Processing box

Abstract

The present invention relates to a process cartridge detachably mounted to an image forming apparatus, the process cartridge including: a developing unit including a developing housing and a developing roller rotatably disposed in the developing housing; the photosensitive unit comprises a photosensitive shell and a photosensitive drum rotatably arranged in the photosensitive shell; the first driving force receiving part is used for receiving the driving force output by the imaging equipment so as to directly or indirectly drive the developing roller to rotate and comprises a first part and a second part which are arranged in a split manner, and the second driving force receiving part is used for receiving the driving force output by the imaging equipment so as to directly drive the photosensitive drum to rotate; the first end cover is arranged at the longitudinal tail end of the processing box and is provided with a first through hole and a second through hole, the first driving force receiving piece is exposed through the first through hole, and the second driving force receiving piece is exposed through the second through hole; the inner diameter of the first through hole is smaller than that of the second through hole; the design can ensure stable rotation of the first driving force receiving part.

Description

Technical Field

[0001] The invention relates to the technical field of electronic photographic imaging, and in particular to a processing box suitable for electronic photographic imaging equipment. Background Art

[0002] The processing box is an essential component of the imaging device, and the processing box includes a developing unit for accommodating toner and a photosensitive unit for accommodating waste toner; the photosensitive unit includes a photosensitive housing and a photosensitive drum rotatably arranged in the photosensitive housing, and the developing unit includes a developing housing and a developing roller rotatably arranged in the developing housing, and the developing roller is used to supply toner to the photosensitive drum, thereby developing the electrostatic latent image on the photosensitive drum; the processing box also includes a first driving force receiving member for receiving the driving force output by the driving force output member in the imaging device, and the first driving force receiving member directly or indirectly drives the developing roller to rotate.

[0003] In the prior art, the imaging device is provided with an elastic member forcing the driving force output member to be pushed toward the accommodating chamber of the imaging device (which can accommodate the processing box). When the processing box performs imaging work, the driving force output member will apply a force close to the developing shell to the first driving force receiving member, which may cause the first driving force receiving member to be unable to rotate stably. Summary of the invention

[0004] The present invention provides a process cartridge adopting the following technical solution to enable the first driving force receiving member to rotate stably, specifically:

[0005] A processing box is detachably installed in an imaging device; the processing box includes: a developing unit, including a developing shell for accommodating carbon powder, and a developing roller rotatably arranged in the developing shell, the developing roller is used to carry carbon powder, and the rotation axis of the developing roller extends in the longitudinal direction; a photosensitive unit, including a photosensitive shell and a photosensitive drum rotatably arranged in the photosensitive shell, the developing roller supplies carbon powder to the photosensitive drum; a first driving force receiving member, used to receive the driving force output by the imaging device to directly or indirectly drive the developing roller to rotate, including a first part and a second part which are separately arranged, and a second driving force receiving member, used to receive the driving force output by the imaging device to directly drive the photosensitive drum to rotate; a first end cover, arranged at the longitudinal end of the processing box, provided with a first through hole and a second through hole, the first driving force receiving member is exposed through the first through hole, and the second driving force receiving member is exposed through the second through hole; the inner diameter of the first through hole is smaller than the inner diameter of the second through hole.

[0006] Further, the first part includes a base and a first driving force receiving part and a connecting part arranged on the base, the base is used to support the first driving force receiving part, and the connecting part is used to connect the first part and the second part; the second part includes a shaft part and a connected part, the shaft part and the connected part are connected to each other, and the processing box also includes a driving gear connected to the second part, and the driving gear is used to transmit the driving force received by the first driving force receiving member to other parts of the developing unit. Along the longitudinal direction, the shaft part is located between the driving gear and the base, and the connected part is used to cooperate with the connecting part.

[0007] Furthermore, a step portion is formed between the shaft portion and the base portion.

[0008] Furthermore, the processing box includes a protective cover arranged at one longitudinal end, the protective cover includes a protective cover body, a third through hole formed on the protective cover body, and an extension portion arranged around the circumference of the third through hole; the shaft portion is formed with an avoidance portion arranged around its circumference, and the outer diameter of the avoidance portion has the same size as the inner diameter of the extension portion.

[0009] Further, along the longitudinal direction, the escape portion penetrates the shaft portion, or the escape portion extends between two ends of the shaft portion.

[0010] Further, when the process cartridge is completely assembled, the first through hole is used to support at least a portion of at least one of the base portion and the extension portion.

