Photosensitive drum, drum cartridge, process cartridge and electrophotographic image forming apparatus

Abstract

The utility model provides a photosensitive drum, drum cartridge, process cartridge and electrophotographic imaging equipment, photosensitive drum includes shaft core, first shaft cover, second shaft cover, drum body and coating, first shaft cover is sleeved on the shaft core, second shaft cover is sleeved on the shaft core, the first end of drum body is sleeved on the first shaft cover, the second end of drum body is sleeved on the second shaft cover, and the coating is coated on the first shaft cover and the second shaft cover. The coating coats the peripheral surface of the drum body, the diameter of the middle part of the drum body is greater than that of the end part of the drum body, and a first generatrix of the drum body is an arc line; the overall thickness of the coating is consistent, or the thickness of the end, close to the end of the drum body, of the coating is larger than that of the middle, close to the middle of the drum body, of the coating. The drum box is provided with the photosensitive drum, the processing box is provided with the photosensitive drum or the drum box, the electrophotographic imaging equipment is provided with the processing box, and the photosensitive drum has the advantages of long service life and good environmental protection property.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic photographic imaging, in particular to a photosensitive drum, a drum box provided with the photosensitive drum, a processing box provided with the drum box, and an electronic photographic imaging device provided with the processing box. Background Art

[0002] An electrophotographic imaging device (such as a laser printer) is a device that uses the principles of electrophotography to form an image on an image forming medium (such as paper) through at least the processes of charging, exposure, development, transfer, fixing, and cleaning. The material device for printing consumables used on an electrophotographic imaging device is generally called a processing cartridge.

[0003] The processing box includes a developing roller and a photosensitive drum. When the processing box performs a printing operation, the developing roller will be in close contact with the photosensitive drum, so that the toner on the developing roller can be transferred to the photosensitive drum; and in this process, the developing roller and the photosensitive drum will undergo very slight deformation, so that the force applied to the photosensitive drum or the developing roller near the support end is greater than the force applied away from the support end. In addition, due to the stepped shaft arrangement between the shaft core of the developing roller and the elastic layer of the developing roller, and the fact that in the axial direction of the photosensitive drum, the coating length on the outer peripheral surface of the photosensitive drum is longer than the elastic layer length of the developing roller, when the coating of the photosensitive drum contacts the stepped portion of the developing roller, the coating of the photosensitive drum at the contact point (the contact point is close to the support end) is subjected to a greater force. Therefore, the coating of the photosensitive drum at the contact point wears quickly and is easily damaged, affecting the service life of the photosensitive drum, thereby accelerating the scrapping speed of the processing box, which is not conducive to environmental protection and will also affect the imaging quality of the electronic photographic imaging device. Utility Model Content

[0004] In order to solve the above problems, the first object of the utility model is to provide a photosensitive drum with a long service life and good environmental performance.

[0005] The second object of the utility model is to provide a drum box provided with the above-mentioned photosensitive drum.

[0006] The third object of the utility model is to provide a processing box provided with the above-mentioned photosensitive drum or drum box.

[0007] The fourth object of the utility model is to provide an electronic photographic imaging device provided with the above-mentioned processing box.

[0008] In order to achieve the first purpose of the utility model, the utility model provides a photosensitive drum, including an axis core, a first axis cover, a second axis cover, a drum body and a coating, wherein the first axis cover is sleeved on the axis core, the second axis cover is sleeved on the axis core, the first end of the drum body is sleeved on the first axis cover, the second end of the drum body is sleeved on the second axis cover, and the coating is coated on the outer peripheral surface of the drum body, wherein the middle diameter of the drum body is larger than the end diameter of the drum body, and the first generatrix of the drum body is an arc; the overall thickness of the coating is consistent, or the end thickness of the coating close to the end of the drum body is larger than the middle thickness of the coating close to the middle of the drum body.

