Processing box with counting gear

Abstract

The processing box with the counting gear comprises a shell, a gear end cover, a counting gear assembly and a driving gear, the counting gear assembly comprises a gear support rotatably arranged on the end wall of the shell; the counting gear is rotatably arranged on the gear support and can move outwards or inwards in the axial direction of the counting gear; the gear support rotates to drive the counting gear to move between the meshing position and the separating position. The limiting sliding block is arranged on the end wall of the shell in an up-down moving mode, and when the limiting sliding block moves upwards, the top of the limiting sliding block can be exposed out of the gear end cover; the separation shifting block is rotatably arranged on the limiting sliding block and is provided with a limiting convex part; a holder return spring for moving the gear holder from the disengaged position to the engaged position; the sliding block reset spring enables the limiting sliding block to move upwards; the shifting block reset spring enables the separation shifting block to move towards the limiting position; and the compression spring enables the counting gear to be close to the end wall of the shell along the axial direction of the counting gear. According to the invention, the counting gear can be automatically reset.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic imaging photography, and in particular relates to a processing box with a counting gear assembly used in an image forming device. Background Art

[0002] Image forming devices such as laser printers and copiers usually have an image processing unit and a developing unit. The electrostatic latent image formed on the image processing unit is developed using a developer such as toner provided by the developing unit to form a visible image on a medium such as paper. The developing unit includes a processing box, which is a box that can be detachably installed in the main body of the image forming device. The processing box includes a powder bin for containing the developer. In order to facilitate users to judge the service life of the processing box, some processing boxes are provided with a counting gear, which can cooperate with the detection mechanism on the image forming device. When the processing box is installed and used, the image forming device resets the preset life value inside the image forming device by identifying the counting gear on the processing box. When the number of pages printed by the processing box reaches the preset life value, it is considered that the developer in the processing box has been consumed and the processing box needs to be replaced to continue printing.

[0003] However, for some large-capacity processing cartridges, the amount of developer loaded is greater than the capacity of the standard processing cartridge, and the preset life value of the image forming device is usually set according to the capacity of the standard processing cartridge and cannot be changed. When the number of printed pages reaches the preset life value, the image forming device prompts that the developer has been consumed, and the processing cartridge cannot be used further, which will result in the developer in the large-capacity processing cartridge not being fully used and causing waste. In addition, for some processing cartridges that can be refilled with developer, since the counting gear cannot be reset, even if the developer is refilled, the processing cartridge cannot be reused, which increases the user's cost of use. Summary of the invention

[0004] The object of the present invention is to provide a processing box in which a counting gear can be automatically reset.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A processing box with a counting gear comprises a shell, a gear end cover arranged on the outer side of one end of the shell, a counting gear assembly covered by the gear end cover, and a driving gear; the counting gear assembly comprises: a gear bracket rotatably arranged on the end wall of the shell around a first axis; a counting gear with a full-tooth structure rotatably arranged on the gear bracket around a second axis, and the counting gear can move outward or inward along its own axis; when the gear bracket rotates, it drives the counting gear to move between a meshing position and a separation position, in which the counting gear and the driving gear are meshed, and in the separation position, the counting gear and the driving gear are separated; a gear bracket movably arranged on the shell up and down A limiting slider on the end wall of the body, the top of which can be exposed from the gear end cover when the limiting slider moves upward; a separation block rotatably arranged on the limiting slider, the separation block having a limiting convex portion, the separation block can rotate between an initial position and a limiting position, and when in the limiting position, the limiting convex portion limits the rotation of the counting gear and separates the counting gear from the driving gear; a bracket reset spring that moves the gear bracket from the separation position to the meshing position; a slider reset spring that moves the limiting slider upward; a block reset spring that moves the separation block to the limiting position; and a compression spring that makes the counting gear approach the end wall of the shell along its own axial direction.

[0007] In some embodiments, a first assembly column protruding outward is provided on the end wall of the shell, the gear bracket is sleeved on the first assembly column, and the axis of the first assembly column is the first axis; a second assembly column parallel to the first assembly column is provided on the gear bracket, the counting gear is sleeved on the second assembly column, and the axis of the second assembly column is the second axis.

