Process cartridge

Abstract

This invention provides a processing box, comprising a drum box with a photosensitive drum, a developing box with a developing roller, and a pusher located between the drum box and the developing box. The developing box is rotatably connected to the drum box. The pusher is used to force the developing roller and the photosensitive drum closer together or into contact. The processing box has a first state without the pusher and a second state with the pusher installed. In the first state, the photosensitive drum can rotate about a first rotation axis, and the developing roller can rotate about a second rotation axis, the first rotation axis being parallel to the second rotation axis. In the second state, the developing roller can rotate about a fourth rotation axis, and the photosensitive drum can rotate about a third rotation axis, the third rotation axis being parallel to the fourth rotation axis. The fourth rotation axis is inclined relative to the first rotation axis. Thus, even if the pushing force of the pusher is too large, the developing roller can be slightly moved to prevent deformation, ensuring image quality.

Description

Technical Field

[0001] This invention relates to the field of electrophotographic imaging technology, and more particularly to a processing box that can be detachably installed into an electrophotographic imaging device. Background Technology

[0002] The processing cartridge includes a photosensitive drum and a developing roller rotatably disposed therein. The developing roller supplies developer to the photosensitive drum to develop an electrostatic latent image formed on the surface of the photosensitive drum, which is then transferred from the surface of the photosensitive drum to the recording material. During this process, the developing roller and the photosensitive drum approach or contact each other. The processing cartridge is also provided with two elastic members for bringing the developing roller and the photosensitive drum close to or contacting each other. The two elastic members are located at opposite ends of the processing cartridge along a direction parallel to the rotation axis of the developing roller.

[0003] The developing roller is housed in the developing housing, and the photosensitive drum is housed in the drum housing. An elastic element is located between the developing housing and the drum housing so that the developing housing and the drum housing rotate around a preset rotation axis. To prevent the developing roller and the photosensitive drum from separating from each other, the elastic force of the elastic element is set to be relatively large. This setting may cause the developing roller, which has relatively low overall hardness, to easily deform, thereby producing imaging defects and affecting the imaging quality. Summary of the Invention

[0004] In view of the above, the present invention provides a processing box employing the following technical solution to solve at least one of the aforementioned technical problems. The specific technical solution is as follows:

[0005] The processing box includes:

[0006] A drum housing includes a drum shell and a photosensitive drum rotatably disposed within the drum shell, the surface of which has an electrostatic latent image formed.

[0007] The developing cartridge, rotatably connected to the drum, includes a developing housing and a developing roller rotatably disposed in the developing housing. The developing housing contains developer, and the developing roller carries the developer and supplies it to the photosensitive drum, thereby developing an electrostatic latent image.

[0008] The pusher, located between the drum and the developing drum, is used to force the developing roller and the photosensitive drum closer together or into contact with each other;

[0009] The processing box has a first state and a second state. In the first state, the processing box is not equipped with a pusher, the photosensitive drum can rotate around a first rotation axis, and the developing roller can rotate around a second rotation axis. The first rotation axis is parallel to the second rotation axis, and the first and second rotation axes are arranged along a first direction. In the second state, the processing box is equipped with a pusher, the developing roller can rotate around a fourth rotation axis, and the photosensitive drum can rotate around a third rotation axis. The third rotation axis is parallel to the fourth rotation axis. The fourth rotation axis is inclined relative to the first rotation axis.

[0010] In some implementations, in a first state, projection is made along a second rotation axis, which forms a first projection point; in another state, projection is made along a fourth rotation axis, which forms a second projection point.

[0011] Along the first direction, the distance between the first projection point and the third projection point is less than the distance between the second projection point and the third projection point.

[0012] In some implementations, the distance between the first projection point and the second projection point along the first direction ranges from 0.3 mm to 0.7 mm.

[0013] In some implementations, the distance between the first projection point and the second projection point along the first direction is set to 0.45 mm.

