Developing box

Abstract

The utility model provides a developing box which is detachably mounted on a drum assembly of an image forming device, the image forming device comprises a power output shaft, and the developing box comprises a box body, a driving device and a driving device, a developing roller located at the third end and rotating about a rotation axis extending in the first direction; the driving part is located at the first end, rotates around a rotating axis extending in the first direction and is used for receiving power transmitted by the power output shaft; the abutting part is arranged at the first end and used for abutting against the power output shaft, in the second direction, the abutting part is located between the rotation axis of the developing roller and the rotation axis of the driving part, and the abutting part is used for abutting against the power output shaft; according to the utility model, the abutting part is arranged at the first end of the box body and abuts against the power output shaft, so that the power output shaft can be prevented from falling into a gap between the drum assembly and the driving part in the installation process of the drum assembly, the drum assembly can be ensured to be smoothly installed at a preset position, and the power output shaft and the driving part can be connected with each other.

Description

[0001] This application claims priority to Chinese Patent Application No. 202420941698.6, filed on April 30, 2024, entitled “Developer Box”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model relates to the field of image forming apparatus technology, and more specifically, to a developing cartridge. Background Technology

[0003] The developing cartridge is a detachable component widely used in image forming apparatuses. It is typically detachably mounted on the drum assembly, after which the drum assembly and developing cartridge are installed together in the image forming apparatus for use. A power output shaft is located on the side wall of the image forming apparatus. A transmission assembly is mounted on the developing cartridge, with its drive unit exposed and engaging with the power output shaft. The power output shaft is connected to the developing roller and powder feed roller inside the developing cartridge via the transmission assembly, driving their rotation. The developing cartridge also includes a support and a storage medium; the support supports the storage medium, and neither should move relative to the cartridge body.

[0004] To ensure smooth connection between the power output shaft and the transmission components, the image forming apparatus is also equipped with an elastic element. The power output shaft is connected to the elastic element, and its end can move along the axial direction of the power output shaft under the action of the elastic element. During the installation of the drum assembly into the image forming apparatus, the first sidewall of the drum assembly abuts against the end of the power output shaft. The power output shaft avoids the first sidewall of the drum assembly under the action of the elastic element. After the drum assembly moves to the predetermined position, the power output shaft extends outward under the action of the elastic element, thus completing the connection between the power output shaft and the drive unit.

[0005] There is a large gap between the first sidewall of the existing drum assembly and the drive unit. During the installation of the drum assembly, once the power output shaft is aligned with the gap, the power output shaft loses the contact of the first sidewall. Under the action of the elastic element, the end of the power output shaft will fall into the gap, making it impossible to install. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a developing cartridge to overcome the problem that the power output shaft of existing developing cartridges and drum assemblies can easily fall into gaps and become impossible to install during the installation process to an image forming apparatus.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a developing cartridge, detachably mounted on the drum assembly of an image forming apparatus, the image forming apparatus including a power output shaft, the developing cartridge comprising:

[0008] The box has a first end and a second end that are arranged opposite to each other in a first direction, and a third end and a fourth end that are arranged opposite to each other in a second direction, wherein the first direction and the second direction intersect each other.

[0009] The developing roller, located at the third end, rotates about a rotation axis extending in the first direction;

[0010] A drive unit, located at the first end, rotates about a rotation axis extending in a first direction, and receives power transmitted by the power output shaft; an abutment unit, disposed at the first end, is located in a second direction between the rotation axis of the developing roller and the rotation axis of the drive unit, and is used to abut against the power output shaft.

[0011] In some embodiments, the drum assembly includes a first sidewall, and when the developing cartridge is mounted to the drum assembly, at least a portion of the abutment portion is located between the first sidewall and the drive portion in the second direction.

[0012] In some embodiments, a cover is also included, which at least partially covers the drive portion, and the abutment portion is disposed on the cover, the abutment portion being a protrusion extending in a first direction.

[0013] In some embodiments, the cover includes a collar portion surrounding the drive portion, wherein, in the first direction, the distal end of the abutment portion is flush with the distal end of the collar portion.

[0014] In some embodiments, the abutment portion is disposed around the collar portion.