[0008] In some embodiments, the gear bracket is provided with a counting gear moving guide portion protruding from the surface of the gear bracket, and the counting gear moving guide portion includes a first guide section and a second guide section, the axial height of the first guide section increases from front to back, and the axial height of the second guide section decreases from front to back; the inner side of the counting gear is provided with a supporting rib protruding in a direction parallel to the axis of the counting gear, the supporting rib is opposite to the gear bracket, and the end portion can contact the counting gear moving guide portion; when the counting gear rotates, the supporting rib moves along the first guide section and the second guide section in sequence, when the supporting rib moves along the first guide section, the counting gear moves axially outward, and when the supporting rib moves along the second guide section, the counting gear moves axially inward; when the separation block is located at the initial position, the limiting protrusion does not contact the counting gear, and when the separation block is located at the limiting position, the limiting protrusion extends behind the second guide section to block and limit the supporting rib, and the counting gear leaves the driving gear.

[0009] Furthermore, a third guide segment is provided between the first guide segment and the second guide segment, and the axial height of the third guide segment remains unchanged, and the axial height of the third guide segment is the same as the height of the axial highest point of the first guide segment and the second guide segment.

[0010] In some embodiments, the compression spring is disposed between the gear end cover and the counting gear.

[0011] Furthermore, the counting gear movement guide portion is arranged on the periphery of the second assembly column.

[0012] Furthermore, the projection of the counting gear moving guide portion on the surface of the gear bracket is arc-shaped.

[0013] It can be known from the above technical scheme that the counting gear assembly of the present invention sets the counting gear on a rotatable gear bracket, and the gear bracket drives the counting gear to move between the meshing position and the separation position. When in the meshing position, the counting gear rotates with the driving gear to realize the detection of the processing box falling into the machine for installation. In the separation position, the counting gear does not rotate with the driving gear and is limited by the separation block. After the recognition of the preset value of the life of the processing box is completed once, the limiting slider drives the separation block to automatically return to the initial position, and the counting gear automatically returns to the meshing position with the rotation of the gear bracket. After installation, it can be recognized by the detection mechanism of the image forming device again, and the preset value of the life can be reset, and then the remaining developer in the processing box can be continued to be used, or the processing box can be reused after the developer is refilled. The processing box of the present invention does not need to manually operate the reset of the counting gear. It can be automatically reset by removing the processing box and then putting it in again. It is simple and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a schematic diagram of the structure of a processing box according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the process box after the gear end cover is removed according to an embodiment of the present invention;

[0017] Figure 3 It is a schematic structural diagram of another angle of the process box after the gear end cover is removed according to the embodiment of the present invention;

[0018] Figure 4 It is a schematic diagram of the exploded structure of the processing box counting gear assembly according to an embodiment of the present invention;

[0019] Figure 5 A schematic diagram of the structure of a process box according to an embodiment of the present invention with the gear end cover, the counting gear and the first elastic member removed;

[0020] Figure 6 for Figure 5 A partial enlarged schematic diagram of part A;

[0021] Figure 7 This is a schematic diagram of the structure of a gear bracket according to an embodiment of the present invention;

[0022] Figure 8 This is a schematic diagram of the structure of a counting gear according to an embodiment of the present invention;

[0023] Fig. 9 This is a structural schematic diagram of a separation block according to an embodiment of the present invention;

[0024] Fig.10 This is a schematic diagram of the structure of the inner side of the end cover of an embodiment of the present invention;

[0025] Fig.11 is a schematic diagram of a separation rib located closest to the shell end wall;

[0026] Fig.12 is a schematic diagram of a separation rib located farthest from the end wall of the shell;

[0027] Fig.13 It is a schematic diagram of the state of the counting gear assembly before the processing box falls into the machine;

[0028] Fig.14 It is a schematic diagram of the state of the counting gear assembly when the printer top cover is closed after the process cartridge falls into the machine;

[0029] Fig.15 It is a schematic diagram of the state where the counting gear moves outward along the axial direction;

[0030] Fig.16 This is a schematic diagram of the state when the counting gear and the driving gear are separated.