[0009] As can be seen from the above, through the design of the drum body, the middle of the drum body's generatrix is ​​slightly convex to the outside of the drum body at both ends, so that the drum body is roughly waist-drum-shaped. At the same time, with the design of consistent overall coating thickness, it can balance and alleviate the situation that when the photosensitive drum contacts and rotates with the developing roller, the photosensitive drum is subjected to large forces at both ends and small forces in the middle due to micro-elastic deformation, so that the wear speed of the ends and the middle of the coating tends to be the same while ensuring close contact between the photosensitive drum and the developing roller, and the wear speed of the coating at the step of the developing roller is reduced; or, with the design of large thickness at the ends of the coating and small thickness in the middle, the thickness of the coating in contact with the step of the developing roller is larger to adapt to the situation of fast wear speed at the ends of the coating, thereby extending the service life of the ends of the coating. Under the coordinated design between the drum body and the coating, the service life of the photosensitive drum and the drum box or processing box equipped with the photosensitive drum can be effectively extended, and the environmental protection of the photosensitive drum and the drum box or processing box equipped with the photosensitive drum can be improved.

[0010] A further solution is that, on the axial cross-section of the photosensitive drum, the height difference between the highest point of the first generatrix and the lowest point of the first generatrix is ​​between 0.03 mm and 0.08 mm.

[0011] As can be seen from the above, this design allows the photosensitive drum to maintain close contact with the developing roller as a whole when the photosensitive drum is in a printing state and undergoes slight elastic deformation. At the same time, in conjunction with the design of the coating, the wear speeds of the ends and the middle of the coating tend to be the same, thereby extending the service life of the coating; or it is beneficial to increase the thickness of the ends of the coating to adapt to the situation where the wear speed at the ends of the coating is faster than the wear speed at the middle of the coating, thereby extending the service life of the coating.

[0012] A further solution is that when the overall thickness of the coating is consistent, the thickness of the coating is between 0.006 mm and 0.05 mm; when the end thickness of the coating is greater than the middle thickness of the coating, the middle thickness is between 0.006 mm and 0.05 mm, and the end thickness is greater than 0.006 mm and less than or equal to 0.13 mm.

[0013] It can be seen from the above that the above design enables the coating to match the drum body and at least meet the conventional loss requirements.

[0014] A further solution is that when the thickness of the coating at the end is greater than the thickness of the coating in the middle, the second generatrix of the coating is a straight line, and the straight line is parallel to the axis core; or when the thickness of the coating at the end is greater than the thickness of the coating in the middle, the diameter of the coating in the middle is greater than the diameter of the coating at the end, and the second generatrix is ​​an arc.

[0015] It can be seen from the above that the above design is conducive to solving the problem of short service life of the coating caused by fast wear rate of the end thickness of the coating and slow wear rate of the middle thickness.

[0016] A further solution is that the coating includes an insulating layer and a photosensitive layer, the insulating layer is coated on the outer peripheral surface of the drum body, and the photosensitive layer is coated on the insulating layer.

[0017] As can be seen from the above, the insulating layer can ensure that the surface of the photosensitive drum can stably store charges to prevent charge leakage; the photosensitive layer is used to respond to light and change its own conductivity to form an electrostatic latent image.

[0018] A further solution is that the coating includes an anti-reflection layer and a protective layer, the anti-reflection layer is coated on the photosensitive layer, and the protective layer is coated on the anti-reflection layer.

[0019] As can be seen from the above, the anti-reflection layer can reduce unnecessary external light reflections, thereby ensuring that the laser or other light source can effectively irradiate the photosensitive layer; the protective layer can protect the photosensitive layer, enhance the wear resistance and oxidation resistance of the coating, and prevent the photosensitive layer from chemical erosion and environmental influences, which is beneficial to further extend the service life of the photosensitive drum.

[0020] A further solution is that a gear is formed on the first shaft cover.

[0021] As can be seen from the above, a gear is molded on the first shaft cover, so that the photosensitive drum can cooperate with the developing roller gear on the developing roller through the gear, so that when the photosensitive drum is in the state of executing a printing job, the developing roller can drive the photosensitive drum to rotate in opposite directions and synchronously through the developing roller gear and the gear on the first shaft cover.

[0022] In order to achieve the second purpose of the utility model, the utility model provides a drum box, including a drum frame, wherein the photosensitive drum is also included, and the photosensitive drum is rotatably mounted on the drum frame.

[0023] As can be seen from the above, the drum box provided with the above-mentioned photosensitive drum has the advantages of long service life and good environmental protection.

