Developing roller and process cartridge

Abstract

The invention relates to a developing roller, which includes a metal mandrel, an intermediate layer and a conductive elastic layer; the intermediate layer includes a support structure and a conductive structure; the support structure is made of hard materials in an integrated manner, and the support structure includes an inner support cylinder , the outer support tube and the spokes connecting the inner support tube and the outer support tube, the inner support tube is set outside the metal mandrel, and the conductive elastic layer is set outside the outer support tube; the inner support tube is formed with a plurality of radially arranged first A through hole, a plurality of radially arranged second through holes are formed on the outer support cylinder; along the axial direction of the developing roller, the spokes extend from one axial end of the intermediate layer to the other axial end of the intermediate layer; conductive The structure is a conductor filled between the inner support cylinder and the outer support cylinder, and in the first through hole and the second through hole, and the conductive elastic layer is electrically connected with the mandrel through the conductor. The developing roller has the advantages of low cost, small deformation of the conductive elastic layer and the like. Furthermore, the present invention also relates to a process cartridge using the above developing roller.

Description

technical field [0001] The present invention relates to a component of an electrophotographic image forming device, in particular to a developing roller and a process box using the developing roller. Background technique [0002] Electrophotographic imaging devices such as laser printers all use a process box detachably installed therein. The process box has a housing and a developing roller rotatably supported at both ends of the housing. In order to ensure that the carbon powder formed on the working surface of the developing roller To be able to be uniform in thickness, a powder knife needs to be installed near the developing roller. Through the rotation of the developing roller and the extrusion of the powder knife, the toner between the developing roller and the powder knife is charged due to friction and the thickness is evenly distributed on the developing roller. roller work surface. [0003] see figure 1 , an existing developing roller 01 is composed of a metal ma...

AI Technical Summary

Problems solved by technology

However, in order to make the resistivity and hardness of the non-metallic conductive foaming layer meet the corresponding requirements, the selection of foaming layer materials is limited; in addition, there are still problems of corresponding deformation and large diameter of the metal mandrel.

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