[0031] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings. When describing the embodiments of the present invention in detail, for the convenience of explanation, the drawings representing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. It should be noted that the drawings are simplified in form and use non-precise proportions, which are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention. At the same time, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "positive", "negative", "bottom", "upper", "lower", "front", "back", "left", "right", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two elements, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Reference Figures 1 to 6The processing box of this embodiment includes a shell 1, a gear end cover 2 and a counting gear assembly. The shell 1 has a powder bin for containing developer, and a stirring frame (not shown) that can rotate around its own axis is arranged in the powder bin. A gear end cover 2 is arranged on the outer side of one end of the shell 1, and the counting gear assembly is arranged between the gear end cover 2 and the end wall of the shell 1, and is covered by the gear end cover 2. In addition to the counting gear, other gears are arranged on the end wall of the shell 1, such as a stirring frame gear, an intermediate transmission gear, etc. These gears are meshed with each other to drive the corresponding rotating parts to rotate. For the sake of convenience, the gear that directly meshes with the counting gear and drives the counting gear to rotate is defined as a driving gear. The driving gear can be a stirring frame gear or other transmission gears. The driving gear of this embodiment is a stirring frame gear 11, and the stirring frame gear 11 is arranged at the end of the stirring frame.

[0035] The counting gear assembly of this embodiment includes: a counting gear 3, a gear bracket 4, a limiting slider 5, a slider reset spring 6, a separation shift block 7, a shift block reset spring 8, a bracket reset spring 9 and a compression spring 10.

[0036] The counting gear 3 of this embodiment is a full-tooth gear, that is, the circumferential outer edge of the counting gear 3 is evenly distributed with meshing teeth connected end to end. The counting gear 3 is arranged on the end wall of the housing 1 through the gear bracket 4. In this embodiment, a first assembly column 1a protruding outward along the axial direction parallel to the stirring frame (the axial direction of the counting gear) is arranged on the end wall of the housing 1, and the gear bracket 4 is sleeved on the first assembly column 1a and can rotate around the axis (first axis) of the first assembly column 1a. When the gear bracket 4 rotates, the counting gear 3 arranged on the gear bracket 4 moves with the gear bracket 4. When the gear bracket 4 rotates around the first axis, it can drive the counting gear 3 to move to the meshing position or to the separation position. The meshing position is a position where the counting gear 3 and the driving gear (the stirring frame gear 11 in this embodiment) are meshed and rotate synchronously with the driving gear, and the separation position is a position where the counting gear 3 and the driving gear are separated and do not rotate with the driving gear.

[0037] A bracket reset spring 9 is provided between the gear bracket 4 and the end wall of the housing 1. The bracket reset spring 9 is used to provide a force for the gear bracket 4 to move from the separation position to the meshing position, so that the gear bracket 4 swings from the separation position back to the meshing position around the first axis. The bracket reset spring 9 of this embodiment adopts a torsion spring, and other forms of elastic elements can also be used in other embodiments, as long as it can provide a reset force for the gear bracket 4.

[0038] like Figure 7 As shown, a second assembly column 4a is provided on the gear bracket 4, and the second assembly column 4a is parallel to the first assembly column 1a. The counting gear 3 is sleeved on the second assembly column 4a and can rotate around the axis (second axis) of the second assembly column 4a.