[0014] In some embodiments, the developing roller includes a developing roller body, a first supported member and a second supported member. The developing roller body is used to carry the developer. Along the rotation axis of the developing roller, the two ends of the developing roller body are respectively connected to the first supported member and the second supported member. Furthermore, the length of the first supported member protruding from the developing roller body is greater than the length of the second supported member protruding from the developing roller body.

[0015] In some embodiments, in the second state, the rotation axis of the first supported member is collinear with the rotation axis of the developing roller.

[0016] In some embodiments, the developing roller includes a developing roller body and a first supported member, one end of the developing roller body being connected to the first supported member such that the developing roller body is supported by the first supported member, and the hardness of the first supported member is not greater than the hardness of the developing roller body.

[0017] In some embodiments, the first supported member is made of plastic injection molding, and the developing roller body is made of metal.

[0018] In some embodiments, the developing roller includes a developing roller body for carrying developer, and the developing cartridge also includes a seal located between the developing roller body and the developing housing for preventing developer leakage. In both a first state and a second state, the developing roller body and the seal remain in contact.

[0019] Along the first direction, the rotation axis of the developing roller is located between the contact position between the seal and the developing roller body and the rotation axis of the photosensitive drum. When the processing cartridge transitions from the first state to the second state, the developing roller moves in a direction away from the first rotation axis.

[0020] In some embodiments, when the processing cartridge transitions from a first state to a second state, along a first direction, the end of the developing roller where the first supported member is disposed moves away from the end where the second supported member is disposed in a direction away from the first axis of rotation.

[0021] Compared with the prior art, the present invention configures the processing cartridge to be able to switch between a first state and a second state. In the second state, the rotation axis of the developing roller and the rotation axis of the photosensitive drum are both inclined relative to the rotation axis of the photosensitive drum in the first state, and the developing housing and the drum housing are rotatably connected. Regardless of the state of the processing cartridge, the developing roller and the photosensitive drum always remain in contact or close to each other. Even if the pushing force of the pushing member is too large, causing the first support member to deform, the rotation axis of the developing roller body can be collinear with the rotation axis of the first supported member by slight movement of the first supported member, so as to ensure imaging quality. Attached Figure Description

[0022] Figure 1 This is a perspective view of the processing box involved in the present invention.

[0023] Figure 2 It is along Figure 1 Plan view after sectioning along the CC direction.

[0024] Figure 3A This is an exploded view of the processing box involved in the present invention.

[0025] Figure 3B This is a perspective view of the developing cartridge involved in this invention.

[0026] Figure 4 This is a perspective view of the developing roller of the developing cartridge involved in this invention.

[0027] Figure 5 This is a perspective view of the first end cap of the developing cartridge involved in this invention.

[0028] Figure 6 This is a perspective view of the second end cap of the developing cartridge involved in this invention.

[0029] Figure 7This is a schematic diagram of the contact position between the photosensitive drum and the developing roller in the processing cartridge of the present invention.

[0030] Figure 8 This is a plan view of the processing box of the present invention when viewed in different states along a direction perpendicular to both the rotation axis of the photosensitive drum and the first direction.

[0031] Figure 9 This is a plan view of the first end cap of the developing cartridge involved in this invention, viewed along the axis of rotation of the developing roller.

[0032] Figure 10 This is the test page for the existing processing box.

[0033] Figure 11 This is the test page of the processing box involved in this invention. Detailed Implementation

[0034] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] [Processing Box]

[0036] The processing box 10 is detachably mounted to an electrophotographic imaging device (hereinafter referred to as the "imaging device"), such as... Figure 1 As shown, the processing cartridge 10 includes a developing cartridge 1 and a drum cartridge 2 that are rotatably connected.

