CN214409585U

CN214409585U - Developing box

Info

Publication number: CN214409585U
Application number: CN202120131761.6U
Authority: CN
Inventors: 刘录军; 万成昌
Original assignee: Zhongshan Sanrun Printing Supplies Co ltd; Ninestar Corp
Current assignee: Zhongshan Sanrun Printing Supplies Co ltd; Ninestar Corp
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2021-10-15
Anticipated expiration: 2031-01-18

Abstract

The utility model relates to a developing box, developing box includes the box body, rotatably installs developing roller in the box body, is used for receiving the power receiving piece of drive power and is located the outside drive power transmission subassembly of box body terminal surface, the power receiving piece receives external drive power, and drive power transmission subassembly includes first gear, second gear, third gear and fourth gear, and first gear combines with power receiving piece to mesh with second gear and fourth gear simultaneously, the second gear still meshes with the third gear, and the third gear is used for driving the stirring piece of rotatably installing in the box body, and the fourth gear is installed at developing roller's end; wherein the first gear, the second gear and the third gear are all mounted on the end surface, the structure of the developing cartridge is simplified, the cost thereof is reduced, and thus, the assembly process of the developing cartridge can be simplified.

Description

Developing box

Technical Field

The utility model relates to an electrophotographic image forming field especially relates to a detachably installs the development box in electrophotographic image forming apparatus.

Background

A laser printer is a commonly used electrophotographic image forming apparatus, a developing cartridge is used to supply toner when the laser printer is operated, fig. 1A is a perspective view of a conventional developing cartridge, fig. 1B is a partially exploded view of the conventional developing cartridge, the developing cartridge 100 includes a cartridge body 10, a developing roller 11 rotatably mounted on the cartridge body, and a power receiving member 20 located at a longitudinal end of the cartridge body, and when the developing cartridge 100 is operated in the laser printer, the power receiving member 20 receives a driving force from the laser printer and drives the developing roller 11 to rotate, so that the developing roller 11 supplies toner in the cartridge body 10 to the outside.

In order to enable the power receiving element 20 to be smoothly combined with the power output element in the laser printer, the developing cartridge 100 further includes two

urging members

20a and 20c and a contact member 20b, the contact member 20b is urged by one of the urging members 20c, and the other urging member 20a and the contact member 20b hold the power receiving element 20 at a predetermined position together; meanwhile, the developing cartridge 100 further includes an agitating member (not shown) rotatably installed in the cartridge body 10, and a driving force transmission assembly 40 for transmitting a driving force, as shown in the drawing, the driving force transmission assembly 40 includes a first gear 41, a second gear 42, a third gear 43, and a fourth gear 44, wherein the first gear 41 is coupled with the power receiving member 20, the second gear 42 is simultaneously engaged with the first gear 41 and the third gear 43, and the fourth gear 44 is directly engaged with the first gear 41, and thus, the driving force of the power receiving member 20 is transmitted to the respective components in the developing cartridge through the respective gears.

Further, the developing cartridge 100 further includes an end cap assembly 30 disposed on the same side as the power receiving element 20, the end cap assembly 30 not only can simultaneously serve to support and protect the driving force transmitting assembly 40 and the power receiving element 20, as shown in the figure, the end cap assembly 30 includes a first end cap 31 for supporting the first gear 41 and the second gear 42, and a second end cap 32 for supporting the

urging members

20a and 20c and the contact member 20b, the first end cap 31 is located between the distal end face 12 and the second end cap 32 of the cartridge body, the third gear 43 is mounted between the distal end face 12 and the first end cap 31, and the fourth gear 44 is directly mounted at the distal end of the developing roller 11.

As described above, the end of the existing developing cartridge 100 is not only provided with a plurality of end caps, but also the power receiving member 20 needs to be pushed by a plurality of pushing members, and the excessive end caps and pushing members not only make the parts of the developing cartridge 100 excessive and cause cost increase, but also make the assembling process of the developing cartridge 100 complicated, and thus, it is necessary to optimize the structure of the existing developing cartridge.

