Photosensing drum and image forming device

Abstract

An image forming device which detachably constitutes a photoreceptor drum and a developing device. The photosensitive drum has a drum with a photosensitive layer on its outer periphery and a rear drum flange. Wherein, the coupling part for making the photoreceptor drum detachable from the main body of the image forming device has an input part and a device output part. The input unit is composed of an internal gear formed on the inner circumference of the flange portion of the rear side drum with an involute tooth profile, and receives rotational driving force from the main body of the image forming apparatus. The device output unit is formed in the main body of the image forming device. The device output unit is composed of an external gear having the same tooth shape and number of teeth as the internal gear, and outputs rotational driving force from the main body of the image forming device to the input unit.

Description

technical field [0001] The present invention relates to an electrophotographic image forming apparatus used in a copying machine, a printer, a facsimile, and the like, and a photoreceptor drum used in the image forming apparatus. Background technique [0002] Conventionally, in electrophotographic image forming apparatuses such as copiers, printers, and facsimile machines, a toner image is formed by developing a latent image formed on an image carrier (photoreceptor), and the formed toner image is reproduced. On the paper conveyed by the conveying device, after that, an image is formed on the paper by sizing. As the image carrier, a cylindrical photoreceptor drum having a photosensitive coating film formed on the outer peripheral surface is generally used. [0003] In order to form good images using such a photoreceptor drum, it is necessary to periodically replace the photoreceptor drum. Therefore, in order to facilitate attachment and detachmen...

AI Technical Summary

Problems solved by technology

[0007] However, in the structure described in JP-A-64-21466, even if the driving part side and the photoreceptor drum side are manufactured with high precision, it is impossible to completely eliminate the eccentricity error and the mutual axis deviation during meshing, etc. Eccentricity or shaft misalignment will occur anyway

In this state, when there is no loose connection, an excessive force is applied to the connection part, and instead the meshing state becomes unstable and a force acts, causing a problem that smooth rotation cannot be obtained.

In addition, since the tapers are provided at the connecting parts, the force of moving the photosensitive drum in the axial direction also acts, and there is also a problem that the periodic position deviation in the axial direction of the photosensitive drum is likely to occur.

[0008] In addition, in the structure described in Japanese Patent No. 3078464, the drive gear on the main body side of the image forming apparatus has to form a single arm structure.

Therefore, the axis base of the external gear and the internal gear varies due to load fluctuations during drive transmission, and stable rotation of the photosensitive drum cannot be obtained.

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