Developing box

Abstract

The developing box comprises a box body; a developing roller; the developing roller comprises a first part and a second part, and the first part is closer to the first end than the second part; the driving part is used for receiving power output by the image forming device to rotate; the abutting part is arranged at the first end and can abut against the first abutting part, and at least one part of the abutting part can move relative to the box body so as to receive a second reaction force enabling the first part of the developing roller to be close to the photosensitive drum or enabling the first part of the developing roller to be far away from the photosensitive drum; the developing cartridge is arranged in a way that when the driving part receives power output by the image forming device to rotate, the first part of the developing roller moves to a position in contact with the photosensitive drum. According to the utility model, the first end of the developing box drives the developing roller to be contacted with the photosensitive drum through the rotation of the driving part, and the first part of the developing roller is contacted with or separated from the photosensitive drum through the on-off mode of power from the image forming device.

Description

Technical Field

[0001] The present application relates to the field of electronic imaging technology, and in particular to a developing box. Background Art

[0002] A developer cartridge is a detachable component widely used in image forming devices. It includes a developing roller. Image forming devices typically have four developer cartridges, one for each of the four photosensitive drums. Each cartridge contains a different color of developer. The developing roller contacts the photosensitive drum and transfers toner to the drum, enabling the image forming device to utilize various toner colors for better imaging, meeting a wider range of user printing needs. To prevent damage to the developing roller or drum due to prolonged contact, the developing roller is separated from the drum when the developing cartridge is not in use. Therefore, a separator is provided on the developing cartridge to receive the separating force applied by the image forming device, disengaging the developing roller from the drum and ensuring image quality. However, the driving end (first end) of the developing cartridge is already complex due to the presence of a transmission assembly. Adding a separator to receive the separating force further complicates the driving end structure, hindering the miniaturization of the developing cartridge. Furthermore, the multiple components are prone to interference, reducing the operating stability of the developing cartridge. Utility Model Content

[0003] The technical problem to be solved by this application is to provide a separation structure with a simple structure.

[0004] A developing cartridge can be combined with a drum assembly to form a process cartridge, the developing cartridge can be detachably mounted on an image forming device, and the drum assembly includes a photosensitive drum and a first abutting portion;

[0005] The developer cartridge includes:

[0006] A box body is used to store developer, the box body having a first end and a second end oppositely arranged in a first direction;

[0007] A developing roller is rotatably disposed on the cartridge body about a first direction; the developing roller comprises a first portion and a second portion, the first portion being closer to the first end than the second portion;

[0008] a driving portion configured to receive power outputted by the image forming device and rotate; and

[0009] an abutment member disposed at the first end and capable of abutting against the first abutment portion, wherein at least a portion of the abutment member is movable relative to the cartridge body, thereby receiving a second reaction force that causes the first portion of the developing roller to approach the photosensitive drum or to move the first portion of the developing roller away from the photosensitive drum;

[0010] The developing cartridge is configured such that when the driving portion receives power output from the image forming apparatus and rotates, the first portion of the developing roller moves to a position in contact with the photosensitive drum.

[0011] The utility model drives the developing roller and the photosensitive drum to contact each other through the rotation of the driving part at the first end of the developing box, and realizes the contact or separation of the first part of the developing roller and the photosensitive drum by the on-off mode of the power from the image forming device. Compared with the separating parts in the prior art, its structure is simpler and can improve the stability of the contact or separation of the developing roller and the photosensitive drum.

[0012] In some embodiments, the abutment is configured to be moved to a position abutting the first abutment under the drive of the driving portion, thereby receiving a second reaction force from the first abutment so that the first portion of the developing roller moves to a position in contact with the photosensitive drum.

[0013] In some embodiments, the developing cartridge further includes a third idler wheel, which receives a driving force from the driving portion and drives the abutting member to rotate to a position abutting against the first abutting portion.

[0014] In some embodiments, the abutment member is coaxially disposed with the driving portion, and the abutment member is rotatable relative to the driving portion about its axis;

[0015] A driving gear is provided on the driving part, and the third idler gear is engaged with the driving gear. Driven by the driving gear, the third idler gear can revolve around the axis of the driving gear and can rotate around its own axis. The revolution of the third idler gear around the driving gear can drive the abutment to rotate to a position where it abuts against the first abutment part.

[0016] In some embodiments, the abutment includes an annular portion rotatably disposed around the driving portion; the abutment also includes an abutment protrusion disposed on the annular portion, the third idler wheel is rotatably disposed on the abutment protrusion, and the abutment protrusion is used to abut against the first abutment portion.

[0017] In some embodiments, the developing cartridge is further provided with a guide portion, which is arc-shaped and includes a first end and a second end. The third idler wheel includes a supported portion. The third idler wheel cooperates with the guide portion via the supported portion, and the guide portion guides and limits the revolution of the third idler wheel around the driving gear.