[0024] In order to achieve the third purpose of the utility model, the utility model provides a processing box, wherein the processing box includes a developing box and the above-mentioned drum box, the developing box includes a first developing frame and a first developing roller, the first developing roller is rotatably mounted on the first developing frame, the drum frame is movably connected to the first developing frame, and the first developing roller can contact or separate from the photosensitive drum; or the processing box includes a second developing frame, a second developing roller, an end cover assembly and the above-mentioned drum box, the second developing roller is rotatably mounted on the second developing frame, the end cover assembly is respectively connected to the second developing frame and the drum frame, and the second developing roller can contact the photosensitive drum; or the processing box includes a frame, a third developing roller and the above-mentioned photosensitive drum, the third developing roller and the photosensitive drum are both rotatably mounted on the frame, and the third developing roller is in contact with the photosensitive drum.

[0025] As can be seen from the above, the processing box is provided with the above-mentioned drum box or photosensitive drum, so that its service life is longer and the environmental protection is better.

[0026] In order to achieve the fourth purpose of the utility model, the utility model provides an electronic photographic imaging device, including a shell, a processing box installation cavity is provided in the shell, wherein the above-mentioned processing box is installed in the processing box installation cavity.

[0027] As can be seen from the above, the electronic photographic imaging device provided with the above-mentioned processing box has lower use cost and better imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the first embodiment of the photosensitive drum of the utility model.

[0029] Figure 2 It is a cross-sectional view of the first embodiment of the photosensitive drum of the utility model.

[0030] Figure 3 It is a reference schematic diagram of the use state of the first embodiment of the photosensitive drum of the utility model.

[0031] Figure 4 It is a schematic cross-sectional view of the partial structure of the first embodiment of the photosensitive drum of the utility model.

[0032] Figure 5 It is a structural diagram of the second embodiment of the photosensitive drum of the utility model.

[0033] Figure 6 It is a cross-sectional view of the second embodiment of the photosensitive drum of the utility model.

[0034] Figure 7 It is a reference schematic diagram of the use state of the second embodiment of the photosensitive drum of the utility model.

[0035] Figure 8 It is a schematic cross-sectional view of the partial structure of the second embodiment of the photosensitive drum of the utility model.

[0036] Fig. 9 It is a structural diagram of the first embodiment of the processing box of the utility model.

[0037] Fig.10 It is an exploded view of the first embodiment of the processing box of the utility model.

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0039] Photosensitive drum first embodiment

[0040] Reference Figure 1 and Figure 2 The photosensitive drum 100 includes an axis core 11, a first axis cover 12, a second axis cover, a drum body 14 and a coating 16. The first axis cover 12 is sleeved on the axis core 11 and is arranged close to the first end of the axis core 11, and the first axis cover 12 is preferably fixedly connected to the axis core 11; the second axis cover is sleeved on the axis core and is arranged close to the second end of the axis core 11, and the second axis cover is preferably fixedly connected to the axis core 11; the drum body 14 is sleeved on the axis core 11, and the first end of the drum body 14 is fixedly sleeved on the first axis cover 12, and the second end of the drum body 14 is fixedly sleeved on the second axis cover; the coating 16 is coated on the outer peripheral surface of the drum body 14.

[0041] Preferably, a gear 121 is formed on the first shaft cover 12, so that the photosensitive drum 100 can cooperate with the developing roller gear on the developing roller through the gear 121, so that when the photosensitive drum 100 is in a state of executing a printing job, the developing roller can drive the photosensitive drum 100 to rotate in opposite directions and synchronously through the developing roller gear and the gear 121 on the first shaft cover 12.

[0042] In addition, the drum body 14 is preferably made of aluminum alloy, so that the drum body 14 has sufficient strength and conductivity; of course, as another optional solution, the drum body 14 can also be made of other conductive materials (such as copper). The second shaft cover is provided with a conductive member, which is electrically connected to the shaft core 11 and the drum body 14 respectively.

[0043] Combination Figure 3, the middle diameter D1 of the drum body 14 is larger than the end diameter D2 of the drum body 14, and the first generatrix L1 of the drum body 14 is arc-shaped; in addition, in this embodiment, the overall thickness of the coating 16 is consistent. Through the design of the drum body 14, the middle of the generatrix of the drum body 14 is slightly convex to the outside of the drum body 14 at both ends, thereby making the drum body 14 roughly waist-drum-shaped; at the same time, the design of the overall thickness of the coating 16 is consistent, which can balance and alleviate the situation that the photosensitive drum 100 is in contact with the developing roller and rotates, and the force on the two ends of the photosensitive drum 100 is large and the force on the middle part is small due to micro-elastic deformation, thereby ensuring that the photosensitive drum 100 is in close contact with the developing roller, so that the wear speed of the end and the middle of the coating 16 tends to be the same, and the wear speed of the coating 16 at the step portion 160 of the developing roller (the step portion 160 is formed by the diameter difference between the developing roller shaft core 161 of the developing roller and the elastic layer 162) is reduced.