[0037] like Figure 1 , Figure 2 and Figure 3A As shown, the drum housing 2 includes a drum shell 21 and a photosensitive drum 22 rotatably disposed in the drum shell 21. The surface of the photosensitive drum 22 is used to form an electrostatic latent image. The developing cartridge 1 includes a developing shell 11 and a developing roller 12 rotatably disposed in the developing shell 11. Before the following pusher 10a is installed in the processing cartridge 10, the photosensitive drum 22 and the developing roller 12 are arranged along a first direction. Specifically, the rotation axis of the photosensitive drum 22 and the rotation axis of the developing roller 12 are arranged along the first direction. The developing shell 11 contains a developer, and the developing roller 12 is used to carry the developer and supply the developer to the photosensitive drum 22, so that the electrostatic latent image is developed.

[0038] (Forced push)

[0039] After the processing cartridge 10 is installed into the imaging device, during the imaging operation, the developing roller 12 and the photosensitive drum 22 approach or contact each other so that developer can be supplied from the developing roller 12 to the photosensitive drum 22; for example Figure 1 and Figure 3AAs shown, the processing box 10 also includes a pushing member 10a for forcing the developing roller 12 and the photosensitive drum 22 to approach or contact each other. The pushing member 10a is located between the drum box 2 and the developing box 1. Under the pushing action of the pushing member 10a, at least one of the developing box 1 and the drum box 2 rotates so that the developing roller 12 and the photosensitive drum 22 approach or contact each other.

[0040] In some embodiments, the pusher 10a is configured as an elastic element.

[0041] In some embodiments, the pusher 10a is disposed on the drum housing 2, for example, on the drum shell 21 or the drum side cover 23 described below.

[0042] In some embodiments, the pusher 10a is disposed on the developing cartridge 1, for example, on the developing housing 11 or on the first end cap 13 and the second end cap 14 described below.

[0043] (Drive force receiving component)

[0044] like Figure 3A As shown, the processing box 10 is provided with a driving force receiving component 10b for receiving driving force from the imaging device. Along the rotation axis of the developing roller 12, one end of the driving force receiving component 10b is a driving end and the other end is a non-driving end. The driving force is used to drive the photosensitive drum 22 and the developing roller 12 to rotate. Specifically, the driving force receiving component 10b includes a first driving force receiving element 10b1 and a second driving force receiving element 10b2. The first driving force receiving element 10b1 is used to cooperate with the photosensitive drum 22 so that the driving force can be transmitted to the photosensitive drum 22, thereby driving the photosensitive drum 22 to rotate. The second driving force receiving element 10b2 is used to cooperate with the developing roller 12 so that the driving force can be transmitted to the developing roller 12, thereby driving the developing roller 12 to rotate.

[0045] In some embodiments, both the first driving force receiver 10b1 and the second driving force receiver 10b2 receive the driving force directly from the imaging device.

[0046] In some embodiments, the first driving force receiver 10b1 receives driving force directly from the imaging device, and the second driving force receiver 10b2 can receive driving force from the first driving force receiver 10b1 or directly from the imaging device.

[0047] In some embodiments, the processing box 10 may also provide at least one intermediate transmission member between the first driving force receiver 10b1 and the second driving force receiver 10b2, wherein the first driving force receiver 10b1 transmits the driving force to the intermediate transmission member, and the intermediate transmission member then transmits the driving force to the second driving force receiver 10b2.

[0048] In some embodiments, the first driving force receiver 10b1, the second driving force receiver 10b2, and the intermediate transmission member are all configured as gears.

[0049] In some implementations, such as Figure 1 and Figure 3A As shown, the drum housing 2 is also provided with a drum side cover 23. Along the rotation axis of the photosensitive drum 23, the drum side cover 23 is connected to the drum housing 21. Along the rotation axis of the photosensitive drum 22, the drum side cover 23 and the first driving force receiver 10b1 are located on the same side of the drum housing 2. A portion of the first driving force receiver 10b1 is exposed to the outside of the drum housing 2 through a hole provided on the drum side cover 23, so that the first driving force receiver 10b1 can receive driving force from the imaging device.

[0050] In some embodiments, the drum side cover 23 is integrally formed with the drum shell 21.

