Developing cartridge

Abstract

The application relates to a developing box detachably installed in a laser printer, comprising a shell, a developing roller, a driving device comprising a driving force input part and a developing roller gear, the driving force input part comprising a driving force receiving part for receiving a driving force from the laser printer and a second driving gear meshing with the developing roller gear, and a powder outlet knife comprising a knife holder and a knife blade combined with each other, the knife holder comprising a first part and a second part oppositely bent, a bending part being formed between the first part and the second part, and the knife blade being fixed on the second part and abutting against a surface of the developing roller for adjusting a carbon powder layer thickness of the surface of the developing roller, when observed along a longitudinal direction of the developing box, the driving force receiving part does not overlap the knife blade and the bending part, and the second driving gear overlaps the first part of the knife holder, and in the developing box with the structure, the influence of vibration generated when the driving force receiving part receives the driving force on the developing roller and the powder outlet knife can be reduced.

Description

[0001] This invention patent application is a divisional application of the Chinese invention patent application filed by the applicant with the Chinese Patent Office on April 9, 2021, entitled "Counting Device and Developing Box", with application number 202110381890.5. Technical Field

[0002] This invention relates to the field of electrophotographic imaging, and more particularly to a developing cartridge that can be detachably installed in an electrophotographic imaging device. Background Technology

[0003] Laser printers are commonly used electrophotographic imaging devices. The developing cartridge is a consumable that is detachably installed in the laser printer and contains toner. The developing cartridge includes a drive force input component for receiving driving force from the laser printer, a developing roller for conveying toner to the outside, and a toner dispensing blade for adjusting the thickness of the toner layer on the surface of the developing roller. The toner dispensing blade contacts the outer surface of the developing roller. Along the length direction of the developing cartridge, the drive force input component is located at one of its ends. The toner dispensing blade and the developing roller are arranged in the length direction. At the instant that the drive force input component receives driving force from the laser printer, the driving force causes the drive force input component to vibrate. When the vibration is transmitted to the developing roller and the toner dispensing blade, it may cause a change in the contact state between the developing roller and the toner dispensing blade, thereby affecting the imaging quality of the developing cartridge. Summary of the Invention

[0004] This invention provides a developing cartridge to solve the above-mentioned technical problems, and the specific solution is as follows:

[0005] A developing cartridge, detachably mounted in a laser printer, includes: a housing for holding toner; a developing roller rotatably mounted in the housing; a toner delivery roller rotatably mounted in the housing for delivering toner to the developing roller; and a drive mechanism including a drive force input component, a toner delivery roller gear, and a developing roller gear, wherein the toner delivery roller gear is located at the end of the toner delivery roller, and the developing roller gear is located at the end of the developing roller. The drive force input component includes a drive force receiving portion and a first drive gear and a second drive gear coupled to the drive force receiving portion. The diameters of the drive force receiving portion, the first drive gear, and the second drive gear increase sequentially. The drive force receiving portion is used to receive drive force from the laser printer. The first drive gear meshes with the powder feeding roller gear, and the second drive gear meshes with the developing roller gear; the powder discharge blade includes a blade holder and a blade that are coupled together. The blade holder is fixedly mounted on the housing. The blade holder includes a first part and a second part that are bent relative to each other, forming a bend between the first part and the second part. The blade is fixed on the second part and abuts against the surface of the developing roller for adjusting the thickness of the toner layer on the surface of the developing roller; when viewed along the longitudinal direction of the developing cartridge, the driving force receiving part does not overlap with at least one of the blade and the bend, the first drive gear does not overlap with at least one of the bend, the second part of the blade holder, and the blade, and the second drive gear overlaps with the first part of the blade holder.

[0006] In some implementations, the outer diameter of the developing roller ranges from 12 mm to 19 mm.

[0007] In some implementations, the outer diameter of the developing roller is 16 mm.

[0008] In some embodiments, when viewed along the rotation axis of the driving force receiving unit, the distance between the center point of the developing roller and the center point of the driving force receiving unit is 17mm-19mm.

[0009] In some embodiments, along the installation direction of the developing cartridge, the part where the powder discharge blade contacts the developing roller and the developing roller are both located in front of the driving force receiving part.

[0010] In some embodiments, both the developing roller and the blade are located outside the circumference of the drive force receiving section.

