CN111413856B

CN111413856B - Process cartridge and image forming apparatus

Info

Publication number: CN111413856B
Application number: CN202010299875.1A
Authority: CN
Inventors: 万成昌; 刘录军; 田伙林
Original assignee: Topjet Technology Co ltd; Zhongshan Sanrun Printing Supplies Co ltd
Current assignee: Topjet Technology Co ltd; Zhongshan Sanrun Printing Supplies Co ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2023-06-13
Anticipated expiration: 2040-04-16
Also published as: CN111413856A

Abstract

The invention relates to a process cartridge and an image forming apparatus provided with a force applying member, the process cartridge being detachably mounted in the image forming apparatus, comprising a hopper and a waste hopper which are combined with each other, and a movable member movably mounted therein, the hopper and the waste hopper being relatively rotatable, the hopper and the waste hopper being brought close to each other when the process cartridge is in operation, the movable member receiving an urging force from the urging member to urge the hopper and the waste hopper to be separated from each other when the process cartridge is not in operation, a force receiving surface on the movable member for receiving the urging force not facing upward when the process cartridge is placed upside down, and therefore, the urging member does not have to be expanded and contracted, a moving process thereof is simplified, and correspondingly, a structure of the laser printer is also simplified.

Description

Process cartridge and image forming apparatus

Technical Field

The present invention relates to the field of electrophotographic image forming, and more particularly, to a process cartridge detachably mountable to an electrophotographic image forming apparatus.

Background

A laser printer is one of common electrophotographic image forming apparatuses, into which a process cartridge is usually detachably mounted, and in which a photosensitive member forming an electrostatic latent image and a developing member for conveying a developer (toner) to the surface of the photosensitive member and developing the electrostatic latent image are provided for the purpose of image formation.

Generally, the photosensitive member is a cylindrical member formed by coating a photosensitive material on the surface of an aluminum base, the developing member is a roller member made of an elastic material covered on the surface of a metal shaft, and the developing member abuts against the surface of the photosensitive member when the process cartridge is in operation; when the process cartridge is not in operation, if the developing member is still kept against the surface of the photosensitive member, on the one hand, irreversible elastic deformation of the elastic material of the surface of the developing member may be caused, and on the other hand, contamination of the surface of the photosensitive member by the developing member may be caused, thereby degrading the image quality.

For this reason, there has been a solution in which a force application member is provided in the laser printer, and a force receiving member is provided in the process cartridge, and when the process cartridge is not operated, the force application member applies a force to the force receiving member to force the developing member to be separated from the surface of the photosensitive member, and when the process cartridge is operated, the force application member no longer applies a force to the force receiving member, and the developing member is again abutted against the photosensitive member.

For example, U.S. Pat. No. 9836020, in which a projection 44d is provided in the process cartridge P, the projection 44d has a force receiving surface 44b for engaging with a force applying member 61 in the laser printer, as shown in fig. 15 of the patent, the force applying member 61 is provided to be retractable in directions indicated by H1 and H2 in the drawing, the force applying member 61 is in an extended state before the process cartridge P is mounted to a predetermined position, the force applying member 61 is pressed to retract when the process cartridge P moves in the direction indicated by H1 with the tray 28, and then the force applying member 61 moves in the direction indicated by N so that the force applying member 61 no longer interferes with the process cartridge P but protrudes in the direction indicated by H2, and when the process cartridge P is not operated, the force applying member 61 moves in the direction indicated by M, contacts and applies force to the force receiving surface 44b, and finally, the photosensitive member and the developing member in the process cartridge P are separated.

To ensure that the force application member 61 no longer interferes with the process cartridge P, the force application member 61 needs to move a sufficient distance in the direction indicated by N, and when the process cartridge P is not in operation, the force application member 61 needs to return not only to the initial position interfering with the process cartridge P in the direction indicated by M, but also to continue to move a certain distance in the direction indicated by M to be engageable with the force receiving surface 44b,

as described above, in order to ensure that the process cartridge P can smoothly receive the urging force applied by the urging member 61, the movement process of the urging member 61 in the laser printer is complicated, and accordingly, the structure of the laser printer becomes insufficiently simplified.

