A processing box

Abstract

The present invention provides a processing box, comprising a box body, a developing roller, a photosensitive drum, a guide and a reset mechanism, wherein the developing roller is mounted on the box body and is provided with a developing roller gear, the photosensitive drum is mounted on the box body and is provided with a transmission member and a photosensitive drum gear meshing with the developing roller gear, the guide member is mounted on the shaft core of the developing roller or mounted on the box body, and in the axial direction of the photosensitive drum, the guide member is located on the side of the transmission member away from the photosensitive drum, the guide member has a protrusion, the protrusion has a first position and a second position, when the protrusion is in the first position, it can be matched with the peripheral gear of the driving head, the protrusion can be driven from the first position to the second position by the peripheral gear, and when the protrusion is in the second position, the matching connection with the peripheral gear is released, the reset mechanism is connected between the box body and the guide member and is used for forcing the protrusion to move from the second position to the first position, the processing box can reduce the impact on the driving force of the driving head and extend the service life of the driving head.

Description

Technical Field

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

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

[0003] However, since there are many ways to process the processing box in existing electronic photographic imaging devices, in order to improve the versatility of the processing box, the invention patent application with publication number CN110347029A discloses a processing box, which has a two-stage gear at the end of the developing roller. However, it was found in actual use that when the driving force receiving head of the photosensitive drum in the processing box is coupled with the driving head with gears in the electronic photographic imaging device, due to the long length of the driving head, the driving head is prone to swing during the coupling process between the free end of the driving head and the driving force receiving head, making the coupling of the driving force receiving head and the driving head difficult.

[0004] In this regard, the invention patent application with publication number CN115268241A discloses a processing box, which coaxially arranges an idle guide gear on the outer side of the developing roller gear assembly near the end cover, and the guide gear is used to mesh with the peripheral gear of the transmission head in the electronic photographic imaging device to guide and position the transmission head, so that during the installation of the processing box, the second coupling part of the transmission head can be smoothly and accurately engaged with the coupling protrusion at the end of the photosensitive drum, thereby preventing the transmission head of the electronic photographic imaging device and the coupling protrusion of the processing box from being unable to couple due to inaccurate positioning or the transmission head from slipping; however, the processing box has the following shortcomings: during the printing operation of the electronic photographic imaging device, the guide gear always maintains meshing transmission with the peripheral gear of the transmission head, thereby more or less affecting the transmission of driving force, and secondly, it will accelerate the wear of the peripheral gear of the transmission head and shorten the service life of the transmission head. Summary of the Invention

[0005] In order to solve the above problems, a main object of the present invention is to provide a process cartridge that can reduce the influence on the driving force of a driving head in an electrophotographic image forming apparatus and extend the life of the driving head.

[0006] In order to achieve the main purpose of the invention, the present invention provides a processing box, including a box body, a developing roller and a photosensitive drum, the developing roller is rotatably mounted on the box body, the developing roller is provided with a developing roller gear, the photosensitive drum is rotatably mounted on the box body, the photosensitive drum is provided with a transmission member and a photosensitive drum gear, the photosensitive drum gear is meshed with the developing roller gear, wherein the processing box also includes a guide member and a reset mechanism, the guide member is mounted on the shaft core of the developing roller or the guide member is mounted on the box body, in the axial direction of the photosensitive drum, the guide member is located on the side of the transmission member away from the photosensitive drum, the guide member has a protrusion, the protrusion has a first position and a second position, when the protrusion is in the first position, the protrusion can be matched with the peripheral gear of the drive head in the electronic photographic imaging device, the protrusion can be driven by the peripheral gear from the first position to the second position, when the protrusion is in the second position, the protrusion is released from the matching connection with the peripheral gear, the reset mechanism is connected between the box body and the guide member, the reset mechanism is used to force the protrusion to move from the second position to the first position.

[0007] As can be seen from the above, when the process cartridge is installed in an electrophotographic imaging device, the guide member, through its protrusion, cooperates with the peripheral gear of the drive head in the electrophotographic imaging device to position, guide, and support the drive head, allowing the drive head to smoothly and accurately engage with the first coupling portion of the transmission member on the photosensitive drum and / or the developer roller gear on the developer roller, enabling the drive head to stably and reliably drive the photosensitive drum and / or developer roller to rotate, thereby ensuring the stability and reliability of the operation of the process cartridge and the electrophotographic imaging device. The reset mechanism is configured so that when the process cartridge is removed from the electrophotographic imaging device, the reset mechanism can automatically reset the guide member, so that when the process cartridge is reinstalled in the electrophotographic imaging device, the protrusion can still accurately guide and position the drive head.

