Developing cartridge, method of operating the same, and image forming apparatus

Abstract

The application provides a developing box, a working method thereof and an imaging device. The developing box is detachably installed in the imaging device. The imaging device is provided with a separation component, a photosensitive drum and a pushed rear wall. The developing box comprises a box body, a developing roller and a separation protrusion. The box body is provided with an accommodating cavity. The accommodating cavity is provided with a powder supply port. The developing roller is rotatably installed at the powder supply port and is in contact with the photosensitive drum. The separation protrusion is located at the bottom of the box body. The separation component can apply a force to the separation protrusion to drive the developing roller to move away from the photosensitive drum. The side of the box body away from the developing roller is provided with an elastic pushing piece. The elastic pushing piece can abut against the pushed rear wall and can slide along the pushed rear wall. The restoring force of the elastic pushing piece forces the box body to move and drives the developing roller to move towards the photosensitive drum. The developing box can avoid plastic deformation of the elastic pushing piece caused by repeated extrusion to a large extent, so that the developing roller cannot be in close contact with the photosensitive drum, and the printing quality is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrophotographic imaging, in particular to a developing cartridge, a working method thereof and an imaging device. BACKGROUND

[0002] The electrophotographic imaging device is a device for forming an image on a printing medium such as paper by using the principle of electrophotography, including a copier, a printer, a fax machine, an all-in-one machine, etc., and generally comprises a main machine and a developing cartridge which is detachably installed in the main machine.

[0003] The developing cartridge comprises a developing roller for supplying toner to an imaging device, a powder feeding stick for feeding the toner to the developing roller, a stirring frame for feeding the toner in a powder chamber to a developing chamber while preventing the toner in the powder chamber from being agglomerated, a powder chamber for storing the toner, a powder discharge blade for controlling the thickness of the toner in the developing roller so that the toner can be uniformly developed, and a separation mechanism provided at both ends and composed of a pressure receiving block and a compression spring, one end of the pressure receiving block being rotatably fixed to the inner side of an end cover and the other end extending downward to the outside of the developing cartridge body and having a hook portion, one end of the compression spring abutting against the side surface of the pressure receiving block and the other end abutting against the end cover.

[0004] When the developing cartridge is installed to the drum frame, the hook portion of the pressure receiving block in the push device abuts against the separation member of the imaging device, and when the separation member moves backward, the first protrusion of the separation member abuts against the hook portion of the separation protrusion to pull the developing cartridge backward so that the developing roller and the photosensitive drum are separated for cleaning the photosensitive drum. When the separation member moves forward, the second protrusion of the separation member abuts against the rear surface of the hook portion and pushes the developing cartridge to move forward, so that the developing roller and the photosensitive drum are in contact for developing operation, at this time, the compression spring is compressed and deformed, and the restoring force is generated.

[0005] In the process that the developing roller and the photosensitive drum are in contact, the compression spring in the separation mechanism of the developing cartridge is in contact and pressed by the pressure receiving block and the second protrusion of the separation member in real time, which not only increases the resistance that the separation member overcomes and increases the power consumption of the imaging device, but also causes the spring to relax due to the long-time and large force pressing, so that the developing roller and the photosensitive drum cannot be in close contact, thereby affecting the printing quality. Furthermore, the separation mechanism has a complex structure, which is not conducive to the production of the developing cartridge. SUMMARY

[0006] The first object of the present application is to provide a developing cartridge which can greatly reduce the force that the separation mechanism of the imaging device receives in the process that the developing roller and the photosensitive drum are separated, and also avoid the plastic deformation of the elastic push member due to the large degree of pressing in the frequent separation process, so that the developing roller cannot be in close contact with the photosensitive drum, thereby affecting the printing quality.

[0007] The second object of the present application is to provide a working method of the above developing cartridge.

[0008] A third object of the present application is to provide an image forming apparatus having the developing cartridge.

[0009] To achieve the above first object, the present application provides a developing cartridge, which is detachably installed in an image forming apparatus, the image forming apparatus being provided with a separation member, a photosensitive drum and a pushed rear wall; the developing cartridge comprising a cartridge body, a developing roller and a separation protrusion, the cartridge body being provided with a containing cavity, the containing cavity being provided with a powder supply port, the developing roller being rotatably installed at the powder supply port and being in contact with the photosensitive drum, the separation protrusion being located at the bottom of the cartridge body, the separation member being capable of applying a force to the separation protrusion to drive the developing roller to move away from the photosensitive drum; the side of the cartridge body away from the developing roller being provided with an elastic pushing member, the elastic pushing member being capable of abutting against the pushed rear wall and being capable of sliding along the pushed rear wall, the restoring force of the elastic pushing member forcing the cartridge body to move and driving the developing roller to move towards the photosensitive drum.