Disclosure of Invention

The invention provides an improved processing box, which simplifies the movement process of a force application part by improving a part used for being combined with the force application part in the processing box, thereby simplifying the structure of a laser printer, and the processing box adopts the following technical scheme:

a process cartridge detachably mounted in an image forming apparatus provided with a force applying member, the process cartridge including a hopper and a waste hopper combined with each other, a movable member movably mounted therein, and a photosensitive member rotatably mounted in the waste hopper and a developing member rotatably mounted in the hopper, the hopper and the waste hopper being brought into close contact with each other when the process cartridge is in operation, the developing member and the photosensitive member being brought into contact with each other, the movable member receiving a force from the force applying member to force the hopper to rotate about an axis L to be separated from each other when the process cartridge is not in operation, the developing member and the photosensitive member being separated from each other; the movable piece comprises an installation part, an action part and a limiting piece, wherein the installation part and the action part are connected with each other, the limiting piece protrudes from the installation part, the installation part is used for installing the movable piece, the action part is used for receiving the acting force of the force application piece and is abutted with the powder bin, so that the powder bin and the waste powder bin are separated from each other, and the limiting piece is used for limiting the rotation of the movable piece; designating the end of the processing box, which is not provided with the photosensitive element, to point to the end provided with the photosensitive element in the +Z direction; when the processing box is placed upside down, the force receiving surface on the movable part for receiving the acting force is not upward facing, and the abutting position of the acting part and the powder bin and the developing part are both positioned in the +Z direction of the axis L.

Preferably, the free end of the movable member is not opposite to the urging member; designating the direction from the powder bin to the waste powder bin as +Y direction, and conversely as-Y direction, when the processing box moves to +Z direction, the free tail end is positioned in-Y direction of the force application part.

As one embodiment, the force receiving surface faces the +z and +y directions; the force-receiving surface as another embodiment faces in the +y direction.

Preferably, the process cartridge further includes a holding member for holding the force receiving surface in a predetermined force receiving position, the holding member being located between the movable member and the hopper or between the movable member and the waste hopper.

The acting portion includes a first protruding portion protruding from the mounting portion and a second protruding portion protruding from the first protruding portion, wherein the first protruding portion has a first force receiving surface, and the second protruding portion has a second force receiving surface, neither the first force receiving surface nor the second force receiving surface facing upward.

The present invention also provides an image forming apparatus including a main body and a force application member provided on the main body, the process cartridge being detachably mounted on the main body.

As described above, when the process cartridge is placed upside down, the force receiving surface of the movable member for engaging with the urging member provided in the laser printer does not face upward, and therefore, the urging member does not need to be stretched, the movement process thereof is simplified, and accordingly, the structure of the laser printer is also simplified.

Drawings

Fig. 1 is a perspective view of a process cartridge according to the present invention.

Fig. 2A is a cross-sectional view of the process cartridge according to the present invention taken along a longitudinal middle portion thereof.

Fig. 2B is a schematic view of the process cartridge shown in fig. 2A after being inverted.

Fig. 3 is a partially exploded view of a powder cartridge in a process cartridge according to the present invention.

Fig. 4 is a perspective view of a movable member in the process cartridge according to the present invention.

Fig. 5A and 5B are schematic views showing the state before and after the process cartridge according to the present invention is combined with the urging member.

Detailed Description

Embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Fig. 1 is a perspective view of a process cartridge according to the present invention. The process cartridge 1 is detachably mounted in an image forming apparatus including a main body on which the process cartridge 1 is mounted, and a force application member 9 provided on the main body. As shown in the drawing, the process cartridge 1 includes a hopper 3 and a waste hopper 2 combined with each other, and a movable member 6 installed therein, wherein the hopper 3 and the waste hopper 2 are relatively rotatable, the hopper 3 and the waste hopper 2 are close to each other when the process cartridge 1 is operated, and the movable member 6 receives a force from the image forming apparatus to force the hopper 3 and the waste hopper 2 to be separated from each other when the process cartridge 1 is not operated.

Further, the process cartridge 1 further includes a first end cap 4 and a second end cap 5 at both ends of the process cartridge, respectively, and the powder hopper 3 and the waste powder hopper 2 are coupled by the first end cap 4 and the second end cap 5, and the first end cap 4 and the second end cap 5 may exist as separate components, respectively, or may exist as a part of the powder hopper 3 or the waste powder hopper 2.

