Drum assembly and process cartridge

Abstract

The embodiment of the utility model provides a drum assembly and a processing box, and relates to the technical field of electronic imaging. The drum assembly comprises a frame, a photosensitive drum, a storage medium and a protruding part, the frame comprises a first side wall and a second side wall, and the first side wall and the second side wall are located on the two sides of the frame in the first direction respectively; the photosensitive drum is connected with the frame, and the axis of the photosensitive drum extends along a first direction; the storage medium is connected with the frame and comprises an electric contact surface, the electric contact surface is located on the first side wall, and the protruding part is used for abutting against the image forming device. According to the drum assembly and the processing box provided by the embodiment of the utility model, the storage medium can be limited, and the phenomenon that when the processing box shakes in the image forming device, the electric contact surface is separated from the electric contact pin, so that the image forming device reports an error is prevented.

Description

Technical Field

[0001] This utility model relates to the field of electronic imaging technology, and in particular to a drum assembly and processing box. Background Technology

[0002] The drum assembly is a detachable component widely used in image forming apparatuses, serving to carry the developing cartridge. The developing cartridge and drum assembly together form a processing cartridge. The developing cartridge contains a storage medium that stores information about the developing cartridge and transmits this information to the image forming apparatus, enabling the apparatus to recognize the developing cartridge. The drum assembly has a significantly longer lifespan than the developing cartridge.

[0003] However, when the processing cartridge is installed in the image forming apparatus, it may shake inside the apparatus, causing the storage medium to lose contact with the electrical contacts and resulting in an error from the image forming apparatus. Utility Model Content

[0004] This utility model provides a drum assembly and a processing box to solve the problem that when the processing box is installed in the image forming apparatus, it will shake inside the image forming apparatus, causing the storage medium to lose contact with the electrical contact pins and resulting in an error in the image forming apparatus.

[0005] On one hand, this utility model embodiment provides a drum assembly that can be used to carry a developing cartridge, the drum assembly comprising:

[0006] The frame includes a first sidewall and a second sidewall, the first sidewall and the second sidewall being located on opposite sides of the frame in a first direction;

[0007] The photosensitive drum is rotatably supported by the frame, and the axis of the photosensitive drum extends in the first direction;

[0008] An electrode is located on the second sidewall and receives an external voltage;

[0009] A storage medium connected to the frame, the storage medium including an electrical contact surface located on the first sidewall;

[0010] It also includes a protrusion for contacting the image forming apparatus.

[0011] In one possible implementation, the protrusion is located below the electrical contact surface in a third direction perpendicular to the first direction.

[0012] In one possible implementation, the frame is provided with a mounting portion having a recessed structure, and the storage medium is mounted in the recessed structure.

[0013] In one possible implementation, the protrusion extends in the normal direction of the electrical contact surface.

[0014] In one possible implementation, the system further includes a bracket and a bracket cover, the bracket being movably connected to the frame, the mounting portion being disposed on the bracket, the bracket cover being connected to a first sidewall, a cavity being formed between the bracket cover and the first sidewall, and the bracket being located within the cavity.

[0015] In one possible implementation, the bracket includes a first frame and a second frame, the first frame and the second frame are movably connected, the second frame is movably connected to the bracket cover and the first side wall respectively, the mounting part is disposed on the first frame, the protrusion is disposed on the second frame, and an elastic element is disposed between the first frame and the second frame.

[0016] In one possible implementation, a pusher located on the second sidewall is further included, the pusher being electrically connected to the electrode, and the electrical contact surface being further away from the photosensitive drum than the pusher in a second direction perpendicular to the first direction.

[0017] In one possible implementation, a locking element is further included for locking the developing cartridge, wherein the distance between the electrical contact surface and the locking element is less than the distance between the electrical contact surface and the photosensitive drum in a second direction perpendicular to the first direction.

[0018] In one possible implementation, a separator is further included, located on the first sidewall, the separator being used to drive the development cartridge to move, and in a second direction perpendicular to the first direction, the separator being located between the rotation axis of the photosensitive drum and the electrical contact surface.