[0018] When the driving portion drives the third idler wheel to rotate, so that the supported portion moves from the first end portion of the guide portion to the second end portion, the abutment protrusion abuts against the first abutment portion, so that the first part of the developing roller contacts the photosensitive drum. At the same time, the third idler wheel is limited by the second end portion and no longer revolves and stays at the second end portion. The third idler wheel remains engaged with the driving gear and continues to rotate. The abutment protrusion remains in abutment against the first abutment portion, and the first part of the developing roller remains in contact with the photosensitive drum.

[0019] In some embodiments, the developing box also includes a second elastic member, which is used to drive the abutment member to reset when the driving part stops rotating, so that the abutment member is disengaged from the first abutment part, the second reaction force disappears, and the first part of the developing roller is separated from the photosensitive drum.

[0020] In some embodiments, the developing cartridge further comprises a protective cover, the protective cover being provided with a collar portion for supporting the driving portion, the abutment being provided around the collar portion; the protective cover further comprising a limiting portion for preventing the abutment from being separated;

[0021] The second elastic member is a torsion spring, which includes a first connecting end and a second connecting end. The first connecting end is used to abut against the limiting part. A force-bearing buckle is provided on the abutting member. The second connecting end abuts against the force-bearing buckle and can be driven by the force-bearing buckle to rotate with the abutting member and deform to store force. When the driving part stops rotating, the second elastic member is released and drives the abutting member to reset.

[0022] In some embodiments, the abutment member is configured to abut against the first abutment portion to receive a second reaction force, so that the first portion of the developing roller is separated from the photosensitive drum; when the driving portion receives power from the image forming device and rotates, the developing cartridge is acted upon by a torque force generated by the rotation, overcoming the second reaction force, so that the first portion of the developing roller moves to a position in contact with the photosensitive drum;

[0023] The abutting member is an elastic member;

[0024] The first end is also provided with a second pushing member, and the drum assembly is also provided with a second force applying member. The second force applying member abuts against the second pushing member to apply a pushing force to the developing box so that the first part of the developing roller approaches the photosensitive drum.

[0025] In some embodiments, the second end is further provided with a separating member, a first elastic member and a first pushing member, and the drum assembly is further provided with a second abutting portion and a first force applying member;

[0026] The first force applying member applies an urging force to the first urging member so that the second portion of the developing roller contacts the photosensitive drum;

[0027] The separating member is configured to receive a separating force from the image forming device and move in a translational manner relative to the cartridge body, thereby abutting against the second abutting portion. The second abutting portion applies a first reaction force to the separating member, and the first reaction force overcomes the urging force, so that the second portion of the developing roller moves to a position separated from the photosensitive drum.

[0028] When the separation force disappears, the first elastic member is used to drive the separation member to reset so as to disengage from the second abutment portion, the first reaction force disappears, and the pushing force causes the second portion of the developing roller to move to a position in contact with the photosensitive drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a structural schematic diagram of the developer cartridge being mounted to the drum assembly in the first embodiment;

[0030] Figure 2 is a structural schematic diagram of the drum assembly in Example 1;

[0031] Figure 3 1 is a schematic structural diagram of the developing cartridge in Example 1;

[0032] Figure 4 is an exploded view of the second end of the developing cartridge in Example 1;

[0033] Figure 5 is a cross-sectional view of the developing cartridge in the first embodiment when it is mounted to the drum assembly and does not receive a separation force;

[0034] Figure 6 is a cross-sectional view of the developing cartridge mounted to the drum assembly to receive the separation force in the first embodiment;

[0035] Figure 7 1 is a schematic structural diagram of the developing cartridge transmission assembly in Example 1;

[0036] Figure 8 is an exploded view of the first end of the developing cartridge in Example 1;

[0037] Figure 9 is a schematic structural diagram of the protective cover in Example 1;

[0038] Figure 10 This is a schematic structural diagram of the cooperation between the force-bearing component and the driving part in the first embodiment;

[0039] Figure 11 is a cross-sectional view of the developing cartridge in the first embodiment when it is mounted to the drum assembly and is not receiving power;

[0040] Figure 12 is a cross-sectional view of the developing cartridge mounted to the drum assembly to receive power in the first embodiment;

[0041] Figure 13 It is a partial structural diagram of the middle drum assembly in the second embodiment;

[0042] Figure 14 is a schematic structural diagram of the protective cover in the second embodiment;

[0043] Figure 15 is a cross-sectional view of the developing cartridge in the second embodiment when mounted to the drum assembly and not receiving power;

[0044] Figure 16 It is a cross-sectional view of the developing box installed on the drum assembly to receive power in Example 2.

