Developing cartridge

Abstract

The present invention relates to a developing cartridge detachably mounted in a laser printer, comprising: a housing; a developing roller; the driving device comprises a driving force input piece and a developing roller gear, the driving force input piece comprises a driving force receiving part and a second driving gear, the driving force receiving part is used for receiving driving force from the laser printer, and the second driving gear is meshed with the developing roller gear; the doctor blade comprises a knife rest and a blade which are combined with each other, the knife rest comprises a first part and a second part which are oppositely bent, a bent part is formed between the first part and the second part, and the blade is fixed on the second part, abuts against the surface of the developing roller and is used for adjusting the thickness of a carbon powder layer on the surface of the developing roller; when observed in the longitudinal direction of the developing box, the driving force receiving part is not overlapped with the blade and the bending part, the second driving gear is overlapped with the first part of the knife rest, 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 doctor blade can be reduced.

Description

[0001] This invention patent application is a divisional application of the Chinese invention patent application with the invention name “Counting device and developing box” and application number 202110381890.5 submitted by the applicant to the China Patent Office on April 9, 2021. Technical Field

[0002] The invention relates to the field of electronic photographic imaging, and in particular to a developing box detachably installed in an electronic photographic imaging device. Background Art

[0003] A laser printer is a commonly used electronic photographic imaging device. A developing cartridge is a consumable item that can be detachably installed in a laser printer and contains toner. The developing cartridge includes a driving force input component for receiving driving force from the laser printer, a developing roller for conveying toner to the outside, and a powder discharge knife for adjusting the thickness of the toner layer on the surface of the developing roller. The powder discharge knife is in contact with the outer surface of the developing roller. Along the length direction of the developing cartridge, the driving force input component is arranged at one of the ends, and the powder discharge knife and the developing roller are arranged in the length direction. At the moment when the driving force input component receives the driving force from the laser printer, the driving force will cause the driving force input component to vibrate. When the vibration is transmitted to the developing roller and the powder discharge knife, the contact state between the developing roller and the powder discharge knife may change, thereby affecting the imaging quality of the developing cartridge. Summary of the invention

[0004] The present invention provides a developing box to solve the above technical problems, and the specific solution is as follows:

[0005] A developing box is detachably installed in a laser printer, and the developing box includes: a shell for accommodating carbon powder; a developing roller rotatably installed in the shell; a driving device including a driving force input member and a developing roller gear, wherein the developing roller gear is located at the end of the developing roller, the driving force input member includes a driving force receiving portion and a second driving gear combined with the driving force receiving portion, the driving force receiving portion is used to receive driving force from the laser printer, the diameter of the second driving gear is larger than the diameter of the driving force receiving portion, and the second driving gear is meshed with the developing roller gear; a powder discharge knife includes a knife holder and a blade combined with each other, the knife holder is fixedly installed on the shell, the knife holder includes a first part and a second part that are relatively bent, a bending portion is formed 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, and is used to adjust the thickness of the carbon powder layer on the surface of the developing roller; when observed along the longitudinal direction of the developing box, the driving force receiving portion does not overlap with the blade and the bending portion, and the second driving gear overlaps with the first part of the knife holder.

[0006] In some embodiments, the developing box also includes a powder feeding roller rotatably mounted in the shell and a powder feeding roller gear located at the end of the powder feeding roller, wherein the powder feeding roller is used to transport carbon powder to the developing roller; the driving device also includes a first driving gear combined with the driving force receiving portion, and the first driving gear is meshed with the powder feeding roller gear; when viewed along the longitudinal direction of the developing box, the first driving gear does not overlap with at least one of the bending portion, the second portion of the knife holder and the blade.

[0007] In some embodiments, the developer roller has a diameter in the range of 12 mm to 19 mm.

[0008] In some embodiments, the developer roller has a diameter value of 16 mm.

[0009] In some embodiments, when viewed along the rotation axis of the driving force receiving portion, a distance between a center point of the developing roller and a center point of the driving force receiving portion is 17 mm to 19 mm.

[0010] In some embodiments, along the installation direction of the developing box, the portion where the powder discharge knife contacts the developing roller and the developing roller are both located in front of the driving force receiving portion.