[0011] Further, the outer diameter of the extension portion and the outer diameter of the base portion have the same size, and when the process cartridge is completely assembled, both the extension portion and the base portion are supported by the first through hole.

[0012] Further, the outer diameter of the base is smaller than the outer diameter of the extension portion and larger than the inner diameter of the extension portion. When the process box is assembled, the base enters the first through hole and the extension portion is supported by the first through hole.

[0013] Furthermore, the developing unit and the photosensitive unit are arranged in a front-to-back direction, and when the process box is observed along the front-to-back direction, the base and the first driving force receiving portion both protrude from the first end cover.

[0014] Further, the outer diameter of the base is greater than the inner diameter of the first through hole, or the outer diameter of the base is greater than the outer diameter of the extension portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view of a process cartridge according to the present invention.

[0016] Figure 2 It is an exploded view of some components in the processing box involved in the present invention.

[0017] Figure 3 It is a schematic diagram of the process box according to the present invention as viewed along the longitudinal direction.

[0018] Figure 4 It is a schematic diagram of the driving end of the processing box involved in the present invention after some components are hidden.

[0019] Figure 5 The present invention relates to an exploded view of the first part of the first driving force receiving member and the processing box after some components of the processing box are hidden.

[0020] Figure 6 The present invention relates to a processing box edge Figure 1 Schematic diagram of the driving end after cutting along the AA direction. DETAILED DESCRIPTION

[0021] The following is a detailed description of the structure of the processing box and other aspects of the present invention through specific implementations and with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2 As shown, the processing box 100 can be detachably installed in an electronic photographic imaging device (hereinafter referred to as the "imaging device"), and the processing box 100 includes a developing unit 10 and a photosensitive unit 20 that are combined with each other. The developing unit 10 includes a developing housing 11 for accommodating carbon powder, a developing roller 12 rotatably arranged in the developing housing 11, a powder feeding roller (not shown) and a stirring member (not shown), the developing roller 12 is used to carry carbon powder, the powder feeding roller contacts the developing roller 12 and conveys carbon powder to the developing roller 12, and the stirring member is used to stir the carbon powder in the developing housing 11 to prevent it from agglomerating; the photosensitive unit 20 includes a photosensitive housing 21 and a photosensitive drum 22 rotatably arranged in the photosensitive housing 21, and the developing roller 12 supplies carbon powder to the photosensitive drum 22 to develop the electrostatic latent image formed on the surface of the photosensitive drum 22.

[0023] To make the following description clearer, the extension direction of the rotation axis L1 of the developing roller 12 is defined as the left-right direction / longitudinal direction, the arrangement direction of the developing unit 10 and the photosensitive unit 20 is the front-to-back direction, the direction in which the developing unit 10 points to the photosensitive unit 20 is the front, and the side opposite to the front is the rear; the direction in which the developing roller 12 and the photosensitive drum 22 are not installed in the processing box 100 points to the direction in which the developing roller 12 and the photosensitive drum 22 are installed is the bottom, and the direction opposite to the bottom is the top; the extension direction of the rotation axis L3 of the first driving force receiving member 30 and the extension direction of the rotation axis L2 of the photosensitive drum 22 / the second driving force receiving member 40 are both parallel to the longitudinal direction.

[0024] like Figure 1 and Figure 2As shown, the processing box 100 also includes a first driving force receiving member 30 and a second driving force receiving member 40 for receiving the driving force output by the imaging device. The first driving force receiving member 30 directly or indirectly drives the developing roller 12 to rotate around the rotation axis L1, and the second driving force receiving member 40 directly drives the photosensitive drum 22 to rotate around the rotation axis L2. Along the left-right direction, the end of the processing box 100 that receives the driving force from the imaging device is defined as the driving end / left, and the end opposite to the driving end is defined as the non-driving end / right; along the left-right direction, the processing box 100 also has a first end cover 50 arranged at the driving end and a second end cover 51 arranged at the non-driving end. The first driving force receiving member 30 and the second driving force receiving member 40 are both exposed through the first end cover 50; the developing unit 10 and the photosensitive unit 20 are connected through the first end cover 50 and the second end cover 51, and the first end cover 50 and the second end cover 51 can be formed separately relative to the photosensitive housing 21 or the developing housing 11, or can be formed integrally with the photosensitive housing 21 or the developing housing 11. When the first end cover 50 and the second end cover 51 are both formed integrally with the photosensitive housing 21 or the developing housing 11, the first end cover 50 and the second end cover 51 can be regarded as a part of the photosensitive unit 20 or the developing unit 10; the following description takes the example that the first end cover 50 and the second end cover 51 are both formed integrally with the photosensitive housing 21 as an example.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, further, the first end cover 50 has a first end cover body 500 and a first through hole 501 and a second through hole 502 formed on the first end cover body 500, the first driving force receiving member 30 is exposed through the first through hole 501, and the second driving force receiving member 40 is exposed through the second through hole 502; the inner diameter d1 of the first through hole 501 is smaller than the inner diameter d2 of the second through hole 502; compared with the prior art, the inner diameter d1 of the first through hole 501 is larger than the inner diameter of the second through hole 502, or the inner diameter d1 of the first through hole 501 and the inner diameter d2 of the second through hole 502 have the same size. In the present application, when the inner diameter of the second through hole 502 remains unchanged compared with the prior art, the inner diameter d1 of the first through hole 501 is smaller than the inner diameter d2 of the second through hole 502, which can further enhance the strength of the first end cover 50.