[0015] In some embodiments, an identification component is also included, the identification component including a bracket and a storage medium, the bracket supporting the storage medium, the bracket and the storage medium being fixedly mounted to the first end, and in the second direction, the abutment portion being closer to the third end than the storage medium.

[0016] In some embodiments, a separator is also included, which extends in the first direction, and in the second direction, the abutment portion is closer to the fourth end than the separator.

[0017] In some embodiments, in the first direction, the distal end of the abutment portion is not lower than the end face of the first sidewall.

[0018] In some embodiments, in the first direction, the distal end of the abutment portion is flush with the distal end of the drive portion.

[0019] In some embodiments, a developing gear that rotates coaxially with the developing roller is also included, and the driving unit includes a driving gear, with at least two gears between the driving gear and the developing gear to transmit power. In summary, this utility model has the following beneficial effects: A developing cartridge is detachably mounted on the drum assembly of an image forming apparatus, the image forming apparatus including a power output shaft. The developing cartridge includes: a cartridge body having a first end and a second end oppositely arranged in a first direction, and a third end and a fourth end oppositely arranged in a second direction, the first and second directions intersecting each other; a developing roller located at the third end, rotating about a rotation axis extending in the first direction; a drive unit located at the first end, rotating about a rotation axis extending in the first direction, the drive unit being used to receive power transmitted by the power output shaft; and an abutment part located at the first end, for abutting against the power output shaft, in the second direction, the abutment part being located between the rotation axis of the developing roller and the rotation axis of the drive unit, the abutment part being used to abut against the power output shaft; by providing an abutment part at the first end of the cartridge body for abutting against the power output shaft, this utility model can prevent the power output shaft from falling into the gap between the drum assembly and the drive unit during the installation process, ensuring that the drum assembly can be smoothly installed in the predetermined position, and enabling the power output shaft and the drive unit to connect with each other. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the developing cartridge in Example 1;

[0021] Figure 2 This is an exploded view of the first end of the developing cartridge in Example 1;

[0022] Figure 3 This is an exploded view of the developing cartridge in Example 1;

[0023] Figure 4 This is a partial schematic diagram of the box body in Embodiment 1;

[0024] Figure 5 This is another partial schematic diagram of the box body in Embodiment 1;

[0025] Figure 6 This is a schematic diagram of the box structure in the first modified example of Embodiment 1;

[0026] Figure 7 This is a schematic diagram of the structure of the developing cartridge installed to the drum assembly in Embodiment 2;

[0027] Figure 8 This is a schematic diagram of the cover structure in Embodiment 2;

[0028] Figure 9 This is a schematic diagram of the structure in Embodiment 2 where the power output shaft abuts against the first sidewall;

[0029] Figure 10This is an exploded view of the structure in Embodiment 2 where the power output shaft abuts against the abutting protrusion;

[0030] Figure 11 This is a schematic diagram of the connection between the power output shaft and the drive unit in Embodiment 2.

[0031] In the diagram: 1. Developing cartridge; 10. Cartridge body; 11. First end; 12. Second end; 13. Third section; 14. Fourth section; 15. Fifth end; 16. Sixth end; 101. Protective cover; 1011. Neck ring; 1012. Abutment protrusion; 1013. Mounting bracket; 102. Baffle; 131. Developing roller; 132. Separator; 133. Abutment; 20. Drum assembly; 201. First side wall; 210. Drum frame; 40. Drive unit; 401. Power receiving unit; 402. Drive gear; 41. Developing gear; 42. Powder feeding gear; 43. Idler wheel; 31. Support; 32. Storage medium; 30. Reinforcing part; 301. Reinforcing protrusion; 302. Adhesive part; 303. Reinforcing groove; 90. Side end; 901. Power output shaft; 902. Elastic element. Detailed Implementation

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. 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 with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0033] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0035] Example 1

[0036] For ease of description, using Figure 1 Based on the shown state, the developing cartridge 1 has a first direction, a second direction, and a third direction, which intersect each other. In this embodiment, the left-right direction is described as the first direction, the front-back direction as the second direction, and the up-down direction as the third direction, without limiting the first, second, and third directions. The developing cartridge 1 includes a cartridge body 10; the cartridge body 10 has a receiving cavity for containing developer. The cartridge body 10 has a first end 11 (right end) and a second end 12 (left end) arranged opposite each other in the first direction; the cartridge body 10 has a third end 13 (front end) and a fourth end 14 (rear end) arranged opposite each other in the second direction; and the cartridge body 10 has a fifth end 15 (upper end) and a sixth end 16 (lower end) arranged opposite each other in the third direction.