[0011] In some embodiments, the developing roller and the blade are both located outside the circumferential range of the driving force receiving portion.

[0012] In some embodiments, along the vertical direction of the developing cartridge, the first portion is located above the driving force receiving portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 and Figure 2 It is a three-dimensional view of the developing box involved in the present invention.

[0014] Figure 3 It is a partial component exploded schematic diagram of the developing box involved in the present invention.

[0015] Figure 4 It is a stereoscopic diagram of a counting gear in a developing box according to the present invention.

[0016] Figure 5A and Figure 5B The present invention is a stereoscopic diagram of a shifting member of a counting device in a developing box.

[0017] Figure 6 It is a three-dimensional diagram of a movable part of a counting device in a developing box according to the present invention.

[0018] Fig. 7A It is a stereoscopic view of the developer box end cover according to the present invention observed from the outside.

[0019] Figure 7B It is a stereoscopic view of the developer box end cover according to the present invention observed from the inside.

[0020] Figure 8 It is a schematic diagram of the relative positions of the developing roller, the powder discharge knife and the driving force receiving gear when the developing box involved in the present invention is observed along a direction parallel to its longitudinal direction.

[0021] Fig. 9A It is a side view of the developing box according to the present invention when the counting device in the developing box starts counting, as viewed from the side of the developing box.

[0022] Fig. 9B The present invention is a schematic diagram of the relative positions of the counting gear and the end cover when the counting device in the developing box of the present invention starts counting.

[0023] Fig. 9C It is a side view of the counting device in the developing box involved in the present invention when it starts counting, when viewed along the vertical direction of the developing box.

[0024] Fig. 10A The present invention is a schematic diagram of the relative positions of a counting gear, a driving member and a movable member of the counting device in the developing box when the counting device in the present invention completes counting.

[0025] Fig. 10B The present invention is a schematic diagram of the relative positions of a counting gear, a driving member and a movable member when the counting device in the developing box involved in the present invention is observed along the vertical direction of the developing box when counting is completed. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described below in conjunction with the following drawings. It should be understood that any changes made to the embodiments of the present invention by those skilled in the art according to the following description should be deemed to be within the protection scope of the present invention.

[0027] Figure 1 and Figure 2 is a three-dimensional diagram of a developing box according to the present invention; Figure 3 It is a partial component exploded schematic diagram of the developing box involved in the present invention.

[0028] The developing box 100 can be combined with a drum frame (not shown) to form a processing box, and the developing box 100 or the processing box is detachably installed in a laser printer provided with a counter. The developing box 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 a direction pointing from the bottom of the developing box 100 to the top when the developing box 100 is normally placed. The direction parallel to the x direction is defined as the longitudinal direction, the direction parallel to the y direction is defined as the lateral direction, and the direction parallel to the z direction is defined as the vertical direction.

[0029] The developing box 100 includes a shell 10 for accommodating carbon powder, a developing roller 11 rotatably mounted in the shell 10, a powder discharge knife 14 and a powder feeding roller 15 in contact with the developing roller 11, a driving device 20 and a counting device 30 located at the longitudinal ends of the shell, and an end cover 12 arranged on the same side as the counting device 30. The powder feeding roller 15 conveys carbon powder to the developing roller 11 and is supplied outward by the developing roller 11. The powder discharge knife 14 abuts against the outer surface of the developing roller 11 to adjust the thickness of the carbon powder layer on the outer surface of the developing roller 11. The counting device 30 can be arranged on the same side as the driving device 20, and the two can also be respectively located at the two longitudinal ends of the shell 10. No matter how the two are distributed, the driving force required for the counting device 30 to work is supplied by the driving device 20, that is, after the driving device 20 receives the driving force from external components such as a laser printer, the developing roller 11, the powder feeding roller 15 and the counting device 30 are all driven to work.

[0030] like Figure 2 As shown, the driving force input member 21 for receiving the driving force in the driving device 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 for receiving the reset force in the counting device 30 is exposed from the rear end of the end cover 12, so that the operator can reset the counting device 30, or during the installation or removal of the developing box 100, the components in the drum frame or the laser printer force the counting device 30 to reset.