[0008] A further solution is that a connecting column is provided on the box body; the guide member has an annular portion and a receiving portion, the annular portion is rotatably mounted on the connecting column, and the protrusion and the receiving portion are distributed around the annular portion; the reset mechanism includes a shift rod and a reset elastic member, the shift rod is slidably mounted on the box body, the reset elastic member is connected between the box body and the shift rod, and the reset elastic member can force the shift rod to shift the receiving portion to control the protrusion to rotate along a first direction, and the first direction is the direction in which the protrusion rotates from the second position to the first position.

[0009] As can be seen from the above, the above design enables the reset mechanism to force the protrusion to rotate to the first rotation position when the processing box is taken out from the electronic photographic imaging device, thereby eliminating the need to manually reset the guide member.

[0010] A preferred solution is that a limiting portion is provided on the box body, and along the first direction, the limiting portion is located at the downstream end of the receiving portion; the driving rod has a driving portion, and the driving portion can be adjacent to the receiving portion, and the driving portion has a third position and a fourth position; the reset elastic member forces the driving portion to move to the third position, and when the driving portion is in the third position, the receiving portion is adjacent to the limiting portion and the driving portion; when the protrusion is in the first position, the receiving portion forces the driving portion to remain in the fourth position, and the reset elastic member is in an energy storage state.

[0011] As can be seen from the above, the design of the limiting portion can avoid excessive movement of the protrusion, thereby preventing the protrusion from exceeding the first position and failing to accurately guide and position the drive head; in addition, the above design also enables the receiving portion of the guide member to move the driving portion of the lever to the fourth position when the protrusion is driven from the first position to the second position, so that the reset elastic member can force the driving portion of the lever to move to the third position, so as to drive the protrusion of the guide member to the first position, thereby realizing automatic reset of the guide member.

[0012] A further solution is that the first end of the shift rod extends out of the box body, the shifting portion is formed at the second end of the shift rod and is located inside the box body; the reset elastic member is a compression spring, and the compression spring is arranged between the first end of the shift rod and the box body, or the compression spring is arranged between the second end of the shift rod and the box body.

[0013] As can be seen from the above, the installation position of the reset elastic member can be designed to match the internal space of the process cartridge and the installation space of the process cartridge to ensure that the reset mechanism can accurately reset the guide member.

[0014] Another preferred solution is that the connecting column and the annular portion are interference fit.

[0015] A further solution is that the maximum static friction force between the connecting column and the annular portion is between 0.1 Newton and 30 Newton.

[0016] As can be seen from the above, the above design can prevent the guide member from rotating at will, and can also prevent the guide member from falling off the connecting column.

[0017] A further solution is that when the protrusion is in the first position, a first straight line is formed between the protrusion and its own rotation axis; when the protrusion is in the second position, a second straight line is formed between the protrusion and its own rotation axis; the angle between the first straight line and the second straight line is greater than or equal to 40°.

[0018] As can be seen from the above, the above design enables the protrusion to completely disengage from the mating connection with the peripheral gear of the drive head when the protrusion is in the second position, preventing the protrusion from repeatedly participating in the mating with the peripheral gear, and thereby preventing the protrusion from interfering with the rotation of the drive head.

[0019] A further solution is that the protrusion is a helical tooth or a straight tooth.

[0020] As can be seen from the above, the structure of the protrusion can be adaptively set according to the type of the peripheral gear of the driving head in the electronic photographic imaging device, so that the processing box can be suitable for different types of electronic photographic imaging devices.

[0021] A further solution is that the box body includes a developing frame, a drum frame and a first end cover, the developing roller is mounted on the developing frame, the photosensitive drum is mounted on the drum frame, the first end cover is mounted on the first end wall of the developing frame and connected to the drum frame, the developing roller gear is located between the first end wall and the first end cover, the transmission member and the photosensitive drum gear are located at the same end of the photosensitive drum, and an opening is provided on the side of the first end cover close to the photosensitive drum, and the protrusion can extend from the opening to the outside of the first end cover; in the axial direction, the first distance between the first end face of the protrusion close to the developing roller gear and the outer end face of the first end cover is less than the second distance between the second end face of the developing roller gear close to the protrusion and the outer end face, and the third distance between the third end face of the transmission member close to the outer end face and the outer end face is greater than or equal to the second distance.