[0010] As can be seen from the above scheme, by providing the elastic pushing member at the side of the cartridge body away from the developing roller, when the separation member in the image forming apparatus applies a force to the separation protrusion after cleaning the photosensitive drum, the elastic pushing member simultaneously applies a force to the cartridge body in the same direction, thereby forcing the cartridge body to reset faster, so that the separation member only needs to apply a smaller force to the separation protrusion to achieve the resetting of the cartridge body, thereby reducing the resistance in the movement of the separation member and the power consumption generated by the image forming apparatus to overcome the resistance, and at the same time, the elastic pushing member can apply a force to the developing roller towards the photosensitive drum, ensuring that the developing roller is in close contact with the photosensitive drum and ensuring the printing quality. In addition, the elastic pushing member can be integrally formed with the cartridge body or connected with the cartridge body by snap connection after injection molding, etc., so that the overall structure of the developing cartridge is simple and the assembly process is simple, which is conducive to improving the production efficiency. In addition, by providing the elastic pushing member, the stress in the separation and contact process of the elastic pushing member and the separation member is reduced, and the relaxation phenomenon of the elastic pushing member after multiple separations is avoided, which affects the printing quality.

[0011] A preferred scheme is that the elastic pushing member comprises a fixed part and a deformation part, the fixed part is fixedly connected with the cartridge body, one end of the deformation part is connected with the fixed part, and the deformation part abuts against the pushed rear wall.

[0012] As can be seen from the above scheme, the fixed part realizes the fixed connection of the elastic pushing member with the cartridge body, and the deformation part realizes the elastic abutment of the elastic pushing member with the bottom wall.

[0013] A further scheme is that the deformation part comprises a connecting segment and an arc segment, the two ends of the connecting segment are connected with the fixed part and the arc segment respectively, the connecting segment forms a movable space with the cartridge body, and the arc segment is curved towards the pushed rear wall and is capable of sliding along the pushed rear wall.

[0014] Therefore, the arc-shaped section can ensure smooth sliding connection between the elastic pushing piece and the pushed rear wall, avoiding interference or unsmooth sliding.

[0015] In a further aspect, the extension direction of the connecting section is inclined from the end far from the arc-shaped section to the end close to the arc-shaped section.

[0016] Therefore, the deformation part can be elastically deformed in the direction in which the separation member moves and in the vertical direction.

[0017] In a preferred aspect, the fixing part includes a positioning cover, a cantilever, and a buckle. The positioning cover is installed at the end of the cartridge body. The fixed end of the cantilever is connected to the positioning cover. The cantilever extends along the outer surface of the cartridge body towards the bottom of the cartridge body. The buckle is arranged at the free end of the cantilever and engages with the rib of the bottom of the cartridge body.

[0018] Therefore, the positioning cover can precisely position the elastic pushing piece, and the buckle can ensure stable connection between the elastic pushing piece and the cartridge body.

[0019] In a preferred aspect, the number of elastic pushing pieces is two or more. The plurality of elastic pushing pieces are arranged along the length direction of the cartridge body. At least one elastic pushing piece is arranged at each end of the cartridge body.

[0020] Therefore, the plurality of elastic pushing pieces can ensure force balance in the length direction of the cartridge body, thereby preventing the cartridge body from tilting and affecting the contact pressure of the developing roller and the photosensitive drum in the length direction, which affects the printing quality.

[0021] In a preferred aspect, the separation protrusion is fixedly connected to the cartridge body.

[0022] Therefore, the separation protrusion is fixed to the cartridge body, thereby further simplifying the structure of the developing cartridge and improving assembly efficiency.

[0023] In a further aspect, the cartridge body includes a powder bin and an end cover. The accommodation cavity is arranged on the powder bin. The end cover is detachably installed at the end of the powder bin. The separation protrusion is fixedly connected to the powder bin or the end cover.

[0024] Therefore, the separation protrusion can be fixedly connected to the powder bin or the end cover. The fixed connection can be formed integrally, which not only improves the stability of the connection between the separation protrusion and the cartridge body, but also simplifies the assembly process.

