Photosensitive drum pre-positioning assembly, photosensitive drum and processing box

Abstract

The utility model relates to a photosensitive drum pre-positioning assembly which is arranged at the longitudinal tail end of a photosensitive drum, the photosensitive drum is rotatably arranged in a processing box, the photosensitive drum further comprises a drum core, and the outer circumference of the drum core is used for forming an electrostatic latent image; the processing box comprises a photosensitive shell, and the photosensitive drum is pre-positioned on the photosensitive shell through the photosensitive drum pre-positioning assembly; according to the utility model, through the first drum pre-positioning part arranged on the first pre-positioning piece and the second drum pre-positioning part arranged on the second pre-positioning piece, the photosensitive drum can be pre-positioned on the photosensitive shell, so that the photosensitive drum is prevented from falling off from the photosensitive shell, and the processing box can be better assembled.

Description

Technical Field

[0001] This utility model relates to the field of electrophotographic imaging, and more particularly to a processing box that can be detachably installed in an electrophotographic imaging device, as well as a photosensitive drum pre-positioning component and a photosensitive drum in the processing box. Background Technology

[0002] Processing cartridges are widely used in electrophotographic imaging equipment (hereinafter referred to as "imaging equipment") such as laser printers / copiers. Typically, a processing cartridge includes a developing unit and a photosensitive unit that are combined together. This type of processing cartridge is an integrated processing cartridge, which is usually sold as a single product. In addition, there is a separate processing cartridge, in which the developing unit and the photosensitive unit are sold as two separate products. In use, the developing unit is first installed onto the photosensitive unit, and then the photosensitive unit with the developing unit installed is installed onto the imaging equipment. The developing unit is also called a developing cartridge, and the photosensitive unit is also called a drum unit. Generally, the photosensitive unit includes a housing and a photosensitive drum rotatably mounted on the housing. The photosensitive drum is used to carry externally supplied toner to develop the electrostatic latent image on the outer circumferential surface of the photosensitive drum.

[0003] The photosensitive drum includes a drum core, rotating components mounted at both ends of the drum core, and a steel shaft passing through both ends of the photosensitive drum. The steel shaft can be used to support the photosensitive drum, and at the same time, the steel shaft can also serve as a conductor to electrically connect the drum core and the imaging device. However, passing through both ends of the photosensitive drum will result in a long steel shaft, which will increase the cost. During assembly, the steel shaft needs to pass through the photosensitive drum from one end to the other end, making the installation process of the photosensitive drum complicated. Utility Model Content

[0004] This utility model provides a photosensitive drum pre-positioning component, a photosensitive drum, and a processing box to solve the above-mentioned technical problems. The specific solution is as follows:

[0005] A photosensitive drum pre-positioning assembly is disposed at the longitudinal end of the photosensitive drum, which is rotatably disposed in a processing box. The photosensitive drum also includes a drum core, the outer circumference of which is used to form an electrostatic latent image. The processing box includes a photosensitive housing, and the photosensitive drum is pre-positioned on the photosensitive housing by the photosensitive drum pre-positioning assembly.

[0006] The photosensitive drum prepositioning assembly includes: a connecting portion for engaging with the longitudinal end of the drum core to install the photosensitive drum prepositioning assembly onto the drum core; and a drum prepositioning portion for rotatably engaging with the photosensitive housing to preposition the photosensitive drum; the drum prepositioning portion protruding beyond the end face of the connecting portion in the longitudinal direction.

[0007] The photosensitive drum pre-positioning assembly further includes a driving force receiving part disposed on the connecting part, the driving force receiving part being used to receive external driving force to drive the photosensitive drum to rotate.

[0008] The photosensitive drum pre-positioning assembly includes at least one of a first pre-positioning member and a second pre-positioning member, which are separately formed from the drum core. One of the first pre-positioning member and the second pre-positioning member is provided with a driving force receiving part to receive external driving force.

[0009] A photosensitive drum, comprising a drum core and a photosensitive drum pre-positioning assembly as described above, wherein the photosensitive drum pre-positioning assembly is connected to the longitudinal end of the drum core.

[0010] The processing box includes a photosensitive housing and a photosensitive drum as described above, the photosensitive drum being rotatably mounted on the photosensitive housing.