[0011] In some embodiments, the first portion is located above the driving force receiving portion along the vertical direction of the developing cartridge. Attached Figure Description

[0012] Figure 1 and Figure 2 This is a perspective view of the developing cartridge involved in this invention.

[0013] Figure 3 This is an exploded view of some components of the developing cartridge involved in this invention.

[0014] Figure 4 This is a perspective view of the counting gear in the developing cartridge that relates to the present invention.

[0015] Figure 5A and Figure 5B This is a perspective view of the actuating element of the counting device in the developing cartridge according to the present invention.

[0016] Figure 6 This is a perspective view of the moving part of the counting device in the developing cartridge according to the present invention.

[0017] Figure 7A This is a perspective view of the end cap of the developing cartridge involved in this invention, viewed from the outside.

[0018] Figure 7B This is a perspective view of the end cap of the developing cartridge involved in this invention, viewed from the inside.

[0019] Figure 8 This is a schematic diagram showing the relative positions of the developing roller, the powder discharge blade, and the driving force receiving gear when the developing cartridge of the present invention is viewed in a direction parallel to its longitudinal direction.

[0020] Figure 9A This is a side view of the counting device in the developing cartridge of the present invention, taken from the side of the developing cartridge when counting begins.

[0021] Figure 9B This is a schematic diagram showing the relative position of the counting gear and the end cap of the counting device in the developing cartridge of the present invention when counting begins.

[0022] Figure 9C This is a side view of the counting device in the developing cartridge of the present invention when the counting begins, viewed along the vertical direction of the developing cartridge.

[0023] Figure 10A This is a schematic diagram showing the relative positions of the counting gear, drive component, and moving component of the counting device in the developing cartridge of the present invention when counting is completed.

[0024] Figure 10B This is a schematic diagram showing the relative positions of the counting gear, drive component, and moving component when viewed vertically along the developing cartridge after the counting device in the developing cartridge of the present invention has completed counting. Detailed Implementation

[0025] The embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that any modifications made by those skilled in the art to the embodiments of the present invention based on the following description should be considered to be within the scope of protection of the present invention.

[0026] Figure 1 and Figure 2 This is a perspective view of the developing cartridge involved in this invention; Figure 3This is an exploded view of some components of the developing cartridge involved in this invention.

[0027] The developing cartridge 100 can be combined with a drum unit (not shown) to form a processing cartridge. Both the developing cartridge 100 and the processing cartridge are detachably installed in a laser printer equipped with a counting section. The developing cartridge 100 is installed along the y-direction and has a length extending in the x-direction and a height extending in the z-direction. The z-direction is the direction from the bottom to the top of the developing cartridge 100 when it is normally positioned. Here, the direction parallel to the x-direction is defined as longitudinal, the direction parallel to the y-direction as transverse, and the direction parallel to the z-direction as vertical.

[0028] The developing cartridge 100 includes a housing 10 for containing toner, a developing roller 11 rotatably mounted in the housing 10, a toner dispensing blade 14 and a toner feeding roller 15 in contact with the developing roller 11, a driving device 20 and a counting device 30 located at the longitudinal end of the housing, and an end cap 12 disposed on the same side as the counting device 30. The toner feeding roller 15 conveys toner to the developing roller 11, which then supplies it outward. The toner dispensing blade 14 abuts against the outer surface of the developing roller 11 to adjust the thickness of the toner layer on the outer surface of the developing roller 11. The counting device 30 can be disposed on the same side as the driving device 20, or they can be located at the two longitudinal ends of the housing 10 respectively. Regardless of their distribution, the driving force required for the counting device 30 to operate is supplied by the driving device 20. That is, after the driving device 20 receives driving force from external components such as a laser printer, the developing roller 11, the toner feeding roller 15, and the counting device 30 are all driven to operate.

[0029] like Figure 2 As shown, the drive force input 21 for receiving the drive force in the drive unit 20 is exposed from the end cover 12, and at least a portion of the counting device 30 is also exposed from the end cover 12. Specifically, along the y-direction, the component in the counting device 30 for receiving the reset force is exposed from the rear end of the end cover 12, which facilitates the operator to reset the counting device 30, or the component inside the drum unit or laser printer to force the counting device 30 to reset during the installation or removal of the developing cartridge 100.