[0019] On the other hand, this utility model embodiment provides a processing cartridge, including a developing cartridge and a drum assembly as described above;

[0020] The drum assembly carries the developing cartridge.

[0021] This utility model provides a drum assembly and a processing box. The storage medium storing the information of the developing box is placed on the drum assembly, so there is no need to place the storage medium on the developing box. When the life of a developing box is exhausted, only another developing box needs to be replaced to perform the developing work again. That is, multiple developing boxes can work in the image forming apparatus by using a single storage medium, thereby reducing the production cost of developing boxes and avoiding the waste of storage medium, which is beneficial to environmental protection.

[0022] When the processing cartridge is installed into the image forming apparatus, the protrusion abuts against the image forming apparatus to limit the storage medium and prevent the electrical contact surface from losing contact with the electrical contact pin when the processing cartridge shakes inside the image forming apparatus, which would cause the image forming apparatus to report an error. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the developing cartridge being installed onto the drum assembly in Embodiment 1;

[0025] Figure 2 This is an exploded view of the developing cassette and drum assembly in Embodiment 1;

[0026] Figure 3 This is a schematic diagram of the drum assembly in Embodiment 1;

[0027] Figure 4 This is an exploded view of the second sidewall of the drum assembly in Embodiment 1;

[0028] Figure 5 This is an exploded view of the first sidewall of the drum assembly in Embodiment 1;

[0029] Figure 6 This is a schematic diagram of the drum assembly in Embodiment 2;

[0030] Figure 7 This is an exploded view of the identification component in Embodiment 2.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Developing cartridge; 131-Developing roller; 132-Force-bearing component; 2-Drum assembly; 21-First sidewall; 211-Mounting part; 212-Protrusion; 213-First positioning hole; 214-Third positioning post; 215-Inserted part;

[0033] 22-Second sidewall; 221-Receiving groove; 23-Bottom wall; 24-Locking element; 25-Photosensitive drum; 26-Separating element; 27-Electrode; 281-First pushing element; 282-Second pushing element; 31-Storage medium; 311-Electrical contact surface; 32-Bracket; 321-First frame; 322-Second frame; 3221-First positioning post; 3222-Second positioning post; 33-Bracket cover; 331-Second positioning hole; 332-Insert part; 333-Third positioning hole; 35-Screw; 3211-Clamping arm; 3223-Clamping cavity. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

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

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a separate connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] As described in the background section, when a developing cartridge reaches the end of its lifespan, its production cost becomes difficult to control, and it easily leads to waste of storage media, which is detrimental to the environment. The inventors have discovered that this problem arises because when a developing cartridge reaches the end of its lifespan, the storage media is discarded along with the cartridge, making it difficult to control the production cost and easily leading to waste of storage media, which is also detrimental to the environment.

[0040] To address the aforementioned issues, this utility model provides a drum assembly and a processing cartridge. A storage medium containing developer cartridge information is mounted on the drum assembly, eliminating the need for a separate storage medium on the developer cartridge. When a developer cartridge reaches the end of its lifespan, it can be replaced with another to resume imaging. This means that multiple developer cartridges can operate within the image forming apparatus using a single storage medium, thereby reducing the production cost of the developer cartridges and preventing waste of storage medium, which is beneficial to environmental protection.

[0041] The drum assembly and processing box provided in the embodiments of this utility model will be described in detail below with reference to specific embodiments.