[0045] In the picture:

[0046] 1. Developing cartridge; 10. Cartridge body; 11. First end; 12. Second end; 13. Third end; 14. Fourth end; 15. Fifth end; 109. Screw; 111. Protective cover; 112. First guide member; 113. Storage medium; 114. First bracket; 115. Collar; 116. Limiting member; 117. Guide member; 118. Second pushing member; 119. First bearing; 121. Second bearing; 122. First pushing member; 123. Second guide member; 131. Developing roller; 132. Powder knife; 151. Friction member; 31. Second bracket; 311. Mounting member; 312. Connecting column; 32. Separating member; 321. Force-bearing member; 322. Force-applying member; Connecting 40. Driving part; 401. Power receiving part; 402. Large diameter driving gear; 403. Small diameter driving gear; 41. Developing gear; 42. Powder feeding gear; 43. First idler; 44. Second idler; 45. Stirring gear; 46. Third idler; 461. Supported part; 47. Abutment; 471. Abutment protrusion; 472. Force buckle; 48. First elastic part; 481. First connecting end; 482. Second connecting end; 2. Drum assembly; 21. First side wall; 211. First abutment; 212. Second force applying member; 22. Second side wall; 221. Second abutment; 222. First force applying member; 23. Photosensitive drum; 91. Separation force output member. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0048] In the description of this application, unless otherwise specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0049] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also indirectly connected to the other element "on" or "under" through an intermediate element.

[0050] The present application will be further described in detail below with reference to the accompanying drawings.

[0051] In the following descriptions of directions, perpendicular to Figure 1 When viewed from the center of the paper, Figure 1 The left side of the middle paper is left, Figure 1 The right side of the middle paper is right, Figure 1 The upper side of the paper is the top. Figure 1 The lower side of the middle paper is the bottom. Figure 1 The near side of the middle paper is the front, Figure 1 The far side of the middle paper is the back. The left-right direction is an embodiment of the first direction, the front-back direction is an embodiment of the second direction, and the up-down direction is an embodiment of the third direction.

[0052] Example 1:

[0053] like Figures 1-12 As shown, this embodiment provides a developing cartridge 1, which is detachably mounted on a drum assembly 2 of an image forming device, and a separation output member 91 is provided on the image forming device. The drum assembly 2 is used to carry the developing cartridge 1, see Figure 2 The drum assembly 2 includes a first side wall 21, a second side wall 22, and a photosensitive drum 23. The photosensitive drum 23 is rotatably supported by the first side wall 21 and the second side wall 22. The photosensitive drum 23 receives the developer provided by the developer cartridge 1 to form an electrostatic latent image. A first abutting portion 211 is provided on the first side wall 21, and a second abutting portion 221 is provided on the second side wall 22. The drum assembly also includes a first force applying member 222, which is disposed near the second side wall 22. The first force applying member 222 is connected to the elastic member and is movable relative to the photosensitive drum 23.

[0054] like Figure 3-Figure 12 As shown in the figure, the developing box 1 includes a box body 10, a developing assembly, a transmission assembly, a separating member 32 and an identification assembly.

[0055] The box body 10 has a chamber for accommodating developer. The box body 10 has a first end 11 and a second end 12 disposed opposite each other in a first direction. The box body 10 has a third end 13 and a fourth end 14 disposed opposite each other in a second direction. The box body 10 has a fifth end 15 and a sixth end disposed opposite each other in a third direction. The box body 10 is provided with a friction portion 151 having a plurality of ribs extending in the first direction. The friction portion 151 is configured to facilitate a user's lifting of the developer cartridge 1. A transmission assembly is located at the first end 11 of the box body 10 and is configured to receive power output by the image forming device to drive the developing assembly in the developer cartridge 1. The developer cartridge 1 is provided with a plurality of screws 109 that securely connect the remaining components of the developer cartridge 1 to the box body 10.

[0056] like Figure 3 and Figure 8 As shown, the identification component is located at the first end 11 of the cartridge body 10. In this embodiment, the identification component is specifically a storage medium 113. The storage medium 113 is used to store information about the developer cartridge 1. When the developer cartridge 1 is installed in an image forming device, the storage medium 113 transmits the information to the image forming device, allowing the developer cartridge 1 to be identified by the image forming device. The storage medium 113 includes an electrical contact surface formed integrally therewith or assembled separately. The electrical contact surface contacts an electrical contact pin in the image forming device, allowing the information in the storage medium 113 to be transmitted to the image forming device.

[0057] A first bracket 114 is fixedly disposed at the first end 11. The first bracket 114 is first snap-fitted to the protective cover 111 and then further secured to the protective cover 111 via screws 109. This allows the first bracket 114 to be indirectly secured to the housing 10. In some embodiments, the first bracket 114 may be directly secured to the housing 10. The storage medium 113 is mounted on the first bracket 114. Neither the storage medium 113 nor the first bracket 114 can move relative to the housing 10. In some embodiments, the storage medium 113 and the first bracket 114 can move relative to the housing 10.

