Integrated processing box

Abstract

The present invention relates to an integrated processing cartridge, which can be detachably installed in a laser printer pre-equipped with counted parts, and includes a developing unit and a drum unit that are combined with each other. The developing unit includes a developing shell having a toner accommodating chamber, an end cover located at a longitudinal end of the developing shell, and a counting assembly, wherein the counting assembly is used to interact with the counted parts. The drum unit includes a drum shell and a combining plate located at one longitudinal end of the drum shell, wherein the combining plate extends from the drum shell in a front-to-back direction and has an overhanging portion that exceeds the drum shell; along the left-right direction of the processing cartridge, the overhanging portion is not opposite to other parts of the drum shell. In a processing cartridge with this structure, the drum unit no longer needs to be provided with an accommodating space surrounded by the outer shell, which can not only fully utilize the available space of the processing cartridge to increase the toner capacity of the developing unit, but also ensure good fit between the developing unit and the drum unit.

Description

Technical Field

[0001] The present invention relates to the field of laser printing. Background Art

[0002] Process cartridges are common consumables in laser printers. One type of process cartridge currently consists of a developer unit that holds toner and a drum unit that holds waste toner. The developer unit and drum unit are detachable, and the drum unit is designed to have a significantly longer service life than the developer unit. Before use, the developer unit must first be installed into the housing enclosed by the drum unit. The drum unit, with the developer unit installed, is then installed into the laser printer.

[0003] When the toner in the developing unit is consumed, the user only needs to replace a new developing unit to continue using it, and the drum unit is retained. Therefore, the overall use cost of the processing cartridge is reduced; however, for users who are not familiar with this type of processing cartridge, when replacing the developing unit, they may also replace the drum unit together, resulting in waste of the drum unit.

[0004] To this end, there has been a method of increasing the toner capacity of the developing unit to reduce the frequency of user replacement. However, when the toner capacity of the developing unit is increased, its volume will also increase accordingly, and the existing drum unit cannot accommodate the developer unit with an increased volume. As a result, the toner capacity of the developing unit will be reduced, or in other words, the toner capacity of the developing unit will not be increased much. At this time, the usable space in the processing box is wasted. Summary of the Invention

[0005] The present invention provides an integrated process cartridge that not only fully utilizes the available space in the process cartridge to increase the toner capacity of the developing unit, but also ensures good coordination between the developing unit and the drum unit after the toner capacity is increased. The specific solution is as follows:

[0006] An integrated processing cartridge is detachably mounted in a laser printer pre-equipped with counted parts, comprising a developing unit and a drum unit coupled to each other, wherein the developing unit comprises a developing housing having a toner accommodating chamber and a counting assembly located at a longitudinal end of the developing housing, the counting assembly being used to interact with the counted parts; the drum unit comprises a drum casing and a coupling plate located at one longitudinal end of the drum casing, the coupling plate extending from the drum casing in a front-to-rear direction and having a protruding portion extending beyond the drum casing; along the left-right direction of the processing cartridge, the protruding portion is not opposite to other parts of the drum casing.

[0007] The developing unit and the drum unit are connected to each other through end covers and a connecting plate, which are respectively located at the left and right ends of the process box, wherein the connecting plate is formed integrally with or separately from the drum shell.

[0008] The process cartridge further includes connecting members respectively located at two longitudinal ends, one end of the connecting member is connected to the developing unit, and the other end of the connecting member is connected to the drum unit.

[0009] The developing unit includes an expansion portion extending from the developing housing in the vertical direction and a handle formed on the developing housing. The expansion portion is communicated with the toner accommodating chamber and extends beyond the handle in the vertical direction.

[0010] Preferably, two expansion portions are provided, and the two expansion portions are respectively located at two longitudinal ends of the developing housing.

[0011] The counting assembly includes a toggle gear and a toggle member, the toggle gear is used to receive driving force and toggle the toggle member, and the toggle member is used to interact with the counted member; during the counting process of the counting assembly, as the toggle gear rotates, the toggle member moves from an initial position in contact with the counted member to an intermediate position out of contact with the counted member, and then moves in the opposite direction until it reaches a terminal position in contact with the counted member again.