[0011] The photosensitive housing has a sidewall at a longitudinal end, on which a drum prepositioning portion is provided. The drum prepositioning portion in the photosensitive drum prepositioning assembly is rotatably engaged with the drum prepositioning portion. The drum prepositioning portion has a notch for allowing the drum prepositioning portion to enter the drum prepositioning portion. The notch is oriented in a direction perpendicular to the longitudinal direction.

[0012] The processing box also includes an end cap located at its longitudinal end, the end cap including a support shaft extending in the longitudinal direction for rotatably engaging with a photosensitive drum pre-positioning assembly, the support shaft not penetrating the drum core in the longitudinal direction.

[0013] In the longitudinal direction, the support shaft does not exceed the center of the photosensitive drum.

[0014] The side wall is provided with an end cap pre-positioning part, and the end cap further includes an end cap pre-positioning part extending in the longitudinal direction. During the assembly of the processing box, the end cap pre-positioning part is used to cooperate with the end cap pre-positioning part to pre-position the end cap.

[0015] In this invention, the photosensitive drum can be pre-positioned on the photosensitive housing by the first drum pre-positioning part provided on the first pre-positioning member and the second drum pre-positioning part provided on the second pre-positioning member, so as to prevent the photosensitive drum from falling off the photosensitive housing and to facilitate better assembly of the processing box. Attached Figure Description

[0016] Figure 1 and Figure 2 This is a perspective view of the processing box involved in an embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram of some components of the drive end involved in an embodiment of this utility model.

[0018] Figure 4 This is a schematic diagram of some components of the non-driving end involved in an embodiment of this utility model.

[0019] Figure 5 This is a schematic diagram of the processing box with its hidden components cut along the cutting line AA according to an embodiment of this utility model.

[0020] Figure 6 This is an exploded view of the photosensitive drum according to an embodiment of the present invention.

[0021] Figure 7 This is a perspective view of the second housing involved in an embodiment of this utility model. Detailed Implementation

[0022] In this application, the integrated processing box will be used as an example for detailed explanation with reference to the accompanying drawings.

[0023] Figure 1 and Figure 2 This is a perspective view of the processing box involved in an embodiment of this utility model.

[0024] The processing cartridge 100 is designed for removable installation into an imaging device for imaging / development.

[0025] by Figure 1 Taking the state shown as an example, the processing box 100 involved in this application has front and rear opposite each other in the horizontal direction, left and right opposite each other in the vertical direction, and top and bottom opposite each other in the vertical direction. Furthermore, the front-back direction, left-right direction, and up-down direction intersect each other. Preferably, the front-back direction, left-right direction, and up-down direction are perpendicular to each other.

[0026] like Figure 1 and Figure 2 As shown, the processing box 100 includes a developing unit 1 and a photosensitive unit 2 connected to each other. Specifically, the developing unit 1 includes a developing housing 10 and a developing roller 12, a powder feeding roller (not shown), and a stirring frame (not shown) rotatably disposed in the developing housing 10. The photosensitive unit 2 includes a photosensitive housing 20 and a photosensitive drum 22 rotatably disposed in the photosensitive housing 20. The developing housing 10 has a powder hopper 11 for containing toner. The stirring frame located in the powder hopper 11 stirs the toner and then conveys it to the powder feeding roller. The powder feeding roller contacts the developing roller 12 and conveys the toner to the developing roller 12. The developing roller 12 conveys the toner to the photosensitive drum 22 so that the electrostatic latent image formed on the outer circumferential surface of the photosensitive drum 22 / drum core 221 (described later) is developed. The developing roller 12 and the photosensitive drum 22 can rotate about a first axis L12 and a second axis L22 that are parallel to the longitudinal direction, respectively.

[0027] The processing box 100 also includes a drive assembly disposed at the longitudinal end, the drive assembly being used to receive and transmit drive force from the drive force output component in the imaging device to drive the photosensitive drum 22, the developing roller 12, the powder feeding roller and the stirring frame to rotate about rotation axes parallel to the longitudinal direction.

