CN217767189U

CN217767189U - Charging roller and developing cartridge

Info

Publication number: CN217767189U
Application number: CN202221248332.8U
Authority: CN
Inventors: 谢刚
Original assignee: Zhuhai Momei Image Technology Co ltd
Current assignee: Zhuhai Momei Image Technology Co ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-11-08
Anticipated expiration: 2032-05-20

Abstract

The utility model relates to a printer technical field provides a roller charges, still provides a developing box, and wherein the roller that charges includes the roller body, and the both ends of roller body are equipped with first link and second link, form first step layer between first link and the roller body, form second step layer between second link and the roller body, and wherein, first link and second link are the cylinder end, and the coaxial setting of first link and second link is on the roller body. Compared with the prior art, the utility model greatly saves the processing time of the charging roller, reduces the processing procedures and improves the processing efficiency; meanwhile, the structural mode of the cylindrical end is adopted, so that the installation of the charging roller on the developing box is facilitated, the structural stability of the charging roller is ensured, and the charging roller is not easy to break.

Description

Charging roller and developing cartridge

Technical Field

The utility model relates to a printer technical field, concretely relates to charge roller still relates to a developing box.

Background

The charging roller is an important component in the developing cartridge for charging the surface of the photosensitive drum with a uniform charge. All have three steps on the both ends position of current roller of charging, refer to fig. 1, include by the first annular ladder that middle part to tip set up and at two installation ladders that the end position symmetry set up, form the installation end at the roller both ends position that charges, outside conducting strip then direct contact installation end to introduce electric charge to the roller that charges on, and charge for the sensitization drum through the mode of contact.

In the specific processing process of the charging roller, for processing a symmetrical installation stepped structure, an upper layer is milled at the upper end of the installation end, then a lower layer is milled at the lower end of the installation end after measurement is carried out according to the symmetrical direction, and the requirements on the processing precision and accuracy are very high, so that the production efficiency of the conventional charging roller is low, and the product passing rate is low. And because the step setting of installation end, thickness reduces a lot relatively the roller face diameter of former charge roller, leads to easy fracture, and in order to guarantee the rigidity of charge roller this moment, still need to carry out the increase processing to the diameter of charge roller, influences the spatial layout of developing box internals.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a charging roller to solve the technical problems of difficult processing and easy fracture of the current charging roller.

In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:

the charging roller comprises a roller body, wherein a first connecting end and a second connecting end are arranged at two ends of the roller body, a first step layer is formed between the first connecting end and the roller body, a second step layer is formed between the second connecting end and the roller body, the first connecting end and the second connecting end are both cylindrical ends, and the first connecting end and the second connecting end are coaxially arranged on the roller body.

Compared with the prior art, the charging roller at least has the following beneficial effects: the first connecting end and the second connecting end at the two ends of the charging roller are designed into the cylindrical ends, so that the first connecting end and the second connecting end can be processed at the two ends of the charging roller only by one turning and milling process in the processing process of the charging roller, the processing time of the charging roller is greatly saved, the processing process is reduced, and the processing efficiency is improved; meanwhile, the structural mode of the cylindrical end is adopted, so that the installation of the charging roller on the developing box is facilitated, the structural stability of the charging roller is ensured, and the charging roller is not easy to break.

Optionally, the first connecting end and the second connecting end are provided with arc-shaped transition surfaces at the edges of the end surfaces far away from the roller body.

Optionally, the diameter of the first connection end is the same as the diameter of the second connection end.

Optionally, the diameters of the first connecting end and the second connecting end are both 5mm.

Optionally, a distance between an end face of the first connection end away from the roller body and an end face of the second connection end away from the roller body is 251mm.

Optionally, the charging roller includes a metal core and an elastic layer, the elastic layer is wrapped on the metal core, and both ends of the metal core have circular conductive surfaces exposed on the elastic layer.

In order to achieve the above object, the present invention also provides a developing cartridge, including: the box body is provided with a first tightening piece and a second tightening piece in a sliding mode, and is provided with a first elastic piece connected with the first tightening piece and a second elastic piece connected with the second tightening piece; the photosensitive drum is arranged on the box body; the charging roller is characterized in that the first tightening piece is clamped on the first connecting end, the second tightening piece is clamped on the second connecting end, and the first elastic piece and the second elastic piece jointly act on the charging roller and enable the charging roller to be attached to the photosensitive drum.

Optionally, a first U-shaped bayonet is arranged on the first tightening member, a second U-shaped bayonet is arranged on the second tightening member, the first connection end is attached to the first U-shaped bayonet, and the second connection end is attached to the second U-shaped bayonet.