[0051] like Figure 1 and Figure 3A As shown, the developing cartridge 1 includes a first end cap 13 and a second end cap 14 that are spaced apart and opposite to each other along the rotation axis of the developing roller 12. The first end cap 13 and the second end cap 14 are respectively connected to the developing housing 11 along the rotation axis of the developing roller 12. The first end cap 13 and the second driving force receiving member 10b2 are disposed on the same side of the developing cartridge 1.

[0052] In some embodiments, a portion of the second driving force receiver 10b2 is exposed outside the developing cartridge 1 through a hole provided on the first end cap 13, so that the second driving force receiver 10b2 can receive driving force from the imaging device.

[0053] (Developing roller)

[0054] like Figure 3A and Figure 4 As shown, the developing roller 12 includes a developing roller body 121, a first supported member 122, and a second supported member 123. The developing roller body 121 is used to carry the developer. Along the rotation axis of the developing roller 12, the two ends of the developing roller body 121 are connected to the first supported member 122 and the second supported member 123 respectively, so that the developing roller body 121 is supported by the first supported member 122 and the second supported member 123. The second driving force receiving member 10b2 is combined with the first supported member 122, so that the driving force can be transmitted from the second driving force receiving member 10b2 to the first supported member 122 and the developing roller body 121.

[0055] In some embodiments, the hardness of the first supported member 122 is not greater than the hardness of the developing roller body 121. For example, the first supported member 122 is made of plastic and the developing roller body 121 is made of metal (e.g., aluminum).

[0056] In some embodiments, the first supported member 122 is used to support the second driving force receiver 10b2.

[0057] In some embodiments, at least a portion of the first supported member 122 and at least a portion of the second supported member 123 are both configured as cylindrical.

[0058] In some embodiments, along the rotation axis of the developing roller 12, the length of the first supported member 122 protruding from the developing roller body 121 is greater than the length of the second supported member 123 protruding from the developing roller body 121.

[0059] Specifically, such as Figure 3A and Figure 4 As shown, the first supported member 122 includes a first supported portion 122a and a first connecting portion 122b connected along the rotation axis of the developing roller 12. The first connecting portion 122b is used to connect with the developing roller body 121. The second driving force receiving member 10b2 is combined with the first supported portion 122a. At least a portion of the first supported portion 122a (e.g., the end portion of the first supported portion 122a away from the developing roller body 121) is used to connect with the first support member 15 below (e.g., ...). Figure 5 The first supported member 122 is rotatably supported in conjunction with the second supported member 123, which includes a second supported portion 123a and a second connecting portion 123b connected along the rotation axis of the developing roller 12. The second connecting portion 123b is used to connect with the developing roller body 121. At least a portion of the second supported portion 123a (e.g., the end portion of the second supported portion 123a away from the developing roller body 121) is used to connect with the second supported member 16 below (as shown). Figure 6 (as shown) cooperates with the second supported member 123 so that it can be rotatably supported.

[0060] like Figure 5 As shown in Figure 6, the developing cartridge 1 is also provided with a first support member 15 for supporting the first supported member 122 / first supported portion 122a and a second support member 16 for supporting the second supported member 123 / second supported portion 123a.

[0061] In some embodiments, the first support member 15 is disposed on the first end cap 13, and the second support member 16 is disposed on the second end cap 14.

[0062] When the pushing member 10a applies a pushing force to the developing cartridge 1 and the drum cartridge 2, the developing roller 12 and the photosensitive drum 22 approach or contact each other. Along the radial direction of the photosensitive drum 22, or along the radial direction of the developing roller 12, at the driving end, the pushing force transmitted by the pushing member 10a to the photosensitive drum 22 is transmitted directly or indirectly to the first support member 15 through the first supported member 122. At the non-driving end, the pushing force transmitted by the pushing member 10a to the photosensitive drum 22 is transmitted directly or indirectly to the second support member 16 through the second supported member 123.