For convenience of description hereinafter, the longitudinal direction of the process cartridge 1 is defined as the longitudinal direction X in conjunction with fig. 1, the width direction of the process cartridge 1 shown in fig. 1 is the lateral direction Y, the height direction of the process cartridge 1 shown in fig. 1 is the vertical direction Z, the direction from the first end cap 4 to the second end cap 5 is the +x direction, and the direction from the powder bin 3 to the waste powder bin 2 is the +y direction.

Example one

Fig. 2A is a cross-sectional view of the process cartridge according to the present invention taken along a longitudinal middle portion thereof; fig. 2B is a schematic view of the process cartridge shown in fig. 2A after being inverted.

As shown in fig. 1 and 2A, the hopper 3 includes a hopper housing 30, a developing member 32 rotatably mounted in the hopper housing 30, and a supply member 34, and the waste hopper 2 includes a waste hopper housing 20, a photosensitive member 21 rotatably mounted in the waste hopper housing 20, and an end of the process cartridge 1 to which the photosensitive member is not mounted is defined to be directed in the +z direction toward the end to which the photosensitive member is mounted. The image forming apparatus is provided with a force applying member 9 movable in the M direction and in a direction opposite to the M direction, and when the process cartridge 1 is not in operation, the force applying member 9 moves in the M direction and applies a force to the movable member 6, the hopper 3 is urged to rotate about the axis L in the direction indicated by r by the movable member 6, the hopper 3 and the waste hopper 2 are separated, and finally, the photosensitive member 21 and the developing member 32 are out of contact (separated).

When the process cartridge 1 is mounted to the image forming apparatus, the process cartridge 1 is placed upside down as shown in fig. 2, with the state of the process cartridge 1 at this time as a reference, the +z direction is referred to as the lower side, and the-Z direction is referred to as the upper side. The rotation axis of the photosensitive member 21 is located below with respect to the rotation axis of the developing member 32, the force receiving surface 6b1 of the movable member 6 for coupling with the urging member 9 is not facing upward, preferably, the force receiving surfaces 6b1 face +z and +y directions, and the free end 6h of the movable member 6 is not opposed to the urging member 9, so that the urging member 9 does not have to be expanded and contracted nor moved in a direction opposite to the direction indicated by M to avoid interference with the process cartridge 1, only in the direction indicated by M and in a direction opposite to the direction indicated by M, and the structure of the image forming apparatus is simplified; more preferably, when the process cartridge 1 moves in the +z direction, the free end 6h is located in the-Y direction of the urging member 9, not only the movable member 6 does not interfere with the urging member 9, but also the urging member 9 moves in the direction indicated by M to be combined with the movable member 6 when the process cartridge 1 is not in operation, and when the process cartridge 1 is in operation, the urging member 9 moves in the direction opposite to the direction indicated by M to the position before the process cartridge 1 moves in the +z direction, and it can be seen that the moving distance of the urging member 9 is smaller than the moving distance of the urging member 61 in the related art.

FIG. 3 is a partially exploded view of the powder cartridge of the process cartridge according to the present invention; fig. 4 is a perspective view of a movable member in the process cartridge according to the present invention.

The powder hopper 3 further includes a bracket 31, a power receiving member 33, a developing member gear 324 and a supplying member gear 341 mounted on the same side as the second end cap 5, wherein the power receiving member 33 is simultaneously engaged with the developing member gear 324 and the supplying member gear 341, and the power receiving member transmits a driving force received from the outside to the developing member 32 and the supplying member 34 through the developing member gear 324 and the supplying member gear 341 to drive the developing member 32 and the supplying member 34 to rotate; the power receiving member 33, the developing member 32 and the supplying member 34 are supported by the bracket 31, and the developing member gear 324 and the supplying member gear 341 are fixedly mounted at longitudinal ends of the developing member 32 and the supplying member 34, respectively.

Correspondingly, a transmission part is arranged in the powder bin 3 and used for being combined with the movable part 6, when the movable part 6 receives the acting force exerted by the force application part 9, the movable part 6 transmits the acting force to the powder bin 3 through the transmission part, and then the powder bin 3 is forced to be separated from the waste powder bin 2. Specifically, the transmitting portion may be an abutment surface 311 provided on the bracket 31 or an abutment surface provided on the hopper case 30.