[0030] like Figure 3As shown, the powder delivery blade 14 includes a blade holder 141 and a blade 142 that are coupled together. The blade holder 141 is fixedly mounted on the housing 10, and the blade abuts against the outer surface of the developing roller 11. The driving device 20 includes a driving force input component 21, a developing roller gear 22, a powder delivery roller gear 23, and at least one intermediate gear 24. The driving force input component 21 includes a driving force receiving part 211 and a first driving gear 212 and a second driving gear 213 coupled with the driving force receiving part 211. The diameters of the driving force receiving part 211, the first driving gear 212, and the second driving gear 213 increase sequentially. The driving force receiving part 211 receives driving force from the outside. The first driving gear 212 meshes with the powder delivery roller gear 23, and the second driving gear 213 meshes with the developing roller gear 22. When the driving force input component 21 receives driving force, the developing roller gear 22, the powder delivery roller gear 23, and at least one intermediate gear 24 are all driven, and thus, the developing roller 11 and the powder delivery roller 15 begin to rotate.

[0031] The counting device 30 includes a counting gear 31, a toggle member 32, a movable member 33, and a first reset member 34. The counting gear 31 meshes with the drive gear 24. When the drive gear 24 starts to rotate, the counting gear 31 is driven. The driving force of the counting gear 31 can also be generated by friction between the rubber layer on the outer surface of the drive gear 24 and the counting gear 31. Alternatively, both the drive gear 24 and the counting gear 31 can be replaced with rubber wheels. Therefore, the drive gear 24 can be considered as one of the driving members for driving the counting gear 31 to rotate, and the counting gear 31 can be considered as one of the driven members. The toggle member 32 is separately formed from the counting gear 31 and is eccentrically positioned. As the counting gear 31 rotates, the toggle member 32 is periodically actuated by the counting gear 31. When the toggle member 32 is actuated, it interacts with the laser beam. The counting units in the printer interact to complete the laser printer's identification of the developing cartridge 100. A portion of the movable part 33 is coaxially arranged with the counting gear 31. Under the pushing force of the first reset member 34, the movable part 33 tends to move away from the driving member 24, or in other words, the movable part 33 tends to disengage from the driving member 24. After counting is completed, the counting gear 31 disengages from the driving member 24 under the drive of the movable part 33. When the counting device 30 needs to be reset, by applying a force to the movable part 33 that overcomes the pushing force of the first reset member 34, the counting gear 31 returns to the position engaged with the driving member 24 under the drive of the movable part 33. In other words, the counting gear 31 in this invention can move between the position engaged with the driving member 24 and the position disengaged from the driving member 24 under the drive of the movable part 33.

[0032] The first reset member 34 can generate a pushing force by using an elastic element or a magnetic element, etc. Preferably, the first reset member 34 is a torsion spring, one end of which abuts against the housing 10 and the other end against the movable member 33; for example Figure 3As shown, to ensure that the actuating member 32 can stably receive the actuating force from the counting gear 31, the counting device 30 also includes a second reset member 35 connected to the actuating member 32. The second reset member 35 forces the actuating member 32 back to a position where it can receive the actuating force applied by the counting gear 31. Similarly, the second reset member 35 can also be an elastic member or a magnetic member, etc. Preferably, the second reset member 35 is a tension spring, one end of which is connected to the actuating member 32 and the other end is connected to the end cover 12.

[0033] Figure 4 This is a perspective view of the counting gear in the developing cartridge involved in the present invention; Figure 5A and Figure 5B This is a perspective view of the actuating element of the counting device in the developing cartridge according to the present invention; Figure 6 This is a perspective view of the moving parts of the counting device in the developing cartridge according to the present invention; Figure 7A This is a perspective view of the end cap of the developing cartridge involved in this invention, viewed from the outside. Figure 7B This is a perspective view of the end cap of the developing cartridge involved in this invention, viewed from the inside.

[0034] The counting gear 31 is rotatable about the rotation axis L1 and includes teeth 312 on its outer circumference, at least one actuating protrusion 313 on a surface 311, and an unlocking member 314 that rotates with the counting gear. The teeth 312 engage with the driving member 24 to receive driving force. The actuating protrusion 313 is arranged along the circumferential direction of the counting gear 31. The number and shape of the actuating protrusion 313 can be determined according to the amount of developing cartridge information that the laser printer needs to identify. For example, the laser printer can determine the lifespan information of the developing cartridge based on the number of actuating protrusions 313, or it can determine the model information of the developing cartridge based on the length of the actuating protrusion 313 in the circumferential direction of the counting gear 31. When there are multiple actuating protrusions 313, they are arranged at intervals. The unlocking member 314 is used to unlock the moving member 33, which will be described in detail below.