[0063] Taking the direct contact of the photosensitive drum 22 with the first connecting part 122b and the direct contact of the photosensitive drum 22 with the second connecting part 123b as examples, Figure 7 As shown, the photosensitive drum 22 abuts against the first connecting part 122b at the first contact point D1, the first supported part 122a is supported by the first support member 15 at the first support point R1, the photosensitive drum 22 abuts against the second connecting part 122b at the second contact point D2, and the second supported part 123a is supported by the second support member 16 at the second support point R2. Along the rotation axis of the developing roller 121, the distance between the first contact point D1 and the first support point R1 is the first distance H1, and the distance between the second contact point D2 and the second support point R2 is the second distance H2. The first distance H1 is greater than the second distance H2.

[0064] In some embodiments, at least a portion of the second support member 16 may enter the second supported portion 123a, in which case the second contact point D2 and the second support point R2 coincide.

[0065] (Seals)

[0066] like Figure 3A and Figure 3B As shown, the developing cartridge 1 is also provided with two seals 17 located between the developing housing 11 and the developing roller 12 / developing roller body 121. Along the rotation axis of the developing roller 12, the two seals 17 are located at both ends of the developing roller body 121, and both seals 17 are in contact with the developing roller body 121. The seals 17 are used to prevent developer leakage from both ends of the developing roller body 121. In some embodiments, the seals 17 are made of sponge or felt.

[0067] [The first and second states of the processing box]

[0068] Processing box 10 can be in the first state (e.g.) Figure 8 B) and the second state (such as Figure 8C) In the transition between states, in the first state, the processing cartridge 10 is not equipped with the pusher 10a, the photosensitive drum 22 can rotate around the first rotation axis P1, and the developing roller 121 can rotate around the second rotation axis L1, with the first rotation axis P1 and the second rotation axis L1 being parallel; in the second state, the processing cartridge 10 is equipped with the pusher 10a, the photosensitive drum 22 can rotate around the third rotation axis P2, and the developing roller 121 can rotate around the fourth rotation axis L2, with the third rotation axis P2 and the fourth rotation axis L2 being parallel; the fourth rotation axis L2 is inclined / not parallel to the first rotation axis P1, that is, the fourth rotation axis L2 intersects the first rotation axis P1, and the fourth rotation axis L2 also intersects the second rotation axis L1.

[0069] Along the first direction, the developing roller 121 is located between the seal 17 and the photosensitive drum 22. Specifically, the second rotation axis L2 is located between the contact position of the seal 17 and the developing roller 121 and the first rotation axis P1, or along the rotation axis of the photosensitive drum 22 pointing to the rotation axis of the developing roller 12. The rotation axis of the photosensitive drum 22, the rotation axis of the developing roller 12, and the seal 17 are distributed in sequence. When the processing cartridge 10 transitions from the first state to the second state, the developing roller 12 moves in a direction away from the first rotation axis P1.

[0070] In some embodiments, when the processing cartridge 10 transitions from a first state to a second state, the portion of the developing roller 12 located at the drive end moves in a direction away from the first rotation axis P1 relative to the portion located at the non-drive end along a first direction.

[0071] like Figure 9 As shown, in the first state, the rotation axis of the developing roller 121 (i.e., the second rotation axis L1) forms a first projection point Q on the first end cover 13 along the direction of the rotation axis, and the rotation axis of the photosensitive drum 22 (i.e., the first rotation axis P1) forms a third projection point E along the direction of the rotation axis. In the second state, the rotation axis of the developing roller 121 (i.e., the fourth rotation axis L2) forms a second projection point B on the first end cover 13 along the direction of the rotation axis. Along the first direction, the distance between the first projection point Q and the first rotation axis P1 is less than the distance between the second projection point B and the first rotation axis P1, or the distance between the first projection point Q and the third projection point E is less than the distance between the second projection point B and the third projection point E.