[0012] The toggle gear includes a tooth portion, a toothless portion arranged along its circumferential direction, and a toggle protrusion extending along its rotation axis. During the counting process, the tooth portion is used to receive driving force from an external power source, and the toggle protrusion toggle the toggle member to move. When the counting is completed, the toothless portion is opposite to the power source, so that the toggle gear cannot receive the driving force.

[0013] The toggle member at least includes a base portion and an action portion coupled to each other, and the action portion is deformable.

[0014] The toggle member further comprises a biasing portion connected to the base and a flexible sheet connected to the action portion. The toggle member as a whole can rotate around the base, and the biasing portion can undergo elastic deformation.

[0015] The toggle gear also includes a limiting protrusion arranged therein, and a limiting block for combining with the limiting protrusion is also arranged on the developing shell. When the counting component completes counting, the limiting protrusion abuts against the upstream side of the limiting block along the rotation direction of the toggle gear. When the toggle gear continues to be rotated, the limiting protrusion passes over the limiting block and abuts against the downstream side of the limiting block, and the counting component is reset.

[0016] As described above, in the processing box involved in the present invention, the developing unit and the drum unit are connected to each other through the end cover and the joint located at the longitudinal end, and the drum unit no longer needs to be provided with a accommodating space surrounded by the outer shell. This structure can make full use of the available space of the processing box to increase the toner capacity of the developing unit, and at the same time ensure good coordination between the developing unit and the drum unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional view of the process box according to the present invention when viewed from its driving end.

[0018] Figure 2 It is a three-dimensional view of the processing box involved in the present invention when viewed from its conductive end.

[0019] Figure 3 It is a schematic diagram of a state in which the developing unit and the drum unit in the processing box involved in the present invention are separated.

[0020] Figure 4 The present invention is a schematic diagram of a state in which a driving end cover of a developing unit in a processing box is separated from a developing housing.

[0021] Figure 5 This is a three-dimensional view of the processing box involved in the present invention with the driving end of the processing box hidden behind the end cover.

[0022] Figures 6A-6D It is a schematic diagram of the working process of the counting component 17 in the processing box involved in the present invention.

[0023] Figure 7 This is a schematic diagram of the state of the counting component in the processing box involved in the present invention after being reset. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] Figure 1 is a perspective view of the process cartridge according to the present invention when viewed from its driving end; Figure 2 It is a three-dimensional view of the processing box involved in the present invention when viewed from its conductive end.

[0026] The processing box 1 involved in the present invention has the following orientations: a first direction (lateral direction / front-back direction) A1A2 that is the same as its installation direction, a second direction (longitudinal direction / left-right direction) B1B2 that is the same as its length direction, and a third direction (vertical direction / up-down direction) C1C2 that is the same as its height direction.

[0027] As shown in the figure, the process cartridge 1 can be installed in the laser printer along the direction A1 and can be removed from the laser printer along the direction A2 opposite to the direction A1. The process cartridge 1 includes a developing unit 100 and a drum unit 200 that are combined with each other. The developing unit 100 stores toner required for development and a developing member 16 (such as a drum unit 200) for conveying toner to the outside. Figure 3 As shown), the drum unit 200 is equipped with a photosensitive member 22 for forming an electrostatic latent image, and the developing member 16 transports toner to the photosensitive member 22 to develop the electrostatic latent image.

[0028] Figure 3 It is a schematic diagram of a state in which a developing unit and a drum unit in a process cartridge according to the present invention are separated; Figure 4The present invention is a schematic diagram of a state in which a driving end cover of a developing unit in a processing box is separated from a developing housing.

[0029] The developing unit 100 includes a developing housing 11 having a toner accommodating chamber, an end cover 12, a driving assembly 13 and a counting assembly 17. The end cover 12, the driving assembly 13 and the counting assembly 17 are all located at one longitudinal end of the developing housing 11. The positional relationship between the three is not limited. For example, the end cover 12 and the driving assembly 13 may be arranged on the same side, and the counting assembly 17 may be arranged at the other longitudinal end opposite to the driving assembly 13; or, the end cover 12 may be arranged at one longitudinal end, and the driving assembly 13 and the counting assembly 17 may be arranged on the same side of the other longitudinal end; or, the end cover 12 and the counting assembly 17 may be arranged on the same side, and the drive assembly 13 may be arranged at the other opposite longitudinal end, etc.