SUMMERY OF THE UTILITY MODEL

The utility model provides a developing box structure is simplified, is favorable to reducing its equipment degree of difficulty, realizes through adopting following technical scheme:

a developing cartridge including a cartridge body, a developing roller rotatably installed in the cartridge body, a power receiving member for receiving a driving force, and an outside driving force transfer assembly at a distal end face of the cartridge body, the power receiving member receiving an external driving force, the driving force transfer assembly including a first gear, a second gear, a third gear, and a fourth gear, the first gear being combined with the power receiving member and simultaneously engaged with the second gear and the fourth gear, the second gear being further engaged with the third gear, the third gear being for driving an agitating member rotatably installed in the cartridge body, the fourth gear being installed at a distal end of the developing roller; wherein the first gear, the second gear, and the third gear are all mounted on a distal end face.

The developing cartridge further includes an end cap located outside the cartridge body distal end face, and the driving force transmission member is located between the distal end face and the end cap.

Further, the developing cartridge further includes a holding assembly for holding the power receiving member at a predetermined position, the holding assembly being located outside the end cap, and the rotational axis of the power receiving member is kept inclined from the rotational axis of the developing roller by the holding assembly.

The retaining assembly includes at least one fixed retaining member and one movable retaining member disposed on the end cap.

Preferably, the fixed retainer is a protrusion provided on the end cap, and the movable retainer is a torsion spring provided on the end cap.

Drawings

Fig. 1A is a perspective view of a conventional developing cartridge.

Fig. 1B is a partially exploded schematic view of a conventional developing cartridge.

Fig. 2 is an exploded view of an end part of the developing cartridge according to the present invention.

Fig. 3 is a perspective view of an end cap of the developing cartridge according to the present invention.

Fig. 4 is a schematic view showing a state where the power receiving member of the developing cartridge according to the present invention is supported by the end cap.

Fig. 5A and 5B are perspective views of the developing roller gear according to the present invention.

Fig. 6 is an exploded perspective view of the developing roller gear and the cartridge according to the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. For ease of understanding, the components of the developing cartridge related to the present invention have the same numbers as those of the developing cartridge described in the background art.

Fig. 2 is an exploded view of an end part of the developing cartridge according to the present invention; fig. 3 is a perspective view of an end cap of the developing cartridge according to the present invention; fig. 4 is a schematic view showing a state where the power receiving member of the developing cartridge according to the present invention is supported by the end cap.

The developing cartridge includes a cartridge body 10, a developing roller 11 rotatably mounted in the cartridge body 10, a power receiving member 20 for receiving a driving force, and an end cap 32 and a driving force transmission assembly located outside a distal end face 12 of the cartridge body, for receiving the driving force from the outside and driving the components inside the developing cartridge to rotate, and located between the distal end face 12 and the end cap 32.

The driving force transmission assembly includes a first gear 41, a second gear 42, a third gear 43 and a fourth gear 44, the first gear 41 is combined with the power receiving part 20 and simultaneously engaged with the second gear 42 and the fourth gear 44, the second gear 42 is also engaged with the third gear 43, the second gear 42 is a duplicate gear, the third gear 43 is used for driving an agitating member (not shown) rotatably installed in the box body 10 to rotate, and the fourth gear 44 is installed at the end of the developing roller 11 and is used for driving the developing roller 11 to rotate; in the present invention, the first gear 41, the second gear 42 and the third gear 43 are all mounted on the end surface 12, and therefore, the end cover 31 in the background art can be omitted, and accordingly, the mounting procedure of the driving force transmission assembly can be simplified; in addition, there is another advantage in that, based on the closer distribution of the respective gears in the driving force transmission assembly in the longitudinal direction of the developing cartridge, the size of the respective gears in the longitudinal direction of the developing cartridge can be reduced, and thus, the material cost of the respective gears can be reduced, and at the same time, the driving force transmission between the gears combined more closely can be more stable.

Further, when the first gear 41, the second gear 42, and the third gear 43 are all mounted on the distal end face 12, the size of the cartridge body 10 in the longitudinal direction can be extended while keeping the overall longitudinal size of the developing cartridge constant, that is, the space for accommodating toner in the developing cartridge becomes large, which is advantageous for the end user to reduce the cost of use thereof. At this time, in order to ensure that the respective gears in the driving force transmission assembly do not move in the longitudinal direction of the developing cartridge, it is common in the art to mount the respective gears by means of barbs, or to provide protrusions on the side of the end cap 32 facing the distal end face 12, for example, and the details thereof will not be described herein.