[0028] Furthermore, the drive assembly includes at least a drive force receiver that is combined with the drive force output component. In this application, the end where the drive force receiver is located is the drive end / left side, and the end opposite to the drive end / left side in the longitudinal direction / left-right direction is the non-drive end / right side.

[0029] The processing box 100 also includes a first end cap 31 and a second end cap 32 disposed at a distance from each other at two longitudinal ends, the first end cap 31 and the second end cap 32 serving at least to support the developing roller 12 and / or the photosensitive drum 22.

[0030] The processing cartridge 100 also includes a handle 33 disposed therein, which is integrally formed with or separate from the developing housing 10 / photosensitive housing 20. The handle 33 is for human hand gripping, so as to install the processing cartridge 100 into the imaging device or remove the processing cartridge 100 from the imaging device.

[0031] The processing cartridge 100 also includes a toner inlet 111 disposed on the developing housing 10 and a first sealing member (not shown) for sealing the toner inlet 111. Furthermore, the toner inlet 111 connects the interior and exterior of the toner cartridge 11. When the toner inlet 111 is disposed on the drive end, the first end cap 31 is provided with a through hole 312 opposite to the toner inlet 111. In this way, toner can be added to the toner cartridge 11 from the toner inlet 111 without removing the first end cap 31.

[0032] In some implementations, the powder filling port 111 can also be located on the non-driving end.

[0033] In some embodiments, the photosensitive housing 20 also forms a waste toner compartment 21 for containing waste toner. The processing box 100 also includes a waste toner port 211 disposed on the photosensitive housing 20 and a second sealing member (not shown) for sealing the waste toner port 211. Furthermore, the waste toner port 211 connects the inside and outside of the waste toner compartment 21. When the space of the waste toner compartment 21 is insufficient and waste toner needs to be cleaned, the photosensitive drum 22 does not need to be removed, and the waste toner can be poured out directly from the waste toner port 211. This makes the operation of cleaning waste toner simpler and more convenient. At the same time, the photosensitive unit 2 can be recycled to reduce costs and save resources.

[0034] Figure 3 This is a schematic diagram of some components of the drive end involved in an embodiment of this utility model; Figure 4 This is a schematic diagram of some components of the non-driving end involved in an embodiment of this utility model; Figure 5This is a schematic diagram of the processing box with its hidden components cut along the cutting line AA according to an embodiment of the present utility model. Figure 6 This is an exploded view of the photosensitive drum according to an embodiment of the present utility model; Figure 7 This is a perspective view of the second housing involved in an embodiment of this utility model.

[0035] like Figures 3 to 5 As shown, the first end cap 31 also includes a first body 311, a first end cap prepositioning portion 313, and a first support shaft 314. In the longitudinal direction, a through hole 312 penetrates the first body 311. The first end cap prepositioning portion 313 and the first support shaft 314 protrude longitudinally toward the non-driving end. The second end cap 32 also includes a second body 321, a second end cap prepositioning portion 322, and a second support shaft 323. The second end cap prepositioning portion 322 and the second support shaft 323 protrude longitudinally toward the driving end. Specifically, the first end cap prepositioning portion 313 and the first support shaft 314 are used to connect with the photosensitive housing 20. A portion of the first end cap 31 is pre-positioned, and a pre-positioned portion 322 of the second end cap is used to engage with a portion of the photosensitive housing 20 to pre-position the second end cap 32. In the longitudinal direction, the center of the first support shaft 314 coincides with the center of the second support shaft 323, and the centers of the first support shaft 314 and the second support shaft 323 coincide with the rotation axis (second axis L22) of the photosensitive drum 22. The first support shaft 314 and the second support shaft 323 are used to rotatably engage with the photosensitive drum pre-positioning assembly described later to allow the photosensitive drum 22 to rotate about the second axis L22.

[0036] Preferably, the first support shaft 314 and the second support shaft 323 are steel shafts. In the longitudinal direction, the first support shaft 314 and the second support shaft 323 do not penetrate the drum core 221. Furthermore, in the longitudinal direction, the first support shaft 314 and the second support shaft 323 do not exceed the center of the photosensitive drum 22. This can greatly save the required materials, thereby reducing costs, saving resources, and also reducing the overall weight of the processing box 100.