[0030] Regardless of the layout of the end cap 12, drive assembly 13, and counter assembly 17, the end cap 12 is configured to be removably coupled to the developer housing 11. Generally, one longitudinal end of the process cartridge 1 receives driving force from the laser printer, and the other longitudinal end receives electrical power from the laser printer. Therefore, the longitudinal end receiving driving force can be referred to as the driving end, and the longitudinal end receiving electrical power can be referred to as the conductive end. In the present invention, the end cap 12, drive assembly 13, and counter assembly 17 are all located at the driving end of the developer unit 100.

[0031] The driving assembly 13 includes a power receiving member 131 for receiving driving force from the laser printer. When the processing cartridge is installed to the laser printer, the counting assembly 17 interacts with the counted member so that the laser printer completes the identification of the processing cartridge. The end cover 12 is provided with a first through hole 121, and the power receiving member 131 is exposed from the first through hole 121; at the same time, the developing unit 100 also includes a toner inlet member 15 arranged at the conductive end, and the user or operator can replenish fresh toner into the developing housing 11 through the toner inlet member 15. As shown in the figure, the toner inlet member 15 is a columnar body 151 protruding from the developing housing 11 in the second direction, and the columnar body 151 has an opening 152 connected to the toner accommodating chamber.

[0032] The drum unit 200 includes a drum casing 21, a photosensitive member 22 rotatably mounted in the drum casing 21, and a coupling plate 23 located at one longitudinal end of the drum casing 21. The coupling plate 23 is formed integrally with or separately from the drum casing 21. Preferably, the coupling plate 23 is located at the conductive end of the drum casing 21. Therefore, the developing unit 100 and the drum unit 200 are respectively coupled together at both longitudinal ends through the end cover 12 and the coupling plate 23. The specific coupling method is, for example, by providing a screw hole 122 on the end cover 12, coupling the developing unit 100 and the drum unit 200 by screwing, or coupling the two by a snap-fit method / axle pin method.

[0033] In the present invention, the coupling plate 23 extends from the drum casing 21 in the front-to-back direction. The portion 230 extending beyond the drum casing 21 also extends in the up-down direction and is arranged in a cantilevered manner. Along the left-right direction of the drum unit 200, the portion 230 does not oppose other parts of the drum casing 21. When the developing unit 100 and the drum unit 200 are coupled together, the interference with the developing unit 100 is reduced, and the two can be quickly coupled and positioned. At the same time, along the up-down direction, the drum unit 200 does not restrict the developing unit 100. Therefore, based on the space inside the laser printer, the volume of the developing cartridge 100 can be fully enlarged to ensure that more toner can be accommodated therein. Alternatively, the coupling plate 23 can extend from either longitudinal end of the drum casing 21 in the left-right direction, ultimately ensuring that the portion 230 of the coupling plate 23 does not oppose other parts of the drum casing 21 in the left-right direction.

[0034] like Figure 3 As shown, the coupling plate 23 is provided with a second through hole 231, and the toner inlet piece 15 passes through the second through hole 231, that is, at least a portion of the columnar body 151 passes through the second through hole 231, so that the opening and sealing operations of the opening 152 can be performed without separating the developing unit 100 and the drum unit 200, and the operation steps are simplified.

[0035] Furthermore, the developing unit 100 also includes an expansion portion 11a extending from the developing housing 11 in a third direction and a handle 11b formed on the developing housing 11, the expansion portion 11a is connected to the toner containing chamber, thereby increasing the toner capacity of the toner containing chamber; preferably, along the longitudinal direction, the developing unit 100 includes expansion portions 11a respectively located at the two longitudinal ends of the developing housing 11, and the handle 11b is located between the two expansion portions 11a, the expansion portion 11a extends in a direction away from the developing housing 11, and along the third direction, the expansion portion 11a extends beyond the handle 11b, so that while the toner capacity of the developing unit 11 is increased, after the processing box 1 is installed in the laser printer, the laser beam emitted from the laser printer to the photosensitive member 22 will not be blocked.