[0022] As can be seen from the above, the above design ensures that the guide member can reliably guide and position the drive head, while avoiding interference between the guide member and components such as the developing roller gear and transmission member, thereby ensuring the reliability of the processing box.

[0023] A further solution is that when the protrusion is in the first position, at least a portion of the protrusion is located in the annular area surrounded by the tooth top circle of the peripheral gear and the tooth root circle of the peripheral gear, and a portion of the protrusion extends between two adjacent teeth of the peripheral gear that matches itself; the first position is located in the circumferential direction of the photosensitive drum, a third straight line is formed between the center line of the shaft core and the center line of the photosensitive drum, a fourth straight line is formed between the first position and the center line of the photosensitive drum, and the angle between the fourth straight line and the third straight line is between 0° and 15°.

[0024] As can be seen from the above, the above design enables the protrusion to accurately and reliably cooperate with the peripheral gear of the drive head to accurately guide and position the drive head; in addition, the first position of the protrusion is set along the circumference of the photosensitive drum, so that the guide member has a more flexible position setting condition, and thus the guide member can be flexibly adjusted according to the shape and structure of different box bodies, so that the guide member can be suitable for box bodies of different shapes and structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the first embodiment of the processing box of the present invention.

[0026] Figure 2 This is a structural diagram of the first embodiment of the processing box of the present invention after omitting some components and cooperating with the drive head.

[0027] Figure 3 This is a structural diagram of the first embodiment of the processing box of the present invention after omitting some components and cooperating with the drive head.

[0028] Figure 4 This is a structural diagram of the guide member of the first embodiment of the processing box of the present invention after the third part of the components is omitted and is in the first position.

[0029] Figure 5 It is a structural diagram of the guide member of the first embodiment of the processing box of the present invention.

[0030] Figure 6 1 is a structural diagram of the shift lever of the first embodiment of the process cartridge of the present invention.

[0031] Figure 7 This is a structural diagram of the guide member of the first embodiment of the processing box of the present invention when it is in the second position after the fourth part of the components is omitted.

[0032] Figure 8 Schematic diagram of the relative positions of the first position and the second position of the protrusion of the first embodiment of the processing box of the present invention.

[0033] Figure 9 It is a partial structural diagram of the first embodiment of the processing box of the present invention.

[0034] Figure 10 It is a partial structural diagram of the fifth embodiment of the processing box of the first embodiment of the present invention after omitting some components.

[0035] Figure 11 This is a structural diagram of the second embodiment of the processing box of the present invention with some components omitted.

[0036] Figure 12 It is a structural diagram of the third embodiment of the processing box of the present invention.

[0037] Figure 13 This is a structural diagram of the protrusion in the first position after the first omitted part of the component in the third embodiment of the processing box of the present invention.

[0038] Figure 14 It is a structural diagram of the guide member of the third embodiment of the processing box of the present invention.

[0039] Figure 15 It is a structural diagram of the first end cover of the third embodiment of the processing box of the present invention.

[0040] Figure 16 This is a structural diagram of the protrusion in the second position after the second omitted part of the component in the third embodiment of the processing box of the present invention.

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0042] Process cartridge first embodiment

[0043] Reference Figure 1 The process cartridge 100 includes a cartridge body 1, a developing roller 2, a photosensitive drum 3, a guide member 4, and a reset mechanism 5. The cartridge body 1 preferably includes a developing frame 11, a drum frame 12, a first end cap 13, and a second end cap 14. The developing roller 2 is rotatably mounted on the two end walls of the developing frame 11 of the cartridge body 1 around its own first rotation axis. A developing roller gear 21 is provided on the developing roller 2. The photosensitive drum 3 is rotatably mounted on the two end walls of the drum frame 12 of the cartridge body 1 around its own second rotation axis. A transmission member 31 and a photosensitive drum gear 311 are provided at the first end of the photosensitive drum 3. In this embodiment, the photosensitive drum gear 311 is formed on the transmission member 31, and the end of the transmission member 31 further includes a first coupling portion 312. Of course, in other embodiments, the transmission member 31 and the photosensitive drum gear 311 may be provided independently of each other, and the transmission member 31 and the photosensitive drum gear 311 may be located at the two ends of the photosensitive drum 3.