[0044] like Figure 4 As shown, on the axial section of the photosensitive drum 100, the height difference H between the highest point of the first generatrix L1 and the lowest point of the first generatrix L1 is between 0.03 mm and 0.08 mm. This design ensures that when the photosensitive drum 100 is in a printing state, when the photosensitive drum 100 undergoes slight elastic deformation, the entire photosensitive drum 100 and the developing roller can always maintain close contact, and in conjunction with the design of uniform overall thickness of the coating 16, the wear speed of the end and the middle of the coating 16 tends to be the same, so as to extend the service life of the coating 16, thereby extending the service life of the photosensitive drum 100 and the drum box or processing box equipped with the photosensitive drum 100, which is more conducive to environmental protection and reducing production costs. Among them, the thickness of the coating 16 is preferably between 0.006 mm and 0.05 mm; preferably, the thickness of the coating 16 is between 0.02 mm and 0.05 mm.

[0045] The coating 16 includes an insulating layer and a photosensitive layer, wherein the insulating layer is coated on the outer peripheral surface of the drum body 14, and the photosensitive layer is coated on the insulating layer. The insulating layer can ensure that the surface of the photosensitive drum 100 can stably store charges to prevent charge leakage; the photosensitive layer is used to respond to light (such as laser) and change its own conductivity to form an electrostatic latent image. Among them, the photosensitive layer can be made of one or more layers of organic photoconductive material (OPC). The organic photoconductive material can change its conductivity when it is irradiated by laser, so that the irradiated area and the non-irradiated area present different charge states; as another optional scheme, the photosensitive layer can also be made of selenium (Se) or based on selenium and other materials [such as cadmium sulfide (CdS)], so that when the photosensitive layer is irradiated by laser, charge carriers will be generated and disappeared in the photosensitive layer, thereby realizing photoelectric conversion; as another optional scheme, the photosensitive layer can also be made of amorphous silicon (a-Si) material. The photosensitive layer made of amorphous silicon material usually includes different functional sublayers, such as a photogenerated carrier generation layer (Charge Generation Layer, CGL), which is used to directly respond to laser irradiation to generate electron-hole pairs, and a photogenerated carrier transport layer (Charge Transport Layer, CTL) allows carriers to effectively move to a suitable collection position on the drum surface.

[0046] Preferably, the coating 16 includes an anti-reflection layer and a protective layer, wherein the anti-reflection layer is coated on the photosensitive layer, and the protective layer is coated on the anti-reflection layer. The anti-reflection layer can reduce unnecessary external light reflection, thereby ensuring that the laser or other light source can effectively irradiate the photosensitive layer; while the protective layer can protect the photosensitive layer, enhance the wear resistance and oxidation resistance of the coating 16, and prevent the photosensitive layer from being chemically eroded and affected by the environment, which is conducive to further extending the service life of the photosensitive drum 100.

[0047] In summary, it can be seen that through the design of the photosensitive drum 100, when the photosensitive drum 100 contacts the elastic layer 162 of the developing roller, in the axial direction of the photosensitive drum 100, the contact interference between the middle position of the photosensitive drum 100 and the elastic layer 162 is larger than the contact interference between the end position of the photosensitive drum 100 and the elastic layer 162, so that the reaction force at the middle position of the photosensitive drum 100 is also slightly increased, thereby balancing the slightly larger force at the two ends of the photosensitive drum 100 caused by the slight deformation of the photosensitive drum 100 and the developing roller, and reducing the contact interference between the step portion 160 of the developing roller and the coating 16 at the end of the photosensitive drum 100, so as to reduce the interaction force between the elastic layer 162 at the step portion 160 and the coating 16 at the end, thereby making the coating 16 at the end of the photosensitive drum 100 less susceptible to damage and slowing down the wear rate, thereby effectively extending the service life of the photosensitive drum 100.