[0026] like Figure 2 , Figure 4 and Figure 5As shown, the first driving force receiving member 30 is formed in a split form, including a first part 31 and a second part 32 which are separately arranged, the first part 31 including a base 311 and a first driving force receiving part 312 and a connecting part 313 which are arranged on the base 311, the first driving force receiving part 312 is used to be combined with a driving force output member in the imaging device to receive the driving force, the base 311 is used to support the first driving force receiving part 312 and enhance the strength of the first driving force receiving part 312 to avoid breaking during the process of the first driving force receiving part 312 being combined with the driving force output member, or during the process of the first driving force receiving part 312 being driven and rotated by the driving force output member, the connecting part 313 is used to be connected to the second part 32; a driving force transmission component for transmitting the driving force is also provided in the processing box 100, the driving force transmission component at least includes a driving gear 322 and a developing roller gear 14 which are meshed with each other, the driving gear 322 is connected to the second part 32, and is used to receive the driving force received by the first driving force receiving member 30 The driving force is transmitted to other parts of the developing unit 10. The developing roller gear 14 is arranged at the longitudinal end of the developing roller 12. The second part 32 is used to transmit the driving force received by the first part 31 to the driving force transmission component to drive the developing roller 12 and the powder feeding roller and other parts to rotate. The second part 32 has a shaft 321 and a connected part 323. The shaft 321 and the connected part 323 are connected to each other. Further, the connected part 323 is arranged on the shaft 321; along the longitudinal direction, the shaft 321 is located between the base 311 and the driving gear 322; the first part 31 and the second part 32 are combined with each other through the connection part 313 and the connected part 323; the first part 31 and the second part 32 are separately arranged, so that according to the structure of the driving force output part in the imaging device, the first part 31 that cooperates with it can be replaced, so that the first driving force receiving part 30 can be universal; preferably, the first part 31 and the second part 32 can be combined by snapping, or by threaded matching, magnetic matching, etc.

[0027] like Figure 2 As shown, the second driving force receiving member 40 is arranged at the longitudinal end of the photosensitive drum 22. When the second driving force receiving member 40 receives the driving force output by the imaging device, the second driving force receiving member 40 directly drives the photosensitive drum 22 to rotate. Since the first driving force receiving member 30 needs to drive the developing roller 12, the powder feeding roller and other components to rotate through the driving force transmission assembly after receiving the driving force, the torque / load of the first driving force receiving member 30 will be greater than the torque / load of the second driving force receiving member 40. Therefore, the inner diameter d1 of the first through hole 501 allowing the first driving force receiving member 30 to pass through is smaller than the inner diameter d2 of the second through hole 502 allowing the second driving force receiving member 40 to pass through, which can ensure a more stable rotation of the first driving force receiving member 30.

[0028] like Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the shaft portion 321 is formed with an escape portion 33, and the escape portion 33 is arranged around the circumference of the shaft portion 321 along the rotation direction of the first driving force receiving member 30. Along the longitudinal direction, the escape portion 33 can extend from one end of the shaft portion 321 to the other end, that is, the escape portion 33 passes through the shaft portion 321, or extend between the two ends of the shaft portion 321. The outer diameter of the base 311 is larger than the outer diameter of the shaft portion 321, so a step portion is formed between the shaft portion 321 and the base portion 311; by forming the step portion, the size of the extension portion 132, the size of the base portion 311 and the size of the first driving force receiving portion 312 can be kept unchanged. It can also suppress the first driving force receiving member 30 from swinging due to the first part 31 moving toward the developing housing 11 or the first part 31 not being supported by the first through hole 501. The unchanged size of the first driving force receiving portion 312 means that the combination mode of the first driving force receiving portion 312 and the driving force output member does not change, thereby ensuring the combination stability of the first driving force receiving member 30 and the driving force output member; when the avoidance portion 33 passes through the shaft portion 321, the outer diameter of the base 311 is also larger than the outer diameter of the avoidance portion 33, and the step portion will be formed between the base 311 and the avoidance portion 33. The following takes the avoidance portion 33 passing through the shaft portion 321 as an example.

