CN219179777U

CN219179777U - Developing roller and developing cartridge

Info

Publication number: CN219179777U
Application number: CN202223449703.1U
Authority: CN
Inventors: 刘占伟
Original assignee: Zhuhai Dinglong New Material Co ltd
Current assignee: Zhuhai Dinglong New Material Co ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-06-13
Anticipated expiration: 2032-12-23

Abstract

The utility model discloses a developing roller and a developing cartridge. The developing roller of the embodiment comprises a rotating shaft and an elastic sleeve arranged on the rotating shaft; the rotating shaft is a metal shaft with an integrated structure, the metal shaft comprises a mandrel and circular jackets, the circular jackets are arranged at two opposite ends of the elastic sleeve, and the outer diameter of the circular jackets is smaller than or equal to that of the elastic sleeve. The developing cartridge of the embodiment comprises a cartridge body, a driving assembly and the developing roller, wherein the developing roller is rotatably supported at two opposite ends of the cartridge body, the driving assembly comprises a developing roller gear connected with a rotating shaft and a rotary driving force receiving part provided with a driving gear, and the developing roller gear is meshed with the driving gear. In the utility model, the developing roller rotating shaft adopts the metal shaft with an integrated structure, and the round sheath of the metal shaft can more accurately control the contact force/compression amount when the elastic sleeve is contacted with the photosensitive drum, thereby improving the imaging quality.

Description

Developing roller and developing cartridge

Technical Field

The present utility model relates to a developing cartridge for use in an electrophotographic image forming apparatus and a developing roller for use in the developing cartridge.

Background

The developing cartridge having the developing roller may be detachably mounted to the electrophotographic image forming apparatus alone or together with the drum cartridge having the photosensitive drum. In the image forming operation, the photosensitive drum is charged and exposed to form an electrostatic latent image thereon, and then the developer in the developing cartridge is supplied to the photosensitive drum by the developing roller to develop the electrostatic latent image on the photosensitive drum.

In an electrophotographic image forming apparatus employing a contact developing technique, a developing roller is required to be in contact with a photosensitive drum to perform supply of developer. Such a developing roller generally includes a rotation shaft and an elastic sleeve provided on the rotation shaft, the elastic sleeve is in elastic contact with the photosensitive drum during image formation, and a developer loaded on the elastic sleeve is transferred to the photosensitive drum; to ensure the imaging quality, the contact force/compression amount of the elastic sleeve relative to the photosensitive drum in the process needs to be precisely controlled.

In the prior art, a plastic sheath is assembled on a rotating shaft to control the contact force/compression amount of an elastic sleeve in imaging operation, and the requirements on the size of the plastic sheath and the precision of the circle run-out amount are very high. However, the sheath is assembled on the rotating shaft, so that assembly gaps and errors exist, the sheath made of plastic materials is easy to generate material shrinkage, the precision control of the size and circle run-out is difficult to ensure, abnormal sound is generated during imaging operation, and transverse white streak defects exist on formed images.

Disclosure of Invention

The main object of the present utility model is to provide a developing roller for improving image forming quality and a developing cartridge employing the same.

In order to achieve the above-mentioned main object, a first aspect of the present utility model discloses a developing roller comprising a rotation shaft and an elastic sleeve provided on the rotation shaft, opposite ends of the rotation shaft protruding from ends of the elastic sleeve; the rotating shaft is a metal shaft with an integrated structure and comprises a mandrel and circular jackets, the circular jackets are arranged at two opposite ends of the elastic sleeve, and the outer diameter of each circular jacket is smaller than or equal to that of the elastic sleeve.

According to one embodiment of the utility model, the difference between the outer diameter of the circular sheath and the outer diameter of the elastic sleeve is-0.1 mm to 0mm.

According to one embodiment of the utility model, the circular sheath is in contact with the axial end face of the elastic sleeve.

According to one embodiment of the utility model, the metal shaft is an aluminum shaft or an iron shaft with a rust-proof layer on the surface.