As further shown in fig. 2, the cartridge further includes an urging member 20a mounted on the end cap 32, the urging member 20a being a movable torsion spring for urging the power receiving member 20 in a predetermined direction. As shown in fig. 3 and 4, the end cap 32 includes an end cap body 321, a through hole 322 provided on the end cap body, and a fixing holder 323 provided adjacent to the through hole 322, the power receiving element 20 passes through the through hole 322, generally, the through hole 322 is a circular hole, the power receiving element 20 protrudes from the through hole 322, one end of the torsion spring 20a abuts against the end cap body 321, and the other end abuts against the power receiving element 20, so that, under urging of the torsion spring 20a, the power receiving element 20 is tilted, specifically, the rotation axis of the power receiving element 20 is not parallel to the rotation axis of the developing roller 11, but is tilted relatively.

The fixing holder 323 is arranged along the circumferential direction of the circular hole 322, the power receiving element 20 is kept in contact with the fixing holder 323 under urging of the torsion spring 20a, and the power receiving element 20 is held at a predetermined position under the combined action of the torsion spring 20a and the fixing holder 323. The fixing holder 323 and the torsion spring 20a are respectively contacted with the power receiving element 20 in two directions, and the fixing holder 323 is a fixing element, which can effectively ensure that the power receiving element 20 does not deviate from a predetermined position, and at the same time, the power receiving element 20 can change its rotation axis relative to the rotation axis of the developing roller 11 by using the elasticity of the torsion spring 20a during the process of engaging and disengaging the power receiving element 20 with and from the power output element in the laser printer, thereby ensuring smooth engagement and disengagement of the power receiving element 20 with and from the power output element.

In the prior art, the two elastic pushing elements are used for pushing the power receiving element, so that the power receiving element can move in the opposite direction of the pushing direction of the two pushing elements, and at the moment, the motion track of the power receiving element is irregular and difficult to be combined with and separated from the power output element.

Preferably, the fixing holder 323 is arranged in the circumferential direction of the through hole 322, that is, the fixing holder 323 is a circular arc protrusion, and the side facing the through hole 322 is a circular arc surface concentric with the through hole 322, to ensure a constant inclination angle of the power receiving part 20, and if the fixing holder 323 is a shaped protrusion or the side facing the through hole 322 is a planar protrusion, the inclination angle of the power receiving part 20 is different from the predetermined inclination angle, and the coupling and decoupling process of the power receiving part 20 to and from the power output part may become unsmooth. Based on this idea, the fixing holder 323 can be disposed away from the through hole 322, but it is necessary to ensure that a part of the fixing holder 323 is close to the through hole 322 and that the power receiving element 20 can be brought into contact with the fixing holder 323.

In summary, the fixed retainer 323 and the torsion spring 20a of the present invention together constitute a retaining assembly for retaining the receiver 20 at a predetermined position, which can be considered as including at least one fixed retainer 323 and one movable retainer 20a disposed on the end cover 32, the retaining assembly being located on the outer side (facing the opposite side of the end face 12) of the end cover 32, not only ensuring that the receiver 20 is retained at the predetermined position before the receiver 20 is coupled to the pto, but also ensuring that the trajectory of the receiver 20 is regular during the coupling and decoupling of the receiver 20 to the pto, thereby enabling the coupling and decoupling to be smooth.

Fig. 5A and 5B are perspective views of a developing roller gear according to the present invention; fig. 6 is an exploded perspective view of the developing roller gear and the cartridge according to the present invention.

As described above, the first gear 41 is combined with the power receiving part 20, the first gear 41 including the cylindrical body 411 having the opposite outer surface 411a and inner surface 411b, the teeth 412 provided on the outer surface 411a, the intermediate plate 413 extending radially inward from the inner surface 411b, and the driving force transmitting part 414 provided on the inner surface 411b, the power receiving part 20 being accommodated in the cavity surrounded by the inner surface 411 b; the driving force transmitting portion 414 is a protrusion extending radially inward from the inner surface 411b, and accordingly, the power receiving member 20 is provided with a groove for engaging with the protrusion, or the positions of the protrusion 414 and the groove may be interchanged, that is, the groove is provided on the inner surface 414 and the protrusion is provided on the power receiving member 20.

The utility model provides a first gear 41 is because being provided with intermediate lamella 413, and the first gear among the background art is hollow form, double-phase comparison, the utility model provides a first gear 41's intensity is bigger, even first gear 41 receives radial extrusion force also difficult deformation, therefore, because the formation of image defect (for example gear line) that the gear deformation leads to just also can not produce.

