an elastic body (such as rubber) that can undergo a certain deformation, so that when the driving force transmission member 180 is docked with the drum coupling 340, a certain angle deviation and interference effect are eliminated, allowing the two to engage smoothly.

[0110] Optionally, the front end portion 342 is configured to be retractable, that is, the front end portion 342 has a certain amount of movement relative to the cylindrical portion 341 in the M1 direction, which can also better engage the driving force transmission member 180 with the drum coupling 340. For example, an elastic member 343 is provided between the cylindrical portion 341 and the front end portion 342.

[0111] Specifically, the power receiving part 350 includes a transmission member 351 rotatably connected to the drum frame 321, and the transmission member 351 has a cylindrical first transmission part 351a and a second transmission part 351b. The first transmission part 351a abuts against the reinforcement part 180c, and receives the driving force from the driving force transmission member 180 through the friction force between the first transmission part 351a and the reinforcement part 180c. The second transmission part 351b abuts against the cylindrical part 341, and drives the drum coupling 340 and the photosensitive drum 324 to rotate through the friction force between the drum coupling 340.

[0112] The first transmission part 351a and the second transmission part 351b are coaxially arranged, and the second transmission part 351b is closer to the photosensitive drum 324 than the first transmission part 351a. The outer diameter of the second transmission part 351b is greater than the outer diameter of the first transmission part 351a.

[0113] When the driving force transmission member 180 extends in the M1B direction, the circumferential surface of the first transmission part 351a contacts the circumferential surface of the reinforcing part 180c. When the driving force transmission member 180 rotates, the transmission member 351 rotates due to the friction between the circumferential surface of the reinforcing part 180c and the first transmission part 351a. The circumferential surface of the second transmission part 351b contacts the circumferential surface of the cylindrical part 341. When the transmission member 351 rotates, the friction between the circumferential surface of the second transmission part 351b and the circumferential surface of the cylindrical part 341 drives the drum coupling 340 to rotate, and the photosensitive drum 324 rotates synchronously with the drum coupling 340.

[0114] Since the first transmission part 351a maintains an abutment state with the reinforcement part 180c and the second transmission part 351b maintains an abutment state with the cylindrical part 341, the transmission of the driving force from the driving force transmission component 180 to the photosensitive drum 324 is smoother and the connection between the driving unit and the driving force transmission component 180 is also more stable.

[0115] Further, such as Figure 6 and Figure 7As shown, the power receiving part 350 also includes a rolling bearing 352 and a rotating shaft 353. The outer ring of the rolling bearing 352 is fixed to one side of the driving side end cover 322 along the M1A direction. The rotating shaft 353 is rotationally connected to the inner ring of the rolling bearing 352. The transmission member 351 is sleeved on the rotating shaft 353 and can rotate synchronously with the rotating shaft 353.

[0116] In one embodiment, if Figure 6 to Figure 8 As shown, the rotating shaft 353 is a round rod structure.

[0117] In another embodiment, if Figures 9 to 11 As shown, the rotating shaft 353 has a circle of cams 353 a, and the cams 353 a are correspondingly arranged inside the second transmission part 351 b, so as to provide support for the second transmission part 351 b and maintain the abutment state between the second transmission part 351 b and the cylindrical part 341 .

[0118] In yet another embodiment, Figure 12 to Figure 14 As shown, the cam 353a has a through hole 353b, and a part of the transmission member 351 can pass through the through hole 353b, so that the connection between the transmission member 351 and the rotating shaft 353 is more reliable, preventing the transmission member 351 from falling off the rotating shaft 353.

[0119] Furthermore, the rotating shaft 353 is provided with a circle of grooves 353 c , and the transmission member 351 has a flange 351 d adapted to the grooves 353 c , and the flange 351 d is embedded in the grooves 353 c to prevent the transmission member 351 from falling off the rotating shaft 353 .

[0120] For the above embodiment, the transmission member 351 may be a sleeve-shaped member made of soft rubber material, so that a large friction force can be formed between the first transmission part 351a and the reinforcement part 180c, and a large friction force can be formed between the second transmission part 351b and the cylindrical part 341, thereby realizing transmission through friction. The soft rubber material may be a thermoplastic rubber material (TPR), and the transmission member 351 is formed by injection molding.