[0037] In some embodiments, a first end cap prepositioned portion 313 protrudes from a first body 311 in the longitudinal direction, a second end cap prepositioned portion 322 protrudes from a second body 321 in the longitudinal direction, a first support shaft 314 passes through the first body 311 and is fixedly connected to the first end cap 31, and a second support shaft 323 passes through the second body 321 and is fixedly connected to the second end cap 32.

[0038] In some embodiments, the first support shaft 314 and the second support shaft 323 may also be mounted on a separately mounted bracket. In the longitudinal direction, the first end cap 31 or the second end cap 32, the bracket, and the photosensitive housing 20 are arranged in sequence. The bracket is detachably connected to the photosensitive housing 20, or the bracket is detachably connected to the first end cap 31 or the second end cap 32.

[0039] In some embodiments, the first support shaft 314 is integrally formed with or separate from the first end cap 31, and the second support shaft 323 is integrally formed with or separate from the second end cap 32.

[0040] In some embodiments, the second support shaft 323 may also be made of conductive plastic, in which case the second support shaft 323 may be formed by secondary injection molding.

[0041] like Figure 6 As shown, the photosensitive drum 22 includes a drum core 221 and a photosensitive drum prepositioning assembly. The outer circumferential surface of the drum core 221 is used to carry toner and form an electrostatic latent image. The photosensitive drum prepositioning assembly is located at the longitudinal end of the drum core 221 and is connected to the drum core 221. The photosensitive drum prepositioning assembly is used to rotatably position the photosensitive drum 22 relative to the photosensitive housing 20 so that the photosensitive drum 22 is prepositioned.

[0042] The photosensitive drum pre-positioning assembly includes at least one of a first pre-positioning member 222 and a second pre-positioning member 223, which are separately formed from the drum core 221. Both the first pre-positioning member 222 and / or the second pre-positioning member 223 are cylindrical. Both the first pre-positioning member 222 and / or the second pre-positioning member 223 include a connecting portion, a drum pre-positioning portion, and a mating portion. In the longitudinal direction, the connecting portion is used to connect with the longitudinal end of the photosensitive drum 22. The drum pre-positioning portion protrudes from the connecting portion in the longitudinal direction. The drum pre-positioning portion is used to rotatably engage with a part of the photosensitive housing 20 so that the photosensitive drum 22 is rotatably disposed relative to the photosensitive housing 20. The mating portion is a recess or through hole formed inside the drum pre-positioning portion. The mating portion is used to rotatably engage with a first support shaft 314 on the first end cover 31 or a second support shaft 323 on the second end cover 32 so that the photosensitive drum 22 rotates about the second axis L22.

[0043] In some embodiments, the mating part can be interchanged with the first support shaft 314 or the second support shaft 323.

[0044] Specifically, the drum core 221 has a first end 2211 and a second end 2212 opposite to each other in the longitudinal direction. The first end 2211 is located at the driving end / left side, and the second end 2212 is located at the non-driving end / right side. In some embodiments, a first prepositioning member 222 is connected to the first end 2211, and a second prepositioning member 223 is connected to the second end 2212.

[0045] Furthermore, the first pre-positioning member 222 includes a first connecting portion 2222, a first drum pre-positioning portion 2223, and a first mating portion 2224. The first drum pre-positioning portion 2223 protrudes relative to the left end face 22221 of the first connecting portion 2222. In the longitudinal direction, the first drum pre-positioning portion 2223 is further away from the second end 2212 or the non-driving end than the left end face 22221 of the first connecting portion 2222. In the radial direction of the first pre-positioning member 222, the first connecting portion 2222 is further away from the first pre-positioning portion 2224 than the first supported portion 2223. The rotation axis of the positioning member 222; the first connecting part 2222 is used to connect with the first end 2211 of the drum core 221; the first drum prepositioning part 2223 is used to rotatably engage with the first drum prepositioning part 2012 (described later) and is supported by the first drum prepositioning part 2012 so that the photosensitive drum 22 is prepositioned; the first mating part 2224 is a recess or through hole formed inside the first drum prepositioning part 2223, and the first mating part 2224 is used to rotatably engage with the first support shaft 314 so that the photosensitive drum 22 rotates about the second axis L22.