[0025] To achieve the above-mentioned second object, the application provides a working method of the developing cartridge, the developing cartridge is detachably installed in the image forming device, the image forming device is provided with a separation member, a photosensitive drum and a pushed rear wall, the pushed rear wall comprises a vertical surface and an inclined surface connected with each other, the inclined surface is arranged in an inclined manner from bottom to top from one end close to the vertical surface to one end far from the vertical surface; the separation member is provided with a first protrusion and a second protrusion arranged at intervals along the moving direction of the separation member; the separation protrusion extends into the first protrusion and the second protrusion; the working method comprises: before cleaning the photosensitive drum, the separation member moves along the first direction, the first protrusion applies a force to the separation protrusion, the separation protrusion moves and drives the developing roller to move away from the photosensitive drum, and the elastic pushing piece moves from the position abutting against the vertical surface to the position abutting against the inclined surface; after cleaning the photosensitive drum, the separation member moves in the reverse direction of the first direction, the second protrusion applies a force to the separation protrusion, and the elastic pushing piece moves from the position abutting against the inclined surface to the position abutting against the vertical surface.

[0026] To achieve the above-mentioned third object, the application provides an image forming device comprising the developing cartridge. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural diagram of the first perspective of the developing cartridge embodiment of the application.

[0028] Figure 2 is a structural diagram of the second perspective of the developing cartridge embodiment of the application.

[0029] Figure 3 is a structural exploded view of the developing cartridge embodiment of the application.

[0030] Figure 4 is a positional relationship diagram of the developing cartridge, the separation member and the pushed rear wall in the image forming device embodiment of the application.

[0031] Figure 5 is a schematic diagram of the developing cartridge in the initial position in the process that the separation member drives the developing roller to move away from the photosensitive drum in the image forming device embodiment of the application.

[0032] Figure 6 is a schematic diagram of the elastic pushing piece close to the inclined surface in the process that the separation member drives the developing roller to move away from the photosensitive drum in the image forming device embodiment of the application.

[0033] Figure 7 is a schematic diagram of the separation member moving to the rear limit position in the process that the separation member drives the developing roller to move away from the photosensitive drum in the image forming device embodiment of the application.

[0034] Figure 8 is a schematic diagram of the developing cartridge in the initial position in the process that the separation member drives the developing roller to move close to the photosensitive drum in the image forming device embodiment of the application.

[0035] Figure 9 is a schematic view of the elastic push member sliding off the inclined surface and abutting against the vertical surface in the process of driving the developing roller to approach the photosensitive drum by the separating member in the imaging device embodiment of the present application.

[0036] Figure 10 is a schematic view of the developing cartridge in the final position in the process of driving the developing roller to approach the photosensitive drum by the separating member in the imaging device embodiment of the present application.

[0037] The present application is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0038] Referring to Figures 1 to 5 , the imaging device in the embodiment includes a cartridge compartment and a developing cartridge 2 detachably installed in the cartridge compartment. The cartridge compartment is further provided with a separating member 11, a photosensitive drum 12, a cleaning blade (not shown) and a pushed rear wall 13, the pushed rear wall 13 includes a vertical surface 131 and an inclined surface 132 connected together, the inclined surface 132 is arranged obliquely from bottom to top from one end close to the vertical surface 131 to one end away from the vertical surface 131. The separating member 11 is provided with a first protrusion 111 and a second protrusion 112 arranged at intervals along the moving direction of the separating member 11.

[0039] The developing cartridge 2 includes a cartridge body 3, a developing roller 4, separating protrusions 5 and elastic push members 6. The cartridge body 3 includes a powder compartment 31 and an end cover 32, the powder compartment 31 is provided with a containing cavity, the containing cavity is provided with a powder supply port 311, the developing roller 4 is rotatably installed at the powder supply port 311, the end cover 32 is detachably installed at the end of the powder compartment 31, the number of the separating protrusions 5 is two, and the two separating protrusions 5 are both located at the bottom of the cartridge body 3 and integrally injection molded with the powder compartment 31. The two separating protrusions 5 are respectively arranged at both ends of the length direction of the cartridge body 3, the separating protrusions 5 are both hook-shaped, and the openings of the hook-shaped separating protrusions 5 are towards the side of the developing roller 4, the hook-shaped separating protrusions 5 can improve the stability of the cooperation between the separating protrusions 5 and the first protrusion 111, and prevent the two from being separated during the movement of the separating member 11.