[0042] In the following descriptions of direction, perpendicular to Figure 1 When viewed from the direction of the middle paper, Figure 1 The left side of the middle page is left. Figure 1 The left side is located on the paper along the -X-axis. Figure 1The right side of the middle page is the right. Figure 1 The side of the paper facing the +X axis is the right side. Figure 1 The top of the middle paper is the upper part. Figure 1 The side of the paper facing the +Z axis is the top side. Figure 1 The bottom of the middle paper is the lower side. Figure 1 The side of the paper facing the -Z axis is the bottom side. Figure 1 The front side of the middle paper is the side closest to the front. Figure 1 The side facing the +Y axis in the middle of the paper is the near side. Figure 1 The far side of the middle paper is the back. Figure 1 The side of the paper facing the Y-axis is the far side. The left-right direction is one embodiment of the first direction, i.e., the X-axis direction is one embodiment of the first direction; the front-back direction is one embodiment of the second direction, i.e., the Y-axis direction is one embodiment of the second direction; and the up-down direction is one embodiment of the third direction, i.e., the Z-axis direction is one embodiment of the third direction.

[0043] In some examples, the first, second, and third directions are perpendicular to each other.

[0044] Example 1:

[0045] like Figures 1-5 As shown, this embodiment provides a drum assembly 2, which is used to carry the developing cartridge 1. The developing cartridge 1 and the drum assembly 2 are combined to form a processing cartridge, which is detachably installed into the image forming apparatus to perform image forming work.

[0046] See Figure 2 As shown, the developing cartridge 1 stores developer and includes a rotatable developing roller 131. The axis of rotation of the developing roller 131 extends in a first direction, and the developing roller 131 delivers developer to the drum assembly 2.

[0047] The drum assembly 2 includes a frame 20 for supporting the developing cartridge 1.

[0048] The frame 20 includes a first sidewall 21, a second sidewall 22, and a bottom wall 23. The first sidewall 21 and the second sidewall 22 are located on opposite sides of the frame 20 in a first direction, and the bottom wall 23 connects the first sidewall 21 and the second sidewall 22 in the first direction. The first sidewall 21, the second sidewall 22, and the bottom wall 23 surround a hollow portion on the frame 20. The hollow portion is used to carry the developing cartridge 1.

[0049] See Figure 3As shown, the drum assembly 2 also includes a photosensitive drum 25, which is rotatably connected to the frame 20. The photosensitive drum 25 is rotatably supported by the frame 20, and its axis of rotation is parallel to a first direction, i.e., the axis of rotation extends along the first direction. The photosensitive drum 25 contacts the developing roller 131 to receive the developer transferred by the developing roller 131 and form an electrostatic latent image, which is then developed on the printing sheet. The drum assembly 2 is also provided with a corona wire (not shown) to provide electrical power to the photosensitive drum 25 so that the photosensitive drum 25 can receive the developer transferred by the developing roller 131.

[0050] The drum assembly 2 is provided with a push assembly. When the developing cartridge 1 is installed on the drum assembly 2, the push assembly is used to apply a pushing force to the developing cartridge 1, so that the developing roller 131 is in close contact with the photosensitive drum 25, ensuring that the developing roller 131 stably delivers the developer to the photosensitive drum 25.

[0051] The pushing assembly may include one pushing element or multiple pushing elements; no specific limitation is made here. See some examples. Figure 4 and Figure 5 As shown, the push assembly may include two pushers, namely a first pusher 281 and a second pusher 282. The first pusher 281 is positioned close to the first sidewall 21 relative to the second sidewall 22; the second pusher 282 is positioned close to the second sidewall 22 relative to the first sidewall 21. When the developing cartridge 1 is mounted onto the drum assembly 2, the first pusher 281 and the second pusher 282 apply a pushing force to the developing cartridge 1, ensuring that the developing roller 131 is in close contact with the photosensitive drum 25, thereby guaranteeing that the developing roller 131 stably delivers developer to the photosensitive drum 25.

[0052] See Figure 5 As shown, a separating member 26 is provided at the first sidewall 21, and the separating member 26 is rotatably connected to the frame 20. The separating member 26 is rotatably supported by the frame 20, and rotates relative to the frame 20 upon receiving a separating command from the image forming apparatus. In this embodiment, only one separating member 26 is provided.