[0044] The drum frame 12 is connected to the developer roller 2 frame, allowing the developer roller 2 to abut against the photosensitive drum 3 and allowing the developer roller gear 21 to mesh with the photosensitive drum gear 311. The first coupling portion 312 on the transmission member 31 is configured to interface with the second coupling portion 1012 of the drive head 101 within the electrophotographic imaging device, enabling the drive head 101 to drive the photosensitive drum 3 to rotate about the second rotation axis via the transmission member 31. Preferably, both the first coupling portion 312 and the second coupling portion 1012 are generally triangular prism-shaped. A first end cap 13 is mounted on the first end wall of the developer frame 11. The first end cap 13 covers the developer roller gear 21, and the developer roller gear 21 is positioned between the first end wall of the developer roller 2 frame and the first end cap 13 and within the first end cap 13. The first end cap 13 is provided with an opening, allowing a portion of the developer roller gear 21 to be exposed outside the first end cap 13. A second end cap 14 is mounted on the second end wall of the developer roller 2 frame.

[0045] Combine Figures 2 to 4 The guide member 4 is used to guide, position and support the drive head 101, so that after the processing box 100 is installed in the electronic photographic imaging device, the second coupling part 1012 of the drive head 101 can be accurately docked with the first coupling part 312 of the transmission member 31 on the photosensitive drum 3 and / or the peripheral gear 1011 of the drive head 101 can be accurately docked with the developing roller gear 21 on the developing roller 2, and play a certain supporting role for the drive head 101, so that the drive head 101 can stably and reliably drive the photosensitive drum 3 and / or the developing roller 2 to rotate, thereby ensuring the stability and reliability of the processing box 100 and the electronic photographic imaging device.

[0046] Combine Figure 5, the guide member 4 is mounted on the axis of the developing roller 2 or on the box body 1, and in the axial direction of the photosensitive drum 3, the guide member 4 is located on the side of the transmission member 31 away from the photosensitive drum 3. As in the present embodiment, the guide member 4 is mounted on the box body 1, and preferably, a connecting column 131 is provided on the first end cover 13 of the box body 1. The connecting column 131 is preferably coaxially arranged with the axis of the developing roller 2; or the connecting column 131 is staggered with the axis of the developing roller 2, and the connecting column 131 is preferably parallel to the axis of the developing roller 2. The guide member 4 has an annular portion 41, a receiving portion 42 and a protrusion 43, the annular portion 41 is rotatably mounted on the connecting column 131 around the rotation axis of the connecting column 131, and the protrusion 43 is exposed outside the first end cover 13 through the opening of the first end cover 13. Among them, the protrusion 43 and the receiving portion 42 are distributed around the annular portion 41, and the receiving portion 42 is located inside the first end cover 13; the protrusion 43 has a first position (such as Figures 1 to 4 as shown) and the second position (as Figure 7 In addition, the protrusion 43 in this embodiment is a helical tooth; of course, in other embodiments, the protrusion 43 may also be a straight tooth or other shapes.

[0047] Combine Figure 6 The reset mechanism 5 includes a lever 51 and a reset elastic member 52, wherein the lever 51 is slidably mounted on the box body 1, and the reset elastic member 52 is connected between the box body 1 and the lever 51. The reset elastic member 52 can force the lever 51 to shift the shifted portion 42 to control the protrusion 43 to rotate along the first direction R, and the first direction R is the direction in which the protrusion 43 moves from the second position to the first position.

[0048] Preferably, the lever 51 comprises a shifting portion 511, a locking portion 512, and a second limiting portion 513. The first end cap 13 of the box body 1 is provided with a limiting portion 132, a sliding groove 133, and a through hole 134. The limiting portion 132 is located at the downstream end of the shifted portion 42 along the first direction R. The first end of the lever 51 extends from the interior of the first end cap 13 to the exterior of the first end cap 13 through the through hole 134. The shifting portion 511 and the locking portion 512 are both located at the second end of the lever 51. The second limiting portion 513 is formed at the end of the lever 51. The shifting portion 511 can abut against the shifted portion 42. The lever 51 is connected to the slide groove 133 of the first end cover 13 through the engaging portion 512, so that the lever 51 can slide along the slide groove 133, thereby enabling the toggle portion 511 to toggle the guide member 4 to rotate around the connecting column 131 through the toggle portion 42, so as to control the tooth-shaped protrusion 43 of the guide member 4 to move to the first position; the toggle portion 511 has a third position (such as Figures 1 to 4 ) and the fourth position (as shown in Figure 7 shown).