[0036] like Figure 2 and Figure 4As shown, the driving end and the conductive end of the process cartridge 1 are respectively equipped with a first connecting member 14a and a second connecting member 14b. During operation of the process cartridge 1, the first connecting member 14a and the second connecting member 14b are used to adjust the contact state between the developing unit 100 and the drum unit 200, ensuring good contact between the developing member 16 and the photosensitive member 22, and preventing the developing unit 100 and the drum unit 200 from separating from each other during the transmission of the driving force by the driving assembly 13. Preferably, the first connecting member 14a and the second connecting member 14b are both tension springs, one end of which is connected to the developing unit 100 and the other end is connected to the drum unit 200. Furthermore, a combination of an elongated hole / elliptical hole and a protrusion / pin can be provided in the developing unit 100 and the drum unit 200, and cooperate with the first tension spring 14a and the second tension spring 14b to better achieve the connection between the developing unit 100 and the drum unit 200.

[0037] Figure 5 This is a three-dimensional view of the drive end of the process cartridge involved in the present invention, with the end cover hidden. The counting assembly 17 includes a toggle gear 18 and a toggle member 19. The driving assembly 13 also includes a drive gear 132 that meshes with the toggle gear 18. When the power receiving member 131 receives driving force from the laser printer, the drive gear 132 is driven to rotate, and accordingly, the toggle gear 18 is also driven. During the rotation of the toggle gear 18, the toggle member 19 interacts with a toggle lever (the counted member) provided in the laser printer, thereby realizing the counting function of the counting assembly 17.

[0038] Figures 6A-6D It is a schematic diagram of the working process of the counting component 17 in the processing box involved in the present invention.

[0039] First combine Figure 5 and Figure 6AThe specific structure of each component in the counting assembly 17 and the structure of the toggle lever in the laser printer are described. As shown in the figure, the driving gear 132 is a full-tooth gear, and the toggle gear 18 is a non-full-tooth gear, including a tooth portion 181 arranged along its circumference, a toothless portion 182, and a toggle protrusion 183 extending along its rotation axis; the toggle member 19 can rotate around its rotation axis as a whole, including a rotating portion 191, and a biasing portion 192 and an action portion 193 located at both ends of the rotating portion 191. The biasing portion 192 is used to elastically deform when the toggle member 19 is toggled, and to provide the elastic force required for the toggle member 19 to reset when the toggle member 19 is not toggled. The action portion 193 is used to In order to interact with the lever in the laser printer when the toggle member 19 is toggled, preferably, the toggle member 19 also includes a flexible sheet 194 connected to the action portion 193, and the flexible sheet 194 is used to abut against the lever. It can be understood that the action portion 193 can also be directly set as a flexible sheet. In this case, there is no need to install a flexible sheet separately, but installing the flexible sheet 194 on the action portion 193 can reduce the material usage of the action portion 193, and the action portion 193, the rotating portion 191 and the biasing portion 192 can be formed as one piece. Therefore, the toggle member 19 involved below is installed with a flexible sheet 194.

[0040] There are two types of levers in existing laser printers, namely Figure 6A The first lever 400 shown by the dashed line and the second lever 400' shown by the solid line have the same general shape but slightly different sizes. Before the processing cartridge is installed in the laser printer, neither of the two levers contacts the detection member 300 in the laser printer. When the lever is subjected to an external force, the side of the lever closest to the detection member 300 contacts the detection member 300. When the external force is removed, the lever loses contact with the detection member 300. The laser printer confirms relevant information about the processing cartridge by sensing parameters such as the contact duration and number of contacts between the detection member 300 and the lever.

[0041] In practice, the laser printers having the first lever 400 and the second lever 400' are applicable to different process cartridges, but the two process cartridges only have slightly different structures of the counting components. The counting component 17 in the process cartridge of the present invention can be applied to both laser printers. The following description will take the first lever 400 as an example.

[0042] In order to make the working process of the counting component 17 more clearly described, Figures 6A-6D Only the driving gear 132, the counting assembly 17, and the lever and the detecting member 300 located in the laser printer are shown.

[0043] Figure 6AThe figure shows the status of the various components when the processing cartridge is installed in the laser printer but has not yet started working. During the process of installing the processing cartridge toward the laser printer, the flexible sheet 194 abuts against the first portion 401 of the lever 400, forcing the lever 400 to rotate in the direction indicated by r4, and the second portion 402 opposite to the first portion 401 abuts against the detection member 300. Before the processing cartridge starts working, the flexible sheet 194 remains in abutment with the first portion 401 of the lever, and the tooth portion 181 just begins to engage with the drive gear 132.