[0058] like Figure 3As shown, the developing assembly includes a developing roller 131, a powder feed roller (not shown), and a stirring frame (not shown). The developing roller 131, stirring frame, and powder feed roller 13 are all rotatably mounted within the accommodating chamber between the first end 11 and the second end 12. The rotational axes of the developing roller 131, stirring frame, and powder feed roller all extend in a first direction. The powder feed roller is positioned adjacent to the developing roller 131, and in a second direction, the developing roller 131 is closer to the third end 13 of the cartridge body 1 than the powder feed roller. The stirring frame is used to stir the developer within the developing chamber, creating friction and preventing clumping. The developing roller 131 is configured to contact the photosensitive drum 23 to transfer the developer to the drum. The developing assembly also includes a powder discharge knife 132, positioned adjacent to the developing roller 131 and extending in the first direction. The powder discharge knife 132 is configured to contact the developing roller 131 to control the thickness of the developer layer on the developing roller 131. The adsorption portion of the developing roller 131 that adsorbs the developer contacts the photosensitive drum 23 to transfer the developer. The adsorption portion includes a first part and a second part in a first direction. The first part and the second part are connected. The first part is closer to the first end 11 and the second part is closer to the second end 12.

[0059] like Figure 4 As shown, a second bearing 121 is provided at the second end 12. The second bearing 121 rotatably supports the developing roller 131 and the powder feeding roller located at one end of the second end 12. A first pushing member 122 is provided on the second bearing 121. The first pushing member 122 is abutted by the first force applying member 222 on the drum assembly 2 to receive the pushing force applied by the drum assembly 2 to ensure stable contact between the developing roller 131 and the photosensitive drum 23. In this embodiment, the second bearing 121 is made of a conductive material. The first pushing member 122 serves as an electrical receiving portion that contacts the electrodes on the drum assembly 2 to receive the voltage output by the image forming device and transmits the voltage to the developing roller 131 and the powder feeding roller 132, so that the developing roller 131 and the powder feeding roller are charged to absorb the developer. In other embodiments, to save the production cost of the developer cartridge 1, the second bearing 121 and the electrical receiving portion can be provided separately, and the voltage can be transmitted to the developing roller 131 and the powder feeding roller via a conductive member such as an iron sheet. A second guide 123 is further provided at the second end 12 . When the developing cartridge 1 is installed on the drum assembly 2 , the second guide 123 serves as a guide, so that the developing cartridge 1 is smoothly installed on the drum assembly 2 .

[0060] like Figure 4 As shown, a second bracket 31 is further provided at the second end 12. The second bracket 31 is detachably fixed to the cartridge body 10 via screws 109. A locking portion (not shown) is provided at the rear end of the second bracket 31. The locking portion locks the developer cartridge 1 to the drum assembly 2 to prevent it from detaching. A mounting portion 311 is provided on the second bracket 31. The mounting portion 311 is in the form of a hole in the third direction, and a guide rail structure is disposed therein. A connecting post 312 is also provided adjacent to the mounting portion 311, extending in the third direction.

[0061] like Figure 4-Figure 6 As shown, the separator 32 is movably mounted at the second end 12, and the separator 32 is movably supported by the second bracket 31. Further, the separator 32 is movably mounted at the mounting portion 311. The separator 32 includes a force-bearing portion 321 and a force-applying portion 322. The force-bearing portion 321 and the force-applying portion 322 are respectively located at the two ends of the separator 32. The force-bearing portion 321 includes a force-bearing surface, which is an inclined surface or an arc surface. In this embodiment, it is preferably an inclined surface, and the extension direction of the force-bearing surface intersects with the third direction. The force-applying portion 322 includes a force-applying surface, which is an inclined surface or an arc surface. In this embodiment, it is preferably an inclined surface, and the extension direction of the force-applying surface intersects with the third direction. The separator 32 also includes a protruding connecting portion 323. The connecting portion 323 cooperates with the guide rail structure in the mounting portion 311 so that the separator 32 can move relative to the second bracket 31 without being separated from the second bracket 31. A first elastic member 33 is further provided at the second end 12 . The first elastic member 33 is preferably a compression spring. One end of the first elastic member 33 abuts against the separator 32 , and the other end is connected to the connecting column 312 . The first elastic member 33 can be compressed and deformed by the separator 32 .

[0062] like Figure 5 As shown, when the developing box 1 is installed to the drum assembly 2, the two are installed together in the image forming device. When the image forming device does not issue a separation instruction, the first pushing member 122 receives the pushing force applied by the first force member 222 so that the second part of the developing roller 131 maintains contact with the photosensitive drum 23.

[0063] like Figure 6 As shown, when the image forming device issues a separation instruction, the separation force output member 91 of the image forming device abuts against the force-bearing portion 321 of the separation member 32, and the separation member 32 receives the separation force and moves relative to the box body 10. The separation member 32 moves downward approximately in the third direction (the third direction is approximately Figure 6 The first elastic member 33 is compressed, the force-bearing portion 322 abuts against the second abutting portion 221, and the second abutting portion 221 applies a first reaction force to the separator 32. Due to the presence of the force-applying surface as an inclined surface or an arc surface, the downward movement of the separator 32 is converted into a backward movement in the second direction (the second direction is approximately Figure 6 The second end 12 of the cartridge body 10 overcomes the urging force and moves away from the photosensitive drum 23, causing the second portion of the developing roller 131 to break contact with the photosensitive drum. After the separator 32 loses contact with the separating force output member 91, the second end 12 moves toward the photosensitive drum 23 under the action of the urging force. The separator 32 moves in the opposite direction under the action of the urging force and the elastic restoring force of the first elastic member 33 to reset, and the second portion of the developing roller 131 contacts the photosensitive drum 23 again.