[0049] The reset elastic member 52 is preferably a compression spring. In this embodiment, the compression spring is arranged on the outside of the first end cover 13. The compression spring is sleeved on the shift rod 51 and is located between the second limiting portion 513 and the first end cover 13; wherein the first end of the compression spring abuts against the second limiting portion 513, and the second end of the compression spring abuts against the first end cover 13.

[0050] The reset spring 52 is used to force the shifting portion 511 of the shifting lever 51 to move toward the third position, causing the shifting portion 511 to shift the shifted portion 42 of the guide member 4 toward the stopper 132, thereby driving the protrusion 43 of the guide member 4 toward the first position. When the reset spring 52 drives the shifting portion 511 to the third position, the shifted portion 42 abuts between the shifting portion 511 and the stopper 132. At this point, the stopper 132 prevents the protrusion 43 from moving excessively, preventing it from moving beyond the first position and failing to accurately guide and position the drive head 101.

[0051] When the protrusion 43 of the guide member 4 is driven by the peripheral gear 1011 of the drive head 101 to move toward the second position, the driven portion 42 of the guide member 4 forces the toggle portion 511 to move toward the fourth position, causing the return spring 52 to accumulate energy. When the protrusion 43 is driven to the second position, the driven portion 42 forces the toggle portion 511 to remain in the fourth position, and the return spring 52 is in an energy-accumulating state. Thus, when the protrusion 43 is driven from the first position to the second position, the driven portion 42 of the guide member 4 can move the toggle portion 511 of the toggle lever 51 to the fourth position, thereby causing the return spring 52 to accumulate energy. This ensures that when the process cartridge 100 is removed from the electrophotographic imaging device, the return spring 52 can force the toggle portion 511 of the toggle lever 51 to move toward the third position, driving the protrusion 43 of the guide member 4 to the first position, thereby automatically returning the guide member 4 to its original position.

[0052] Furthermore, an interference fit is employed between the connecting post 131 and the annular portion 41, and the maximum static friction between the connecting post 131 and the annular portion 41 is preferably between 0.1 Newtons and 30 Newtons. This prevents the guide member 4 from rotating freely, thereby ensuring that the protrusion 43 of the guide member 4 can precisely engage and connect with the peripheral gear 1011 of the drive head 101 in the first position, thereby guiding and positioning the drive head 101 and preventing the guide member 4 from detaching from the connecting post 131. Preferably, the maximum static friction between the connecting post 131 and the annular portion 41 is between 0.5 Newtons and 10 Newtons.

[0053] When the process cartridge 100 is installed in the cartridge compartment of the electrophotographic imaging device and the electrophotographic imaging device is first operated, as the drive head 101 rotates, the protrusion 43 of the guide member 4 is driven from the first position to the second position by the shaft gear of the drive head 101. Simultaneously, the guide member 4 drives the lever 51 to the fourth position via the receiving portion 42 and the shifting portion 511 of the shifting lever 51, thereby placing the return spring 52 in an energized state. When the process cartridge 100 is removed from the cartridge compartment of the electrophotographic imaging device, the shifting portion 511 of the shifting lever 51 shifts the receiving portion 42 of the guide member 4 under the action of the elastic potential energy of the return spring 52, causing the protrusion 43 of the guide member 4 to rotate to the first position, thereby automatically returning the guide member 4 to its original position. This allows the protrusion 43 of the guide member 4 to continue to guide, position, and support the drive head 101 when the process cartridge 100 is installed in the cartridge compartment again.

[0054] Combine Figure 8 When the protrusion 43 is in the first position, a first straight line L1 is formed between the protrusion 43 and its own rotation axis; when the protrusion 43 is in the second position (such as Figure 8 The projection 43 and its own rotational axis form a second straight line L2 (shown as the portion indicated by the short dashed line). The angle a between the first straight line L1 and the second straight line L2 is preferably greater than or equal to 40°, so that when the projection 43 is in the second position, the projection 43 can completely disengage from the shaft gear of the drive head 101, thereby preventing friction between the projection 43 and the peripheral gear 1011 of the drive head 101.