[0031] like Figure 3 As shown, the powder discharge knife 14 includes a knife holder 141 and a blade 142 which are combined with each other, wherein the knife 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 member 21, a developing roller gear 22, a powder feeding roller gear 23 and at least one intermediate gear 24, the driving force input member 21 includes a driving force receiving portion 211 and a first driving gear 212 and a second driving gear 213 combined with the driving force receiving portion 211, the diameters of the driving force receiving portion 211, the first driving gear 212 and the second driving gear 213 are increased successively, the driving force receiving portion 211 receives driving force from the outside, the first driving gear 212 is meshed with the powder feeding roller gear 23, and the second driving gear 213 is meshed with the developing roller gear 22, when the driving force input member 21 receives the driving force, the developing roller gear 22, the powder feeding roller gear 23 and the at least one intermediate gear 24 are all driven, so that the developing roller 11 and the powder feeding roller 15 start to rotate.

[0032] 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 is meshed with the driving gear 24. When the driving gear 24 starts to rotate, the counting gear 31 is driven. It can be realized that the driving force of the counting gear 31 can also be generated by the friction between the rubber layer provided on the outer surface of the driving gear 24 and the counting gear 31, or the driving gear 24 and the counting gear 31 are both replaced by rubber wheels. Therefore, the driving gear 24 can be regarded as one of the driving members for driving the counting gear 31 to rotate, and the counting gear 31 can be regarded as one of the driven members; the toggle member 32 is formed separately from the counting gear 31, and the two are eccentrically arranged. As the counting gear 31 rotates, the toggle member 32 is toggled by the counting gear 31 at intervals. When the toggle member 32 is toggled, the toggle member 32 and the laser The counted part in the printer interacts with each other to complete the laser printer's identification of the developing box 100; a part of the movable member 33 is coaxially arranged with the counting gear 31, and under the forced thrust of the first reset member 34, the movable member 33 has a tendency to move away from the driving member 24, or in other words, the movable member 33 has a tendency to disengage from the driving member 24. After counting is completed, the counting gear 31 is disengaged from the driving member 24 under the drive of the movable member 33. When the counting device 30 needs to be reset, the counting gear 31 is driven by the movable member 33 to return to the position of being combined with the driving member 24 by applying a forced thrust to the movable member 33 to overcome the first reset member 34. In other words, the counting gear 31 in the present invention can be moved between the position of being combined with the driving member 24 and the position of being disengaged from the driving member 24 under the drive of the movable member 33.

[0033] The first reset member 34 may generate the thrust force by using an elastic member or a magnetic member. Preferably, the first reset member 34 is a torsion spring, one end of which abuts against the housing 10, and the other end abuts against the movable member 33; Figure 3 As shown, in order to ensure that the toggle member 32 can stably receive the toggle force from the counting gear 31, the counting device 30 also includes a second reset member 35 combined with the toggle member 32, and the second reset member 35 forces the toggle member 32 to return to a position where it can receive the toggle 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 combined with the toggle member 32, and the other end is combined with the end cover 12.

[0034] Figure 4 is a three-dimensional diagram of a counting gear in a developing box according to the present invention; Figure 5A and Figure 5B It is a three-dimensional diagram of a toggle member of a counting device in a developing box according to the present invention; Figure 6 It is a three-dimensional diagram of a movable part of a counting device in a developing box according to the present invention;

[0035] Fig. 7Ais a three-dimensional view of the end cover of the developing box according to the present invention observed from the outside; Figure 7B It is a stereoscopic view of the developer box end cover according to the present invention observed from the inside.

[0036] The counting gear 31 can rotate around the rotation axis L1, and includes teeth 312 arranged on the outer circumference, at least one toggle protrusion 313 arranged on a surface 311, and an unlocking member 314 that can rotate with the counting gear. The teeth 312 are combined with the driving member 24 to receive the driving force. The toggle protrusion 313 is arranged along the circumferential direction of the counting gear 31. The number and shape of the toggle protrusion 313 can be determined according to the amount of developer box information required to be recognized by the laser printer. For example, the laser printer can determine the life information of the developer box according to the number of toggle protrusions 313, or the laser printer can also determine the model and other information of the developer box according to the length of the toggle protrusion 313 in the circumferential direction of the counting gear 31. When the toggle protrusion 313 is set to multiple, the multiple toggle protrusions 313 are arranged at intervals; the unlocking member 314 is used to release the lock of the movable member 33, which will be described in detail below.

