CN211236568U - Processing box - Google Patents

Abstract

The utility model relates to a processing box, detachable install in electronic imaging equipment, include: a photosensitive drum on which an electrostatic latent image can be formed; a developer roller comprising a steel shaft; the developing roller gear can transmit driving force to the developing roller, the developing roller gear comprises a shaft sleeve matched with the steel shaft, the shaft sleeve is provided with a hollow part, the steel shaft can be inserted into the hollow part, the hollow part comprises an inner side surface, and the inner side surface is provided with a force application part matched with the steel shaft and used for transmitting the driving force to the steel shaft; the process cartridge further includes an extension portion, one side end of which is connected to the force application portion.

Description

Processing box

Technical Field

The utility model relates to an electronic imaging field especially relates to a processing box.

Background

The prior art discloses a small-capacity processing box, which comprises a stirring frame, a powder feeding roller, a developing roller and a photosensitive drum, wherein when the processing box works, the stirring frame receives driving force from electronic imaging equipment through a driving gear to rotate and feed powder, the developing roller and the powder feeding roller receive the driving force of the driving gear through a developing roller gear and a powder feeding roller gear to rotate, developer is conveyed to the surface of the developing roller through the action of the powder feeding roller, and then the developing step in printing is completed through the developing roller. Now, a novel large-capacity processing box is developed, the axial length of the large-capacity processing box is slightly larger than that of the small-capacity processing box, the developing rollers used by the processing box are the same except that the developing rollers used by the small-capacity processing box are long, so the developing rollers of two specifications cannot be used universally, the manufacturing cost of the photosensitive drum used by the large-capacity processing box is higher, and the cost is not saved greatly during mass production.

SUMMERY OF THE UTILITY MODEL

The utility model provides a box is handled to large capacity, its purpose is in order to solve the technical problem that this large capacity processing box manufacturing cost is high among the prior art.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

a process cartridge detachably mountable to an electronic image forming apparatus, comprising:

a photosensitive drum on which an electrostatic latent image can be formed;

a developer roller comprising a steel shaft;

the developing roller gear can transmit driving force to the developing roller, the developing roller gear comprises a shaft sleeve matched with the steel shaft, the shaft sleeve is provided with a hollow part, the steel shaft can be inserted into the hollow part, the hollow part comprises an inner side surface, and the inner side surface is provided with a force application part matched with the steel shaft and used for transmitting the driving force to the steel shaft;

the process cartridge further includes an extension portion, one side end of which is connected to the force application portion.

Further, the steel shaft further includes a tip end surface at a tip end portion thereof, the tip end surface abutting against the extension portion, the extension portion being configured in a columnar shape.

Further, the extension part is integrally arranged with the shaft sleeve.

Further, the shaft sleeve further comprises an inner bottom surface, the extending portion is a cylindrical body extending from the inner bottom surface to the developing roller, and the length of the cylindrical body in the axial direction of the shaft sleeve is 2-7 mm.

Further, the extension portion may divide the hollow portion into two parts in a circumferential direction of the shaft sleeve.

Further, the extension part and the shaft sleeve are arranged in a split mode.

Further, the force application part comprises an installation groove, and the extension part is fixed on the installation groove in an interference fit mode.

Further, the developing roller gear includes a tooth portion for receiving the driving force, and at least a part of the extension portion overlaps with the tooth portion in the sleeve axial direction.

Furthermore, the developing roller gear further comprises a convex block and an inner wall, the inner wall is parallel to the end face of the tooth part, the convex block is located on the outer circumference of the shaft sleeve, and the convex block is connected with the shaft sleeve and the inner wall and used for enhancing the strength of the shaft sleeve.

After having adopted above-mentioned technical scheme, through the design to the developer roll gear, when this developer roll gear installed in the first supporting part of developer roll, can prolong the whole axial length of developer roll and developer roll gear, make it can adapt to the large capacity and handle the box, through this improvement, significantly reduced manufacturing cost, created the product advantage, made the product more possess the competitiveness in the market.