[0037] Image forming apparatuses use electrophotographic imaging methods to form images on recording materials, including copiers, fax machines, printers (laser beam printers, LED printers, etc.), and corresponding multifunction printers. An image forming apparatus includes a main frame, a developing cartridge 1, and a drum assembly 20. The developing cartridge 1 can be attached to the drum assembly 20 to form a processing cartridge, and then both are mounted within the main frame of the image forming apparatus.

[0038] like Figures 9-11As shown, the side end 90 of the image forming apparatus is provided with a power output shaft 901 and an elastic element 902. The power output shaft 901 can be connected to the transmission component in the developing cartridge 1 to provide driving force to the developing cartridge 1.

[0039] like Figure 8 As shown, the drum assembly 20 includes a drum frame 210 and a photosensitive drum (not shown in the figure). The drum frame 210 is used to support the photosensitive drum and carry the developing cartridge. The drum frame 210 includes a first sidewall 201 and a second sidewall that are disposed opposite to each other in a first direction. The first sidewall 201 is the right end of the drum assembly, and the second sidewall is the left end of the drum assembly. The photosensitive drum is rotatably supported on the first sidewall 201 and the second sidewall. The rotation axis of the photosensitive drum extends along the first direction. The photosensitive drum is located at the third end of the drum frame 210, which is the front end of the drum frame.

[0040] like Figures 1-6 As shown, this embodiment provides a developing cartridge 1, which is detachably installed in and operates within an image forming apparatus. The developing cartridge 1 includes a cartridge body 10, a developing assembly, a transmission assembly, a separation assembly, and an identification assembly. The developing cartridge 1 is provided with a plurality of screws for fixing the remaining components of the developing cartridge 1 to the cartridge body 10 together.

[0041] like Figure 2 and Figure 7 As shown, a transmission assembly is disposed at the first end 11 for receiving and transmitting external power. The transmission assembly includes a drive unit 40, which includes a power receiving unit 401 and a drive gear 402. The two can be integrally formed or combined. In the first direction, the drive gear 402 is closer to the first end 11 than the power receiving unit 401. The power receiving unit 401 is used to receive the power output by the image forming apparatus (i.e., external power), thereby driving the drive gear 402 to rotate. The transmission assembly also includes a developing gear 41, a powder feeding gear 42, and an idler wheel 43. The drive gear 402 transmits power to the developing gear 41 and the powder feeding gear 42. The developing gear 41 receives the power transmitted by the drive gear 402 through the idler wheel 43. There is at least one idler wheel 43. The drive gear 402 transmits power to the developing gear 41 through the powder feeding gear 42 and the idler wheel 43. Alternatively, two idler wheels can be used to transmit power to the developing gear 41. The developing gear 41 and the powder feeding gear 42 respectively drive the developing roller 131 and the powder feeding roller to rotate. This embodiment does not limit the number of gears or the meshing relationship of the transmission assembly, and can be set according to actual needs. In the second direction, the abutment part is provided at the position between the developing gear 41 and the driving gear 402.

[0042] The first end 11 is also provided with a cover 101, which is detachably installed on the housing 10 by means of screws or buckles. The cover 101 covers at least the transmission component to protect the transmission component. The drive gear 402 of the drive unit 40 is covered inside the cover 101, and the power receiving unit 401 is exposed outside the cover 101 after passing through the cover 101. The cover 101 is provided with a collar portion 1011 extending in the first direction. The collar portion 1011 is hollow and is used to protect the power receiving unit 401 and expose the power receiving unit 401 to the outside so as to receive external power.

[0043] like Figure 1 As shown, the developing assembly includes a developing roller 131 and a powder feeding roller (not shown in the figure), which are rotatably supported by the cartridge body 10. The powder feeding roller is disposed adjacent to the developing roller 131 and delivers developer to the developing roller 131.