[0046] The second pre-positioning member 223 includes a second connecting portion 2231, a second drum pre-positioning portion 2232, and a second mating portion 2233. The second drum pre-positioning portion 2232 protrudes from the right end face 22311 of the second connecting portion 2231. In the longitudinal direction, the second drum pre-positioning portion 2232 is further away from the first end 2211 or the driving end than the right end face 22311 of the second connecting portion 2231. In the radial direction of the second pre-positioning member 223, the second connecting portion 2231 is further away from the second pre-positioning portion 2232 than the second drum pre-positioning portion 2232. The rotation axis of component 223; the second connecting part 2231 is used to connect with the second end 2212 of the drum core 221; the second drum prepositioning part 2232 is used to rotatably engage with the second drum prepositioning part 2022 (described later) and is supported by the second drum prepositioning part 2022 so that the photosensitive drum 22 is prepositioned; the second mating part 2233 is a recess or through hole formed inside the second drum prepositioning part 2232, and the second mating part 2233 is used to rotatably engage with the second support shaft 323 so that the photosensitive drum 22 rotates about the second axis L22.

[0047] Furthermore, the first connecting portion 2222 and the second connecting portion 2231 are interference-fitted with the inner circumferential surface of the drum core 221, so that the first prepositioning member 222 and the second prepositioning member 223 are installed onto the drum core 221.

[0048] In some embodiments, the first prepositioning member 222 or the second prepositioning member 223 can be used to receive driving force. Taking the first prepositioning member 222 as an example, specifically, the first prepositioning member 222 also includes a driving force receiving part 2221 disposed on the first connecting part 2222. The driving force receiving part 2221 is used to combine with the driving force output member to receive driving force and drive the photosensitive drum 22 to rotate. The driving force receiving part 2221 is teeth or protrusions.

[0049] like Figure 5 and Figure 7 As shown, the photosensitive unit 2 is provided with a first end cap prepositioning part 2011, a second end cap prepositioning part 2021, a first drum prepositioning part 2012, and a second drum prepositioning part 2022. In the longitudinal direction, the first end cap prepositioning part 2011 and the second end cap prepositioning part 2021 are arranged opposite to each other. The first end cap prepositioning part 2011 is used to cooperate with the first end cap prepositioning part 313 on the first end cap 31 to preposition the first end cap 31. The second end cap prepositioning part 2021 is used to cooperate with the second end cap prepositioning part 322 on the second end cap 32 to preposition the second end cap 32. In the longitudinal direction, the first drum prepositioning part 2012 and the second drum prepositioning part 2022 are arranged opposite to each other. The first drum prepositioning part 2012 and the second drum prepositioning part 2022 are respectively used to cooperate with one end of the photosensitive drum 22 to rotatably support the photosensitive drum 22.

[0050] In some embodiments, the first end cap prepositioning portion 2011 and the first end cap prepositioned portion 313 are fitted with a shaft hole. Further, when the first end cap prepositioning portion 2011 is configured as a hole or a protrusion, the first end cap prepositioned portion 313 is configured as a protrusion or a hole. The second end cap prepositioning portion 2021 and the second end cap prepositioned portion 322 are fitted with a shaft hole. Further, when the second end cap prepositioning portion 2021 is configured as a hole or a protrusion, the second end cap prepositioned portion 322 is configured as a protrusion or a hole. It should be noted that the hole can be a through hole or a blind hole.

[0051] Furthermore, the first drum prepositioning part 2012 can be used to accommodate the first drum prepositioned part 2223, and the second drum prepositioning part 2022 can be used to accommodate the second drum prepositioned part 2232. When assembling the processing cartridge 100, during the process of combining the developing unit 1 and the photosensitive unit 2, the first drum prepositioning part 2012 and the second drum prepositioning part 2022 are used to preposition the photosensitive drum 22 on the photosensitive housing 20. That is, through the first drum prepositioning part 2012 and the second drum prepositioning part 2022, the photosensitive drum 22 can be rotatably set on the photosensitive housing 20, or the photosensitive drum 22 can be prepositioned to prevent the photosensitive drum 22 from falling off the photosensitive housing 20, or to prevent the photosensitive drum 22 from deviating from its predetermined installation position.