[0053] The developing cartridge 1 is provided with a force-receiving member 132, which is a protrusion extending in a first direction. In some examples, the processing cartridge is installed in the image forming apparatus, and the separating member 26 rotates against the force-receiving member 132. When the image forming apparatus issues a separation command, the separating member 26 rotates relative to the frame 20, and the separating member 26 applies a separation force to the force-receiving member 132, causing the developing cartridge 1 to move away from the photosensitive drum 25, thereby separating the developing roller 131 and the photosensitive drum 25.

[0054] See Figure 4As shown, a receiving groove 221 is provided at the second sidewall 22. The receiving groove 221 can be a groove in the second sidewall 22 in the first direction, and at least partially penetrates the second sidewall 22.

[0055] The drum assembly 2 also includes an electrode 27 for receiving voltage output from the image forming apparatus and transmitting the voltage to the developing cartridge 1. A receiving groove 221 accommodates the electrode 27 to mount it such that a portion of the electrode 27 is located outside the second sidewall 22, and another portion is located inside the second sidewall 22. A second pusher 282 is abutted to or located on the second sidewall 22, and is electrically connected to the electrode 27; that is, at least part of the second pusher 282 is made of a conductive material. The second pusher 282 transmits the received voltage to the developing roller 131.

[0056] Electrode 27 can be a steel sheet. In other embodiments, electrode 27 can also be other conductive materials such as conductive resin.

[0057] A locking element 24 is also provided near the second side wall 22.

[0058] When the developing cartridge 1 is installed onto the drum assembly 2, the locking member 24 locks the developing cartridge 1 to prevent it from detaching from the drum assembly 2. Simultaneously, the locking member 24 also functions as a lifting element; when it is necessary to remove the developing cartridge 1 from the drum assembly 2, pressing the locking member 24 causes it to move relative to the frame 20. This releases the locking member 24 from the developing cartridge 1 while simultaneously lifting the bottom of the developing cartridge 1, allowing it to move upwards and detach from the drum assembly 2. In other embodiments, the locking member 24 may only have a locking function or a lifting function.

[0059] A recognition component is provided on drum assembly 2. See also Figure 5 As shown, the identification component includes a mounting section 211 and a storage medium 31.

[0060] The mounting portion 211 is located at the rear end of the first sidewall 21. In this embodiment, the mounting portion 211 can be integrally formed with the first sidewall 21. In other embodiments, the mounting portion 211 can be separately connected to the first sidewall 21 by means of bonding, welding, or snap-fitting.

[0061] The mounting portion 211 has a recessed structure in which the storage medium 31 is mounted. In some examples, the recessed structure can be a groove, and the storage medium 31 is securely mounted on the mounting portion 211 by adhesive or welding. In other examples, the storage medium 31 may have a protrusion, and the mounting portion 211 may have a slot. The protrusion and the slot cooperate to allow the storage medium 31 to be conveniently and stably mounted on the mounting portion 211.

[0062] The storage medium 31 also includes a medium body and an electrical contact surface 311. The orientation of the electrical contact surface 311 intersects with the first direction. In this embodiment, the electrical contact surface 311 can directly contact the medium body for electrical connection. In other embodiments, the electrical contact surface 311 can also be electrically connected to the medium body through an intermediary.

[0063] In a second direction perpendicular to the first direction, the electrical contact surface 311 is further away from the photosensitive drum 25 than the first pusher 281 and the second pusher 282; in the first direction, the distance between the electrical contact surface 311 and the first pusher 281 is less than the distance between the electrical contact surface 311 and the second pusher 282. In the second direction perpendicular to the first direction, the separator 26 is located between the rotation axis of the photosensitive drum 25 and the electrical contact surface 311. When the developing cartridge 1 is mounted on the drum assembly 2, and both are installed as processing cartridges within the image forming apparatus, the electrical contact surface 311 contacts the electrical contacts within the image forming apparatus to transmit information from the storage medium 31 to the image forming apparatus, enabling the image forming apparatus to recognize the processing cartridge. In the second direction perpendicular to the first direction, the distance between the electrical contact surface 311 and the locking member 24 is less than the distance between the electrical contact surface 311 and the photosensitive drum 25.