[0048] Photosensitive drum second embodiment

[0049] Reference Figures 5 to 8 The difference between this embodiment and the first embodiment of the photosensitive drum is the thickness of the coating. The following is an explanation of the difference. In this embodiment:

[0050] The thickness W1 of the coating 21 of the photosensitive drum 200 near the end of the drum body 22 is greater than the thickness W2 of the middle part of the coating 21 near the middle part of the drum body 22. By making the thickness W1 of the coating 21 large at the end and small at the middle part, and matching the waist-drum-shaped structure of the drum body 22, the thickness of the coating 21 in contact with the step 240 of the developing roller 24 is larger, so as to adapt to the situation where the wear speed at the end of the coating 21 is fast, thereby extending the service life of the end of the coating 21. Among them, the waist-drum-shaped structure design of the drum body 22 is conducive to increasing the thickness W1 of the coating 21 at the end, so as to adapt to the situation where the wear speed at the end of the coating 21 is faster than the wear speed at the middle of the coating 21, thereby extending the service life of the coating 21. It can be seen that under the coordinated design between the drum body 22 and the coating 21, the service life of the photosensitive drum 200 and the drum box or processing box equipped with the photosensitive drum 200 can be effectively extended, and the environmental protection of the photosensitive drum 200 and the drum box or processing box equipped with the photosensitive drum 200 can be improved.

[0051] Preferably, the middle thickness W2 is preferably between 0.006 mm and 0.05 mm, and the end thickness W1 is preferably greater than 0.006 mm and less than or equal to 0.13 mm. Preferably, the middle thickness W2 is between 0.02 mm and 0.05 mm, and the end thickness W1 is greater than 0.02 mm and less than or equal to 0.13 mm.

[0052] Furthermore, the second generatrix L2 of the coating 21 is a straight line, which is parallel to the shaft core 23 of the photosensitive drum 200; this design is conducive to solving the problem of short service life of the coating 21 caused by fast wear speed at the end of the coating 21 and slow wear speed in the middle. Of course, as another optional solution, the diameter of the middle part of the coating 21 can also be larger than the diameter of the end of the coating 21, so that the second generatrix L2 is an arc.

[0053] In summary, when the photosensitive drum 200 provided in the present embodiment contacts the elastic layer 241 of the developing roller 24, the photosensitive drum 200 is subjected to a large force near the supporting end, so the coating 21 at the stepped portion 240 near the developing roller 24 wears faster and more. By increasing the end thickness W1 of the coating 21, the disadvantages of the short service life caused by the fast wear speed and large wear amount at the end of the coating 21 can be compensated, thereby effectively extending the service life of the coating 21 and the photosensitive drum 200, and also making the service life of the drum box or process equipped with the photosensitive drum 200 longer, which is more environmentally friendly and reduces the cost of use.

[0054] Drum cartridge embodiment

[0055] The drum box includes a drum frame, a photosensitive drum, a bias device and a charging roller. The photosensitive drum is rotatably mounted on the drum frame; the bias device is mounted on the drum frame, and the charging roller is connected to the bias device, so that the bias device can force the charging roller to be in close contact with the photosensitive drum. The photosensitive drum is the photosensitive drum described in the first embodiment or the second embodiment of the photosensitive drum. The drum box has the advantages of long service life and good environmental protection by arranging the photosensitive drum.

[0056] Process cartridge first embodiment

[0057] Reference Fig. 9 and Fig.10 In this embodiment, the processing box 300 is preferably an integrated processing box. The processing box 300 includes a frame 31, a third developing roller 32 and a photosensitive drum 33. The third developing roller 32 and the photosensitive drum 33 are both rotatably mounted on the frame 31, and the third developing roller 32 is in contact with the photosensitive drum 31. Among them, the photosensitive drum 33 is the photosensitive drum described in the first embodiment or the second embodiment of the photosensitive drum. It can be seen that by setting the above-mentioned photosensitive drum 33, the processing box 300 has a longer service life and better environmental protection.

[0058] Processing cartridge second embodiment

[0059] In this embodiment, the processing box is preferably an integrated processing box. The processing box includes a second developing frame, a second developing roller, an end cover assembly and a drum box; wherein the drum box is the drum box described in the above drum box embodiment. The second developing roller is rotatably mounted on the second developing frame, the end cover assembly is connected to the second developing frame and the drum frame respectively, and the second developing roller can contact the photosensitive drum. It can be seen that by setting the above processing box, the processing box has a longer service life and better environmental protection.