[0044] like Figure 1 and Figure 2 As shown, the separation assembly includes a separating member 132 located at the first end 11 and an abutting member 133 located at the second end 12. The separating member 132 receives an external separating force to drive the cartridge 10 to move. During the movement of the cartridge 10, the abutting member 133 abuts against the drum assembly on the image forming apparatus, causing the cartridge 10 to swing around the abutting member 133 as a fulcrum, thereby causing the developing roller 131 to disengage from the photosensitive drum inside the image forming apparatus. In this embodiment, the separating member 132 is preferably integrally formed with the cover 101 and protrudes in the first direction; in some embodiments, they can also be assembled separately. In some embodiments, a separating member can also be provided at the second end 12.

[0045] like Figure 1 and Figure 2 As shown, in the first direction, the identification component is located at the first end 11. The identification component includes a bracket 31 and a storage medium 32. The storage medium 32 is used to store information of the developing cartridge 1. The storage medium 32 includes an electrical contact surface integrally formed therewith or separately electrically connected to it. When the developing cartridge 1 is installed in the image forming apparatus, the electrical contact surface contacts the components inside the image forming apparatus to transmit information to the image forming apparatus, so that the developing cartridge 1 is identified by the image forming apparatus. The bracket 31 is used to support the storage medium 32. The bracket 31 is fixedly connected to the cover 101 in a detachable manner. Neither the bracket 31 nor the storage medium 32 can move relative to the cartridge body 10 (i.e., it is fixedly installed in the cartridge body). However, in some embodiments, they can move relative to the cartridge body 10.

[0046] like Figures 3-5As shown, a reinforcing part 30 is also provided on the box body 10. The reinforcing part 30 is located at the third end 13 of the box body and is provided near the developing roller 131. The reinforcing part 30 is used to strengthen the strength of the third end 13 of the box body 10, prevent the box body 10 from deforming during injection molding, and thus ensure the quality of the developing box 1.

[0047] Specifically, in this embodiment, the reinforcing part 30 is disposed on the inner surface of the housing 10. The reinforcing part 30 includes reinforcing protrusions 301, which are serrated protrusions that protrude toward the fourth end 14. Multiple reinforcing protrusions 301 are provided and arranged in a first direction. In the first direction, the reinforcing protrusions 301 are located between the first end 11 and the second end 12. Gaps are provided between the multiple reinforcing protrusions 301. This structure can reinforce the housing 10 while preventing shrinkage of the housing 10 during injection molding. In the first direction, there is a gap between the storage medium 32 and the reinforcing part 30.

[0048] An adhesive portion 302 is also provided near the reinforcing protrusion 301. The adhesive portion 302 is a flat plane. The adhesive portion 302 extends in the first direction and in the second direction, the adhesive portion 302 is further away from the fourth end 14 than the reinforcing protrusion 301.

[0049] A baffle 102 is provided on the developing cartridge 1. The baffle 102 is preferably attached to the adhesive portion 302 by means of adhesive. When the baffle 102 is attached to the adhesive portion 302, it at least covers the reinforcing protrusion 301. The baffle 102 is used to prevent developer from leaking to the outside of the cartridge body 10.

[0050] like Figure 6 As shown, in the first modified embodiment, the reinforcing part 30 includes a reinforcing groove 303 and an adhesive part 302. The reinforcing groove 303 is a recessed groove that is recessed downward in a third direction, and multiple reinforcing grooves are provided. The multiple reinforcing grooves 303 are spaced apart in a first direction, and a separating rib is provided between the multiple reinforcing grooves 303. The separating rib extends in a second direction. When the baffle 102 is adhered to the adhesive part 302, the baffle 102 at least covers a portion of the reinforcing groove 303.

[0051] In some embodiments, the reinforcing part is disposed on the outer surface of the sixth end of the housing 10. The reinforcing part is a reinforcing rib. The reinforcing rib extends in a first direction and also extends in a second direction. That is, the reinforcing rib includes a first end and a second end. The first end extends toward the second end. In the second direction, the first end is farther away from the fourth end 14 than the second end. In the first direction, the first end is farther away from the second end 12 than the second end.