[0121] Specifically, when manufacturing the power receiving part 350, the rotating shaft 353 is first inserted into the mold, and then the molten TPR raw material is injected into the mold. The molten TPR raw material forms a wrapped sleeve-shaped component (i.e., the transmission member 351) on the outside of the rotating shaft 353, and then the whole formed by the rotating shaft 353 and the transmission member 351 is installed on the rolling bearing 352.

[0122] Further, such as Figure 7 to Figure 14As shown, when the driving force transmission component 180 is engaged with the driving unit, the end face of the reinforcing portion 180c contacts the end face of the second transmission portion 351b facing the M1A direction. Therefore, a concave-convex step 351c can be provided on the end face of the second transmission portion 351b facing the M1A direction, thereby increasing the friction between the transmission member 351 and the reinforcing portion 180c and better transmitting the driving force.

[0123] Furthermore, the number of the power receiving parts 350 can be multiple, and the multiple power receiving parts 350 are distributed around the circumference of the drum coupling 340 and are all in contact with the drum coupling 340. When the power receiving parts 350 receive the driving force from the driving force transmission member 180, the multiple power receiving parts 350 rotate synchronously, thereby better driving the drum coupling 340 and the photosensitive drum 324 to rotate.

[0124] Preferably, the number of the power receiving parts 350 is two. It is understandable that the number of the power receiving parts 350 may also be three.

[0125] In addition, if Figure 5 As shown, the circumferential surface of the reinforcing portion 180c has a certain taper, that is, along the M1B direction, the outer diameter of the reinforcing portion 180c gradually decreases. In order to better contact with the reinforcing portion 180c, the first transmission portion 351a can also be set with a taper matching the reinforcing portion 180c, that is, along the M1B direction, the outer diameter of the first transmission portion 351a gradually increases.

[0126] The structure of the brake unit 360 is described below.

[0127] In a specific embodiment, Figure 15 to Figure 17 As shown, a drum bearing 325 is provided at one end of the photosensitive drum 324 where the drum coupling 340 is not provided, and the photosensitive drum 324 is supported on the conductive side end cover 323 through the drum bearing 325. The brake unit 360 includes: a roller 361 and a sleeve 362, the roller 361 is rotatably connected to the drum frame 321, the sleeve 362 is sleeved on the roller 361, and the circumferential surface of the sleeve 362 is in interference contact with the circumferential surface of the drum bearing 325, so that the sleeve 362 provides a braking force to the photosensitive drum 324 through the friction between the sleeve 362 and the drum bearing 325, so that the structure of the brake unit 360 is relatively simple.

[0128] Specifically, a support column 323 a is provided on one side of the conductive side end cover 323 facing the driving side end cover 322 , and the roller 361 is sleeved on the support column 323 a and can rotate relative to the support column 323 a .

[0129] More specifically, the sleeve 362 may be a rubber sleeve. When the photosensitive drum 324 receives a driving force to rotate, the sleeve 362 generates a friction force on the drum bearing 325. The photosensitive drum 324 needs to overcome the braking effect of the friction force to drive the sleeve 362 and the roller 361 to rotate synchronously. When the photosensitive drum 324 does not receive a driving force, the friction force between the sleeve 362 and the drum bearing 325 can slow down the rotation speed of the photosensitive drum 324 until the photosensitive drum 324 stops rotating.

[0130] Furthermore, there may be a plurality of brake units 360 , which are distributed around the circumference of the drum bearing 325 and are all in interference contact with the circumferential surface of the drum bearing 325 .

[0131] Preferably, the number of the braking units 360 is three, and the three braking units 360 are evenly distributed, so as to better provide braking force for the photosensitive drum 324 .

[0132] In the present application, since the photosensitive drum 324 does not need to receive the braking force from the force transmission unit 203 through the drum coupling 340, the structure of the drum coupling 340 is simplified, and the problems of unstable connection between the existing processing box and the imaging device and unsmooth drive transmission are solved. The processing box in the present application has the advantages of alignment with the driving force transmission member 180, simple engagement process, more stable engagement, not easy to disengage, more stable and smooth power transmission, and improves the use quality of the processing box.