[0039] The detection and identification of the counting gear in this embodiment adopts the method that the counting gear cooperates with the detection mechanism on the image forming device during the process of the counting gear moving along its own axial direction. When the counting gear moves axially outward, it can cooperate with the detection mechanism to realize the identification of the counting gear. Specifically, the method of realizing the axial movement of the counting gear in this embodiment is that a counting gear moving guide part is set on the gear bracket 4, and the counting gear moving guide part protrudes from the surface of the gear bracket 4. Its projection on the surface of the gear bracket 4 can be an arc or a circle. The projection of the counting gear moving guide part on the surface of the gear bracket 4 in this embodiment is an arc. The counting gear moving guide part is arranged on the periphery of the second assembly column 4a. The counting gear moving guide part at least includes a first guide section 4b and a second guide section 4c, and the first guide section 4b is located before the second guide section 4c. The axial height of the first guide section 4b (the distance between the end face of the guide section on the axial direction of the counting gear and the surface of the gear bracket) increases from front to back, forming an increasingly higher guiding inclined surface. The axial height of the second guide section 4c decreases from front to back, forming an increasingly lower guiding inclined surface. The height of the axial highest point of the first guide section 4b is the same as the height of the axial highest point of the second guide section 4c. In this embodiment, the first guide segment 4b and the second guide segment 4c are connected by the third guide segment 4d, and the axial height of the third guide segment 4d remains unchanged. The axial height of the third guide segment 4d is the same as the height of the axial highest point of the first guide segment 4b and the second guide segment 4c.

[0040] A compression spring 10 ( Fig. 9 ), the function of the compression spring 10 is to press the counting gear 3 against the gear bracket 4. Figure 8 As shown, a support rib 3a protruding in a direction parallel to the axis of the counting gear is provided on the inner side of the counting gear 3 (the side of the counting gear opposite to the gear bracket 4). When the counting gear 3 is mounted on the gear bracket 4, the support rib 3a is opposite to the gear bracket 4, and the end is in contact with the moving guide portion of the counting gear. When the counting gear 3 rotates, it moves along the first guide segment 4b, the third guide segment 4d and the second guide segment 4c in sequence. Since the first guide segment 4b and the second guide segment 4c have different heights, when the support rib 3a moves along the first guide segment 4b, the counting gear 3 will move further and further away from the gear bracket 4 ( Fig.12 ), that is, moving outward along the axial direction. When it moves to the position farthest from the gear bracket 4, the counting gear 3 can cooperate with the detection mechanism of the image forming device such as a printer to realize the identification of the counting gear, and then reset the preset life value of the image forming device. When the supporting rib 3a moves along the second guide section 4c, the counting gear 3 will get closer and closer to the gear bracket 4, that is, move inward along the axial direction and return to the initial position ( Fig.11 ).

[0041] The limit slider 5 is movably disposed on the end wall of the housing 1. When the limit slider 5 moves upward, its top is exposed outside the gear end cover 2, so that the top of the limit slider 5 can contact the top cover of the image forming device. When the top cover is closed, the top cover can press the limit slider 5 downward. A slider return spring 6 is disposed between the limit slider 5 and the end wall of the housing 1. The slider return spring 6 is used to provide a force for the limit slider 5 to return upward. The limit slider 5 of this embodiment is T-shaped.

[0042] The separation block 7 is rotatably arranged on the limit slider 5. When the limit slider 5 moves up and down, it drives the separation block 7 to move up and down together. The separation block 7 can swing between the initial position and the limit position. When it is in the limit position, the separation block 7 can move the counting gear 3 (gear bracket 4) to be separated from the driving gear 11. A block reset spring 8 is arranged between the separation block 7 and the limit slider 5, and the block reset spring 8 is used to provide a force for the separation block 7 to return to the limit position.

[0043] like Fig.12 As shown, the separation block 7 has a limiting convex portion 7a. When the limiting slider 5 moves downward, the separation block 7 also moves downward, and the limiting convex portion 7a can extend to behind the second guide section 4c of the gear bracket. If the counting gear 3 does not start to rotate, the supporting rib 3a of the counting gear 3 is located behind the second guide section 4c. At this time, the limiting convex portion 7a of the separation block 7 moving downward will be blocked by the supporting rib 3a, and the separation block 7 overcomes the force of the block reset spring 8 and rotates to a certain position. After the counting gear 3 starts to rotate, the supporting rib 3a moves further and further away from the second guide section 4c, and the limiting protrusion 7a is no longer blocked by the supporting rib 3a. Under the action of the shift block reset spring 8, it rotates to the limiting position. At this time, after the limiting protrusion 7a extends to the second guide section 4c, the supporting rib 3a that has rotated back can be limited, so that the supporting rib 3a (counting gear 3) cannot continue to rotate, and under the blocking action of the limiting protrusion 7a, the gear bracket 4 swings to the separation position, and the counting gear 3 is separated from the driving gear, so that the counting gear and the driving gear cannot rotate with the driving gear.