Drawings

FIG. 1 is a schematic view of a prior art small capacity process cartridge;

FIG. 2 is a schematic view of a small capacity cartridge drive end configuration;

FIG. 3 is a schematic view of a non-drive end configuration of a small capacity process cartridge;

FIG. 4 is a schematic view of a developing roller of a small capacity process cartridge;

FIG. 5 is a schematic structural view of the driving end of the high capacity processing box of the present invention;

FIG. 6 is a schematic view showing the structure of a non-driving end of a large capacity process cartridge;

FIG. 7 is a schematic view of a short development roller and modified development roller gear assembly;

FIG. 8 is a schematic view of the side of the gear shaft of the developing roller after modification;

FIG. 9 is a schematic sectional view of a modified development roller gear;

FIG. 10 is a schematic sectional view of a developing roller gear described in embodiment 2;

fig. 11 is an exploded view of the mounting bearing 160 assembled with the developing roller 6;

fig. 12 is a schematic view of the developing roller gear shaft side described in embodiment 3.

Detailed Description

In order to make the technical solution and technical effect of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solution of the processing box of the present invention with reference to the accompanying drawings.

Example 1

There is a small capacity process cartridge in the prior art, as shown in fig. 1, which works on the principle that the process cartridge includes a developing unit 100 and a photosensitive unit 200, the developing unit 100 includes a developer storage chamber 1, an agitating frame 2, a partition wall 3, a developer chamber 4, a powder feeding roller 5, a developing roller 6, and a powder discharging blade 7, wherein the agitating frame 2 can be rotated by receiving a driving force from an electrophotographic apparatus to achieve a function of agitating and feeding powder; the partition wall 3 is located between the developer storage chamber 1 and the developer chamber 4, and the developer storage chamber 1 and the developer chamber 4 communicate through the partition wall 3. The photosensitive unit 200 includes a photosensitive drum 8, a charging roller 9, a cleaning member 10, and a waste toner hopper 11. When the process cartridge is mounted to an electronic image forming apparatus for operation, the rotating members (the charging roller 9, the photosensitive drum 8, the developing roller 6, the powder feeding roller 5 and the stirring frame 2) in the process cartridge receive a driving force from the electronic image forming apparatus to rotate, firstly, the developer can be conveyed from the developer storage chamber 1 to the developer chamber 4 by the stirring and conveying action of the stirring frame 2, the developer can be conveyed to the surface of the developing roller 6 by the conveying action of the powder feeding roller 5, a developer layer with a uniform thickness can be formed on the surface of the developing roller 6 by the action of the powder discharging blade 7, meanwhile, the charging roller 9 carries out a charging operation on the photosensitive drum 8, so that the surface of the photosensitive drum 8 forms a uniform negative charge, the surface of the photosensitive drum 8 forms an electrostatic latent image with image information after being irradiated by laser with digital information, at the moment, the photosensitive drum 8 is in contact with the developing roller 6, so that the developer on the surface of the developing roller 6 is adsorbed to the surface of the photosensitive drum, a layer of visible toner image is formed, a transfer operation can be performed next, the toner image layer on the surface of the photosensitive drum 8 is transferred to a printing material, a small amount of developer usually remains on the surface of the photosensitive drum 8 after the transfer step, in order to not affect the next printing operation, the developer remaining on the surface of the photosensitive drum 8 needs to be scraped off by the cleaning element 10, and the scraped-off residual developer is collected to the waste toner bin 11.