[0064] like Figure 7 and Figure 8 As shown, the transmission assembly is arranged at the first end 11 of the box body 10, and the transmission assembly includes a driving part 40, and the driving part 40 includes a power receiving part 401 and a driving gear. The driving gear includes a large-diameter driving gear 402 and a small-diameter driving gear 403. The three can be integrally formed or combined. In the first direction, the large-diameter driving gear 402, the small-diameter driving gear 403 and the power receiving part 401 are successively away from the first end 11. The power receiving part 401 is used to receive the power output by the image forming device, thereby driving the driving part 40 to rotate.

[0065] The transmission assembly also includes a developing gear 41, a powder feed gear 42, a first idler gear 43, a second idler gear 44, and a stirring gear 45. The powder feed gear 42 meshes with the drive gear 402 to receive power and rotate. The first idler gear 43 meshes with both the large-diameter drive gear 402 and the developing gear 41 to transmit power to the developing gear 41. The second idler gear 44 meshes with both the large-diameter drive gear 402 and the stirring gear 45 to transmit power to the stirring gear 45. In this embodiment, the second idler gear 44 is preferably a two-stage gear to reduce the rotation speed of the stirring gear 45. In other embodiments, the stirring gear 45 can mesh directly with the large-diameter drive gear 402. The developing gear 41 is fixedly mounted to the end of the developing roller 131 located at the first end 11 through a D-shaped opening and drives the developing roller 131 in rotation. The powder feed gear 42 is fixedly mounted to the end of the powder feed roller located at the first end 11 through a D-shaped opening and drives the powder feed roller in rotation. The stirring gear 45 is mounted to the end of the stirring frame 134 located at the first end 11 and drives the stirring frame 134 in rotation. This embodiment does not limit the number of gears and the meshing relationship of the transmission assembly, and can be set according to actual needs.

[0066] A first bearing 109 is also provided at the first end 11, and the first bearing 109 is used to support the developing roller 131 and the powder feeding roller located at one end of the first end 11. Preferably, a plurality of support columns are provided on the first bearing 109, and the plurality of support columns can rotatably support the driving part 40 and the remaining gears.

[0067] like Figure 8 and Figure 9As shown, a protective cover 111 is removably fixed to the first end 11 of the housing 10 via screws 109. The protective cover 111 covers at least a portion of the transmission assembly and serves to protect the transmission assembly. A first guide 112 is provided on the protective cover 111. The first guide 112 and the second guide 123 function similarly, guiding the installation of the developer cartridge 1. The protective cover 111 also includes a collar portion 115, a stopper 116, and a guide portion 117. The collar portion 115 is cylindrical and extends in a first direction. The collar portion 115 protects the drive unit 40. The through hole in the collar portion 115 exposes the power receiving unit 401, allowing the power receiving unit 401 to receive external power. The stopper 116 is disposed adjacent to the collar portion 115 and is in the form of an elastic snap-fit ​​protruding in the first direction. The guide portion 117 includes a first end portion 1171 and a second end portion 1172 . The guide portion 117 is in the shape of an arcuate groove extending from the first end portion 1171 to the second end portion 1172 .

[0068] like Figure 7 、 Figure 8 and 10 As shown, the developer cartridge 1 further includes a force-bearing assembly, which is located at the first end 11. The force-bearing assembly can move according to the rotation of the driving portion 40, and is used to achieve contact and separation between the first portion of the developing roller 131 and the photosensitive drum 23. The force-bearing assembly includes a third idler gear 46 and an abutment member 47. The third idler gear 46 is engaged with the driving gear. In this embodiment, the third idler gear 46 is specifically engaged with the small-diameter driving gear 403. The third idler gear 46 can rotate along with the small-diameter driving gear 403. Specifically, the third idler gear 46 not only revolves around the axis of the small-diameter driving gear 403, but also rotates around its own axis. The direction of rotation of the third idler gear 46 revolving around the axis of the small-diameter driving gear 403 is the same as the direction of rotation of the driving portion 40. The third idler gear 46 includes a supported portion 461 (see Figure 7), the supported portion 461 is preferably a cylindrical rod extending in the first direction. One end of the supported portion 461 in the first direction is inserted into the guide portion 117. The rotation trajectory of the third idler gear 46 orbiting around the axis of the small-diameter drive gear 403 is the same as the arc-shaped extension trajectory of the guide portion 117. When the third idler gear 46 rotates, it moves relative to the guide portion 117. The abutment member 47 includes an annular portion, which is rotatably supported by the collar portion 115 of the protective cover 111 and is limited by the limiting portion 116 to prevent the abutment member 47 from disengaging. The abutment member 47 also includes an abutment protrusion 471 that protrudes radially along the annular portion. A circular hole portion 4711 is provided on the abutment protrusion 471 along the first direction. The other end of the supported portion 461 in the first direction is inserted into the circular hole portion 4711, so that the third idler 46 is connected to the abutment member 47. The third idler 46 is supported by the abutment member 47 so as to rotate around its own axis. At the same time, the third idler 46 revolves around the axis of the small-diameter drive gear 403, which can drive the abutment member 47 to rotate around its own axis, thereby moving relative to the box body 10. The third idler 46 and the abutment member 47 have both relative motion and joint motion. The abutment protrusion 471 contacts the drum assembly 2. For further information, see Figure 12 The abutting protrusion 471 abuts against the first abutting portion 211, and the first abutting portion 211 applies a second reaction force to the abutting member 47. Furthermore, the abutting surface on the abutting protrusion 471 abuts against the first abutting portion 211. The abutting surface is preferably an arc surface to reduce the friction between the two. Furthermore, an elastic portion can be provided on the abutting surface, and the elastic portion contacts the first abutting portion 211. The abutting member 47 also includes a force-bearing buckle 472 protruding radially along the annular portion.