In order to achieve the above-mentioned main object, a second aspect of the present utility model discloses a developing cartridge comprising:

a cartridge having a developer accommodating chamber;

developing rollers rotatably supported at opposite ends of the cartridge body; the developing roller comprises a rotating shaft and an elastic sleeve arranged on the rotating shaft;

the driving assembly is arranged at one end of the box body; the driving assembly comprises a developing roller gear connected with the rotating shaft and a rotary driving force receiving piece provided with a driving gear, and the developing roller gear is meshed with the driving gear;

the rotating shaft is a metal shaft with an integrated structure, the metal shaft comprises a mandrel and circular jackets, the circular jackets are arranged at two opposite ends of the elastic sleeve, and the outer diameter of the circular jackets is smaller than or equal to that of the elastic sleeve.

According to one embodiment of the utility model, the opposite ends of the cartridge are respectively provided with a sealing member in sealing contact with the elastic sleeve and the circular sheath to form a multi-layered seal, which better prevents leakage of the developer from the end of the developing roller.

The technical scheme of the utility model has the following beneficial effects:

the pivot of developing roller adopts the metal shaft, and dabber and the circular sheath of this metal shaft have integrated into one piece structure, do not have assembly error under this structure between circular sheath and the dabber, and the circular sheath of metal material can keep fine dimensional stability for circular sheath has higher dimensional accuracy and circle and beats the volume precision, thereby can more accurate control developing roller's elastic tube contact photosensitive drum when the contact force/compression volume that produces, improves imaging quality.

In a further technical scheme, the circular sheath is in contact with the axial end face of the elastic sleeve, so that the circular sheath can be used as an axial dimension reference for molding the elastic sleeve, and the elastic sleeve is convenient to manufacture.

The objects, technical solutions and advantages of the present utility model will be more clearly described below, and the present utility model will be further described in detail with reference to the accompanying drawings and the detailed description.

Drawings

FIG. 1 is an overall construction view of an embodiment of a developing cartridge of the present utility model;

FIG. 2 is an exploded view of an embodiment of the developing cartridge of the present utility model;

fig. 3 is a structural view of a developing roller in the embodiment;

fig. 4 is a structural view of a developing roller rotation shaft in the embodiment.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, it should be understood that the following detailed description and specific examples are presented for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1 and 2, the developing cartridge of the embodiment includes a cartridge body 10 having a developer accommodating chamber, developing rollers 20 rotatably supported at opposite ends of the cartridge body 10, and a driving assembly 30 provided at one end of the cartridge body 10, and an outer side of the driving assembly 30 may be covered with a gear protecting cover 50. In the image forming operation, the driving assembly 30 rotates the developing roller 20, and the developer is supplied to the photosensitive drum by the developing roller 20.

In the embodiment, the driving assembly 30 includes a developing roller gear 32 and a rotational driving force receiving member 31, the developing roller gear 32 being connected to the rotation shaft 21 (see fig. 3) of the developing roller 20; the rotational driving force receiving member 31 has a power receiving portion 311 and a driving gear 312, the driving gear 312 being meshed with the roller gear 32; the power receiving portion 311 is exposed from the gear cover 50 for receiving a rotational driving force output from the electrophotographic image forming apparatus, thereby driving the developing roller 20 to rotate.

As shown in fig. 2, the developing cartridge of the embodiment may further include a toner feeding roller 40 rotatably supported at opposite ends of the cartridge body 10 and brought into elastic contact with the developing roller 20 to promote uniform adhesion of the developer on the surface of the developing roller 20. Correspondingly, the driving assembly 30 further comprises a powder feeding roller gear 33, and the powder feeding roller gear 33 is also meshed with the driving gear 312; wherein the driving gear 312 may be a step gear, and the powder feeding roller gear 33 and the developing roller gear 32 may be engaged with different gear portions of the step gear.

As shown in fig. 2 and 3, the developing roller 20 of the embodiment includes a rotation shaft 21 and an elastic sleeve 22 provided on the rotation shaft 21, opposite ends of the rotation shaft 21 protruding from ends of the elastic sleeve 22; the elastic sleeve 22 is for supporting the developer and is in contact with the photosensitive drum to supply the developer to the photosensitive drum. Wherein the rotating shaft 21 is a metal shaft having an integrally formed structure, such as an aluminum shaft or an iron shaft having a rust-proof layer on the surface thereof; the elastic sleeve 22 may have a single-layer or multi-layer material structure, and when the elastic sleeve 22 has a multi-layer material structure, at least a part of the material layer may be elastically deformed.