Optionally, the powder bin 3 further includes a protecting cover 35 disposed in the +x direction of the bracket, the protecting cover 35 is used to prevent the power receiving member 33, the developing member gear 324 and the supplying member gear 341 from falling off, and the transmitting portion may be an abutment surface 351 disposed on the protecting cover 35.

The arrangement of the abutting surface 311/351 can enable the combination of the movable piece 6 and the powder bin 3 to be smoother, and the abrasion of the movable piece 6 is reduced, so that the abutting surface 311/351 is not required to be arranged, when the abutting surface 311/351 is not arranged, the movable piece 6 is directly combined with the corresponding position of the powder bin 3, and acting force can be transmitted to the powder bin 3, and the purpose of forcing the developing piece 32 and the photosensitive piece 21 to be separated from each other is achieved.

The movable member 6 includes a mounting portion 6a and an acting portion 6b connected to each other, the mounting portion 6a being used to mount the movable member 6, for example, the movable member 6 is mounted in the waste bin 2 by the mounting portion 6a, or is mounted on the first end cap 4, or is mounted on the second end cap 5, hereinafter, the movable member 6 is mounted in the waste bin 2 by the mounting portion 6a as an example.

Further, the movable member 6 is mounted on the photosensitive member 21 by the mounting portion 6a, and the acting portion 6b is formed to protrude from the mounting portion 6a, preferably, the mounting portion 6a is formed with a circle 611 for coupling with the photosensitive member 21, and the acting portion 6b is a flat plate formed to protrude from the mounting portion 6 a. As shown in fig. 2A and 2B, when the movable member 6 is mounted to the photosensitive member 21, both are concentrically arranged, and one surface of the acting portion 6B is formed as a force receiving surface 6B1 for coupling with the urging member 9, the force receiving surface 6B1 may be a smooth surface or a friction member attached to the smooth surface to increase the friction force when coupled with the urging member 9, and the acting portion 6B transmits the urging force to the transmitting portion when the acting portion 6B receives the urging force exerted by the urging member 9.

Further, the movable member 6 is also provided with a restricting member 6f for restricting the rotation of the movable member 6, preventing the action portion 6b (force receiving surface 6b 1) from being unable to reach a predetermined position in an extreme case; preferably, the restriction member 6f is a protrusion protruding radially outwardly from the mounting portion 6a, and the switchable restriction member 6f may also be a protrusion protruding outwardly from the mounting portion 6f along the rotational axis thereof.

In order to make the state change of the process cartridge 1 more clearly revealed, the waste toner hopper 2 in fig. 5A and 5B retains only the photosensitive member 21 and the movable member 6. When the process cartridge 1 is operated, as shown in fig. 5A, the surface of the developing member 32 is in contact with the surface of the photosensitive member 21, and at this time, the urging member 9 is not in contact with the acting portion 6b of the movable member 6, and the acting portion 6b is in contact with the transmitting portion or not.

As described above, the transfer portion may be the transfer surface 311 provided on the holder 31 or the transfer surface 351 provided on the cover 35, and preferably, the transfer surface 311/351 is provided as an inclined surface, as shown in fig. 5A, the transfer surface 311/351 is inclined toward-Y and +z directions, or in other words, the transfer surface 311/351 is gradually away from the developing member 32 in-Y direction.

As shown in fig. 5B, when the process cartridge 1 is not in operation, the urging member 9 gradually approaches the force receiving surface 6B1 in the direction indicated by M, and when the urging member 9 starts to urge the force receiving surface 6B1 to apply an urging force, one surface opposite to the force receiving surface 6B1 comes into contact with the transmitting surface 311/351, the urging force is transmitted to the hopper 3, and finally, the hopper 3 rotates in the direction indicated by r about the axis L to be separated from the waste hopper 2, and at the same time, the developing member 32 and the photosensitive member 21 are also separated from each other.

When the process cartridge 1 is required to start operating again, the urging member 9 moves in the direction opposite to the direction indicated by M to release the urging force on the force receiving surface 6b1, the hopper 3 rotates in the direction opposite to the direction indicated by r by the elastic member located between the hopper 3 and the waste hopper 2 to return to the position where it is close to the waste hopper 2, and at this time, the developing member 32 also returns to the position where it is in contact with the photosensitive member 21.