[0064] Furthermore, a protrusion 212 is provided connected to the mounting portion 211. The protrusion 212 is located on the third-party side of the mounting portion 211. Specifically, in the third-party direction, the protrusion 212 is located below the mounting portion 211, that is, below the electrical contact surface 311. The protrusion 212 extends in the normal direction of the electrical contact surface 311. When the processing cartridge is installed into the image forming apparatus, the protrusion 212 abuts against the image forming apparatus to limit the storage medium 31 and prevent the electrical contact surface 311 from disengaging from the electrical contact pins and causing the image forming apparatus to report an error when the processing cartridge shakes within the image forming apparatus.

[0065] This embodiment eliminates the need for a storage medium 31 containing information about the developing cartridge 1 on the drum assembly 2. Once a developing cartridge 1 reaches the end of its lifespan, it can be replaced with another developing cartridge 1 for resuming imaging. In other words, multiple developing cartridges 1 can operate within the image forming apparatus using only one storage medium 31. This embodiment reduces the production cost of the developing cartridge 1 and avoids waste of the storage medium 31, thus contributing to environmental protection.

[0066] Example 2:

[0067] Unless otherwise specified, the structure of the developing cartridge in this embodiment is the same as that in Embodiment 1. The main difference between this embodiment and Embodiment 1 lies in the arrangement of the identification component.

[0068] like Figure 6 and Figure 7As shown, in this embodiment, the identification component is movably mounted on the frame 20 of the drum assembly 2. The identification component includes a storage medium 31 and a bracket 32. The bracket 32 ​​is movably connected to the frame 20. The bracket 32 ​​is provided with a mounting portion, which has a recessed structure in which the storage medium 31 is mounted. The mounting portion is movable relative to the frame 20.

[0069] In some examples, the support 32 includes a first frame 321 and a second frame 322, which are movably connected and can move relative to each other. Exemplarily, an elastic element is connected between the first frame 321 and the second frame 322, allowing the first frame 321 and the second frame 322 to move relative to each other. In some examples, the elastic element can be a spring.

[0070] In some examples, the first frame 321 has a locking arm 3211 and the second frame 322 has a locking cavity 3223, the locking arm 3211 is movably locked in the locking cavity 3223, an elastic element is located in the locking cavity 3223, and the elastic element connects the first frame 321 and the second frame 322.

[0071] The first frame 321 is provided with a mounting part, and the storage medium 31 is mounted on the mounting part of the first frame 321.

[0072] The second frame 322 is provided with a first positioning post 3221 and a second positioning post 3222 extending in a first direction. The first positioning post 3221 and the second positioning post 3222 are respectively located on both sides of the second frame 322 in the first direction.

[0073] The first sidewall 21 is provided with a first positioning hole 213, a third positioning post 214 and an insertion part 215.

[0074] The drum assembly 2 also includes a bracket cover 33, which is connected to the first side wall 21. A cavity is formed between the bracket cover 33 and the first side wall 21, and the bracket 32 ​​is located in the cavity.

[0075] In some examples, the bracket cover 33 includes a second positioning hole 331, a third positioning hole 333, and an insertion part 332. The insertion part 332 is inserted into the inserted part 215, and the third positioning post 214 is inserted into the third positioning hole 333, so that the bracket cover 33 is connected to the frame 20, and then the bracket cover 33 is further fixed by screws 35. In some examples, the inserted part 215 can be a hole structure, and the insertion part 332 can be a protrusion structure, so that the insertion part 332 can be inserted into the inserted part 215. A cavity is formed between the bracket cover 33 and the first sidewall 21, and the bracket 32 ​​is located in the cavity.

[0076] The first positioning post 3221 of the second frame 322 is inserted into the first positioning hole 213, and the second positioning post 3222 is inserted into the second positioning hole 331, so that the bracket 32 ​​is supported by the first side wall 21 and the bracket cover 33.