[0052] Furthermore, the first drum prepositioning part 2012 has a first notch 2013, and the second drum prepositioning part 2022 has a second notch 2023. The first notch 2013 is used to allow the first drum prepositioning part 2223 to enter the first drum prepositioning part 2012, and the second notch 2022 is used to allow the second drum prepositioning part 2232 to enter the second drum prepositioning part 2022. The photosensitive drum 22 is prepositioned to the photosensitive unit 2 through the first notch 2013 and the second notch 2023. The first drum prepositioning part 2012 and the second drum prepositioning part 2022 have a limiting part (not shown), which is used to prevent the photosensitive drum 22 from falling out of the first drum prepositioning part 2223 or the second drum prepositioning part 2232.

[0053] In some embodiments, the first notch 2013 and the second notch 2023 are both oriented in a direction perpendicular to the longitudinal direction. For example, the first notch 2013 and the second notch 2023 are oriented downwards, forwards, backwards, or upwards as shown in the figure, as long as it can enable the photosensitive drum 22 to be installed in a direction perpendicular to the longitudinal direction. By setting the first notch 2013 and the second notch 2023, the two longitudinal ends of the photosensitive drum 22 can be installed simultaneously.

[0054] In some embodiments, the photosensitive housing 20 includes a main body 203 and a protrusion connected to each other. In the vertical direction, the main body 203 is at least opposite to the drum core 221. The protrusion is located at the longitudinal end of the main body 203 and protrudes from both ends of the main body 203 in the vertical direction. Specifically, the protrusion includes a first sidewall 201 and a second sidewall 202. The first sidewall 201 and the second sidewall 202 are arranged opposite each other in the vertical direction at a distance. The first sidewall 201 is located at the driving end / left side, and the second sidewall 202 is located at the non-driving end / right side. The first sidewall 201 and the second sidewall 202 are respectively used to rotatably support the two ends of the photosensitive drum 22.

[0055] Furthermore, the first sidewall 201 has a first surface 2014 opposite to the second sidewall 202, and the second sidewall 202 has a second surface 2024 opposite to the first sidewall 201. In the longitudinal direction, the distance between the first surface 2014 and the second surface 2024 is not greater than the distance between the left end surface 22221 of the first prepositioning member 222 and the right end surface 22311 of the second prepositioning member 223. This allows the photosensitive drum 22 to be restricted from moving in the longitudinal direction. In this way, when the processing cartridge 100 is assembled, or when the processing cartridge 100 is used for imaging / development in the imaging device, the photosensitive drum 22 can remain stable and will not move in the longitudinal direction, thereby ensuring the imaging / development quality.

[0056] In some embodiments, the first end cap prepositioning part 2011, the second end cap prepositioning part 2021, the first drum prepositioning part 2012, and the second drum prepositioning part 2022 are disposed on the photosensitive housing 20. Specifically, the first end cap prepositioning part 2011 and the first drum prepositioning part 2012 are located on the first side wall 201 or the second side wall 202, and the second end cap prepositioning part 2021 and the second drum prepositioning part 2022 are located on the second side wall 202 or the first side wall 201.

[0057] In some embodiments, the first end cap prepositioning part 2011, the second end cap prepositioning part 2021, the first drum prepositioning part 2012, and the second drum prepositioning part 2022 may also be disposed on the additionally disposed bracket. In the longitudinal direction, the first end cap 31 or the second end cap 32, the bracket, and the photosensitive housing 20 are arranged in sequence. The bracket is detachably connected to the photosensitive housing 20, or the bracket is detachably connected to the first end cap 31 or the second end cap 32.

[0058] The beneficial effects that can be obtained from this utility model are:

[0059] 1. The first support shaft 314 and the second support shaft 323 are respectively disposed on the first end cover 31 and the second end cover 32. Moreover, the first support shaft 314 and the second support shaft 323 do not need to pass through the entire photosensitive drum 22 in the longitudinal direction, which can save materials and reduce the overall weight of the processing box 100.

[0060] 2. The first support shaft 314 is pre-set on the first end cover 31, and the second support shaft 323 is pre-set on the second end cover 32. When the first end cover 31 and the second end cover 32 are installed, the first support shaft 314 and the second support shaft 323 respectively enter the first mating part 2224 and the second mating part 2233, which can speed up the assembly speed of the processing box 100 and facilitate the assembly of the processing box 100.