[0037] like Figure 4 As shown, the counting gear 31 also includes a coupling portion 315 disposed therein, and the coupling portion 315 is used to couple with a portion of the movable member 33, so that after the counting device 30 completes counting, the counting gear 31 can move along with the movement of the movable member 33. Specifically, the coupling portion 315 is an axial hole coaxially disposed with the rotation axis L1 and protruding from the surface 311, and correspondingly, a protruding column 332 (such as Figure 6 As shown), or, the protruding column 332 is arranged on the counting gear 31, and the axial hole is arranged on the movable part 33; the axial hole or the protruding column 332 may be deformable, and it is not necessary to be arranged coaxially with the rotation axis L1, but it is arranged on the counting gear 31 in parallel with the rotation axis L1 or relatively inclined, as long as the counting gear 31 can move with the movement of the movable part 33.

[0038] The toggle member 32 and the counting gear 31 are arranged eccentrically. When the counting gear 31 rotates, the toggle protrusion 313 toggle the toggle member 32 to rotate, thereby causing the toggle member 32 to interact with the counted part. Compared with the existing structure in which the toggle member 32 and the counting gear 31 are concentrically arranged, the toggle member 32 in the present invention is not only separately arranged from the counting gear 31, but the two are also relatively eccentric. Therefore, the developer box manufacturer can change the relative position of the toggle member 32 and the counting gear 31 according to the different positions of the counted part in the laser printer, without having to redesign the counting gear 31, which is beneficial to reducing the production cost of the developer box manufacturer.

[0039] The toggle member 32 includes a base 321 rotatable around a rotation axis L2, a middle portion 322 protruding outward from the base 321, a toggle block 323 and a force-bearing portion 324 arranged on the middle portion 322, the force-bearing portion 324 abuts against a toggle protrusion 313 on the counting gear 31, when the counting gear 31 rotates, the toggle protrusion 313 pushes the force-bearing portion 324 to cause the toggle member 32 to rotate around the rotation axis L2, and at the same time, the toggle block 323 interacts with the counted portion, along the rotation axis L2, the toggle block 323 and the force-bearing portion 324 are respectively located on both sides of the middle portion 322, during the rotation of the toggle member 32, the interaction between the toggle block 323 and the counted portion and the interaction between the force-bearing portion 324 and the toggle protrusion 313 may not be affected, and the complexity of the developing box may be reduced.

[0040] The movable member 33 includes a main body 331, a rotating portion 333 and a coupled portion (protruding column) 332 arranged on the main body 331. Under the forced pushing action of the first reset member 34 or when overcoming the forced pushing force of the first reset member 34, the movable member 33 can rotate around the rotation axis L3 through the rotating portion 333. As described above, preferably, the protruding column 332 is coaxially arranged with the counting gear 31, that is, the rotation axis L1 passes through the protruding column 332. At this time, the rotation axis L1 and the rotation axis L3 are parallel to each other, and the movable member 33 moves in a plane perpendicular to the rotation axis L1. Figure 6 As shown, the movable member 33 also includes a positioning portion 334, a locked portion 336 and a forced pushing portion 337 arranged on the main body 331. Preferably, the positioning portion 334, the locked portion 336 and the forced pushing portion 337 are all formed integrally with the main body 331. One end of the first reset member 34 is received by the positioning portion 334, and the locked portion 336 is used to combine with an external locking member to prevent the movable member 33 from rotating around the rotation axis L3 under the forced push of the first reset member 34, so that the protruding column 332 and the coupling portion 315 of the counting gear 31 remain relatively stationary. At this time, the counting gear 31 remains coupled to the driving member 24; when the counting device 30 needs to be reset, the forced pushing portion 337 receives a force from the outside to overcome the forced pushing force applied by the first reset member 34 to the movable member 33, so that the movable member 33 rotates around the rotation axis L3, and then drives the counting gear 31 back to the position coupled with the driving member 24 through the protruding column 332.