As shown in fig. 2 to 4, the driving end of the process cartridge includes a driving gear 14, a powder feed roller gear 13 and a developing roller gear 12, wherein the driving gear 14 is a two-stage gear including a first tooth portion 14a and a second tooth portion 14b, wherein the first tooth portion 14a is engaged with the powder feed roller gear 13, the second tooth portion 14b is engaged with the developing roller gear 12, the driving gear 14 receives a driving force from the electrophotographic apparatus and transmits the driving force to the developing roller 6 and the powder feed roller 5 through the developing roller gear 12 and the powder feed roller gear 13, respectively; the developing roller gear 12 includes a mounting hole 12a, the mounting hole 12a is fitted to the developing roller first support part 6a, the mounting hole 12a is configured as an irregular circular hole having a plane 12a1 therein, and functions to allow the developing roller gear 12 to transmit a driving force to the developing roller 6; the non-driving end of the processing box comprises a positioning hole 15 and a developing roller positioning part 6b, the positioning hole 15 is positioned on the shell protective cover, the developing roller positioning part 6b is matched with the positioning hole 15, and the positioning hole 15 can limit the radial movement of the developing roller 6; the developing roller 6 comprises a steel shaft, a developing roller body 6c, axial limiting pieces 6d and 6e, the steel shaft comprises a first supporting portion 6a and a positioning end 6b, the first supporting portion 6a comprises a stress surface 6a1, the stress surface 6a1 is matched with the plane 12a1 and used for receiving driving force of the developing roller gear, the developing roller body 6c is used for bearing developer, and the axial limiting pieces 6d and 6e are abutted to the shell and used for limiting axial movement of the developing roller 6.

There is a large capacity process cartridge which is longer in axial length than the above small capacity process cartridge and to which a developing roller adapted to the large capacity process cartridge is 3 to 7mm longer than a developing roller adapted to the small capacity process cartridge. For convenience of description, the developing roller to which the large capacity process cartridge is fitted will now be referred to as a long type developing roller, and the developing roller to which the small capacity process cartridge is fitted will be referred to as a short type developing roller. The long developing roller and the short developing roller have basically the same structure except the length, and the short developing roller cannot be adapted to the large-capacity processing box, so that the large-capacity processing box needs to use the long developing roller with higher manufacturing cost, and the cost of the large-capacity processing box is increased invisibly. In order to solve the technical problem, the developing roller gear is designed and improved, and the length of the short developing roller can be prolonged when the developing roller gear is installed on the short developing roller, so that the short developing roller can be adapted to a large-capacity processing box. The specific embodiments thereof will be described in detail below.

As shown in fig. 5 to 6, the driving end of the large capacity process cartridge includes a mounting bearing 16 located on the housing protecting cover, a second supporting portion 6b of the developing roller, a receiving end 18 for driving force of the powder feeding roller, a bearing 17 for driving end of the powder feeding roller, and a driving head 20 of the powder feeding roller, wherein the mounting bearing 16 cooperates with the second supporting portion 6b to limit the radial movement of the developing roller; the powder feeding roller driving force receiving end 18 can penetrate through the powder feeding roller driving end bearing 17 to be matched with the powder feeding roller driving head 20, the powder feeding roller driving end bearing 17 can limit radial movement of the powder feeding roller, the powder feeding roller driving head 20 comprises a driving force receiving claw 20a and a connecting hole 20b, the driving force receiving claw 20a is used for receiving driving force from an electronic imaging device, and the connecting hole 20b is matched with the powder feeding roller driving force receiving end 18a to transmit driving force to the powder feeding roller.

The non-driving end of the large-capacity processing box is provided with a gear train which comprises a developing roller gear 21, a powder feeding roller gear 22, an intermediate gear 23, an intermediate gear 24 and a stirring frame gear 25, wherein the powder feeding roller gear 22 is arranged at one end of the powder feeding roller 18 and is used for transmitting the driving force received by the powder feeding roller 18 to the gear train so as to drive the developing roller 6 to run and develop the developer into the electrostatic latent image formed on the photosensitive drum 19; the powder feeding roller gear 22 is meshed with the developing roller gear 21, the developing roller gear 21 is meshed with the intermediate gear 23, the intermediate gear 23 is meshed with the intermediate gear 24, and the intermediate gear 24 is meshed with the stirring frame gear 25.

Above for the large capacity processing box drive end and non-drive end structure, for practicing thrift the cost, the utility model discloses the short money developer roll of developer roll that well large capacity processing box used, because the less capacity processing box of large capacity processing box axial length is long, consequently, the unable direct mount of short money developer roll is to the large capacity processing box, need carry out design improvement in order to prolong developer roll length to the developer roll gear, as shown in fig. 7 to fig. 9, carry out detailed description to the structure of the developer roll gear after the improvement next.