[0061] 3. When assembling the processing box 100, the first drum prepositioned portion 2223 provided on the first prepositioning member 222 and the second drum prepositioned portion 2232 provided on the second prepositioning member 223 are rotatably engaged with the first drum prepositioned portion 2012 and the second drum prepositioned portion 2022 on the photosensitive housing 20, respectively, so as to preposition the photosensitive drum 22 to prevent the photosensitive drum 22 from falling off the photosensitive housing 20, so as to facilitate better assembly of the processing box 100.

[0062] 4. By means of the first end cover prepositioning part 2011 and the second end cover prepositioning part 2021, when installing the first end cover 31 and the second end cover 32, the first end cover 31 and the second end cover 32 can be prepositioned, thereby enabling the first support shaft 314 to enter the first mating part 2224 more accurately and the second support shaft 323 to enter the second mating part 2233 more accurately.

Claims

1. A photosensitive drum pre-positioning assembly, disposed at the longitudinal end of a photosensitive drum, the photosensitive drum being rotatably disposed within a processing cartridge, characterized in that, The photosensitive drum also includes a drum core, the outer circumference of which is used to form an electrostatic latent image; The processing box includes a photosensitive housing, and the photosensitive drum is pre-positioned on the photosensitive housing by the photosensitive drum pre-positioning assembly.

2. The photosensitive drum pre-positioning assembly according to claim 1, characterized in that, The photosensitive drum pre-positioning component includes: A connecting part, which is used to mate with the longitudinal end of the drum core so that the photosensitive drum prepositioning assembly is installed onto the drum core; The drum is prepositioned, and is rotatably fitted with the photosensitive housing to preposition the photosensitive drum. In the longitudinal direction, the drum is prepositioned and protrudes from the end face of the connecting part.

3. The photosensitive drum pre-positioning assembly according to claim 2, characterized in that, The photosensitive drum pre-positioning assembly further includes a driving force receiving part disposed on the connecting part, the driving force receiving part being used to receive external driving force to drive the photosensitive drum to rotate.

4. The photosensitive drum pre-positioning assembly according to claim 1, characterized in that, The photosensitive drum pre-positioning assembly includes at least one of a first pre-positioning member and a second pre-positioning member, which are separately formed from the drum core. One of the first pre-positioning member and the second pre-positioning member is provided with a driving force receiving part to receive external driving force.

5. A photosensitive drum, characterized in that, The photosensitive drum includes a drum core and a photosensitive drum pre-positioning assembly as described in any one of claims 1-4, wherein the photosensitive drum pre-positioning assembly is connected to the longitudinal end of the drum core.

6. A processing box, characterized in that, The processing box includes a photosensitive housing and a photosensitive drum as described in claim 5, wherein the photosensitive drum is rotatably mounted on the photosensitive housing.

7. The processing box according to claim 6, characterized in that, The photosensitive housing has a sidewall at a longitudinal end, on which a drum prepositioning portion is provided. The drum prepositioning portion in the photosensitive drum prepositioning assembly is rotatably engaged with the drum prepositioning portion. The drum prepositioning portion has a notch for allowing the drum prepositioning portion to enter the drum prepositioning portion. The notch is oriented in a direction perpendicular to the longitudinal direction.

8. The processing box according to claim 6, characterized in that, The processing box also includes an end cap located at its longitudinal end, the end cap including a support shaft extending in the longitudinal direction for rotatably engaging with a photosensitive drum pre-positioning assembly, the support shaft not penetrating the drum core in the longitudinal direction.

9. The processing box according to claim 8, characterized in that, In the longitudinal direction, the support shaft does not exceed the center of the photosensitive drum.

10. The processing box according to claim 8, characterized in that, The photosensitive housing has a sidewall at a longitudinal end, and an end cap prepositioning portion is provided on the sidewall. The end cap also includes an end cap prepositioning portion extending in the longitudinal direction. During the assembly of the processing box, the end cap prepositioning portion is used to cooperate with the end cap prepositioning portion to preposition the end cap.

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