As shown in fig. 5B, the first gear 41 further includes a support protrusion 416 extending from the intermediate plate 413, the support protrusion 416 being used to rotatably support the first gear 41 on the case 10, as shown in fig. 6, the case 10 is provided with a cylindrical gear mounting portion 13, and an outer surface of the support protrusion 416 is opposite to an inner surface 13a of the mounting portion 13, that is, the support protrusion 416 is supported by the mounting portion 13 surrounding from the outside, which design ensures stable mounting of the first gear 41 while reducing the radial dimension of the support protrusion 416.

As shown in fig. 5B, the first gear 41 further includes a notch 417 provided on the support projection 416 and a through-hole 415 provided on the intermediate plate 413, the notch 417, the through-hole 415, and the driving force transmitting portion 414 corresponding to each other, that is, the notch 417, the through-hole 415, and the driving force transmitting portion 414 at least partially overlap when viewed along the rotational axis of the first gear 41. In general, the driving force transmitting portion 414 is two protrusions disposed opposite to each other in the radial direction on the inner surface 411b of the cylindrical body 411, and the notch 417 and the through hole 415 are also two protrusions disposed corresponding to the driving force transmitting portion 414, and as shown in the figure, the notch 417 is disposed such that the supporting protrusion 416 is divided into two separate parts in the circumferential direction, but it is sufficient to ensure that the supporting protrusion 416 is still cylindrical as a whole and the outer surface thereof can be opposite to the inner surface 13a of the mounting portion 13. It is understood that the support protrusion 416 is provided such that the strength of the first gear 41 is further enhanced; the notch 417 need not extend through the support protrusion 416 along the rotational axis of the first gear 41, i.e., the notch 417 need not extend through the support protrusion 416 along the rotational axis of the first gear 41, and in this case, the notch 417 need only be disposed so that the mold can pass through the notch 417 through the through hole 415 to the cavity, and it is further understood that the notch 417 need not overlap the through hole 415 when viewed along the rotational axis of the first gear 41, but that the through hole 415 and the protrusion 414 at least partially overlap to achieve integration of the first gear 41.

The notch 417 and the through hole 415 are provided to integrally form the first gear 41 when the driving force transmitting portion 414 is a protrusion, and as described above, the protrusion 414 protrudes radially inward from the cylindrical inner surface 411b, and the protrusion 414 and the support protrusion 416 are respectively located on both sides of the intermediate plate 413, and when a mold is used for production, the notch 417 and the through hole 415 allow the mold to penetrate on both sides of the intermediate plate 413, so that the protrusion 414 is integrally formed with other components of the first gear 41, thereby improving the production efficiency of the first gear 41.

As above, the utility model provides a forced structure of pushing away of end cover structure, the power of developing cartridge receive 20 and the first gear structure that combines with power receive 20 is all optimized, has not only effectively reduced the equipment degree of difficulty of developing cartridge, and then reduces developing cartridge's material cost through the spare part quantity that reduces developing cartridge moreover.

Claims

1. A developing cartridge including a cartridge body, a developing roller rotatably mounted in the cartridge body, a power receiving member for receiving a driving force, and an outside driving force transmitting member at a distal end face of the cartridge body, the power receiving member receiving an external driving force,

the driving force transmission assembly includes a first gear, a second gear, a third gear and a fourth gear, the first gear being combined with the power receiving part while being engaged with the second gear and the fourth gear, the second gear being further engaged with the third gear, the third gear being for driving an agitating member rotatably installed in the cartridge body, the fourth gear being installed at an end of the developing roller;

wherein the first gear, the second gear, and the third gear are all mounted on a distal end face.

2. A developing cartridge according to claim 1, further comprising an end cap located outside the cartridge body distal end face, the driving force transmitting member being located between the distal end face and the end cap.

3. A cartridge according to claim 2, further comprising a retaining assembly for retaining the power receiver in a predetermined position, the retaining assembly being located outside the end cap.

4. A cartridge according to claim 3, wherein the rotational axis of the power receiver is inclined to the rotational axis of the developer roller by the retaining assembly.

5. A developing cartridge according to claim 3 or 4, wherein the holding member includes at least one fixed holding member and one movable holding member provided on the end cap.

6. A developing cartridge according to claim 5, wherein the fixed holder is a projection provided on an end cap, and the movable holder is a torsion spring provided on the end cap.