JP2745114B2 - Photoreceptor drum for electrophotography - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive drum for electrophotography such as a copying machine, a printer, and a facsimile.

[0002]

2. Description of the Related Art In a photosensitive drum for electrophotography, a toner cleaning operation for scraping off toner remaining on the drum surface without being completely transferred onto a sheet through a cleaning blade is always performed. However, due to variations in the hardness, friction coefficient, contact angle, pressure force, and roundness and eccentricity of the photosensitive drum, the cleaning blade jumps without smooth sliding on the photosensitive drum surface. The occurrence of chattering often causes a problem such that the photosensitive drum resonates and emits an unpleasant sound, causing a so-called cleaning blade squeal. However, as a countermeasure against such a problem, a vibration suppressing material made of a small piece of lead or the like is attached to the inner peripheral surface of the photosensitive drum via an adhesive tape so as to absorb resonance (Japanese Unexamined Patent Publication No. Hei 3-459).
No. 81) is known.

Meanwhile, the vibration suppressing material which should absorb resonance has a wide range of elasticity as a condition for preventing the propagation of vibration, similarly to a vibration isolating material used in general equipment, and has a wide range of load and vibration. It is necessary to have sufficient strength and durability to support a vibration source without causing permanent set. For this reason, it is desirable that the vibration suppressing material provided inside or on the inner surface of the photosensitive drum is not a small piece or the like, but a hard elastic material that is pressed against the inner surface of the drum with as large a surface as possible. Also, the means for fixing the vibration suppressing material to the inner surface of the drum requires time and effort for mounting, and unlike bonding with an adhesive which may be peeled off after mounting, it is surely secured by the pressing force of the vibration suppressing material itself. It is preferred that the form be retained.

[0004]

SUMMARY OF THE INVENTION The present invention satisfies the above-mentioned requirements of the prior art, eliminates chattering of the cleaning blade, and has an effective vibration suppressing action without lowering workability. Another object of the present invention is to provide a simple photosensitive drum for electrophotography.

[0005]

According to the present invention, first, in a photosensitive drum for electrophotography having a photoconductive layer on an outer peripheral surface of a cylindrical support, a sheet-like vibration suppressing material is provided on an inner surface of the cylinder. Is provided by a pressing force of a pressing member such as a spring. Secondly, there is provided an electrophotographic photosensitive drum according to the first electrophotographic photosensitive drum, wherein the spring member is a bullet.

[0006]

An embodiment of the present invention will be described with reference to the drawings. In the embodiment shown in FIG. 1, the vibration suppressing material 11 in the photosensitive drum 12 is formed by pressing a single sheet-like material 11a having an appropriate elasticity which has been previously rounded into a cylindrical shape via a pressing member 13 such as a spring. It is formed by expanding and fixing to the inner surface of the drum 12. 2 (A), 2 (B) and 2 (C) show an example of the formation order. First, one metal or plastic bullet 13a is wound around a round bar jig, and both ends of the bullet are round bar jigs. To the coil spring-shaped pressing member (13).
a) (FIG. 2 (A)), and one sheet-like material 11a is wound around the outside thereof (FIG. 2 (B)). Both ends of 13a are separated from the round bar-shaped jig to form a pressing member 13, and the sheet-shaped material 11a is pressed against the inner surface of the aluminum tube 12 via the spring (FIG. 2C). Next, the jig is removed to form the photosensitive drums 12. The sheet-like material 11a used in this case was Hama Damper (trade name, manufactured by Yokohama Rubber Co., Ltd.).

[0007]

According to the photographic photosensitive drum of the present invention, since the spring is used for expanding and fixing the sheet-shaped vibration suppressing material, the fixing and holding can be performed quickly and easily. As a result, the chattering noise of the cleaning blade was eliminated, and the contamination of the horizontal tier of the image due to poor cleaning was eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sheet-shaped resin material fixed in a photosensitive drum by a spring force to form a vibrating resin material.

FIGS. 2A, 2B, and 2C are explanatory diagrams showing the order of formation.

[Explanation of symbols]

 11: vibration suppression material 12: photosensitive drum 13: pressing member by spring

Continuation of the front page (56) References JP-A-63-60480 (JP, A) JP-A-64-7089 (JP, A) JP-A-5-188838 (JP, A) JP-A-63-271388 (JP, A) JP-A-2-118684 (JP, A) JP-A-3-44689 (JP, A) JP-A-3-455981 (JP, A) JP-A-5-35166 (JP, A) 5-34936 (JP, A) Japanese Utility Model 62-127567 (JP, U) Japanese Utility Model 1-146264 (JP, U) Japanese Utility Model 1-146265 (JP, U)

Claims (2)

(57) [Claims] 1. A photosensitive drum for electrophotography having a photoconductive layer on an outer peripheral surface of a cylindrical support, wherein a sheet-like vibration suppressing material is spread and fixed on the inner surface of the cylinder by a pressing force of a pressing member such as a spring. A photosensitive drum for electrophotography. 2. The electrophotographic photosensitive drum according to claim 1, wherein the spring member is a bullet.