[0055] Combine Figure 9 When the protrusion 43 is in the first position, at least a portion of the protrusion 43 is located in the annular area S surrounded by the tooth top circle of the peripheral gear 1011 of the drive head 101 and the tooth root circle of the peripheral gear 1011, and a portion of the protrusion 43 extends between two adjacent teeth of the peripheral gear 1011 that matches itself; wherein, the first position is located in the circumferential direction of the photosensitive drum 3, a third straight line L3 is formed between the center line of the axis core of the developing roller 2 and the center line of the photosensitive drum 3, a fourth straight line L4 is formed between the first position I and the center line of the photosensitive drum 33, and an angle b between the fourth straight line L4 and the third straight line L3 is between 0° and 15°. This design enables the protrusion 43 to accurately and reliably cooperate with the peripheral gear 1011 of the drive head 101 to precisely guide and position the drive head 101; in addition, the first position of the protrusion 43 is set along the circumference of the photosensitive drum 3, so that the guide member 4 has a more flexible position setting condition, and thus the guide member 4 can be flexibly adjusted according to the shape and structure of the different box bodies 1, so that the guide member 4 can be suitable for box bodies 1 with different shapes and structures.

[0056] Combine Figure 10In the axial direction of the photosensitive drum 3, a first distance H1 between the first end surface of the protrusion 43 close to the developing roller gear 21 and the outer end surface of the first end cover 13 is smaller than a second distance H2 between the second end surface of the developing roller gear 21 close to the protrusion 43 and the outer end surface, and a third distance H3 between the third end surface of the transmission member 31 close to the outer end surface and the outer end surface is greater than or equal to the second distance H2.

[0057] It should be noted that, in other embodiments, the guide member 4 can be slidably mounted on the box body 1 (such as the first end cover 13 or the developing frame 11, etc.), so that the protrusion 43 of the guide member 4 can move between the first position and the second position by sliding. When the guide member 4 is slidably mounted on the box body 1, the box body 1 is further provided with a reset mechanism 5 for forcing the protrusion 43 of the guide member 4 to slide and reset from the second position to the first position by sliding.

[0058] In summary, it can be seen that, through the design of the process cartridge, the process cartridge can reduce the impact on the driving force of the drive head in the electronic photographic imaging device and extend the life of the drive head.

[0059] Process cartridge second embodiment

[0060] The difference between this embodiment and the first embodiment of the process cartridge lies in the structure of the lever, the structure of the first end cover and the connection mode of the reset elasticity. Figure 11 The differences are described below. In this embodiment:

[0061] The second limiting portion of the detent rod 61 is cancelled, and the detent rod 61 is formed with a accommodating cavity 611 inwardly from its second end surface toward the first end; the first end cover 62 is provided with a third limiting portion 621 at the slide groove 622, and the third limiting portion 621 extends toward the detent rod 61 along the depth direction of the accommodating cavity 611; the reset elastic member 63 preferably still adopts a compression spring, the first end of the compression spring is located in the accommodating cavity 611 and abuts against the detent rod 61, the second end of the compression spring is sleeved on the third limiting portion 621 and abuts against the first end cover 62, and the third reset elastic member is located on the inner side of the first end cover 62.

[0062] Process cartridge third embodiment

[0063] The difference between this embodiment and the first embodiment of the process cartridge lies in the structure of the guide member, the connection object of the guide member, etc. Specifically, Figures 12 to 16 , in this embodiment:

[0064] The guide member 71 is mounted on the first end cap 72 of the cartridge body. A second connecting post 721 is provided on the first end cap 72. The second connecting post 721 is coaxially arranged with the axis of the developing roller, or the second connecting post 721 is parallel to the axis of the developing roller. The guide member 71 comprises a protrusion 711, a second annular portion 712, and an abutment portion 713. The second annular portion 712 is rotatably mounted on the second connecting post 721. The protrusion 711 is exposed outside the first end cap 72 through an opening in the first end cap 72. The protrusion 711 and the abutment portion 713 are distributed around the second annular portion 712. The abutment portion 713 is located inside and on the inner side of the first end cap 72.

[0065] The reset mechanism is a second reset elastic member connected between the abutment portion 713 and the cartridge body to force the protrusion 711 to rotate toward the first position. Preferably, the second reset elastic member is connected between the first end cover 72 of the cartridge body and the abutment portion 713. The first end cover 72 is provided with a limiting post 722. The second reset elastic member is preferably a torsion spring 73, which is sleeved on the limiting post 722. The first end of the torsion spring 73 is connected to the first end cover 72, and the second end of the torsion spring 73 is connected to the abutment portion 713 of the guide member 71. This allows the second reset elastic member to force the protrusion 711 to rotate toward the first position when the process cartridge is removed from the electrophotographic imaging device, eliminating the need to manually reset the guide member 71.