The developing roller gear 21 includes a sleeve 21a, a first tooth portion 21b, a second tooth portion 21c, a projection 21d, a force application portion 21e, a first inner wall 21g, and a second inner wall 21h, the extension portion 21f is provided in the developing roller gear 21 and integrally provided with the developing roller gear, wherein the second inner wall 21h is a bottom surface parallel to the end surface of the first tooth portion 21b facing the developing roller 6 and located inside the first tooth portion 21b, the sleeve 21a is a cylindrical sleeve extending from the second inner wall 21h, the sleeve 21a has a hollow portion whose inner diameter is slightly larger than the outer diameter of the first support portion 6a, the first support portion 6a is insertable into the sleeve 21a, and the sleeve 21a is radially positionable on the first support portion 6 a; the projection 21d is connected with the shaft sleeve 21a and the second inner wall 21h, and is used for enhancing the strength of the shaft sleeve 21a, generally, a plurality of projections can be arranged on the outer circumference of the shaft sleeve 21 at equal intervals, and in consideration of cost and strength increasing effect, the utility model preferably adopts 4 projections arranged at equal intervals; the first tooth portion 21b is meshed with the powder feeding roller gear 22 to receive a driving force from the powder feeding roller; the second tooth portion 21c is engaged with the intermediate gear 23 for transmitting the driving force; the force application part 21e is a columnar body which is arranged by depending on the inner side wall in the hollow part of the shaft sleeve 21a, the force application part 21e comprises a top surface 21e1 and a side plane 21e2, the side plane 21e2 is used for matching with the stress surface 6a1 on the first supporting part 6a to transmit driving force, the bottom surface of the force application part 21e opposite to the top surface 21e1 is connected with a first inner wall 21g, and the first inner wall 21g is the bottom surface in the shaft sleeve 21 a; the extending portion 21f extends from the first inner wall 21g in the opening direction of the sleeve 21a, and at least a part of the extending portion 21f overlaps the first tooth portion 21b in the axial direction of the developing roller gear. Generally, the short developing roller is 2-7mm shorter than the long developing roller, and therefore, in order to compensate for the difference in axial length of the developing roller, the distance from the top surface 21f1 of the extension portion 21f abutting against the end surface of the first supporting portion 6a to the first inner wall 21g may be set to 2-7mm, without limitation, when the difference in axial length between the short developing roller and the long developing roller is not within this range, the distance from the top surface of the extension portion 21f to the first inner wall 21g may be set to a corresponding length, and in addition, the shape and structure of the extension portion 21f is not unique, considering strength and cost, the utility model discloses set the extension portion 21f to be a columnar structure, and the extension portion 21f and the shaft sleeve are integrally arranged, one of the side ends is connected with the opposing portion 21e, and the other side surface is connected with the inner side wall in the hollow portion, and divides the hollow portion.

The extension principle of the developing roller gear 21 to the developing roller 6 is that the abutment extension action of the extension portion 21f to the developing roller can extend the overall axial length of the developing roller 6 and the developing roller gear 21 when the developing roller gear 21 is mounted on the first support portion 6a of the developing roller, so that the short developing roller can be adapted to a large-capacity process cartridge.

Example 2

Next, another embodiment of the present invention will be described, as shown in fig. 10, this embodiment cancels the provision of the extension portion from the developing roller gear 21, and sets the extension portion 160a in the mounting bearing 160 on the drive end side cover, and like embodiment 1, the length of the extension portion 160a in the axial direction of the developing roller is set to 2 to 7mm, and the tip portion of the positioning end 6b on the developing roller 6 abuts against the extension portion 160a, thereby extending the length of the developing roller in the axial direction, so that the developing roller can be adapted to a large capacity process cartridge. The extension 160a has a non-unique structure, and in view of a simplified structure and stability of the developing roller during operation, the present embodiment provides the extension 160a as a pair of D-shaped posts, which are oppositely disposed in the mounting bearing 160, so that the developing roller can be smoothly operated without slipping.