When the movable member 6 is mounted on the second end cap 5, for example, the second end cap 5 is provided with a fitting portion for fitting with the mounting portion 6a, and when the mounting portion 6a is provided with the circle 611, the fitting portion is a cylinder protruding from the second end cap 5, and the mounting portion 6a is sleeved on the cylinder.

Example two

The same components as those of the first embodiment will be given the same reference numerals, and the difference between them is the structure of the movable member 6, and as shown in fig. 2B, the acting portion 6B includes a first protruding portion 6g1 protruding from the mounting portion 6a and a second protruding portion 6g2 protruding from the first protruding portion, wherein the first protruding portion 6g1 has a first force receiving surface 6B1, and the second protruding portion 6g2 has a second force receiving surface 6B2.

When the process cartridge 1 is placed upside down as shown in fig. 2, neither the first force receiving surface 6b1 nor the second force receiving surface 6b2 faces upward, specifically, the first force receiving surface 6b1 faces downward, and the second force receiving surface 6b2 faces in the +y direction, i.e., the second force receiving surface 6b2 is parallel to the up-down direction (vertical direction) of the process cartridge 1; similarly, the free end 6h (the free end of the second protruding portion 6g 2) of the movable member 6 is not opposed to the urging member 9, and when the process cartridge 1 moves in the +z direction, the free end 6h is located in the-Y direction of the urging member 9, and therefore the urging member 9 does not need to be stretched or moved in the opposite direction to the direction indicated by M to avoid interference with the process cartridge 1, only in the direction indicated by M and in the opposite direction to the direction indicated by M, the structure of the image forming apparatus is simplified, and the moving distance of the urging member 9 is smaller than that of the urging member 61 in the related art.

Example III

The same components of this embodiment as those of the above embodiment will be given the same numbers, and since the movable member 6 is rotatable about its rotation axis, the movable member 6 (the acting portion 6 b) is located at a predetermined force receiving position when the urging member 9 moves toward the movable member 6 (the acting portion 6 b). Preferably, the movable member 6 is always kept coupled to the hopper 3, and as shown in fig. 2A and 2B, the process cartridge 1 further includes a holding member 36 for holding the acting portion 6B (force receiving surface 6B 1) at a predetermined force receiving position.

As shown, the holding member 36 is located between the movable member 6 and the hopper 3 (hopper shell 30) or between the movable member 6 and the waste hopper 2 (hopper shell 20), preferably, the holding member 36 is an elastic member such as a compression spring, a tension spring, an elastic rubber, or the like, and the predetermined force receiving position is a position where the acting portion 6b contacts the transmitting portion, and once the urging member 9 comes into contact with the force receiving surface 6b1, the urging force can be transmitted to the hopper 3; meanwhile, when the process cartridge 1 moves in the +z direction, the acting portion 6b is held at the predetermined force receiving position, and interference between the movable member 6 and the urging member 9 can be effectively prevented.

Example IV

The same components of this embodiment as those of the previous embodiment will be given the same reference numerals, and the above description describes an embodiment in which the first end cap 4 and the second end cap 5 are in the form of separate components, and the powder bin 3 and the waste powder bin 2 are combined by the first end cap 4 and the second end cap 5.

The present embodiment will describe a modification of the first end cap 4 and the second end cap 5 in such a manner that the first end cap 4 is decomposed into two sub-end caps respectively combined with the powder bin 3 and the waste powder bin 2, and the second end cap 5 is also divided into two sub-end caps respectively combined with the powder bin 3 and the waste powder bin 2, and at this time, the sub-end caps respectively combined with the powder bin 3 and the waste powder bin 2 by the first end cap 4 will become a part of the powder bin 3 and a part of the waste powder bin 2, respectively, and correspondingly, the sub-end caps respectively combined with the powder bin 3 and the waste powder bin 2 by the second end cap 5 will become a part of the powder bin 3 and a part of the waste powder bin 2, respectively.

In this embodiment, the powder bin 3 and the waste powder bin 2 are still combined through the first end cover 4 and the second end cover 5, specifically, the powder bin 3 and the waste powder bin 2 are combined through the two sub end covers of the first end cover 4 and the two sub end covers of the second end cover 5, and the combination mode is preferably pin combination, so that the powder bin 3 and the waste powder bin 2 can relatively rotate. Alternatively, the sub-cap of the second end cap 5 to the powder bin may be identical to the protective cap 35, alternatively.