[0072] like Figure 9As shown, along the first direction, the distance between the first projection point Q and the second projection point B is the third distance H3. The size range of the third distance H3 is 0.3mm to 0.7mm. Preferably, the third distance H3 is set to 0.45mm. With this setting, in the second state, both the developing roller 121 and the first supported member 122 of the processing box 10 rotate around the fourth rotation axis L2. That is, under the pushing action of the pushing member 10a, the first supported member 122 will not deform. During the rotation of the developing roller 12 and the photosensitive drum 22, the distance between the radial outer surface of the developing roller 121 and the radial outer surface of the photosensitive drum 22 will not change.

[0073] [Explanation of the origin of the defect and how to overcome it]

[0074] When the hardness of the first support member 122 is not greater than the hardness of the developing roller body 121, the first support member 122 is prone to defects because the first distance H1 is greater than the second distance H2. Figure 8 The deformation shown in Figure A causes the rotation axis of the developing roller 121 to be out of sync with the rotation axis of the first support member 122, resulting in... Figure 10 The defect A shown is an irregular horizontal white bar on the test page. Since the first support member 122 is located at the drive end, the horizontal white bar defect on the test page gradually decreases from the position corresponding to the drive end of the processing box 10 to the position corresponding to the non-drive end of the processing box 10.

[0075] In this application, when the processing box 10 is equipped with the pusher 10a, the processing box 10 changes from the first state to the second state. It should be understood that, for ease of understanding, regardless of... Figure 8 The deformation range of the first support member 122 shown in Figure A is still... Figure 8 The tilt angles of the developing roller 12 and the photosensitive drum 22 shown in C are much greater than the deformation range and tilt angle in the actual product. In other words, in the second state of the processing cartridge 10 using the technical solution of this application, although the developing roller 12 and the photosensitive drum 22 are tilted, the tilted developing roller 12 and the photosensitive drum 22 are still in contact with each other or close to each other, and the actual tilt angle will not affect the formation of complete and correct text or images on the imaging medium by the processing cartridge 10.

[0076] As described above, at the drive end of the processing cartridge 10, taking the rotation axis P1 of the photosensitive drum 22 when the processing cartridge 10 is in the first state as a reference, compared to the second rotation axis L1 of the developing roller 12 when the processing cartridge 10 is in the first state, the fourth rotation axis L2 of the developing roller 12 is further away from the first rotation axis P1 when the processing cartridge 10 is in the second state. At the same time, the first support member 122 also moves a distance H3 away from the first rotation axis P1. Finally, the developing roller 12 forms... Figure 8In the posture shown in Figure C, the rotation axis of the developing roller 121 is substantially collinear with the rotation axis of the first support member 122, as shown in Figure C. Figure 11 As shown, the test page will no longer display... Figure 10 Defect A is shown.

[0077] [Beneficial Effects]

[0078] Compared with the prior art, the processing box 10 provided by the present invention has the following beneficial effects:

[0079] Firstly, by configuring the processing cartridge 10 to be able to switch between a first state and a second state, in the second state, the rotation axis of the developing roller 12 and the rotation axis of the photosensitive drum 22 are both inclined relative to the rotation axis of the photosensitive drum 22 in the first state, and the developing housing 11 and the drum housing 21 are rotatably connected. Therefore, regardless of the state of the processing cartridge 10, the developing roller 12 and the photosensitive drum 22 always remain in contact with or close to each other. Even if the pushing force of the pushing member 10a is too large, causing the first support member 122 to deform, the slight movement of the first supported member 122 in the first support member 15 can make the rotation axis of the developing roller body 121 collinear with the rotation axis of the first supported member 122, thereby overcoming the above-mentioned defect A.

[0080] Secondly, the processing box 10 is configured to switch between a first state and a second state, and can further increase the pushing force of the pushing member 10a, so that the first driving force receiver 10b1 and the second driving force receiver 10b2 remain stably connected, preventing the transmission of driving force from being interrupted due to the first driving force receiver 10b1 and the second driving force receiver 10b2 disengaging, or the first driving force receiver 10b1 and the second driving force receiver 10b2 changing between connection and disengagement, resulting in the appearance of periodic horizontal white streaks in the imaging medium.