[0052] When the developing cartridge 1 is installed onto the drum assembly 2, the first side wall 201 is adjacent to the first end 11. When the developing cartridge 1 is installed onto the drum assembly 2, there is a large gap between the first side wall 201 and the drive part 40. The first side wall 201, the gap and the drive part 40 are located approximately in the second direction. That is, in the second direction, the gap is located between the first side wall 201 and the drive part 40. When the drum assembly is installed along the second direction, the power output shaft 901 is likely to fall into the gap, causing the installation of the drum assembly 20 to be obstructed and the developing cartridge 1 to be unable to receive power.

[0053] To prevent the power output shaft 901 from falling into the gap between the first side wall 201 of the drum assembly and the drive unit 40, this embodiment also provides an abutment portion at the first end 11 of the developing cartridge 1, which can abut against the power output shaft 901. The abutment portion is used to abut against the power output shaft 901. In the second direction, the abutment portion is located between the rotation axis of the developing roller and the rotation axis of the drive unit.

[0054] like Figure 7 and Figure 8 As shown, the abutment portion is provided on the cover 101 and can be fixed to the cover by screws or by integral molding; the abutment portion is specifically an abutment protrusion 1012. The abutment protrusion 1012 extends in a first direction and is spaced apart from the neck ring portion 1011. In a second direction, the abutment protrusion 1012 is located between the rotation axis of the developing roller 131 and the rotation axis of the drive portion 40. The mounting bracket 1013 is located on the rear side of the cover 101 and engages with the bracket 31 so that the cover 101 supports the bracket 31, thereby allowing the storage medium 32 to be stably mounted on the cartridge 10. The separator 132 extends in the first direction and in the second direction, the separator 132 is further away from the mounting bracket 1013 than the abutment protrusion 1012.

[0055] like Figure 9 As shown, during the process of mounting the developing cartridge 1 onto the drum assembly 20 and together installing them into the image forming apparatus in a generally second direction, the first sidewall 201 of the drum assembly 20 contacts the power output shaft 901 and causes the power output shaft 901 to move away under the action of the elastic member 902, so that the drum assembly 20 and the developing cartridge 1 can continue to be installed into the image forming apparatus in the installation direction.

[0056] like Figure 10As shown, the developing cartridge 1 and drum assembly 20 are installed. The power output shaft 901 abuts against the abutment protrusion 1012 located between the first side wall 201 and the neck collar 1011 to prevent the power output shaft 901 from falling into the gap between the first side wall 201 and the neck collar 1011 under the action of the elastic member 902 after losing contact with the first side wall 201. This prevents the developing cartridge 1 and drum assembly 20 from being unable to continue to be installed into the image forming apparatus along the second direction.

[0057] like Figure 11 As shown, the developing cartridge 1 and drum assembly 20 are installed. The power output shaft 901 loses contact with the abutment protrusion 1012 and connects to the drive unit 40 through the hole in the neck ring 1011, thereby transmitting power to the drive unit 40, so that the components on the developing cartridge 1 can move.

[0058] In this embodiment, in the second direction, the abutment protrusion 1012 is closer to the fourth end and farther from the third end than the separator, that is, closer to the rear end of the developing cartridge 1.

[0059] In this embodiment, in the second direction, the abutment protrusion 1012 is closer to the third end than the identification component.

[0060] In this embodiment, in the second direction, the abutment protrusion 1012 is closer to the third end than the drive portion 40. Since the drive portion 40 is closer to the third end than the identification component in the second direction, and the abutment protrusion 1012 is closer to the third end than the drive portion in the second direction, by defining the position of the abutment protrusion, the abutment protrusion 1012 can provide a more accurate and stable abutment to the power output shaft 901.

[0061] When the developing cartridge 1 is installed on the drum assembly 2, in order to ensure that the abutment part can smoothly connect the first sidewall and the drive part, the distal end of the abutment part in the first direction should be close to the end face of the first sidewall 201. In this embodiment, it is preferable that the distal end of the abutment part in the first direction is not lower than the end face of the first sidewall 201. More preferably, the distal end of the abutment part in the first direction is level with the distal end of the neck ring 1011 in the first direction, or the distal end of the abutment part in the first direction is level with the distal end of the drive part 40 in the first direction.