[0035] like Figure 4 As shown, the counting gear 31 also includes a coupling portion 315 disposed therein, which is used to engage with a part of the movable member 33, so that after the counting device 30 has completed counting, the counting gear 31 can move with the movement of the movable member 33. Specifically, the coupling portion 315 is a shaft hole coaxially arranged with the rotation axis L1 and protruding from the surface 311. Correspondingly, the movable member 33 is provided with a protrusion 332 that mates with the shaft hole (e.g., ...). Figure 6(as shown), or, the protrusion 332 is provided on the counting gear 31, and the shaft hole is provided on the movable part 33; deformably, the shaft hole or protrusion 332 may not be coaxial with the rotation axis L1, but may be parallel to or relatively inclined to the rotation axis L1 on the counting gear 31, as long as the counting gear 31 can move with the movement of the movable part 33.

[0036] The actuating element 32 and the counting gear 31 are eccentrically arranged. When the counting gear 31 rotates, the actuating protrusion 313 actuates the actuating element 32 to rotate, thereby causing the actuating element 32 to interact with the part being counted. Compared with the existing structure in which the actuating element 32 and the counting gear 31 are concentrically arranged, the actuating element 32 in this invention is not only separately arranged from the counting gear 31, but the two are also relatively eccentric. Therefore, the developing cartridge manufacturer can change the relative position of the actuating element 32 and the counting gear 31 according to the different positions of the part being counted in the laser printer, without having to redesign the counting gear 31, which helps to reduce the production cost of the developing cartridge manufacturer.

[0037] The actuating member 32 includes a base 321 rotatable about a rotation axis L2, a middle portion 322 protruding outward from the base 321, an actuating block 323 disposed on the middle portion 322, and a force receiving portion 324. The force receiving portion 324 abuts against the actuating protrusion 313 on the counting gear 31. When the counting gear 31 rotates, the actuating protrusion 313 pushes the force receiving portion 324, causing the actuating member 32 to rotate about the rotation axis L2. At the same time, the actuating block 323 interacts with the counted portion. Along the rotation axis L2, the actuating block 323 and the force receiving portion 324 are located on both sides of the middle portion 322. During the rotation of the actuating member 32, the interaction between the actuating block 323 and the counted portion and the interaction between the force receiving portion 324 and the actuating protrusion 313 can be unaffected, and the complexity of the developing cartridge can be reduced.

[0038] The movable component 33 includes a main body 331 and a rotating part 333 and a coupled part (protrusion) 332 disposed on the main body 331. Under the pushing action of the first reset component 34 or when overcoming the pushing force of the first reset component 34, the movable component 33 can rotate around the rotation axis L3 via the rotating part 333. As described above, preferably, the protrusion 332 is coaxially arranged with the counting gear 31, that is, the rotation axis L1 passes through the protrusion 332. At this time, the rotation axis L1 and the rotation axis L3 are parallel to each other, and the movable component 33 moves in a plane perpendicular to the rotation axis L1. Figure 6As shown, the movable part 33 also includes a positioning part 334, a locking part 336, and a forced pushing part 337 disposed on the main body 331. Preferably, the positioning part 334, the locking part 336, and the forced pushing part 337 are all integrally formed with the main body 331. One end of the first reset member 34 is received by the positioning part 334. The locking part 336 is used to engage with an external locking member to prevent the movable part 33 from rotating around the rotation axis L3 under the forced pushing of the first reset member 34, so that the engagement part 315 between the protrusion 332 and the counting gear 31 remains relatively stationary. At this time, the counting gear 31 is engaged with the driving member 24. When the counting device 30 needs to be reset, the forced pushing part 337 receives the force from the outside, overcomes the forced pushing force applied by the first reset member 34 to the movable part 33, so that the movable part 33 rotates around the rotation axis L3, and then drives the counting gear 31 back to the position engaged with the driving member 24 through the protrusion 332.

[0039] It is possible that the locked part 336 and the forced push part 337 are both formed separately from the main body 331. At this time, the locked part 336 and the main body 331 are connected by connecting members, and when the locked part 336 is locked by an external locking member, the main body 331 is also locked. When an external force is applied to the forced push part 337, the main body 331 can also rotate around the rotation axis L3.