[0077] The second frame 322 is movably connected to the bracket cover 33 and the first sidewall 21, respectively. In some examples, the first positioning hole 213 and the second positioning hole 331 are both circular in shape, and their axes extend along a first direction. The first positioning post 3221 and the second positioning post 3222 are both cylindrical in shape, and their axes extend along the first direction. In the radial direction perpendicular to the first direction, the size of the first positioning hole 213 is larger than the size of the first positioning post 3221, and the size of the second positioning hole 331 is larger than the size of the second positioning post 3222, thus allowing the bracket 32 ​​to move relative to the first sidewall 21 and the bracket cover 33, i.e., the storage medium 31 can move with the bracket 32 ​​relative to the frame 20.

[0078] In this embodiment, the storage medium 31 can move relative to the frame 20, so that when the drum assembly 2 is installed into the image forming apparatus, the second frame 322 moves relative to the frame 20 to avoid contact with the components inside the image forming apparatus, thereby ensuring that the storage medium 31 can be smoothly installed into the image forming apparatus and make stable contact with the electrical contact pin. That is, in this embodiment, the protrusion is the lower end of the second frame 322.

[0079] This utility model provides a processing box, including a developing box and a drum assembly; the drum assembly carries the developing box.

[0080] The drum assembly in this embodiment has the same structure as the drum assembly provided in any of the above embodiments and can bring the same or similar technical effects. It will not be described in detail here, but can be referred to the description of the above embodiments.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A drum assembly for carrying a developing cartridge, the drum assembly comprising: The frame includes a first sidewall and a second sidewall, the first sidewall and the second sidewall being located on opposite sides of the frame in a first direction; The photosensitive drum is rotatably supported by the frame, and the axis of rotation of the photosensitive drum extends in the first direction; An electrode is located on the second sidewall and receives an external voltage; A storage medium connected to the frame, the storage medium including an electrical contact surface located on the first sidewall; The feature is that it further includes a protrusion for contacting the image forming apparatus.

2. The drum assembly according to claim 1, characterized in that, In a third direction perpendicular to the first direction, the protrusion is located below the electrical contact surface.

3. The drum assembly according to claim 2, characterized in that, The frame is provided with a mounting part, the mounting part having a recessed structure, and the storage medium is installed in the recessed structure.

4. The drum assembly according to claim 2, characterized in that, The protrusion extends in the normal direction of the electrical contact surface.

5. The drum assembly according to claim 2, characterized in that, It also includes a bracket and a bracket cover. The bracket is movably connected to the frame, and the mounting part is disposed on the bracket. The bracket cover is connected to a first side wall, and a cavity is formed between the bracket cover and the first side wall. The bracket is located in the cavity.

6. The drum assembly according to claim 5, characterized in that, The bracket includes a first frame and a second frame. The first frame is movably connected to the second frame, and the second frame is movably connected to the bracket cover and the first side wall, respectively. The mounting part is disposed on the first frame, the protrusion is disposed on the second frame, and an elastic element is disposed between the first frame and the second frame.

7. The drum assembly according to claim 1, characterized in that, It also includes a pusher located on the second sidewall, the pusher being electrically connected to the electrode, and the electrical contact surface being further away from the photosensitive drum than the pusher in a second direction perpendicular to the first direction.

8. The drum assembly according to claim 1, characterized in that, It also includes a locking element for locking the developing cartridge, wherein in a second direction perpendicular to the first direction, the distance between the electrical contact surface and the locking element is less than the distance between the electrical contact surface and the photosensitive drum.

9. The drum assembly according to claim 1, characterized in that, It also includes a separator located on the first sidewall, the separator being used to drive the development cartridge to move, and in a second direction perpendicular to the first direction, the separator being located between the rotation axis of the photosensitive drum and the electrical contact surface.

10. A processing box, characterized in that, Includes a developing cartridge and a drum assembly as described in any one of claims 1-9; The drum assembly carries the developing cartridge.

Images