[0041] It is feasible that the locked portion 336 and the forced pushing portion 337 are formed separately from the main body 331. At this time, the locked portion 336 and the main body 331, as well as the forced pushing portion 337 and the main body 331 are connected by connecting parts, and when the locked portion 336 is locked by an external locking member, the main body 331 is also locked, and when an external force is applied to the forced pushing portion 337, the main body 331 can also rotate around the rotation axis L3.

[0042] The end cover 12 includes an end cover body 120, a first through hole 121, a second through hole 122 and a third through hole 125 provided on the end cover body 120, wherein the first through hole 121 is generally opened in the y direction and faces the rear end in the mounting direction of the developing cartridge, and its specific shape is not limited, that is, the first through hole 121 may be circular or polygonal, etc., the second through hole 122 and the third through hole 125 extend in the x direction, the counting device 30 is exposed through the second through hole 122, and the driving force receiving portion 211 is exposed through the third through hole 125; Fig. 7A and Figure 7B As shown, the end cover 12 also includes a cover 123 arranged 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 cover body 120 toward the shell body. The counting gear 31 is opposite to the positioning post 124, but the positioning portion 127 will not limit the movement of the counting gear 31. The movable member 33 is supported and positioned by the positioning post 127, the toggle member 32 is supported and positioned by the positioning post 129, and one end of the second reset member 35 is connected to the positioning post 128.

[0043] Furthermore, the end cover 12 also includes a locking piece 126 arranged adjacent to the second through hole 122, that is, the locking piece 126 in the present invention is arranged on the end cover 12. Of course, the locking piece 126 can also be arranged on the shell 10. The following description takes the locking piece 126 arranged on the end cover 12 as an example.

[0044] Preferably, the locking member 126 is formed as a part of the end cover body 120, and the locking member 126 can be deformed relative to the end cover body 120, such as Figure 7B As shown, an unlocking protrusion 1261 and a limit block 1262 are provided on the side of the locking member 126 facing the shell 10, and a locking portion 1263 is formed between the locking protrusion 1261 and the limit block 1262, and the locking portion 1263 is formed as a locking groove. When the locked portion 336 enters the locking groove 1263, the movable member 33 is locked and cannot be forced to move by the first reset member 34.

[0045] Figure 8 It is a schematic diagram of the relative positions of the developing roller, the powder discharge knife and the driving force receiving gear when the developing box involved in the present invention is observed along a direction parallel to its longitudinal direction.

[0046] As described above, when the developer box 100 is working, the driving force receiving portion 211 needs to receive the driving force from the laser printer, and drives the powder 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 powder knife includes a first portion 141a and a second portion 141b that are relatively bent. Preferably, a bending portion 141c with an angle of 90° is formed between the first portion 141a and the second portion 141b, and the blade 142 is fixed on the second portion 141b. When the powder knife 14 is fixed to the housing 10, the first portion 141a and the second portion 141b are mutually limited to ensure that the powder knife 14 is stably mounted on the housing 10.

[0047] The driving force input member 21 is combined with the shell 10 through the bracket 13. During the process of the driving force receiving part 211 receiving the driving force from the outside, the process of transmitting the driving force between the first driving gear 212 and the powder feeding roller gear 23, and the process of transmitting the driving force between the second driving gear 213 and the developing roller gear 22, vibrations will be generated between the two mutually combined parts. In particular, at the moment when the driving force receiving part 211 receives the driving force, the entire driving force input member 21 will produce a large vibration. When the vibration is transmitted to the powder discharge knife 14 and the developing roller 11 through the shell 10, it may cause the abutment state between the powder discharge knife 14 and the developing roller 11 to change.

[0048] In order to reduce the influence of the vibration transmission on the relative position between the powder discharge knife 14 and the developing roller 11, as Figure 8 As shown, when observed along the x direction of the developing box, at least the driving force receiving portion 211 does not overlap with the powder outlet knife 14. At the moment when the driving force receiving portion 211 receives the driving force, the vibration transmitted to the powder outlet knife 14 and the developing roller 11 can be reduced, or at least the driving force receiving portion 211 does not overlap with at least one of the bending portion 141c and the blade 142. In this way, even if vibration is transmitted to the powder outlet knife 14, the vibration can only affect the first part 141a of the knife holder, and will not affect the second part 141b of the knife holder and the blade 142 installed on the second part 141b of the knife holder.