[0069] The force-bearing component also includes a second elastic member 48, which is preferably a torsion spring. The second elastic member 48 is supported by the protective cover 111. The first elastic member 48 includes a first connecting end 481 and a second connecting end 482. The first connecting end 481 abuts against the limiting portion 116, and the second connecting end 482 abuts against the force-bearing buckle 472, and can be driven by the force-bearing buckle 472 to move with the abutting member 47. When the abutting member 47 moves with the third idler wheel 46, the second elastic member 48 is deformed and accumulates elastic potential energy.

[0070] like Figure 11As shown, when the developing cartridge 1 is mounted to the drum assembly 2, and the two are installed together in the image forming device, when the driving unit 40 is not receiving power output by the image forming device, the first portion of the developing roller 131 is not in contact with the photosensitive drum 23, the third idler wheel 46 is located at or near the first end 1171, and the abutting member 47 is not in contact with the first abutting portion 211. When the driving unit 40 receives power output by the image forming device and rotates, the third idler wheel 46 rotates with the driving unit 40 and approaches the second end 1172 from the first end 1171. The abutting member 47 rotates with the third idler wheel 46, and the second elastic member 48 is elastically deformed.

[0071] See Figure 12 When the third idler gear 46 rotates to the second end 1172, the abutting protrusion 471 of the abutting member 47 abuts the first abutting portion 211. The first abutting portion 211 applies a second reaction force to the abutting member 47. The second reaction force is directed toward the photosensitive drum 23. The abutting member 47 transmits the second reaction force to the first end 11 of the cartridge body 10, causing the cartridge body 10 to tend to move toward the photosensitive drum 23, and the first portion of the developing roller 131 contacts the photosensitive drum 23. At the same time, the third idler gear 46 remains meshed with the small-diameter drive gear 403 at the second end 1172 and continues to rotate. The third idler gear 46 rotates relative to the abutting member 47, causing the abutting member 47 to remain in a position of abutting the first abutting portion 211.

[0072] When the image forming device issues a separation command, the image forming device stops outputting power to the driving unit 40, causing the driving unit 40 to stop rotating, thereby causing the third idler gear 46 to stop rotating. The second elastic member 48 releases its elastic force and applies the elastic force to the abutting member 47, causing the abutting member 47 to drive the third idler gear 46 to rotate in the opposite direction. The third idler gear 46 rotates from the second end 1172 to the first end 1171, and the abutting member 47 disengages from the first abutting portion 211. The first end 11 of the cartridge body 10 loses the second reaction force, causing the first portion of the developing roller 131 to separate from the photosensitive drum 23. The separating member 32 receives the separating force, causing the second portion of the developing roller 131 to separate from the photosensitive drum 23. That is, when the image forming device issues a separation command, the developing roller 131 is completely separated from the photosensitive drum 23.

[0073] When the driving portion 40 contacts the power of the image forming device again, the third idler wheel 46 drives the abutment member 46 to move to the abutment position with the first abutment portion 211 again, the box body 10 is subjected to the second reaction force, and the first part of the developing roller 131 contacts the photosensitive drum 23.

[0074] The utility model drives the developing roller and the photosensitive drum to contact each other through the rotation of the driving part at the first end of the developing box, and realizes the contact or separation of the first part of the developing roller and the photosensitive drum by the on-off mode of the power from the image forming device. Compared with the separating parts in the prior art, its structure is simpler and can improve the stability of the contact or separation of the developing roller and the photosensitive drum.

[0075] Example 2:

[0076] 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 is that the structure of the force-bearing component in this embodiment is different.