[0081] Thirdly, compared to the first state, when the processing cartridge 10 is in the second state, the contact between the developing roller body 121 and the seal 17 can become tighter. In this way, the pushing force transmitted from the pushing member 10a to the developing roller 12 can be partially consumed by the seal 17, further reducing the possibility of deformation of the first supported member 122, thereby making the developing roller 12 rotate more stably in the developing housing 11.

Claims

1. A processing box, characterized in that, include: A drum housing includes a drum shell and a photosensitive drum rotatably disposed within the drum shell, the surface of which has an electrostatic latent image formed. The developing cartridge, rotatably connected to the drum, includes a developing housing and a developing roller rotatably disposed in the developing housing. The developing housing contains developer, and the developing roller carries the developer and supplies it to the photosensitive drum, thereby developing an electrostatic latent image. The pusher, located between the drum and the developing drum, is used to force the developing roller and the photosensitive drum closer together or into contact with each other; The processing box has a first state and a second state. In the first state, the processing box is not equipped with a pusher, the photosensitive drum can rotate around a first rotation axis, and the developing roller can rotate around a second rotation axis. The first rotation axis is parallel to the second rotation axis, and the first and second rotation axes are arranged along a first direction. In the second state, the processing box is equipped with a pusher, the developing roller can rotate around a fourth rotation axis, and the photosensitive drum can rotate around a third rotation axis. The third rotation axis is parallel to the fourth rotation axis. The fourth rotation axis is inclined relative to the first rotation axis.

2. The processing box according to claim 1, characterized in that, In the first state, projection is made along the second rotation axis, and the second rotation axis forms the first projection point. Projection is also made along the first rotation axis, and the first rotation axis forms the third projection point. In the second state, projection is made along the fourth rotation axis, and the fourth rotation axis forms the second projection point. Along the first direction, the distance between the first projection point and the third projection point is less than the distance between the second projection point and the third projection point.

3. The processing box according to claim 2, characterized in that, Along the first direction, the distance between the first projection point and the second projection point ranges from 0.3 mm to 0.7 mm.

4. The processing box according to claim 3, characterized in that, Along the first direction, the distance between the first projection point and the second projection point is set to 0.45 mm.

5. The processing box according to claim 2, characterized in that, The developing roller includes a developing roller body, a first supported member, and a second supported member. The developing roller body is used to carry the developing agent. Along the rotation axis of the developing roller, the two ends of the developing roller body are respectively connected to the first supported member and the second supported member. Furthermore, the length of the first supported member protruding from the developing roller body is greater than the length of the second supported member protruding from the developing roller body.

6. The processing box according to claim 5, characterized in that, In the second state, the rotation axis of the first supported member is collinear with the rotation axis of the developing roller.

7. The processing box according to claim 2, characterized in that, The developing roller includes a developing roller body and a first supported member. One end of the developing roller body is connected to the first supported member so that the developing roller body is supported by the first supported member. The hardness of the first supported member is not greater than the hardness of the developing roller body.

8. The processing box according to claim 7, characterized in that, The first supported member is made of plastic injection molding, and the developing roller body is made of metal.

9. The processing box according to claim 1, characterized in that, The developing roller includes a developing roller body for carrying developer, and the developing cartridge also includes a seal located between the developing roller body and the developing housing. The seal is used to prevent developer leakage. In both the first and second states, the developing roller body and the seal remain in contact. Along the first direction, the rotation axis of the developing roller is located between the contact position between the seal and the developing roller body and the rotation axis of the photosensitive drum. When the processing cartridge transitions from the first state to the second state, the developing roller moves in a direction away from the first rotation axis.

10. The processing box according to claim 5, characterized in that, When the processing box transitions from the first state to the second state, along the first direction, the end of the developing roller where the first supported member is located moves away from the first rotation axis relative to the end where the second supported member is located.

Images