As shown in connection with fig. 3 and 4, the rotation shaft 21 includes a spindle 211 and circular sheaths 212, the circular sheaths 212 being disposed at opposite ends of the elastic sleeve 22. Wherein the outer diameter (referred to as the outer diameter) of the circular sheath 212 is smaller than or equal to the outer diameter of the elastic sleeve 22 (in the case where the elastic sleeve 22 is not subjected to the photosensitive drum contact force). Preferably, the difference in the outer diameter of the circular sheath 212 and the elastic sleeve 22 is-0.1 mm to 0mm, for example-0.05 mm.

The circular sheath 212 may be in contact with an axial end face of the elastomeric sleeve 22. In this way, when manufacturing the elastic sleeve 22, the circular sheath 212 can be used as an axial dimension positioning reference of the elastic sleeve 22, so that the elastic sleeve 22 can be manufactured conveniently. In an embodiment, the elastic sleeve 22 may be manufactured on the rotation shaft 21 through an over-molding process.

In the embodiment, the rotating shaft 21 is a metal shaft with an integrally formed structure, no assembly gap and no error exist between the mandrel 211 and the circular sheath 212, and the circular sheath 212 made of metal has good dimensional stability, so that the circular sheath 212 can be ensured to have higher dimensional and circular runout precision, and further the contact force/compression amount of the elastic sleeve 22 when contacting the photosensitive drum can be controlled more accurately, the imaging quality is improved, and abnormal noise during imaging operation is avoided.

With continued reference to fig. 2, the opposite ends of the cartridge body 10 are further provided with sealing members 60, respectively, the sealing members 60 being in sealing contact with the elastic sleeve 22 and the circular jacket 212 to achieve a multi-layered seal, better preventing leakage of the developer from the ends of the developer roller 20.

While the utility model has been described above by way of examples, it should be appreciated that the above examples are illustrative only of the possible embodiments of the utility model and should not be construed as limiting the scope of the utility model, and that equivalent substitutions or variations according to the utility model will be covered by the scope of the claims of the utility model.

Claims

1. A developing roller comprises a rotating shaft and an elastic sleeve arranged on the rotating shaft, wherein two opposite ends of the rotating shaft extend out from the end parts of the elastic sleeve; the method is characterized in that: the rotating shaft is a metal shaft with an integrated structure, and the metal shaft comprises a mandrel and a circular sheath; the circular sheath is arranged at two opposite ends of the elastic sleeve, and the outer diameter of the circular sheath is smaller than or equal to the outer diameter of the elastic sleeve.

2. The developing roller according to claim 1, wherein: the difference value of the outer diameters of the round sheath and the elastic sleeve is-0.1 mm-0 mm.

3. The developing roller according to claim 1, wherein: the circular sheath is in contact with the axial end face of the elastic sleeve.

4. The developing roller according to claim 1, wherein: the metal shaft is an aluminum shaft or an iron shaft with a rust-proof layer on the surface.

5. A developing cartridge, comprising:

a cartridge having a developer accommodating chamber;

the method is characterized in that: the rotating shaft is a metal shaft with an integrated structure, and the metal shaft comprises a mandrel and a circular sheath; the circular sheath is arranged at two opposite ends of the elastic sleeve, and the outer diameter of the circular sheath is smaller than or equal to the outer diameter of the elastic sleeve.

6. The developing cartridge according to claim 5, wherein: and sealing elements are respectively arranged at the two opposite ends of the box body, and are in sealing contact with the elastic sleeve and the circular sheath.

7. The developing cartridge according to claim 5, wherein: the difference value of the outer diameters of the round sheath and the elastic sleeve is-0.1 mm-0 mm.

8. The developing cartridge according to claim 5, wherein: the circular sheath is in contact with the axial end face of the elastic sleeve.