[0044] When the power receiving member 131 starts to rotate, the driving gear 132 rotates in the direction indicated by r1, and then the shifting gear 18 starts to rotate in the direction indicated by r2, and the shifting protrusion 183 gradually approaches the flexible sheet 194. Figure 6B As shown, the toggle protrusion 183 pushes the flexible sheet 194 and the action portion 193 together, so that the toggle member 19 rotates in the direction indicated by r3, and the biasing portion 192 is blocked by the blocking protrusion 11c provided on the shell 11 and elastically deforms. When the flexible sheet 194 is out of contact with the first part 401 of the toggle lever, since the second part 402 of the toggle lever is heavier than the first part 401, the toggle lever 400 rotates in the direction indicated by r5, and the second part 402 is out of contact with the detection member 300.

[0045] When the flexible sheet 194 and the action portion 193 reach the farthest distance from the center of the toggle gear 18, as the toggle gear 18 rotates, the flexible sheet 194 no longer moves away from the center of the toggle gear 18, and the biasing portion 192 no longer undergoes elastic deformation. Under the action of the accumulated elastic force, the toggle member 19 is forced to rotate in the opposite direction of r3, as shown in FIG. Figure 6C As shown, the flexible sheet 194 contacts the first portion 401 of the lever again until it reaches Figure 6D At the terminal position shown, at this time, the toothed portion 182 of the toggle gear 18 is opposite to the driving gear 132, so that the driving force of the driving gear 132 cannot be transmitted to the toggle gear 18, and the toggle gear 18 stops rotating. Under the action of the biasing portion 192, the flexible sheet 194 abuts against the first portion 401 of the toggle lever, and the toggle lever 400 rotates again in the direction shown by r4, and the second portion 402 of the toggle lever contacts the detection member 300 again and maintains contact, and the counting component 17 completes the counting.

[0046] As described above, during the counting process of the counting assembly 17, as the toggle gear 18 rotates, the toggle member 19 moves from the initial position in contact with the toggle rod 400 to the middle position in contact with the toggle rod 400, and then moves in the opposite direction until it reaches the terminal position in contact with the toggle rod 400 again. The force for the toggle member 19 to move in the opposite direction can be the biasing portion 192 as described in the present invention or an elastic member abutting against the toggle member 19. When the force for the toggle member 19 to move in the opposite direction comes from the elastic member, the biasing portion 192 may no longer be required. At this time, the toggle member 19 can be simplified to include a base 191 (rotating portion) and an action portion 193 that are combined with each other, and the action portion 193 is used to interact with the toggle rod 400.

[0047] In the present invention, the part where the toggle member 19 contacts the toggle lever 400 is the flexible sheet 194. Therefore, the length of the flexible sheet 194 can be appropriately extended to ensure that the flexible sheet 194 can contact toggle levers of different shapes, thereby ultimately achieving the purpose of the counting component 17 being applicable to a variety of laser printer models.

[0048] Figure 7 This is a schematic diagram of the state of the counting component in the processing box involved in the present invention after being reset.

[0049] When the processing cartridge is removed from the laser printer, the flexible sheet 194 no longer abuts the first portion 401 of the lever, and the toothed portion 182 of the shifting gear 18 remains relative to the driving gear 132. To ensure that the counting assembly 17 can operate normally when the processing cartridge is installed again, the counting assembly 17 needs to be reset. As shown in the figure, the shifting gear 18 also includes a limiting protrusion 184 disposed therein, and a limiting block 11e for combining with the limiting protrusion 184 is also provided on the developing housing 11.

[0050] When the counting assembly 17 completes counting, the limiting protrusion 184 abuts against the upstream side of the limiting block 11e. When the counting assembly 17 is reset, the toggle gear 18 is toggled to continue rotating in the direction indicated by r2 until the limiting protrusion 184 passes over the limiting block 11e and abuts against the downstream side of the limiting block 11e. At the same time, the tooth portion 181 of the toggle gear 18 also just meshes with the driving gear 132 (as shown in FIG. Figure 6A As shown), even if the toggle gear 18 is subjected to an external force and has a tendency to rotate in the opposite direction of r2, the toggle gear 18 will remain stationary under the combined action of the limiting protrusion 184 and the limiting block 11e.