[0040] The end cap 12 includes an end cap body 120, a first through hole 121, a second through hole 122, and a third through hole 125 disposed on the end cap body 120. The first through hole 121 is generally open along the y-direction and faces the rear end of the developing cartridge in the mounting direction. Its specific shape is not limited, that is, the first through hole 121 can be circular or polygonal, etc. The second through hole 122 and the third through hole 125 extend along the x-direction. The counting device 30 is exposed through the second through hole 122, and the driving force receiving part 211 is exposed through the third through hole 125. Figure 7A and Figure 7B As shown, the end cap 12 also includes a cover 123 disposed opposite to the second through hole 122 and a plurality of positioning posts 124 / 127 / 128 / 129 protruding from the cover 123 or the end cap body 120 toward the housing. The counting gear 31 is opposite to the positioning post 124, but the positioning part 127 does not restrict the movement of the counting gear 31. The movable part 33 is supported and positioned by the positioning post 127, the actuating part 32 is supported and positioned by the positioning post 129, and one end of the second reset part 35 is connected to the positioning post 128.

[0041] Furthermore, the end cap 12 also includes a locking member 126 disposed adjacent to the second through hole 122. That is, the locking member 126 in this invention is disposed on the end cap 12. Of course, the locking member 126 can also be disposed on the housing 10. The following description takes the locking member 126 disposed on the end cap 12 as an example.

[0042] Preferably, the locking member 126 is formed as part of the end cap body 120, and the locking member 126 is deformable relative to the end cap body 120, such as... Figure 7B As shown, the locking member 126 is provided with an unlocking protrusion 1261 and a limiting block 1262 on the side facing the housing 10. A locking part 1263 is formed between the locking protrusion 1261 and the limiting block 1262. The locking part 1263 is formed as a locking groove. When the locked part 336 enters the locking groove 1263, the movable member 33 is locked and cannot be forced to move by the first reset member 34.

[0043] Figure 8 This is a schematic diagram showing the relative positions of the developing roller, the powder discharge blade, and the driving force receiving gear when the developing cartridge of the present invention is viewed in a direction parallel to its longitudinal direction.

[0044] As described above, when the developing cartridge 100 is in operation, the driving force receiving unit 211 needs to receive driving force from the laser printer and drive the toner feeding roller gear 23 and the developing roller gear 22 to rotate through the first driving gear 212 and the second driving gear 213 respectively. The blade holder 141 of the toner dispensing blade includes a first part 141a and a second part 141b that are bent relative to each other. Preferably, a bent portion 141c with a 90° included angle is formed between the first part 141a and the second part 141b. The blade 142 is fixed on the second part 141b. When the toner dispensing blade 14 is fixed to the housing 10, the first part 141a and the second part 141b limit each other to ensure that the toner dispensing blade 14 is stably installed on the housing 10.

[0045] The driving force input component 21 is connected to the housing 10 via the bracket 13. During the process of the driving force receiving part 211 receiving driving force from the outside, during the process of the first driving gear 212 transmitting driving force between the powder feeding roller gear 23, and during the process of the second driving gear 213 transmitting driving force between the developing roller gear 22, vibration will occur between the two connected components. In particular, at the moment when the driving force receiving part 211 receives driving force, the entire driving force input component 21 will generate a large vibration. When this vibration is transmitted to the powder discharge blade 14 and the developing roller 11 through the housing 10, it may cause a change in the contact state between the powder discharge blade 14 and the developing roller 11.

[0046] To reduce the impact of vibration transmission on the relative position between the powder discharge blade 14 and the developing roller 11, such as... Figure 8As shown, when viewed along the x-direction of the developing cartridge, at least the driving force receiving part 211 does not overlap with the toner ejector blade 14. At the instant the driving force receiving part 211 receives the driving force, the vibration transmitted to the toner ejector blade 14 and the developing roller 11 can be reduced. Alternatively, at least the driving force receiving part 211 does not overlap with at least one of the bending part 141c and the blade 142. In this way, even if vibration is transmitted to the toner ejector blade 14, the vibration can only affect the first part 141a of the blade holder, and will not affect the second part 141b of the blade holder and the blade 142 mounted on the second part 141b of the blade holder.