[0066] Furthermore, the first end cap 72 of the housing is further provided with an elastic limiting portion 723, which extends toward the second annular portion 712 and is elastically deformable in the axial direction of the photosensitive drum. Preferably, the protruding end of the elastic limiting portion 723 has a first guide wedge surface 7231 and a first limiting surface 7232. A fourth limiting portion 714 is provided on the second annular portion 712 of the guide member 71, and the fourth limiting portion 714 has a second guide wedge surface 7141 and a second limiting surface 7142. Along the first direction of rotation of the protrusion 711 from the second position to the first position, the first limiting surface 7232 is located at the upstream end of the first guide wedge surface 7231, the fourth limiting portion 714 is located at the upstream end of the abutment portion 713, and the second guide wedge surface 7141 is located at the upstream end of the second limiting surface 7142. Furthermore, when the protrusion 711 is located at the first position, the first guide wedge surface 7231 is adjacent to the second guide wedge surface 7141 ; and when the protrusion 711 is located at the second position, the first limiting surface 7232 is adjacent to the second limiting surface 7142 .

[0067] This arrangement allows for the fourth limiting portion 714 to force the elastic limiting portion 723 to move inwardly of the first end cap 72 in the axial direction of the developing roller via the first guide wedge surface 7231 and the second guide wedge surface 7141 when the driving head driving protrusion 711 rotates from the first position to the second position. This forces the fourth limiting portion 714 to pass over the end of the elastic limiting portion 723 and compress the torsion spring 73 to store energy. When the protrusion 711 is driven to the second position, the elastic limiting portion 723 moves outwardly of the first end cap 72 in the axial direction of the developing roller to return to its initial position, and the abutting portion 713 of the guide member 71 is forced to rotate toward the first position under the elastic potential energy of the torsion spring 73. When the guide member 71 rotates toward the first position, the second limiting surface 7142 of the fourth limiting portion 714 of the guide member 71 will abut against the first limiting surface 7232 of the elastic limiting portion 723 to limit the protrusion 711 to the second position, and then the elastic limiting portion 723 limits the protrusion 711 from continuing to rotate toward the first position, thereby preventing the protrusion 711 from abutting against the peripheral gear of the drive head, so as to prevent the protrusion 711 and the peripheral gear from wearing each other, thereby extending the service life of the guide member 71 and the drive head.

[0068] When the processing box is taken out from the electronic photographic imaging device, the elastic limiting portion 723 will be pressed by the existing structure of the box magazine of the electronic photographic imaging device (such as the inner side surface of the box magazine) to move toward the inner side of the first end cover 72 in the axial direction of the developing roller, thereby causing the second limiting surface 7142 of the fourth limiting portion 714 of the guide member 71 to be disengaged from the contact with the first limiting surface 7232 of the elastic limiting portion 723. As a result, under the action of the elastic potential energy of the torsion spring 73, the guide member 71 causes the fourth limiting portion 714 to pass over the elastic limiting portion 723, and finally causes the protrusion 711 of the guide member 71 to rotate to the first position to complete the automatic resetting of the protrusion 711. Preferably, the elastic limiting portion 723 is provided with an abutting protrusion 7233, which extends outward from the first end cover 72 in the axial direction of the developing roller. This allows the existing structure in the cartridge compartment to better force the elastic limiting portion 723 to move inward from the first end cover 72 in the axial direction of the developing roller during removal of the process cartridge from the cartridge compartment, thereby ensuring that the fourth limiting portion 714 can pass over the elastic limiting portion 723. Of course, in other embodiments, the elastic limiting portion 723 can also be provided on the developing frame or other components to achieve the same function.

[0069] Preferably, the second annular portion 712 and the second connecting post 721 have an interference fit, and the maximum static friction between the second annular portion 712 and the second connecting post 721 is preferably between 0.1 Newtons and 30 Newtons. This prevents the guide member 71 from rotating freely, thereby ensuring that the protrusion 711 of the guide member 71 can accurately mate with the peripheral gear of the drive head in the first position, thereby guiding and positioning the drive head. More preferably, the maximum static friction between the second annular portion 712 and the second connecting post 721 is preferably between 0.5 Newtons and 10 Newtons.