[0049] like Figure 8As shown, along the installation direction y of the developer box, the developing roller 11 and the blade 142 are both located in front of the driving force receiving portion 211, or in other words, the developing roller 11 and the blade 142 are both located outside the circumferential range of the driving force receiving portion 211, and along the vertical direction z, the first part 141a of the knife holder is located above the driving force receiving portion 211. While reducing the influence of vibration on the relative position between the powder discharge knife 14 and the developing roller 11, the outer diameter of the developing roller 11 can be reduced when the size of the developing box 100 along the installation direction is determined, thereby reducing the material cost of the developing roller 11. In the present invention, the outer diameter d of the developing roller 11 can be selected within the range of 12mm-19mm, preferably 16mm, and the distance between the center point A of the developing roller 11 and the center point B of the driving force receiving member 21 (driving force receiving portion) is 17mm-19mm.

[0050] Furthermore, when observed along the longitudinal direction of the developer box 100, the first drive gear 212 does not overlap with at least one of the bending portion 141c, the second portion of the knife frame 141b and the blade 142, and thus, the influence of the vibration generated when the driving force is transmitted between the first drive gear 212 and the powder feeding roller gear 23 on the blade 142 is reduced.

[0051] Fig. 9A It is a side view of the counting device in the developing box according to the present invention when starting to count, observed from the side of the developing box; Fig. 9B It is a schematic diagram of the relative positions of the counting gear and the end cover when the counting device in the developer box of the present invention starts counting; Fig. 9C It is a side view of the counting device in the developing box involved in the present invention when it starts counting, when viewed along the vertical direction of the developing box.

[0052] like Figure 3 As shown, the developer box 100 further includes a limit plate 10b disposed on the longitudinal end surface 10a of the housing 10. After the counting is completed, the limit plate 10b is used to limit the moving range of the counting gear 31; Figure 4 As shown, the unlocking member 314 is formed by protruding from the counting gear surface 311. 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 farther than the front end 314a relative to the surface 311, thereby forming a slope 314c between the front end 314a and the rear end 314b.

[0053] In order to more clearly display the status of each component of the counting device 30, Fig. 9AThe end cap 12 is hidden in the middle. As shown in the figure, when the developing box 100 is installed to the laser printer along with the drum frame, the counting gear 31 can be in a combined state with the driving member 24, or the two can be in a mutually separated and uncombined state. When the counting gear 31 and the driving member 24 are in a mutually separated and uncombined state, the forced pushing portion 337 can receive the force applied by the operator or the drum frame or the components of the laser printer (such as the door cover, inner wall, etc. of the laser printer), and then drive the counting gear 31 to move through the movable member 33, so that the counting gear 31 reaches the position combined with the driving 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 stopped, and the locked portion 336 enters the locking groove 1263. Even if the first reset member 34 applies a forced pushing force to the movable member 33, the movable member 33 will not move, and accordingly, the counting gear 31 will not move.

[0054] After receiving the driving force, the driving force input member 21 starts to rotate in the direction indicated by r1, and the driving force is transmitted to the counting gear 31 through the driving member 24. The counting gear 31 starts to rotate around the rotation axis L1 in the direction indicated by r2. When the toggle protrusion 313 toggles the force-bearing portion 324, the toggle member 32 starts to rotate around the rotation axis L2 in the direction indicated by r3. In the process of a toggle protrusion 313 toggling the force-bearing portion 324, the second reset member 35 is deformed, and the toggle block 323 interacts with the counted portion in the laser printer until the toggle protrusion 313 is disengaged from the force-bearing portion 324. Then, under the action of the reset force of the second reset member 35, the toggle member 32 rotates around the rotation axis L2 in the direction opposite to the direction indicated by r3, so that the force-bearing portion 324 is combined with the next toggle protrusion 313, and the above process is repeated.

[0055] Fig. 10A It is a schematic diagram of the relative positions of the counting gear, the driving member and the movable member of the counting device in the developing box of the present invention when the counting device completes counting; Fig. 10B The present invention is a schematic diagram of the relative positions of a counting gear, a driving member and a movable member when the counting device in the developing box involved in the present invention is observed along the vertical direction of the developing box when counting is completed.