[0040] After the developing cartridge 2 is installed in the imaging device, the developing roller 4 is in contact with the photosensitive drum 12, the separating protrusions 5 extend into the first protrusion 111 and the second protrusion 112, and the separating member 11 can apply a force to the separating protrusions 5 to drive the developing roller 4 to move away from the photosensitive drum 12.

[0041] The number of the elastic push members 6 is two, the two elastic push members 6 are respectively arranged at both ends of the length direction of the cartridge body 3, and the two elastic push members 6 are both located at the side of the cartridge body 3 away from the developing roller 4, the elastic push members 6 can abut against and slide along the pushed rear wall 13, and the restoring force of the elastic push members 6 forces the cartridge body 3 to move and drives the developing roller 4 to move towards the photosensitive drum 12.

[0042] The elastic pushing piece 6 comprises a fixed part 61 and a deformation part 62, the fixed part 61 is fixedly connected with the box body 3, one end of the deformation part 62 is connected with the fixed part 61, and the deformation part 62 abuts against the pushed rear wall 13.

[0043] The fixed part 61 comprises a positioning cover 611, a cantilever 612 and a buckle 613, the positioning cover 611 is installed at the end of the box body 3, the fixed end of the cantilever 612 is connected with the positioning cover 611, the cantilever 612 extends along the outer surface of the box body 3 towards the bottom of the box body 3, and the buckle 613 is arranged at the free end of the cantilever 612 and is clamped with the rib 33 at the bottom of the box body 3.

[0044] The deformation part 62 comprises a connecting segment 621 and an arc segment 622, two ends of the connecting segment 621 are respectively connected with the fixed part 61 and the arc segment 622, an activity space 623 is formed between the connecting segment 621 and the box body 3, from the end far away from the arc segment 622 to the end close to the arc segment 622, the extension direction of the connecting segment 621 is obliquely arranged from bottom to top, the arc segment 622 is curved towards the pushed rear wall 13 and can slide along the pushed rear wall 13. The arc segment 622 can realize that the elastic pushing piece 6 and the pushed rear wall 13 can smoothly slide with each other, and avoid the problems of interference or unsmooth sliding.

[0045] The working method comprises the following steps.

[0046] Referring to Figures 5 to 7 , Figures 5 to 7Fig. 2 is a schematic view of the position of the elastic push member 6 relative to the pushed rear wall 13 during the process of driving the separation member 11 to gradually move the developing roller 4 away from the photosensitive drum 12. Before cleaning the photosensitive drum 12, the separation member 11 moves in the first direction (the direction indicated by the arrow X), the first protrusion 111 contacts and exerts a force on the separation protrusion 5, the separation protrusion 5 moves and drives the developing roller 4 to move away from the photosensitive drum 12, the elastic push member 6 abuts against the vertical surface 131, the elastic push member 6 is elastically deformed under the force and the arc-shaped section 622 of the elastic push member 6 slides upward along the vertical surface 131, because the connecting section 621 of the elastic push member 6 is inclined, the arc-shaped section 622 of the elastic push member 6 will have an upward component force F1 under the force, when the elastic push member 6 is elastically deformed more, the pushing force F of the elastic push member 6 against the pushed rear wall 13 of the image forming apparatus increases, the upward component force F1 of the pushing force F increases, when F1 is greater than the friction force f and the gravity G that hinder the elastic push member 6 from sliding along the pushed surface, the arc-shaped section 622 is separated from the vertical surface 131 and slides upward along the inclined surface 132 on the pushed rear wall 13, until the separation member 11 moves to the limit position, at this time, because the pressing force of the inclined surface 132 against the elastic push member 6 is smaller relative to the vertical surface 131, the elastic push member 6 will not be subjected to a large pressure, at the same time, at this time, the separation member 11 has reached the limit position at the rear side, the developing roller 4 is separated from the photosensitive drum 12, the image forming apparatus can drive the photosensitive drum 12 to rotate, and the cleaning blade can clean the surface of the photosensitive drum 12, this cleaning method is a prior art and will not be described here.