Optionally, the box body is further provided with a conductive sheet, and the conductive sheet is in conductive contact with the first connecting end or the second connecting end

Compared with the prior art, the developing box at least has the following beneficial effects: the charging roller is tightly pressed on the photosensitive drum in a mode of tightly pressing two ends, so that the charging roller is fully attached to the photosensitive drum, the charging roller uniformly guides charges onto the photosensitive drum, and the charging efficiency of the charging roller to the photosensitive drum is improved; the charging roller installed at the cylindrical end can reduce the size requirement of the charging roller, vacate the installation space for other components and further improve the structural compactness of the developing box.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural view of a charging roller provided in the prior art;

fig. 2 is a schematic structural diagram of a charging roller according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is an exploded view of a developing cartridge according to a second embodiment of the present invention;

fig. 5 is a schematic view of the structure of the first fastening member provided in fig. 4.

The reference numbers illustrate:

100 roller bodies, 110 first connecting ends, 120 second connecting ends, 130 first step layers, 140 second step layers, 150 arc-shaped transition surfaces and 160 circular conductive surfaces;

200, 210, a first top fastening piece, 211, a first U-shaped bayonet, 212, a first mounting column, 220, a second top fastening piece, 221, a second U-shaped bayonet, 230, a first elastic piece, 240, a second elastic piece and 250 conducting strips; 300 a photosensitive drum.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Now, a charging roller according to an embodiment of the first aspect of the present invention will be described with reference to the drawings.

Referring to fig. 2 and 3, a charging roller includes a roller body 100, a first connecting end 110 and a second connecting end 120 are disposed at two ends of the roller body 100, and the first connecting end 110 and the second connecting end 120 protrude outwards from the two ends of the roller body 100 for mounting the roller body 100 on a developing cartridge.

The first step layer 130 is formed between the first connecting end 110 and the roller body 100, the second step layer 140 is formed between the second connecting end 120 and the roller body 100, the formed first step layer 130 and the formed second step layer 140 are annular steps, and the diameter of the roller body 100 is larger than the corresponding diameters of the first connecting end 110 and the second connecting end 120.

In addition, the first connecting end 110 and the second connecting end 120 are both cylindrical ends and are cylindrical structures, the two connecting ends are coaxially arranged on the roller body 100, namely, the central axes of the first connecting end 110 and the second connecting end 120 are overlapped with the central axis of the roller body 100, and the first step layer 130 and the second step layer 140 are both annular surfaces perpendicular to the central axis of the roller body 100.

Compared with the prior art, the first connecting end 110 and the second connecting end 120 at the two ends of the charging roller are designed into the cylindrical ends, so that the first connecting end 110 and the second connecting end 120 can be processed at the two ends of the charging roller only by one turning and milling process in the processing process of the charging roller, the processing time of the charging roller is greatly saved, the processing process is reduced, and the processing efficiency is improved; meanwhile, the structural mode of the cylindrical end is adopted, so that the installation of the charging roller on the developing box is facilitated, the structural stability of the charging roller is ensured, and the charging roller is not easy to break.

In one embodiment of the present invention, the end edges of the first connecting end 110 and the second connecting end 120 away from the roller body 100 are provided with arc-shaped transition surfaces 150. This arc transition face 150 is the chamfer face that roller body 100 formed at the turn-milling in-process to the receipts sword of milling cutter, and, can effectively prevent the accident, avoid the terminal surface edge of link too sharp injury accident that leads to. In addition, the installation of the connecting end on the developing roller is facilitated, and when the connecting end enters the installation hole or the bayonet, the arc-shaped transition surface 150 plays a role in guiding in the assembling process.

Further, the diameter of the first connection end 110 is the same as that of the second connection end 120, and is smaller than that of the roller body 100. The design of the first connecting end 110 and the second connecting end 120 with the same diameter facilitates processing and installation, eliminates assembly errors caused by forward and reverse assembly, and improves assembly efficiency.

It should be noted that the size of the connecting end of the charging roller in the prior art is mostly 6mm, and in this embodiment, the diameters of the first connecting end 110 and the second connecting end 120 are both 5mm, compared with the prior art, the size of the connecting end of the charging roller is reduced, the mounting component of the charging roller on the developing cartridge can be further reduced according to the reduced size, the miniaturization and compact design is realized, the material cost is reduced, and the production cost is reduced.

In addition, the distance between the end surface of the first connection end 110 away from the roller body 100 and the end surface of the second connection end 120 away from the roller body 100 is 251mm, that is, the length of the charging roller is 251mm, which is smaller than the existing size, and also contributes to the miniaturization design of the developing cartridge and the reduction of material cost.

In another embodiment of the present invention, the charging roller includes a metal core and an elastic layer, the elastic layer is a low hardness conductive elastic layer, and after the metal core introduces current, the charge expands and contracts onto the elastic layer, and is uniformly transmitted to the photosensitive drum 300 through the elastic layer. The elastic layer enables the charging roller to have appropriate volume resistivity, so that the charging roller can be in full contact with the photosensitive drum 300 and the pressure is uniform, the required charging voltage is minimized, the charging performance is stable, the photosensitive drum 300 cannot be damaged, and a good image effect and a long service life are obtained.