[0077] like Figure 13 As shown, the drum assembly 2 is further provided with a second force applying member 212, which is provided close to the first side wall 21 and has the same function as the first force applying member 222, for applying a pushing force to the developing cartridge 1. The first abutting member 211 is provided close to the photosensitive drum 23.

[0078] like Figure 14 As shown, the developer cartridge 1 is provided with a second forcing member 118, which is provided at the first end 11. In this embodiment, it is preferably provided on the protective cover 111. The second forcing member 118 is abutted by the second force-applying member 212 and receives a forcing force. The direction of the forcing force is generally along the second direction, which is different from the direction of the second reaction force. The first end 11 is also provided with an abutting member 47, which is preferably provided on the protective cover 111 and adjacent to the developing roller 131. The abutting member 47 is an elastic member. In this embodiment, it is a cantilevered elastic member. In other embodiments, it can also be an elastic medium such as a sponge or a compression spring. In this embodiment, the force-bearing component includes the second forcing member 118 and the abutting member 47. In this embodiment, the abutting member 47 and the second forcing member 118 are provided as one body. In other embodiments, the abutting member 47 and the second forcing member 118 can also be provided separately.

[0079] like Figure 15 As shown, when the developer cartridge 1 is installed with the drum assembly 2, at least in the second direction, the abutment 47 is closer to the photosensitive drum 23 than the drive portion 40, and the abutment 47 contacts the first abutment portion 211 of the drum assembly 2. The first abutment portion 211 applies a second reaction force to the abutment 47. The second reaction force causes the first portion of the developing roller 131 to move downward approximately in the third direction, so that the first portion of the developing roller 131 does not contact or cannot stably contact the photosensitive drum 23. The elastic force of the abutment 47 does not need to be too large, as long as a gap is generated between the first portion of the developing roller 131 and the photosensitive drum 23 under the action of the second reaction force. Since the abutment 47 is an elastic member, it abuts against the first abutment portion 211, and at least a portion of the abutment 47 will be elastically deformed, so that the deformed portion moves relative to the cartridge body 10.

[0080] like Figure 16 As shown, the developing box 1 and the drum assembly 2 are installed together in the image forming device, and the driving part 40 receives the power output by the image forming device in the clockwise direction R, so that the driving part 40 rotates in the clockwise direction R. When the driving part 40 receives the power, it will be subjected to a torque force. The torque force causes the developing box 1 to swing or be driven to swing to a certain extent. In the second direction, the part of the box body 10 located behind the driving part 40 swings downward, and the part located in front of the driving part 40 swings upward, that is, the abutment 47 swings upward under the action of the torque force, overcoming the second reaction force. The first part of the developing roller 131 moves upward roughly in the third direction, thereby contacting the photosensitive drum 23.

[0081] It should be noted that even if the abutment member 47 swings upward under the action of the torque force, it will generate a greater elastic force due to elastic compression, causing the second reaction force to increase accordingly. However, as long as the elastic force of the abutment member 47 is set to be small enough, or the torque force is large enough, the torque force can overcome the second reaction force.

[0082] When the image forming device issues a separation instruction, the separation member 32 receives the separation force so that the second part of the developing roller 131 is out of contact with the photosensitive drum, the driving unit 40 does not receive power and stops rotating, the box body 10 loses torque, and under the second reaction force generated by the abutment member 47 and the first abutment portion 211, the first part of the developing roller 131 is out of contact with the photosensitive drum 23.

[0083] Example 3:

[0084] 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 is that the structure of the separating member in this embodiment is different.

[0085] In this embodiment, the pushing member includes a first pushing member 122 located at the second end 12 and a second pushing member located at the first end 11, and the separating member includes a first separating member and a second separating member, and the first separating member and the second separating member do not move relative to the box body 10. The first separating member is fixedly arranged at the first end 11, protruding from the first end 11 in a first direction, and the first separating member is abutted by the rocker on the separating assembly to receive the separating force. The second separating member is fixedly arranged at the second end 12, protruding from the second end 12 in a first direction, and the second separating member is abutted by the separating force output member 91 to receive the separating force. That is, in this embodiment, the separating member receives the separating force applied by the separating force output member 91 and the drum assembly 2, causing the developing box 1 to move away from the photosensitive drum 23, thereby causing the developing roller 131 to separate from the photosensitive drum 23.

[0086] In summary, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of the present application. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present application. The technical scope of the present application is not limited to the contents of the specification. All so-called equivalent changes and modifications of the shape, structure, characteristics and spirit described in the scope of the claims of the present application should be included in the scope of the claims of the present application.

Claims

1. A developing cartridge, which can be combined with a drum assembly to form a process cartridge, and which can be detachably mounted on an image forming device, characterized in that: The drum assembly includes a photosensitive drum and a first abutment portion; The developing box includes: A box body for storing developer, wherein the box body has a first end and a second end oppositely disposed in a first direction; a developing roller rotatably disposed on the cartridge body about a first direction; the developing roller comprising a first portion and a second portion, the first portion being closer to the first end than the second portion; a driving portion configured to receive power outputted by the image forming device and rotate; and an abutment member disposed at the first end and capable of abutting against the first abutment portion, wherein at least a portion of the abutment member is movable relative to the cartridge body, thereby receiving a second reaction force that causes the first portion of the developing roller to approach the photosensitive drum or to move the first portion of the developing roller away from the photosensitive drum; The developing cartridge is configured such that when the driving portion receives power output from the image forming apparatus and rotates, the first portion of the developing roller moves to a position in contact with the photosensitive drum.