[0029] The processing box 100 also includes a protective cover 13 arranged at the driving end, and the protective cover 13 is used to protect at least a part of the driving force transmission component. The protective cover 13 has a protective cover body 130 and a third through hole 131 formed on the protective cover body 130. The protective cover 13 also has an extension portion 132 extending from the protective cover body 131. The extension portion 132 is arranged around the circumference of the third through hole 131. When the protective cover 13 is installed, the extension portion 132 cooperates with the avoidance portion 33 and is sleeved on the radial periphery of the shaft portion 321 / avoidance portion 33 to support the shaft portion 321 and prevent the shaft portion 321 from swinging in the radial direction. The outer diameter of the extension portion 132 / the outer diameter of the avoidance portion 33 is equal to the inner diameter d1 of the first through hole 501. The size is comparable, when the processing box 100 is assembled, the first through hole 501 is used to support at least one of at least a part of the base 311 and at least a part of the extension 132; the outer diameter of the shaft 321 / the outer diameter of the avoidance portion 33 is comparable to the inner diameter of the extension 132, which can prevent the first driving force receiving member 30 from swinging during rotation. Even if the first part 31 has a tendency to swing after receiving the driving force, causing the second part 32 to have a tendency to swing with the first part 31, the tendency of the second part 32 to swing can be suppressed through the abutment between the shaft 321 / the avoidance portion 33 and the inner wall of the extension 132, and will not affect the stable transmission of driving force from the second part 32 to the driving force transmission component.

[0030] like Figure 1 , Figure 2 and Figure 6 As shown, after the first end cover 50 is installed, at least a portion of the extension portion 132 enters the first through hole 501, and then the first portion 31 of the first driving force receiving member 30 is installed from left to right toward the second portion 32, that is, the outer diameter of the extension portion 132 is the same as the inner diameter d1 of the first through hole 501, and the first through hole 501 supports the extension portion 132. The relationship between the outer diameter of the base 311 and the inner diameter d1 of the first through hole 501 does not need to be restricted, as long as the base 311 and the second portion 32 are abutted in the longitudinal direction, even if the first portion 31 has a tendency to swing after receiving the driving force, it can be suppressed by the abutment of the base 311 with the second portion 32, and then by the abutment of the second portion 32 with the inner wall of the extension portion 132, thereby limiting the movement of the first driving force receiving member 30 in the radial direction, and further enabling the first driving force receiving member 30 to rotate stably.

[0031] In some embodiments, the outer diameter of the base 311 and the outer diameter of the extension 132 are the same size as the inner diameter d1 of the first through hole 501. When the processing box 100 is assembled, at least a portion of the extension 132 and at least a portion of the base 311 are supported by the first through hole 501, thereby further preventing the first part 31 from swinging in the radial direction. In this state, when the processing box 100 is assembled, the base 311 abuts against the longitudinal end of the extension 132 / the longitudinal end of the second part 32. When the processing box 100 is observed in the longitudinal direction, at least a portion of the base 311 overlaps with the extension 132, which can limit the movement of the first driving force receiving member 30 in the longitudinal direction toward the developing housing 11, thereby helping to improve the rotational stability of the first driving force receiving member 30.

[0032] Specifically, an elastic member is provided in the imaging device to push the driving force output member toward the imaging device accommodating chamber (which can accommodate the processing box). Therefore, when the first driving force receiving member 30 is combined with the driving force output member, the driving force output member applies a force to the first driving force receiving member 30 to move toward the developing housing 10. If the movement of the first driving force receiving member 30 in the longitudinal direction is not restricted, the first driving force receiving member 30 may be disengaged from the driving force output member. At the same time, since there is usually an assembly gap between the base 311 and the inner wall 501a of the first through hole 501 (caused by the manufacturing tolerance of the base 311 and the first through hole 501), the assembly gap can make the first driving force receiving member 30 The receiving member 30 can be installed smoothly or the friction force on the first driving force receiving member 30 during the rotation process is smaller. If the movement of the first driving force receiving member 30 in the longitudinal direction is not restricted, the first driving force receiving member 30 may swing during rotation, thereby making the driving force transmission unstable; however, in this embodiment, the base 311 abuts against the longitudinal end of the extension portion 132 / the longitudinal end of the second part 32 so that the longitudinal movement of the first part 31 is suppressed, and at least a part of the base 311 can be supported by the inner wall 501a of the first through hole so that the radial movement of the first part 31 is also suppressed. Finally, the first part 31 can rotate stably.