[0062] The abutment protrusion 1012 can be connected to the neck ring by a reinforcing rib to enhance the strength of the abutment protrusion. The reinforcing rib can also provide abutment effect for the power output shaft 901, making the connection between the various parts smoother and more stable.

[0063] In some embodiments, instead of providing a separate abutment protrusion 1012, the thickness of the neck collar portion 1011 in the radial direction can be directly increased so that the abutment protrusion 1012 and the neck collar portion 1011 are integrally formed, that is, the abutment protrusion 1012 surrounds the neck collar portion 1011. The distance between the thickened neck collar portion 1011 and the first sidewall 201 can be less than a certain distance threshold, or it can be sleeved on the neck collar portion 1011. For example, the gap between the two is less than the minimum distance on the end section of the power output shaft 901. In this way, no matter what direction the power output shaft 901 rotates, it will not get stuck in this gap. Before the power output shaft 901 loses the abutment of the first sidewall 201, it will be abutted by the neck collar portion 1011. That is, the annular sidewall of the neck collar portion 1011 serves as the abutment for the power output shaft 901, so that the power output shaft 901 can be smoothly connected to the drive unit 40.

[0064] In other embodiments, the width of the gap between the drive part 40 and the first side wall 201 can be reduced by increasing the radial wall thickness of the drive part 40, so that the power output shaft 901 will be abutted by the side wall of the drive part 40 before it loses contact with the first side wall 201. That is, the abutting part is integrated with the drive part 40, or it can be sleeved on the drive part 40 so that the power output shaft 901 can be smoothly connected to the drive part 40.

[0065] In other embodiments, the abutment portion can also be integrally formed with the first sidewall 201 of the drum assembly 20, and the abutment portion extends along the second direction, which can also reduce the gap size between the edge of the first sidewall 201 and the drive portion 40, and can effectively prevent the power output shaft 901 from falling into the gap.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A developing cartridge, detachably mounted on a drum assembly of an image forming apparatus, the image forming apparatus including a power output shaft, the developing cartridge comprising: The box has a first end and a second end that are arranged opposite to each other in a first direction, and a third end and a fourth end that are arranged opposite to each other in a second direction, wherein the first direction and the second direction intersect each other. The developing roller, located at the third end, rotates about a rotation axis extending in the first direction; A drive unit, located at the first end, rotates about a rotation axis extending in a first direction, and the drive unit receives power transmitted by the power output shaft; an abutment unit, disposed at the first end, is located in a second direction between the rotation axis of the developing roller and the rotation axis of the drive unit. The feature is that the abutting portion is used to abut against the power output shaft.

2. A developing cartridge according to claim 1, characterized in that, The drum assembly includes a first sidewall, and when the developing cartridge is mounted to the drum assembly, at least a portion of the abutment portion is located between the first sidewall and the drive portion in the second direction.

3. A developing cartridge according to claim 2, characterized in that, It also includes a cover that at least partially covers the drive unit. The abutting portion is disposed on the cover, and the abutting portion is a protrusion extending in a first direction.

4. A developing cartridge according to claim 3, characterized in that, The cover includes a neck collar portion that surrounds the drive portion, and in the first direction, the distal end of the abutment portion is flush with the distal end of the neck collar portion.

5. A developing cartridge according to claim 4, characterized in that, The abutting portion is provided around the neck collar portion.

6. A developing cartridge according to claim 4, characterized in that, It also includes an identification component, which includes a bracket and a storage medium. The bracket supports the storage medium and is fixedly installed on the first end. In the second direction, the abutment portion is closer to the third end than the storage medium.

7. A developing cartridge according to claim 3, characterized in that, It also includes a separator that extends in the first direction, and in the second direction, the abutment portion is closer to the fourth end than the separator.

8. A developing cartridge according to claim 2, characterized in that, In the first direction, the distal end of the abutment portion is not lower than the end face of the first sidewall.

9. A developing cartridge according to claim 1, characterized in that, In the first direction, the distal end of the abutment portion is flush with the distal end of the drive portion.

10. A developing cartridge according to claim 9, characterized in that, It also includes a developing gear that rotates coaxially with the developing roller, and the driving unit includes a driving gear, with at least two gears between the driving gear and the developing gear to transmit power.

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