2. The developing cartridge according to claim 1, wherein The abutment member is used to move to a position abutting against the first abutment portion under the drive of the driving portion, thereby receiving a second reaction force from the first abutment portion, so that the first part of the developing roller moves to a position contacting the photosensitive drum.

3. The developing cartridge according to claim 2, wherein: The developing box further includes a third idler wheel, which receives a driving force from the driving portion and drives the abutting member to rotate to a position abutting against the first abutting portion.

4. The developing cartridge according to claim 3, wherein: The abutment member is coaxially arranged with the driving portion, and the abutment member is rotatable relative to the driving portion around its axis; The driving portion is provided with a driving gear, and the third idler gear is engaged with the driving gear. Driven by the driving gear, the third idler gear can revolve around the axis of the driving gear and can rotate around its own axis. The revolving motion of the third idler gear around the driving gear can drive the abutment member to rotate to a position abutting against the first abutment portion.

5. The developing cartridge according to claim 4, wherein: The abutment member includes an annular portion rotatably disposed around the driving portion; the abutment member further includes an abutment protrusion disposed on the annular portion, the third idler wheel is rotatably disposed on the abutment protrusion, and the abutment protrusion is used to abut against the first abutment portion.

6. The developing cartridge according to claim 5, wherein: The developing cartridge is further provided with a guide portion, which is arc-shaped and includes a first end and a second end. The third idler wheel includes a supported portion, and the third idler wheel cooperates with the guide portion through the supported portion. The guide portion guides and limits the revolution of the third idler wheel around the driving gear. When the driving portion drives the third idler wheel to rotate so that the supported portion moves from the first end portion of the guide portion to the second end portion, the abutment protrusion abuts against the first abutment portion, thereby causing the first part of the developing roller to contact the photosensitive drum. At the same time, the third idler wheel is limited by the second end portion and no longer revolves and stays at the second end portion. The third idler wheel remains engaged with the driving gear and continues to rotate. The abutment protrusion remains in abutment against the first abutment portion, and the first part of the developing roller remains in contact with the photosensitive drum.

7. The developing cartridge according to any one of claims 2 to 6, wherein: The developing box also includes a second elastic member, which is used to drive the abutment member to reset when the driving part stops rotating, so that the abutment member is disengaged from the first abutment part, the second reaction force disappears, and the first part of the developing roller is separated from the photosensitive drum.

8. The developing cartridge according to claim 7, wherein: The developing box further comprises a protective cover, the protective cover is provided with a collar portion for supporting the driving portion, the abutment member is arranged around the collar portion; the protective cover further comprises a limiting portion, the limiting portion is used to prevent the abutment member from being separated; The second elastic member is a torsion spring, which includes a first connecting end and a second connecting end. The first connecting end is used to abut against the limiting part. A force-bearing buckle is provided on the abutting member. The second connecting end abuts against the force-bearing buckle and can be driven by the force-bearing buckle to rotate with the abutting member and deform to store force. When the driving part stops rotating, the second elastic member is released and drives the abutting member to reset.

9. The developing cartridge according to claim 1, wherein: The abutment member is configured to abut against the first abutment portion to receive a second reaction force, so that the first portion of the developing roller is separated from the photosensitive drum; when the driving portion receives power from the image forming device and rotates, the developing cartridge is acted upon by a torque force generated by the rotation, overcoming the second reaction force, so that the first portion of the developing roller moves to a position in contact with the photosensitive drum; The abutment member is an elastic member; The first end is further provided with a second pushing member, and the drum assembly is further provided with a second force applying member, which abuts against the second pushing member to apply a pushing force to the developing box so that the first part of the developing roller approaches the photosensitive drum.

10. The developing cartridge according to claim 1, wherein The second end is further provided with a separating member, a first elastic member and a first pushing member, and the drum assembly is further provided with a second abutting portion and a first force applying member; The first force applying member applies a pushing force to the first pushing member so that the second portion of the developing roller contacts the photosensitive drum; The separating member is configured to receive a separating force from the image forming device and move in a translational manner relative to the cartridge body, thereby abutting against a second abutting portion, wherein the second abutting portion applies a first reaction force to the separating member, wherein the first reaction force overcomes the urging force, so that the second portion of the developing roller moves to a position separated from the photosensitive drum; When the separation force disappears, the first elastic member is used to drive the separation member to reset so as to disengage from the second abutment portion, the first reaction force disappears, and the pushing force causes the second portion of the developing roller to move to a position in contact with the photosensitive drum.

Images