[0033] In some embodiments, the outer diameter of the base 311 can be smaller than the outer diameter of the extension portion 132 and larger than the inner diameter of the extension portion 132. When the processing box 100 is assembled, the base 311 enters the first through hole 501, but does not have to be supported by the first through hole 501. It is sufficient to ensure that a step portion is formed between the base 311 and the shaft portion 321 / the avoidance portion 33, and the base 311 abuts against the longitudinal end of the extension portion 132 / the longitudinal end of the second portion 32 to limit the movement of the first driving force receiving member 30 in the longitudinal direction. At the same time, the first portion 31 and the second portion 32 can be quickly combined.

[0034] In some embodiments, the outer diameter of the base 311 is larger than the inner diameter d1 of the first through hole 501, or the outer diameter of the base 311 is larger than the outer diameter of the extension portion 132. When the processing box 100 is assembled, the base 311 does not need to enter the first through hole 501, so that the first part 31 and the second part 32 can be combined more quickly; observing the processing box 100 along the front-to-back direction, the base 311 and the first driving force receiving portion 312 both protrude from the first end cover 50, and the purpose of the present application can also be achieved by the abutment between the base 311 and the first end cover 50; in this embodiment, in addition to abutting against the first end cover 50, the base 311 can also maintain abutment with the longitudinal end of the extension portion 132 / the longitudinal end of the second part 32.

[0035] In some embodiments, the second driving force receiving member 40 may also be formed in a split body.

[0036] As described above, the present application can achieve the following beneficial effects:

[0037] 1. In the present application, the inner diameter d1 of the first through hole 501 allowing the first driving force receiving member 30 to pass through is smaller than the inner diameter d2 of the second through hole 502 allowing the second driving force receiving member 40 to pass through. Compared with the prior art, the inner diameter d1 of the first through hole 501 is larger than the inner diameter of the second through hole 502, or the inner diameter d1 of the first through hole 501 and the inner diameter d2 of the second through hole 502 have the same size, which can further enhance the strength of the first end cover 50.

[0038] 2. Since the first driving force receiving member 30 needs to drive the developing roller 12, the powder feeding roller and other components to rotate through the driving force transmission assembly after receiving the driving force, and the second driving force receiving member 40 directly drives the photosensitive drum 22 to rotate after receiving the driving force output by the imaging device, compared with the first driving force receiving member 30, the torque / load of the first driving force receiving member 30 will be greater than the torque / load of the second driving force receiving member 40. Therefore, the inner diameter d1 of the first through hole 501 allowing the first driving force receiving member 30 to pass through is smaller than the inner diameter d2 of the second through hole 502 allowing the second driving force receiving member 40 to pass through, which can ensure a more stable rotation of the first driving force receiving member 30.

[0039] 3. The first driving force receiving member 30 includes a first part 31 and a second part 32 which are separately arranged, so that the first part 31 which cooperates with the driving force output member in the imaging device can be replaced according to the structure of the driving force output member in the imaging device, so that the first driving force receiving member 30 can be universally used; a step portion is formed between the first part 31 and the second part 32. When the processing box 100 is assembled, the base 311 of the first part 31 abuts against the longitudinal end of the extension portion 132 / the longitudinal end of the second part 32, or the base 311 abuts against the first end cover 50, so that the elastic member in the imaging device can be prevented from pushing the driving force output member toward the accommodating chamber of the imaging device, causing the driving force output member to push the first driving force receiving member 30 toward the developing housing 11, thereby causing the first driving force receiving member 30 to be disengaged from the driving force output member, or the driving force transmission to be unstable.

[0040] 4. The outer diameter of the shaft portion 321 of the second part 32 is the same size as the inner diameter of the extension portion 132, which can prevent the shaft portion 321 from swinging in the radial direction. Even if the first part 31 is unstable after receiving the driving force, as long as the first part 31 can transmit the driving force to the second part 32, the second part 32 abuts against the inner wall of the extension portion 132, which will not affect the second part 32 from stably transmitting the driving force to the driving force transmission component.