[0056] 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, and the unlocking protrusion 1261 has an inclined surface corresponding to the inclined surface 314c, and 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 forces the unlocking protrusion 1261 to deform the locking member 126. Specifically, the locking member 126 deforms in a direction away from the shell 10, and the locked portion 336 disengages from the locking groove 1263. The first reset member 34 releases the forced thrust, and the movable member 33 begins to rotate around the rotation axis L3 in the direction indicated by r4. At the same time, under the action of the coupling portion 315 and the coupled portion 332, the counting gear 31 is driven by the movable member 33 to rotate around the rotation axis L3 in the direction indicated by r4. Fig. 10B As shown, the counting gear 31 is disengaged from the driving member 24, and a gap a is formed therebetween. 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 pushing portion 337 moves to the outside of the first through hole 121, or the forced pushing portion 337 is exposed through the first through hole 121.

[0057] When the counting device 30 needs to be reset, as described above, the forced pushing portion 337 is forced to push by the operator or the drum frame or the components in the laser printer through the first through hole 121 to overcome the forced pushing force of the first reset member 34 on the movable member 33, so that the movable member 33 rotates around the rotation axis L3 in the direction opposite to the direction indicated by r4. At the same time, through the action of the coupling portion 315 and the coupled portion 332, the counting gear 31 is driven by the movable member 33 to rotate around the rotation axis L3 in the direction opposite to the direction indicated by r4, as shown in FIG. Fig. 9C As shown, the counting gear 31 returns to the position where it is engaged with the driving member 24.

[0058] When the counting device 30 involved in the present invention needs to be reset, there is no need to remove the end cover 12. The operator or the drum frame or the components inside the laser printer only need to apply a force to the forced pushing portion 337 of the movable part 33 to overcome the forced pushing force of the first reset part 34, forcing the movable part 33 to drive the counting gear 31 to rotate toward the driving part 24. This operation method is faster.

Claims

1. A developing cartridge, detachably mounted in a laser printer, characterized in that: The developer box includes: A housing for containing carbon powder; A developing roller is rotatably mounted in the housing; The driving device comprises a driving force input member and a developing roller gear, wherein the developing roller gear is located at the end of the developing roller, the driving force input member comprises a driving force receiving portion and a second driving gear combined with the driving force receiving portion, wherein the driving force receiving portion is used to receive the driving force from the laser printer, the diameter of the second driving gear is larger than the diameter of the driving force receiving portion, and the second driving gear is meshed with the developing roller gear; A powder discharge knife comprises a knife frame and a blade which are combined with each other, the knife frame is fixedly mounted on the housing, the knife frame comprises a first part and a second part which are bent relative to each other, a bending portion is formed 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, and is used to adjust the thickness of the carbon powder layer on the surface of the developing roller; When viewed along the longitudinal direction of the developing cartridge, the driving force receiving portion does not overlap with the blade and the bent portion, and the second driving gear overlaps with the first portion of the blade holder.

2. The developing cartridge according to claim 1, characterized in that: The developing box further comprises a powder feeding roller rotatably mounted in the housing and a powder feeding roller gear located at the end of the powder feeding roller, wherein the powder feeding roller is used to feed carbon powder to the developing roller; The driving device further comprises a first driving gear coupled to the driving force receiving portion, wherein the first driving gear is meshed with the powder feeding roller gear; When viewed along the longitudinal direction of the developing cartridge, the first driving gear does not overlap with at least one of the bent portion, the blade holder second portion, and the blade.

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

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

5. The developing cartridge according to claim 1, wherein: When viewed along the rotation axis of the driving force receiving portion, the distance between the center point of the developing roller and the center point of the driving force receiving portion is 17 mm to 19 mm.

6. The developing cartridge according to claim 1, wherein: Along the installation direction of the developing box, the part where the powder discharge knife contacts the developing roller and the developing roller are both located in front of the driving force receiving part.

7. The developing cartridge according to claim 1, wherein: The developing roller and the blade are both located outside the circumferential range of the driving force receiving portion.

8. The developing cartridge according to claim 1, wherein: The first portion is located above the driving force receiving portion in a vertical direction of the developing cartridge.

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