Example 3

As shown in fig. 11, in the present embodiment, the extension 2100f and the sleeve 2100a are separately provided, the extension 2100f is a cylindrical member, the extension 2100f includes an upper surface 2100f2, a lower surface 2100f3 and a top surface 2100f1, the force application portion 2100e includes a mounting groove including an upper wall 2100e1 and a lower wall 2100e2, the extension 2100f is inserted into the mounting groove, the upper wall 2100e is attached to the upper surface 2100f2, the lower wall 2100e2 is attached to the lower surface 2100f3, the distance between the upper wall 2100e1 and the lower wall 2100e2 is slightly smaller than the thickness of the extension 2100f, so that the extension 2100f and the mounting groove can be fixed in the sleeve 2100a in an interference fit manner; the top surface 2100f1 abuts on the distal end surface of the first supporting portion 6a, and as in embodiment 1, the extension 2100f has a length of 2 to 7mm in the developing roller axial direction, and this extension 2100f functions to abut on one end of the developing roller 6 to extend the entire axial length of the developing roller and the developing roller gear, so that the developing roller 6 can be adapted to a large-capacity process cartridge.

The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments without departing from the spirit or scope of the present invention.

Claims (9)

1. A process cartridge detachably mountable to an electronic image forming apparatus, comprising:

a photosensitive drum (19) on the surface of which an electrostatic latent image can be formed;

a developing roller (6) comprising a steel shaft;

a developing roller gear (21), wherein the developing roller gear (21) can transmit a driving force to the developing roller (6), the developing roller gear (21) comprises a shaft sleeve (21a, 2100a) matched with the steel shaft, the shaft sleeve (21a, 2100a) is provided with a hollow part, the steel shaft can be inserted into the hollow part, the hollow part comprises an inner side surface, and the inner side surface is provided with a force application part (21e, 210e, 2100e) matched with the steel shaft and transmitting the driving force to the steel shaft;

characterized in that the process cartridge further comprises an extension portion (21f, 160a), one side end of the extension portion (21f, 160a) being connected to the urging portion (21e, 2100 e).

2. A process cartridge according to claim 1, wherein said steel shaft further includes a tip end surface at a tip end portion thereof, said tip end surface abutting said extension portion (21f, 160a, 2100f), said extension portion (21f, 160a, 2100f) being configured in a columnar shape.

3. A process cartridge according to claim 1, wherein said extension portion (21f) is provided integrally with said boss (21 a).

4. A process cartridge according to claim 3, wherein said sleeve (21a) further includes an inner bottom surface (21g), said extending portion (21f) is a cylindrical body extending from said inner bottom surface (21g) toward said developing roller, and a length of said cylindrical body in an axial direction of said sleeve (21a) is 2-7 mm.

5. A process cartridge according to claim 3, wherein said extending portion (21f) can partition said hollow portion into two portions in a circumferential direction of said boss (21 a).

6. A process cartridge according to claim 1, wherein said extension portion (2100f) is provided separately from said boss (2100 a).

7. A process cartridge according to claim 6, wherein said force applying portion (2100e) includes a mounting groove, and said extending portion (2100f) is fixed to said mounting groove by interference fit.

8. A process cartridge according to claim 1, wherein said developing roller gear includes a tooth portion (21b), said tooth portion (21b) receiving a driving force, at least a part of said extension portion (21f, 160a) overlapping with said tooth portion (21b) in an axial direction of said sleeve (21a, 2100 a).

9. A process cartridge according to claim 8, wherein said developing roller gear (21) further comprises a projection (21d) and an inner wall (21h), said inner wall (21h) being parallel to an end surface of said tooth portion (21b), said projection (21d) being located on an outer circumference of said boss (21a, 2100a), said projection (21d) being connected to said boss and said inner wall (21h) for reinforcing a strength of said boss (21 a).

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