[0060] Processing cartridge third embodiment

[0061] In this embodiment, the processing box is preferably a split processing box. The processing box includes a developing box and a drum box, wherein the drum box is the drum box described in the above drum box embodiment. The developing box includes a first developing frame and a first developing roller, the first developing roller is rotatably mounted on the first developing frame, the drum frame is movably connected to the first developing frame, and the first developing roller can contact or separate from the photosensitive drum. It can be seen that by setting the above processing box, the processing box has a longer service life and better environmental protection.

[0062] Electrophotographic imaging device embodiment

[0063] The electronic photographic imaging device comprises a housing and a processing box, wherein a processing box installation cavity is provided in the housing, and the processing box is installed in the processing box installation cavity. The processing box is the processing box described in any one of the first embodiment to the third embodiment of the processing box. It can be seen that the electronic photographic imaging device of the processing box has a lower use cost and better imaging quality by providing the above processing box.

[0064] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Photosensitive drum, including: Axis core; a first shaft cover, wherein the first shaft cover is sleeved on the shaft core; a second shaft cover, the second shaft cover being sleeved on the shaft core; A drum body, wherein a first end of the drum body is sleeved on the first shaft cover, and a second end of the drum body is sleeved on the second shaft cover; A coating, the coating being coated on the outer peripheral surface of the drum body; Features: The middle diameter of the drum body is larger than the end diameter of the drum body, and the first generatrix of the drum body is an arc; The coating has a uniform thickness throughout, or The thickness of the coating at the end portion close to the end portion of the drum body is greater than the thickness of the coating at the middle portion close to the middle portion of the drum body.

2. The photosensitive drum according to claim 1, characterized in that: On the axial cross section of the photosensitive drum, a height difference between a highest point of the first generatrix and a lowest point of the first generatrix is ​​between 0.03 mm and 0.08 mm.

3. The photosensitive drum according to claim 2, characterized in that: When the overall thickness of the coating is uniform, the thickness of the coating is between 0.006 mm and 0.05 mm; When the thickness of the end portion of the coating is greater than the thickness of the middle portion of the coating, the thickness of the middle portion is between 0.006 mm and 0.05 mm, and the thickness of the end portion is greater than 0.006 mm and less than or equal to 0.13 mm.

4. The photosensitive drum according to claim 3, characterized in that: When the thickness of the end portion of the coating is greater than the thickness of the middle portion of the coating, the second generatrix of the coating is a straight line, and the straight line is parallel to the axis; or When the thickness of the end portion of the coating is greater than the thickness of the middle portion of the coating, the diameter of the middle portion of the coating is greater than the diameter of the end portion of the coating, and the second generatrix is ​​an arc.

5. The photosensitive drum according to claim 4, characterized in that: The coating comprises: An insulating layer, the insulating layer covering the outer peripheral surface of the drum body; A photosensitive layer is coated on the insulating layer.

6. The photosensitive drum according to claim 5, characterized in that: The coating comprises: an anti-reflection layer, the anti-reflection layer being coated on the photosensitive layer; A protective layer is coated on the anti-reflection layer.

7. The photosensitive drum according to any one of claims 1 to 6, characterized in that: A gear is formed on the first shaft cover.

8. A drum box, comprising a drum frame, characterized in that It also includes the photosensitive drum according to any one of claims 1 to 7, wherein the photosensitive drum is rotatably mounted on the drum frame.

9. A process cartridge, characterized in that: The process cartridge comprises a developing cartridge and a drum cartridge as claimed in claim 8, the developing cartridge comprises a first developing frame and a first developing roller, the first developing roller is rotatably mounted on the first developing frame, the drum frame is movably connected to the first developing frame, and the first developing roller can contact or separate from the photosensitive drum; or The process cartridge comprises a second developing frame, a second developing roller, an end cover assembly and the drum cartridge as claimed in claim 8, wherein the second developing roller is rotatably mounted on the second developing frame, the end cover assembly is connected to the second developing frame and the drum frame respectively, and the second developing roller is contactable with the photosensitive drum; or The process box comprises a frame, a third developing roller and a photosensitive drum as claimed in any one of claims 1 to 7, wherein the third developing roller and the photosensitive drum are both rotatably mounted on the frame, and the third developing roller is in contact with the photosensitive drum.

10. An electronic photographic imaging device, comprising a housing, wherein a process cartridge installation cavity is provided in the housing, wherein: The process cartridge as claimed in claim 9 is installed in the process cartridge installation cavity.

Images