Torque receiving unit, photosensitive drum and process cartridge

Abstract

The present invention relates to a torque receiving assembly and a photosensitive drum and a process cartridge having the torque receiving assembly as its constituent parts. The torque receiving assembly includes a body and a driven rod. The driven rod includes a guide column and an input head located on one side of the length direction of the guide column. On the outer end wall of the input head facing away from the guide column along the length direction of the guide column, a protrusion extending outward along the length direction of the guide column is provided. The H value of the protrusion satisfies the following relationship: h<H≤h+r; where: H is the distance between the protrusion from the outer end wall to the end point extending outward; h is the torque transmitted by the engagement of the driving rod and the driven rod , the distance from the outer end wall to the centerline of the cylindrical output tooth; r is the radius of the cylindrical output tooth. It has the advantages of stable torque transmission and smooth disengagement.

Description

technical field [0001] The present invention relates to a torque receiving assembly for transmitting rotational force, and a photosensitive drum and a process cartridge having the torque receiving assembly as its constituent parts. Background technique [0002] The process cartridge, which basically constitutes the core of the laser printer's imaging process, is that the surface of the photosensitive drum is uniformly charged by the charging roller. The laser scanner emits a modulated laser beam containing image information to the outer cylindrical surface of the photosensitive drum. After being irradiated by the laser beam, a static charge distribution map with different distributions is formed on the cylindrical surface of the photosensitive drum, that is, it is different from the image to be printed. Corresponding electrostatic latent image. After that, the developer such as toner from the developing roller is adsorbed on the surface of the photosensitive drum after pass...

AI Technical Summary

Problems solved by technology

[0006] However, in the torque receiving assembly of CN103376696A, when the process box needs to be taken out from the laser printer during actual use, the process box cannot be taken out smoothly, that is, there is a "stuck" phenomenon. After research, it is found that: Although the driving rod 200 can reliably transmit the torque after being engaged with the driven rod 2, and it works stably, but when the operation stops, because the stop position, that is, the angle of rotation with respect to the process cartridge taking-out direction is random, there will be The engaged position is the dead center position that is substantially perpendicular to the removal direction of the process cartridge. When it is at this position, the direction of removing the process cartridge is opposite to the direction of force that drives the engagement, and as image 3 , the distance H of the projection 24 from the outer end wall 23 to the apex extending outward along the length direction of the guide column 21 is longer, which is larger than the diameter of the columnar output tooth 201 on the drive rod 200, so "stuck" or even stuck phenomenon occurs

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