Specifically, both ends of the metal core have circular conductive surfaces 160 exposed on the elastic layer, and the circular conductive surfaces 160 are used for connecting with external electrical components to make the charging roller conductive. The circular conductive surface 160 can increase the contact area between the power connection component and the metal core, and sufficiently bring the current into the charging roller.

Referring to fig. 4 and 5, a developing cartridge according to an embodiment of the second aspect of the present invention will be described.

A developing cartridge includes a cartridge body 200, a photosensitive drum 300, and the charging roller of the first aspect embodiment. The photosensitive drum 300 is provided on the cartridge body 200, and the cartridge body 200 is slidably provided with the first and

second urging members

210 and 220, and the first and second

elastic members

230 and 240.

Wherein, the both sides of box body 200 are equipped with first slide rail and second slide rail respectively, and first top piece 210 and second top piece 220 set up on first slide rail and second slide rail, and the slip direction between first slide rail and the second slide rail is the same, all faces the surface of sensitization drum 300. First top tight piece 210 is last to have first mounting post 212, has the second mounting post on the second top tight piece 220, and the one end of first elastic component 230 is supported and is leaned on box body 200, and another pot head is established on first mounting post 212, and similarly, the one end of second elastic component 240 is supported and is leaned on box body 200, and another pot head is established on the second mounting post, and two springs act on the roller that charges jointly, make the roller that charges laminate on photoreceptor drum 300.

Compared with the prior art, the utility model adopts a mode of tightly pushing two ends to tightly push the charging roller on the photosensitive drum 300, so that the charging roller is fully attached to the photosensitive drum 300, charges are uniformly drained to the photosensitive drum 300, and the charging efficiency of the charging roller on the photosensitive drum 300 is improved; the charging roller installed at the cylindrical end can reduce the size requirement of the charging roller, vacate the installation space for other components and further improve the structural compactness of the developing box.

In another embodiment of the present invention, the first fastening member 210 is provided with a first U-shaped bayonet 211, the inner side of the first U-shaped bayonet 211 is a curved semi-circular concave surface, and the diameter of the semi-circular concave surface is the same as the diameter of the first connecting end 110, so that the first connecting end 110 is attached to the first U-shaped bayonet 211, thereby improving the connection tightness of the first fastening member 210 at the first U-shaped bayonet 211. Similarly, the second fastening member 220 is provided with a second U-shaped bayonet 221, the inner side of the second U-shaped bayonet 221 is also an arc-shaped semicircular concave surface, the diameter of the second connecting end 120 is the same as that of the semicircular concave surface, and the second connecting end 120 is attached to the second U-shaped bayonet 221.

It should be noted that the opening directions of the two U-shaped bayonets face away from the arrangement positions of the mounting posts on the tightening member, so that the force application direction of the elastic member is the same as the clamping and pushing direction of the tightening member to the charging roller, and the charging roller is abutted against the photosensitive drum 300.

Further, the box body 200 is further provided with a conductive sheet 250, and the conductive sheet 250 is guided to contact the first connection end 110 or the second connection end 120 to introduce current into the charging roller.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A charging roller is characterized by comprising a roller body, wherein a first connecting end and a second connecting end are arranged at two ends of the roller body, a first step layer is formed between the first connecting end and the roller body, a second step layer is formed between the second connecting end and the roller body,

the first connecting end and the second connecting end are both cylindrical ends, and the first connecting end and the second connecting end are coaxially arranged on the roller body.

2. The charging roller according to claim 1, wherein the end face edges of the first connection end and the second connection end away from the roller body are provided with arc-shaped transition faces.

3. The charging roller as claimed in claim 1, wherein a diameter of the first connection end is the same as a diameter of the second connection end.

4. The charging roller according to claim 3, wherein the first connection end and the second connection end each have a diameter of 5mm.

5. The charging roller according to claim 1, wherein a distance between an end surface of the first connection end remote from the roller body and an end surface of the second connection end remote from the roller body is 251mm.

6. The charging roller according to claim 1, comprising a metal core and an elastic layer wrapped around the metal core, wherein both ends of the metal core have circular conductive surfaces exposed on the elastic layer.

7. A developing cartridge, characterized by comprising:

the box body is provided with a first tightening piece and a second tightening piece in a sliding mode, and is provided with a first elastic piece connected with the first tightening piece and a second elastic piece connected with the second tightening piece;

the photosensitive drum is arranged on the box body;

the charging roller according to any one of claims 1 to 6, wherein the first tightening member is engaged with the first connecting end, the second tightening member is engaged with the second connecting end, and the first elastic member and the second elastic member jointly act on the charging roller to attach the charging roller to the photosensitive drum.

8. A developing cartridge according to claim 7, wherein said first fastening member is provided with a first U-shaped bayonet, said second fastening member is provided with a second U-shaped bayonet, said first connecting end is fitted to said first U-shaped bayonet, and said second connecting end is fitted to said second U-shaped bayonet.

9. A developing cartridge according to claim 7, wherein a conductive sheet is further provided on the cartridge body, and the conductive sheet is in conductive contact with the first connecting end or the second connecting end.