[0047] like Figure 8 As shown, along the installation direction y of the developing cartridge, the developing roller 11 and the blade 142 are both located in front of the driving force receiving part 211, or in other words, the developing roller 11 and the blade 142 are both located outside the circumference of the driving force receiving part 211. Along the vertical direction z, the first part 141a of the blade holder is located above the driving force receiving part 211. While reducing the impact of vibration on the relative position between the powder discharge blade 14 and the developing roller 11, the outer diameter of the developing roller 11 can also be reduced when the size of the developing cartridge 100 along the installation direction is determined, thereby reducing the material cost of the developing roller 11. In this invention, the outer diameter d of the developing roller 11 can be selected in the range of 12mm-19mm, preferably 16mm. The distance between the center point A of the developing roller 11 and the center point B of the driving force receiving part 21 (driving force receiving part) is 17mm-19mm.

[0048] Furthermore, when viewed along the longitudinal direction of the developing cartridge 100, the first drive gear 212 does not overlap with at least one of the bending portion 141c, the second part of the blade holder 141b, and the blade 142. Therefore, the impact of the vibration generated when the first drive gear 212 transmits driving force to the powder feeding roller gear 23 on the blade 142 is reduced.

[0049] Figure 9A This is a side view of the counting device in the developing cartridge of the present invention, viewed from the side of the developing cartridge when counting begins; Figure 9B This is a schematic diagram showing the relative position of the counting gear and the end cap of the counting device in the developing cartridge of the present invention when counting begins; Figure 9C This is a side view of the counting device in the developing cartridge of the present invention when the counting begins, viewed along the vertical direction of the developing cartridge.

[0050] like Figure 3 As shown, the developing cartridge 100 also includes a limiting plate 10b disposed on the longitudinal end face 10a of the housing 10. After counting is completed, the limiting plate 10b is used to limit the movement range of the counting gear 31; as Figure 4As shown, the unlocking member 314 protrudes from the surface 311 of the counting gear. Along the rotation direction r2 of the counting gear 31, the unlocking member 314 has a front end 314a and a rear end 314b, and the rear end 314b protrudes further from the surface 311 than the front end 314a. Therefore, a slope 314c is formed between the front end 314a and the rear end 314b.

[0051] To more clearly display the status of each component of the counting device 30, Figure 9A The end cap 12 is hidden inside. As shown in the figure, when the developing cartridge 100 is installed into the laser printer along with the drum unit, the counting gear 31 can be engaged with the drive member 24 or the two can be disengaged. When the counting gear 31 and the drive member 24 are disengaged, the forced push part 337 can receive the force applied by the operator or the drum unit or the laser printer components (such as the laser printer door cover, inner wall, etc.), and then drive the counting gear 31 to move through the movable part 33, so that the counting gear 31 reaches the position engaged with the drive member 24. At this time, the rear end 314b of the unlocking member 314 abuts against the unlocking protrusion 1261, and the possible reverse rotation of the counting gear 31 is prevented. The locked part 336 enters the locking groove 1263. Even if the first reset member 34 applies a forced push force to the movable part 33, the movable part 33 will not move, and correspondingly, the counting gear 31 will not move.

[0052] After receiving the driving force, the driving force input component 21 begins to rotate in the direction shown in r1. The driving force is transmitted to the counting gear 31 through the driving component 24. The counting gear 31 begins to rotate around the rotation axis L1 in the direction shown in r2. When the actuating protrusion 313 actuates the force receiving part 324, the actuating component 32 begins to rotate around the rotation axis L2 in the direction shown in r3. During the process of one actuating protrusion 313 actuating the force receiving part 324, the second reset component 35 deforms. The actuating block 323 interacts with the counted part in the laser printer until the actuating protrusion 313 disengages from the force receiving part 324. Then, under the reset force of the second reset component 35, the actuating component 32 rotates around the rotation axis L2 in the opposite direction to the direction shown in r3, so that the force receiving part 324 engages with the next actuating protrusion 313, and the above process is repeated.

[0053] Figure 10A This is a schematic diagram showing the relative positions of the counting gear, drive component, and moving component of the counting device in the developing cartridge when counting is completed, according to the present invention. Figure 10B This is a schematic diagram showing the relative positions of the counting gear, drive component, and moving component when viewed vertically along the developing cartridge after the counting device in the developing cartridge of the present invention has completed counting.