[0070] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A process cartridge comprising: Box body; A developing roller, the developing roller being rotatably mounted on the box body and provided with a developing roller gear; A photosensitive drum, the photosensitive drum being rotatably mounted on the cartridge body, the photosensitive drum being provided with a transmission member and a photosensitive drum gear, the photosensitive drum gear being engaged with the developing roller gear; It is characterized in that the processing box also includes: The guide member is mounted on the shaft core of the developing roller or the guide member is mounted on the cartridge body. In the axial direction of the photosensitive drum, the guide member is located on the side of the transmission member away from the photosensitive drum. The guide member has a protrusion, and the protrusion has a first position and a second position. When the protrusion is in the first position, the protrusion can be matched with the peripheral gear of the driving head in the electronic photographic imaging device. The protrusion can be driven from the first position to the second position by the peripheral gear. When the protrusion is in the second position, the protrusion is released from the matched connection with the peripheral gear. A connecting column is provided on the cartridge body. The guide member has an annular portion and a receiving portion. The annular portion is rotatably fitted on the connecting column. The protrusion and the receiving portion are distributed around the annular portion. A reset mechanism, the reset mechanism is connected between the box body and the guide member, the reset mechanism is used to force the protrusion to move from the second position to the first position, the reset mechanism includes a shift rod and a reset elastic member, the shift rod is slidably mounted on the box body, the reset elastic member is connected between the box body and the shift rod, the reset elastic member can force the shift rod to shift the shifted portion to control the protrusion to rotate along a first direction, the first direction is the direction of the protrusion rotating from the second position to the first position.

2. The process cartridge according to claim 1, wherein: A limiting portion is provided on the box body, and along the first direction, the limiting portion is located at the downstream end of the shifting portion; The shifting lever has a shifting portion, the shifting portion can be adjacent to the shifted portion, and the shifting portion has a third position and a fourth position; The reset elastic member forces the toggle portion to move toward the third position. When the toggle portion is located at the third position, the toggle portion is adjacent to the limiting portion and the toggle portion. When the protrusion is located at the first position, the shifted portion forces the shifting portion to remain at the fourth position, and the resetting elastic member is in an energy storage state.

3. The process cartridge according to claim 2, wherein: The first end of the shifting rod extends out of the box body, and the shifting portion is formed at the second end of the shifting rod and is located inside the box body; The resetting elastic member is a compression spring, and the compression spring is arranged between the first end of the shifting rod and the box body, or the compression spring is arranged between the second end of the shifting rod and the box body.

4. The process cartridge according to claim 1, wherein: The connecting column and the annular portion are interference fit.

5. The process cartridge according to claim 4, wherein: The maximum static friction force between the connecting column and the annular portion is between 0.1 Newton and 30 Newton.

6. The process cartridge according to any one of claims 1 to 5, wherein: When the protrusion is at the first position, a first straight line is formed between the protrusion and its own rotation axis; When the protrusion is at the second position, a second straight line is formed between the protrusion and its own rotation axis; An angle between the first straight line and the second straight line is greater than or equal to 40°.

7. The process cartridge according to any one of claims 1 to 5, wherein: The protrusion is a helical tooth or a straight tooth.

8. The process cartridge according to any one of claims 1 to 5, wherein: The cartridge body includes a developing frame, a drum frame, and a first end cover, wherein the developing roller is mounted on the developing frame, the photosensitive drum is mounted on the drum frame, the first end cover is mounted on a first end wall of the developing frame and connected to the drum frame, the developing roller gear is located between the first end wall and the first end cover, the transmission member and the photosensitive drum gear are located at the same end of the photosensitive drum, an opening is provided on a side of the first end cover close to the photosensitive drum, and the protrusion can extend from the opening to the outside of the first end cover; In the axial direction, a first distance between a first end face of the protrusion close to the developing roller gear and an outer end face of the first end cover is smaller than a second distance between a second end face of the developing roller gear close to the protrusion and the outer end face, and a third distance between a third end face of the transmission member close to the outer end face and the outer end face is greater than or equal to the second distance.

9. The process cartridge according to any one of claims 1 to 5, wherein: When the protrusion is in the first position, at least a portion of the protrusion is located within the annular area enclosed by the addendum circle of the peripheral gear and the root circle of the peripheral gear, and a portion of the protrusion extends between two adjacent teeth of the peripheral gear with which the protrusion is matched; The first position is located on the circumference of the photosensitive drum, a third straight line is formed between the center line of the shaft core and the center line of the photosensitive drum, a fourth straight line is formed between the first position and the center line of the photosensitive drum, and the angle between the fourth straight line and the third straight line is between 0° and 15°.

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