[0051] The above describes the use of the counting mechanism 17 in the integrated processing box. It can be understood that when the developing unit 100 and the drum unit 200 are formed separately, the counting mechanism 17 can still be set in the developing unit 100, and the developing unit 100 can be used in multiple models.

[0052] As described above, the processing box 1 involved in the present invention includes a developing unit 100 and a drum unit 200 that are combined with each other. The two are combined with each other through the end cover 12 and the combining plate 23 located at the two longitudinal ends of the processing box. The drum unit 200 no longer needs to be provided with a accommodating space surrounded by the outer shell. At the same time, at least one of the two longitudinal ends of the developing shell 11 of the developing unit 100 is provided with an expansion portion 11a. This structure not only makes full use of the available space of the processing box and increases the toner capacity of the developing unit 100, but also enables the developing unit 100 with the increased capacity to form a good match with the drum unit 200.

Claims

1. An integrated process cartridge, removably mounted in a laser printer with a pre-set counted component, comprising a developer unit and a drum unit coupled to each other, the developer unit comprising a developer housing having a toner-receiving chamber and a counter assembly located at a longitudinal end of the developer housing, the counter assembly being configured to interact with the counted component; The drum unit includes a drum casing, and a coupling plate located at one longitudinal end of the drum casing, the coupling plate extending from the drum casing in the front-rear direction and having a protruding portion extending beyond the drum casing; It is characterized by: Along the left-right direction of the process cartridge, the protruding portion is not opposite to other parts of the drum housing; The counting assembly includes a toggle gear and a toggle member. The toggle gear is used to receive a driving force and toggle the toggle member. The toggle member can rotate around its rotation axis as a whole. It includes a rotating portion and an action portion located at one end of the rotating portion. The action portion is used to interact with the counted member when the toggle member is toggled. The action portion is configured as a flexible sheet or a flexible sheet is installed on the action portion. The flexible sheet is used to abut against the counted member. The toggle gear is a non-fully toothed gear, comprising a toothed portion and a toothless portion arranged along its circumference, and a toggle protrusion extending along the rotation axis of the toggle gear. During the counting process of the counting assembly, the toggle protrusion is used to toggle the toggle member to move. The toothed portion receives driving force from the power source, and the toggle gear is driven to rotate. The toggle member moves from an initial position in contact with the counted member to an intermediate position out of contact with the counted member, and then moves in the opposite direction until it reaches a terminal position in contact with the counted member again. When counting is completed, the toothless portion is opposite to the power source, so that the toggle gear receives no driving force. The force for the toggle member to move in the opposite direction is generated by a biasing portion arranged in the toggle member or an elastic member abutting against the toggle member. The biasing portion is used to elastically deform when the toggle member is toggled, and to provide the toggle member with the elastic force required for resetting when the toggle member is not toggled. The biasing portion is arranged at the other end of the rotating portion relative to the acting portion.

2. The integrated process cartridge according to claim 1, wherein: The developing unit and the drum unit are coupled to each other through end covers and coupling plates, which are respectively located at left and right ends of the process cartridge.

3. The integrated process cartridge according to claim 2, wherein: The combining plate is formed integrally with or separately from the drum shell.

4. The integrated process cartridge according to claim 1, wherein: The process cartridge further includes connecting members respectively located at two longitudinal ends, one end of the connecting member is connected to the developing unit, and the other end of the connecting member is connected to the drum unit.

5. The integrated process cartridge according to claim 1, wherein: The developing unit includes an expansion portion extending from a developing housing in an up-down direction and a handle formed on the developing housing, wherein the expansion portion is communicated with the toner accommodating chamber.

6. The integrated process cartridge according to claim 5, wherein: In the up-down direction, the expansion portion extends beyond the handle.

7. The integrated process cartridge according to claim 6, wherein: The number of the expansion parts is two, and the two expansion parts are respectively located at two longitudinal ends of the developing shell.

8. The integrated process cartridge according to claim 1, wherein: The toggle gear also includes a limiting protrusion arranged therein, and a limiting block for combining with the limiting protrusion is also arranged on the developing shell. When the counting component completes counting, the limiting protrusion abuts against the upstream side of the limiting block along the rotation direction of the toggle gear. When the toggle gear continues to be rotated, the limiting protrusion passes over the limiting block and abuts against the downstream side of the limiting block, and the counting component is reset.

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