In this embodiment, the movable member 6 may be mounted on one of the waste bin housing 20, the sub-cap where the first end cap 4 is combined with the waste bin, the sub-cap where the second end cap 5 is combined with the waste bin, and the photosensitive member.

As shown in fig. 2A and 2B, the process cartridge 1 further includes a charging member 22 rotatably installed in the waste bin housing 20, the charging member 22 being in contact with the photosensitive member 21 for charging the surface of the photosensitive member 21, and optionally, the mounting portion 6a of the movable member 6 may be mounted on the charging member 22. Further, since both the photosensitive member 21 and the charging member 22 are rotatably mounted in the waste bin housing 20, the photosensitive member 21 and the charging member 22 may be collectively referred to as a rotating member, and the mounting portion 6a of the movable member 6 is mounted on the rotating member in the waste bin 2.

As described above, when the process cartridge 1 is placed upside down, the force receiving surface 6b1 of the movable member 6 for engaging with the urging member 9 provided in the laser printer does not face upward, and therefore, the urging member 9 does not have to be stretched, the movement process thereof is simplified, and correspondingly, the structure of the laser printer is also simplified; further, when the process cartridge 1 moves in the +z direction, the free end 6h of the movable member 6 is not opposed to the urging member 9, and preferably, the free end 6h is located in the-Y direction of the urging member 9, the moving distance of the urging member 9 can be reduced, and the structure of the laser printer can be further simplified; the movable member 6 is movably installed in the process cartridge 1, which not only contributes to simplification of the movement process and the movement distance of the urging member 9 described above, but also contributes to reduction of the chance of breakage of the movable member 6 due to falling or collision of the process cartridge 1.

Claims

1. A process cartridge detachably mounted in an image forming apparatus provided with a force applying member, the process cartridge including a hopper and a waste hopper combined with each other, a movable member movably mounted therein, and a photosensitive member rotatably mounted in the waste hopper and a developing member rotatably mounted in the hopper, the hopper and the waste hopper being brought into close contact with each other when the process cartridge is in operation, the developing member and the photosensitive member being brought into contact with each other, the movable member receiving a force from the force applying member to force the hopper to rotate about an axis L to be separated from each other when the process cartridge is not in operation, the developing member and the photosensitive member being separated from each other;

the movable piece comprises an installation part, an action part and a limiting piece, wherein the installation part and the action part are connected with each other, the limiting piece protrudes from the installation part, the installation part is used for installing the movable piece, the action part is used for receiving the acting force of the force application piece and is abutted with the powder bin, so that the powder bin and the waste powder bin are separated from each other, and the limiting piece is used for limiting the rotation of the movable piece;

designating the end of the processing box, which is not provided with the photosensitive element, to point to the end provided with the photosensitive element in the +Z direction;

it is characterized in that the method comprises the steps of,

when the processing box is placed upside down, the force receiving surface on the movable part for receiving the acting force is not upward facing, and the abutting position of the acting part and the powder bin and the developing part are both positioned in the +Z direction of the axis L.

2. A process cartridge according to claim 1, wherein the free end of the movable member is not opposed to the urging member.

3. A process cartridge according to claim 2, wherein the direction from the hopper to the waste hopper is designated as +y direction, and the opposite is-Y direction, and the free end is located in-Y direction of the urging member when the process cartridge moves in +z direction.

4. A process cartridge according to claim 3, wherein the force receiving surface faces +z and +y directions.

5. A process cartridge according to claim 3, wherein the force receiving surface faces in the +y direction.

6. A process cartridge according to claim 1, further comprising a holding member for holding the force receiving surface in a predetermined force receiving position.

7. A process cartridge according to claim 1, wherein the holding member is located between the movable member and the hopper or between the movable member and the waste hopper.

8. A process cartridge according to claim 1, wherein the acting portion includes a first projecting portion projecting from the mounting portion and a second projecting portion projecting from the first projecting portion, wherein the first projecting portion has a first force receiving surface, and the second projecting portion has a second force receiving surface, and neither the first force receiving surface nor the second force receiving surface faces upward.

9. An image forming apparatus including a main body and a force applying member provided on the main body, wherein the process cartridge according to any one of claims 1 to 8 is detachably mounted on the main body.