[0044] The following describes the use of the processing box installation machine and the reset process of the counting gear in this embodiment in conjunction with the accompanying drawings. In the following description, the image forming device is described as a printer. Figures 13 to 16 This is a schematic diagram of the process from the counting gear starting to rotate to the counting completion and separation and stopping of rotation.

[0045] like Fig.13As shown, when the processing box is loaded into the printer without closing the cover, the limit slider 5 moves upward under the action of the slider return spring 6, and the top of the limit slider 5 protrudes outside the gear end cover (not shown). At this time, the separation block 7 also moves upward with the limit slider 5, and the limit convex part 7a does not contact the counting gear 3; the gear bracket 4 swings to the meshing position under the action of the bracket return spring 9, and the counting gear 3 and the stirring frame gear 11 (driving gear) are meshed. Before the counting gear 3 rotates, the supporting rib 3a is located at the initial position, that is, behind the second guide section 4c, and the counting gear 3 is also at the lowest point in the axial direction, that is, the position closest to the end wall of the housing 1, and also the position closest to the gear bracket 4.

[0046] like Fig.14 As shown, when the printer cover 100 is closed, the printer cover 100 presses down the limit slider 5, and the limit slider 5 moves downward under the action of the slider return spring 6, and the separation block 7 also moves downward together. When the separation block 7 moves downward, it is blocked by the counting gear 3 (support rib 3a) that has not started to rotate. The separation block 7 overcomes the action of the block return spring 8 and deflects upward by a certain angle, so as not to interfere with the rotation of the counting gear 3. At this time, the gear bracket 4 is still in the meshing position under the action of the bracket return spring 9, and the counting gear 3 and the stirring frame gear 11 remain meshed. When the printer starts working, the stirring frame gear 11 receives the rotational driving force from the printer and rotates, driving the counting gear 3 to rotate together.

[0047] like Fig.15 As shown, when the counting gear 3 starts to rotate, the supporting rib 3a gradually moves away from the second guide section 4c as the counting gear 3 rotates, and moves toward the first guide section 4b, and then moves along the first guide section 4b. In the process of moving along the first guide section 4b, the counting gear 3 moves farther and farther away from the end wall of the housing 1 along its own axial direction. When it moves to the highest point of the first guide section 4b and continues to move along the third guide section 4d, the counting gear 3 can cooperate with the detection mechanism on the printer to realize the identification of the counting gear. In this process, the printer top cover 100 is always pressed on the limit slider 5, and the limit slider 5 and the separation block 7 arranged thereon remain in a downward state. After the counting gear 3 rotates, the supporting rib 3a leaves the second guide section 4c, and the separation block 7 is not blocked by the supporting rib 3a. It rotates downward under the action of the block reset spring 8, and the limiting protrusion 7a extends to the limiting position, that is, extends to the back of the second guide section 4c.

[0048] like Fig.16As shown, after the processing box is installed and put into use, the printer top cover 100 is always pressed on the limit slider 5, the limit slider 5 and the separation block 7 arranged thereon remain in a downward state, and the limit convex portion 7a extends to the back of the second guide section 4c. After the counting gear 3 is detected by the printer detection mechanism, it continues to rotate with the driving gear 11, and the supporting rib 3a moves to the second guide section 4c and moves along the second guide section 4c. In the process of moving along the second guide section 4c, the counting gear 3 itself axially approaches the end wall of the housing more and more. When it moves to the end of the second guide section 4c and leaves the second guide section 4c, the supporting rib 3a is blocked by the limit convex portion 7a, and under the blocking force of the limit convex portion 7a, the counting gear 3 (gear bracket 4) is pushed backward by the limit convex portion 7a for a certain distance, so that the counting gear 3 and the stirring frame gear 11 are separated, so that the counting gear 3 cannot continue to rotate with the stirring frame gear 11.