[0041] 5. The outer diameter of the base 311 and the inner diameter of the extension portion 132 have the same size. When the processing box 100 is assembled, at least a portion of the extension portion 132 and at least a portion of the base 311 are supported by the first through hole 501, which can prevent the first driving force receiving member 30 from swinging in the radial direction.

[0042] 6. The outer diameter of the base 311 is smaller than the outer diameter of the extension portion 132 and larger than the inner diameter of the extension portion 132. When the processing box 100 is assembled, the base 311 enters the first through hole 501, but does not have to be supported by the first through hole 501. The first part 31 and the second part 32 can be quickly combined, and the extension portion 132 is still supported by the first through hole 501. At least the swing of the second part 32 can be suppressed.

[0043] 7. The outer diameter of the base 311 is larger than the inner diameter d1 of the first through hole 501, or the outer diameter of the base 311 is larger than the outer diameter of the extension portion 132. When the processing box 100 is assembled, the base 311 does not need to enter the first through hole 501, so that the first part 31 and the second part 32 can be combined more quickly, and the movement of the first part 31 in the longitudinal direction can be suppressed, and the first driving force receiving member 30 can still rotate stably.

Claims

1. A process cartridge, detachably mounted in an imaging device; characterized in that: The processing box comprises: A developing unit, comprising a developing housing for containing carbon powder, and a developing roller rotatably arranged in the developing housing, wherein the developing roller is used to carry carbon powder, and a rotation axis of the developing roller extends in a longitudinal direction; The photosensitive unit comprises a photosensitive housing and a photosensitive drum rotatably arranged in the photosensitive housing, and a developing roller supplies toner to the photosensitive drum; A first driving force receiving member, used for receiving the driving force output by the imaging device to directly or indirectly drive the developing roller to rotate, comprising a first part and a second part which are separately arranged; A second driving force receiving member, used for receiving the driving force output by the imaging device to directly drive the photosensitive drum to rotate; a first end cover, disposed at a longitudinal end of the process cartridge, provided with a first through hole and a second through hole, through which the first driving force receiving member is exposed, and through which the second driving force receiving member is exposed; An inner diameter of the first through hole is smaller than an inner diameter of the second through hole.

2. The process cartridge according to claim 1, wherein: The first part includes a base, a first driving force receiving part and a connecting part provided on the base, the base is used to support the first driving force receiving part, and the connecting part is used to connect the first part and the second part; The second part includes a shaft portion and a connected portion, and the shaft portion and the connected portion are connected to each other. The processing box also includes a driving gear connected to the second part, and the driving gear is used to transmit the driving force received by the first driving force receiving member to other components of the developing unit. Along the longitudinal direction, the shaft portion is located between the driving gear and the base, and the connected portion is used to cooperate with the connecting portion.

3. The process cartridge according to claim 2, wherein: A step portion is formed between the shaft portion and the base portion.

4. The process cartridge according to claim 3, wherein: The process box comprises a protective cover arranged at one longitudinal end, the protective cover comprises a protective cover body, a third through hole formed on the protective cover body, and an extension portion arranged around the circumference of the third through hole; The shaft portion is formed with an escape portion disposed around its circumference, and the outer diameter of the escape portion has the same size as the inner diameter of the extension portion.

5. The process cartridge according to claim 4, wherein: In the longitudinal direction, the relief portion penetrates the shaft portion, or the relief portion extends between two ends of the shaft portion.

6. The process cartridge according to claim 4, wherein: When the process cartridge is completely assembled, the first through hole is used to support at least a portion of at least one of the base portion and the extension portion.

7. The process cartridge according to claim 6, wherein: The outer diameter of the extension portion is the same as the outer diameter of the base portion, and when the process cartridge is completely assembled, both the extension portion and the base portion are supported by the first through hole.

8. The process cartridge according to claim 6, wherein: The outer diameter of the base is smaller than the outer diameter of the extension part and larger than the inner diameter of the extension part. When the process box is assembled, the base enters the first through hole and the extension part is supported by the first through hole.

9. The process cartridge according to claim 6, wherein: The developing unit and the photosensitive unit are arranged in a front-to-back direction. When the process box is observed along the front-to-back direction, the base and the first driving force receiving portion both protrude from the first end cover.

10. The process cartridge according to claim 6, wherein: The outer diameter of the base is larger than the inner diameter of the first through hole, or, The outer diameter of the base portion is greater than the outer diameter of the extension portion.

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