[0047] Referring to Figures 8 to 10 , Figures 8 to 10 Fig. 3 is a schematic view of the position of the elastic push member 6 relative to the pushed rear wall 13 during the process of driving the separation member 11 to gradually move the developing roller 4 away from the photosensitive drum 12. After cleaning the photosensitive drum 12, the separation member 11 moves in the reverse direction of the first direction (the direction indicated by the arrow X'), the second protrusion 112 exerts a force on the separation protrusion 5, the separation protrusion 5 moves and drives the developing roller 4 to move to the limit position at the front side, at this time, the separation member 11 stops moving forward, and at this time, because the arc-shaped section 622 of the elastic push member 6 abuts against the vertical surface 131 on the pushed rear wall 13, when the arc-shaped section 622 slides from the inclined surface 132 to the vertical surface 131, the pressing force of the pushed rear wall 13 against the elastic push member 6 increases, the elastic restoring force will give the cartridge 3 a forward pushing force, at the same time, during the process of the elastic push member 6 moving from the position abutting against the inclined surface 132 to the position abutting against the vertical surface 131, because the cartridge 3 will be subjected to an inclined downward force, the elastic push member 6 will have a forward inertia when it slides downward along the inclined surface 132, under the simultaneous action of the inertial force and the elastic restoring force, the developing cartridge 2 continues to move forward by a small distance, so that the developing roller 4 is in close contact with the photosensitive drum 12, and at this time, as described above, the separation protrusion 5 is in the limit position at the front side, the separation protrusion 5 cannot move forward, and the developing roller 4 cannot move away from the photosensitive drum 12, so that the developing roller 4 and the photosensitive drum 12 are in close contact, and the developing cartridge 2 can be driven to rotate together with the photosensitive drum 12, and the cleaning blade can clean the surface of the photosensitive drum 12, this cleaning method is a prior art and will not be described here. Figure 10As shown, the separation protrusion 5 is between the first protrusion 111 and the second protrusion 112, and neither the first protrusion 111 nor the second protrusion 112 is in contact with the separation protrusion 5.

[0048] In this way, the contact and separation of the developing roller 4 of the developing cartridge 2 and the photosensitive drum 12 can greatly reduce the force borne by the separation member 11 in the imaging device during the separation of the developing roller 4 and the photosensitive drum 12. At the same time, the deformation part 62 of the elastic push member 6 is also avoided from being pressed by a large degree of elastic deformation multiple times during frequent separation, so that the internal stress and grain of the material of the deformation part 62 are in an unstable state, some atoms are transferred to a low-energy zone, local elastic strain becomes plastic strain, and the deformation part 62 produces relaxation. Further, the size of the elastic force of the deformation part 62 is affected, so that the developing roller 4 cannot be in close contact with the photosensitive drum 12 as before, thereby affecting the printing quality.

[0049] As can be seen from the above, by arranging the elastic push member on the side of the cartridge body away from the developing roller, when the separation member in the imaging device applies a force to the separation protrusion after cleaning of the photosensitive drum, the elastic push member simultaneously applies a force in the same direction to the cartridge body, thereby forcing the cartridge body to reset faster. Therefore, the separation member only needs to apply a smaller force to the separation protrusion to achieve the resetting of the cartridge body, thereby reducing the resistance during the movement of the separation member and reducing the power consumption of the imaging device. At the same time, the elastic push member can apply a force to the developing roller towards the photosensitive drum, ensuring that the developing roller is in close contact with the photosensitive drum and ensuring the printing quality. In addition, the elastic push member can be integrally formed with the cartridge body or buckled and connected with the cartridge body after injection molding, etc., so that the overall structure of the developing cartridge is simple, the assembly process is simple, and it is conducive to improving the production efficiency.

[0050] In addition, the number of elastic push members can be one, and one elastic push member is located at the middle of the length direction of the cartridge body. The number of elastic push members can also be two or more, and multiple elastic push members are arranged along the length direction of the cartridge body. At least one elastic push member is arranged at each end of the cartridge body. The separation protrusion and the powder bin can be fixedly connected in a buckling or screwing or welding or fusion manner; or the separation protrusion and the end cover can be fixedly connected in a buckling or screwing or welding or fusion manner; or the separation protrusion and the end cover can be integrally injection molded. The separation protrusion can be movably connected with the cartridge body, and the separation protrusion is provided with a reset spring on the side close to the developing roller in the movement direction of the separation member. The two ends of the reset spring are respectively in abutment with the cartridge body and the separation protrusion. The separation protrusion is provided with a limiting part on the side away from the reset spring, and the separation protrusion and the limiting part are limitingly matched in the movement direction of the separation member. The above changes can also achieve the purpose of the present application.