[0049] When the number of pages printed by the printer reaches the preset life value, indicating that the developer in the processing box has been consumed, the printer top cover 100 is opened, and the printer top cover 100 no longer presses the limit slider 5. The limit bracket 5 drives the separation block 7 to reset upward under the action of the slider reset spring 6. After the separation block 7 moves upward, the limit convex part 7a no longer limits the counting gear 3. The gear bracket 4 returns to the meshing position under the action of the bracket reset spring 9. The counting gear 3 moves with the gear bracket 4 to complete the reset of the counting gear 3. Take out the processing box and reinstall it, and return to Fig.13 In the state shown, you can continue to use the developer in the powder bin without being restricted by the standard capacity.

[0050] If the number of pages printed by the printer reaches the preset life value again, indicating that the developer in the processing box has been consumed, the above process can be repeated until the developer in the processing box is completely consumed.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A processing box with a counting gear, comprising a housing, a gear end cover arranged on the outer side of one end of the housing, a counting gear assembly covered by the gear end cover, and a driving gear; It is characterized in that The counting gear assembly comprises: A gear support rotatably disposed on the end wall of the housing about a first axis; A counting gear with a full-tooth structure rotatably arranged on the gear bracket around a second axis, the counting gear being movable outward or inward along its own axis; when the gear bracket rotates, the counting gear is driven to move between a meshing position and a disengagement position, in which the counting gear is meshed with the driving gear at the meshing position, and the counting gear is disengaged from the driving gear at the disengagement position; A limit slider is movably arranged on the end wall of the housing, and the top of the limit slider can be exposed from the gear end cover when the limit slider moves upward; A separation block rotatably disposed on the limit slider, the separation block having a limit convex portion, the separation block being rotatable between an initial position and a limit position, and in the limit position, the limit convex portion limits the rotation of the counting gear and separates the counting gear from the driving gear; a bracket return spring for moving the gear bracket from the disengaged position to the engaged position; A slider return spring that enables the limit slider to move upward; A shift block return spring for moving the separation shift block toward the limit position; A compression spring is provided for making the counting gear approach the end wall of the housing along its axial direction.

2. The process cartridge according to claim 1, wherein: The end wall of the housing is provided with a first assembly column protruding outward, the gear bracket is sleeved on the first assembly column, and the axis of the first assembly column is the first axis; The gear bracket is provided with a second assembly column parallel to the first assembly column, the counting gear is sleeved on the second assembly column, and the axis of the second assembly column is the second axis.

3. The process cartridge according to claim 1 or 2, wherein: The gear bracket is provided with a counting gear moving guide protruding from the surface of the gear bracket, and the counting gear moving guide includes a first guide section and a second guide section, the axial height of the first guide section increases from front to back, and the axial height of the second guide section decreases from front to back; The inner side of the counting gear is provided with a supporting rib protruding in a direction parallel to the axis of the counting gear, the supporting rib is opposite to the gear bracket, and the end of the supporting rib can contact the moving guide part of the counting gear; When the counting gear rotates, the supporting rib moves along the first guide section and the second guide section in sequence, and when the supporting rib moves along the first guide section, the counting gear moves axially outward, and when the supporting rib moves along the second guide section, the counting gear moves axially inward; When the separation block is located at the initial position, the limiting protrusion does not contact the counting gear. When the separation block is located at the limiting position, the limiting protrusion extends behind the second guide section to block and limit the supporting ribs and make the counting gear leave the driving gear.

4. The process cartridge according to claim 3, wherein: A third guide segment is provided between the first guide segment and the second guide segment. The axial height of the third guide segment remains unchanged and is the same as the height of the axial highest point of the first guide segment and the second guide segment.

5. The process cartridge according to claim 3, wherein: The counting gear moving guide portion is arranged on the periphery of the second assembly column.

6. The process cartridge according to claim 3, wherein: The projection of the counting gear moving guide portion on the surface of the gear bracket is an arc.

7. The process cartridge according to claim 1, wherein: The compression spring is arranged between the gear end cover and the counting gear.

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