[0133] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A process cartridge detachably mounted in an imaging device provided with a driving force transmission member, characterized in that: The processing box comprises: A drum unit (320), the drum unit (320) comprising a drum frame (321) and a photosensitive drum (324) rotatably supported on the drum frame (321), wherein along a length direction of the drum unit (320), the drum unit (320) has a driving side and a conductive side; a driving unit, the driving unit being arranged on the driving side and being used to engage with a driving force transmitting member (180) of the imaging device to receive a driving force for driving the photosensitive drum (324) to rotate; A braking unit (360), wherein the braking unit (360) is arranged on the conductive side, and the braking unit (360) provides a braking force to the photosensitive drum (324), wherein the direction of the braking force is opposite to the direction of the driving force.

2. The process cartridge according to claim 1, wherein: The driving unit comprises: a drum coupling (340) connected to the photosensitive drum (324), the drum coupling (340) having a recess (342a) for engaging with a positioning boss (180d) of the driving force transmission member (180); A power receiving part (350), the power receiving part (350) is drivingly connected to the drum coupling (340), and the power receiving part (350) is drivingly connected to the driving force transmission member (180) to receive the driving force of the driving force transmission member (180) and drive the photosensitive drum (324) to rotate.

3. The process cartridge according to claim 2, wherein: The power receiving part (350) includes a transmission member (351) rotatably connected to the drum frame (321), and the transmission member (351) has a cylindrical first transmission part (351a) and a second transmission part (351b), the first transmission part (351a) abuts against the reinforcement part (180c) of the driving force transmission member (180), and receives the driving force from the driving force transmission member (180) through the friction force between the first transmission part (351a) and the reinforcement part (180c), and the second transmission part (351b) abuts against the drum coupling (340), and drives the drum coupling (340) and the photosensitive drum (324) to rotate through the friction force between the first transmission part (351a) and the reinforcement part (180c).

4. The process cartridge according to claim 3, wherein: The drum coupling (340) comprises: A cylindrical portion (341), the cylindrical portion (341) is connected to the photosensitive drum (324) and abuts against the second transmission portion (351b); A front end portion (342), the front end portion (342) is connected to the cylindrical portion (341), and the recessed portion (342a) is arranged on a surface of the front end portion (342) that is away from the cylindrical portion (341).

5. The process cartridge according to claim 3, wherein: The power receiving part (350) further includes: A rolling bearing (352), the rolling bearing (352) being connected to the drum frame (321); A rotating shaft (353) is rotatably connected to the rolling bearing (352), and the transmission member (351) is sleeved on the rotating shaft (353).

6. The process cartridge according to claim 5, wherein: The rotating shaft (353) has a cam (353a) and / or a groove (353c) distributed along its circumference, and the cam (353a) is located inside the second transmission part (351b); the transmission member (351) has a flange (351d), and the flange (351d) is embedded in the groove (353c).

7. The process cartridge according to claim 3, wherein: A concave-convex step (351c) is provided on the surface of the second transmission portion (351b) facing the first transmission portion (351a), and the concave-convex step (351c) is used to abut against the reinforcing portion (180c).

8. The process cartridge according to claim 3, wherein: The first transmission part (351a) and the second transmission part (351b) are coaxially arranged, and the second transmission part (351b) is closer to the photosensitive drum (324) relative to the first transmission part (351a); The outer diameter of the second transmission part (351b) is greater than the outer diameter of the first transmission part (351a).

9. The process cartridge according to claim 2, wherein: The conductive side is provided with a drum bearing (325) connected to the photosensitive drum (324); the braking unit (360) comprises: A roller (361), the roller (361) being rotatably connected to the drum frame (321); A shaft sleeve (362) is sleeved on the outer circumference of the roller (361) and is in interference contact with the drum bearing (325). The shaft sleeve (362) provides a braking force to the photosensitive drum (324) through the friction between the shaft sleeve (362) and the drum bearing (325).

10. The process cartridge according to any one of claims 2 to 9, characterized in that: A plurality of the power receiving parts (350) are arranged along the circumference of the photosensitive drum (324), and / or a plurality of the braking units (360) are arranged along the circumference of the drum bearing (325).

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