[0054] When the counting device 30 is about to complete counting, the front end 314a of the unlocking member reaches a position adjacent to the unlocking protrusion 1261. The unlocking protrusion 1261 has an inclined surface corresponding to the inclined surface 314c. The inclined surface 314c gradually abuts against the inclined surface of the unlocking protrusion 1261. As the counting gear 31 continues to rotate, the unlocking member 314 causes the locking member 126 to deform by pushing the unlocking protrusion 1261. Specifically, the locking member 126 deforms in a direction away from the housing 10, and the locked part 336 disengages from the locking groove 1263. The first reset member 34 releases the pushing force, and the movable member 33 begins to rotate around the rotation axis L3 in the direction shown by r4. At the same time, under the action of the connecting part 315 and the connected part 332, the counting gear 31 is driven by the movable member 33 to rotate around the rotation axis L3 in the direction shown by r4. Figure 10B As shown, the counting gear 31 is disengaged from the driving member 24, forming a gap a between them. The driving force of the driving member 24 cannot be transmitted to the counting gear 31. At this time, the counting gear 31 remains stationary, and the forced push part 337 moves to the outside of the first through hole 121, or the forced push part 337 is exposed through the first through hole 121.

[0055] When the counting device 30 needs to be reset, as described above, through the first through hole 121, the forced push part 337 is pushed by the operator, the drum unit, or a component inside the laser printer to overcome the pushing force of the first reset member 34 on the movable member 33, causing the movable member 33 to rotate around the rotation axis L3 in a direction opposite to that shown by r4. Simultaneously, through the action of the connecting part 315 and the connected part 332, the counting gear 31 is driven by the movable member 33 to also rotate around the rotation axis L3 in a direction opposite to that shown by r4. Figure 9C As shown, the counting gear 31 returns to the position engaged with the drive unit 24.

[0056] When the counting device 30 of the present invention needs to be reset, it is not necessary to remove the end cover 12. The operator or the components inside the drum or laser printer only need to apply force to the forced push part 337 of the movable part 33 to overcome the forced push force of the first reset part 34, so that the movable part 33 drives the counting gear 31 to rotate closer to the drive part 24. This operation method is faster.

Claims

1. A developing cartridge, detachably mounted in a laser printer, characterized in that, The developing cartridge includes: The housing is used to contain the toner; The developing roller is rotatably mounted in the housing; A toner feeding roller, rotatably mounted in a housing, is used to feed toner to the developing roller; The driving device includes a driving force input component, a powder feeding roller gear, and a developing roller gear. The powder feeding roller gear is located at the end of the powder feeding roller, and the developing roller gear is located at the end of the developing roller. The driving force input component includes a driving force receiving part and a first driving gear and a second driving gear engaged with the driving force receiving part. The diameters of the driving force receiving part, the first driving gear, and the second driving gear increase sequentially. The driving force receiving part is used to receive driving force from the laser printer. The first driving gear meshes with the powder feeding roller gear, and the second driving gear meshes with the developing roller gear. The toner ejector includes a blade holder and a blade that are joined together. The blade holder is fixedly mounted on a housing. The blade holder includes a first part and a second part that are bent relative to each other, with a bend between the first part and the second part. The blade is fixed on the second part and abuts against the surface of the developing roller for adjusting the thickness of the toner layer on the surface of the developing roller. When viewed along the longitudinal direction of the developing cartridge, the driving force receiving part does not overlap with at least one of the blade and the bending part, the first driving gear does not overlap with at least one of the bending part, the second part of the blade holder and the blade, and the second driving gear overlaps with the first part of the blade holder.

2. The developing cartridge according to claim 1, characterized in that, The outer diameter of the developing roller ranges from 12mm to 19mm.

3. The developing cartridge according to claim 2, characterized in that, The outer diameter of the developing roller is 16 mm.

4. The developing cartridge according to claim 1, characterized in that, When viewed along the rotation axis of the driving force receiving section, the distance between the center point of the developing roller and the center point of the driving force receiving section is 17mm-19mm.

5. The developing cartridge as described in claim 1, characterized in that, Along the installation direction of the developing cartridge, the part where the powder discharge blade contacts the developing roller and the developing roller itself are located in front of the driving force receiving part.

6. The developing cartridge as described in claim 1, characterized in that, The developing roller and the blade are both located outside the circumference of the drive force receiving section.

7. The developing cartridge according to claim 1, characterized in that, Along the vertical direction of the developing cartridge, the first part is located above the driving force receiving part.

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