[0051] Finally, it should be noted that the above merely represents the preferred embodiments of the present application and is not intended to limit the present application, and the present application can have various changes and modifications for those skilled in the art, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A developing cartridge detachably installed in an image forming apparatus, the image forming apparatus being provided with a separation member, a photosensitive drum and a pushed rear wall; the developing cartridge comprising a cartridge body, a developing roller and a separation protrusion, the cartridge body being provided with a receiving cavity, the receiving cavity being provided with a powder supply port, the developing roller being rotatably installed at the powder supply port and being in contact with the photosensitive drum, the separation protrusion being located at the bottom of the cartridge body, the separation member being capable of applying a force to the separation protrusion to drive the developing roller to move away from the photosensitive drum; characterized in that: a resilient pushing member is arranged on the side of the cartridge body away from the developing roller, the resilient pushing member being capable of abutting against and sliding along the pushed rear wall, the resilient force of the resilient pushing member forcing the cartridge body to move and the developing roller to move towards the photosensitive drum.

2. The developing cartridge according to claim 1, characterized in that: the resilient pushing member comprises a fixed portion and a deformation portion, the fixed portion being fixedly connected with the cartridge body, one end of the deformation portion being connected with the fixed portion, the deformation portion abutting against the pushed rear wall.

3. The developing cartridge according to claim 2, characterized in that: the deformation portion comprises a connecting segment and an arc-shaped segment, the two ends of the connecting segment being connected with the fixed portion and the arc-shaped segment respectively, the connecting segment and the cartridge body forming a moving space, the arc-shaped segment being curved towards the pushed rear wall and being capable of sliding along the pushed rear wall.

4. The developing cartridge according to claim 3, characterized in that: from the end away from the arc-shaped segment to the end close to the arc-shaped segment, the extending direction of the connecting segment is inclined from bottom to top.

5. The developing cartridge according to any one of claims 2 to 4, characterized in that: the fixed portion comprises a positioning cover, a cantilever and a buckle, the positioning cover being installed at the end of the cartridge body, the fixed end of the cantilever being connected with the positioning cover, the cantilever extending along the outer surface of the cartridge body towards the bottom of the cartridge body, the buckle being arranged at the free end of the cantilever and being engaged with the rib of the bottom of the cartridge body.

6. The developing cartridge according to any one of claims 1 to 4, characterized in that: the number of the resilient pushing members is more than two, the plurality of resilient pushing members being arranged along the length direction of the cartridge body, at least one resilient pushing member being arranged at each end of the cartridge body.

7. The developing cartridge according to any one of claims 1 to 4, characterized in that: the separation protrusion is fixedly connected with the cartridge body.

8. The developing cartridge according to claim 7, characterized in that: the cartridge body comprises a powder tank and an end cover, the receiving cavity being located on the powder tank, the end cover being detachably installed at the end of the powder tank; the separation protrusion is fixedly connected with the powder tank; or the separation protrusion is fixedly connected with the end cover.

9. A working method of a developing cartridge, the developing cartridge being detachably installed in an image forming apparatus, the image forming apparatus being provided with a separation member, a photosensitive drum and a pushed rear wall; The pushed rear wall comprises a vertical surface and an inclined surface connected to each other, and the inclined surface is arranged in an inclined manner from bottom to top from one end close to the vertical surface to the other end away from the vertical surface; The separating member is provided with a first protrusion and a second protrusion arranged at intervals along the moving direction of the separating member; It is characterized in that, The developing cartridge is as claimed in any one of claims 1 to 8, and the separating protrusion extends into the first protrusion and the second protrusion; The working method comprises: Before cleaning the photosensitive drum, the separating member moves along a first direction, the first protrusion applies a force to the separating protrusion, the separating protrusion moves and drives the developing roller to move away from the photosensitive drum, and the elastic pushing member moves from the position abutting against the vertical surface to the position abutting against the inclined surface; After cleaning the photosensitive drum, the separating member moves along the reverse direction of the first direction, the second protrusion applies a force to the separating protrusion, and the elastic pushing member moves from the position abutting against the inclined surface to the position abutting against the vertical surface.

10. An imaging device, characterized by, The developing cartridge as claimed in any one of claims 1 to 8.

Images