JPH0573663U - Electrophotographic photoreceptor - Google Patents

Abstract

(57) [Abstract] [Purpose] When a photosensitive member provided with a photosensitive layer on a metal foil support is driven by a roller, a stopper is provided on the back surface of the support to prevent the support from being axially offset on the roller. In electrophotographic photoreceptors with guides, prevent the support from cracking. [Structure] The bending stress of the support when the photoconductor is rotated by the drive system is set by using the taper guides at the both ends of the guides as taper guides or seamless guides. Ease the concentration of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an anti-slip guide for an electrophotographic photosensitive member having a seamless flexible metal foil as a support, which is used in a copying machine, a printer, a facsimile, and the like.

[0002]

[Prior Art]

 A metal foil support is provided with a photoconductor. When a photoconductor is driven by a roller, a guide is provided on the back surface of the support to prevent the support from being axially offset on the roller. Regarding electrophotographic photoconductors, Utility Model No. 1-135465 and Japanese Patent Laid-Open No. 62-050873 have been proposed, but when a photoconductor roller provided with such a detent guide is driven, the support at the abutting portion is supported. As a result of repeated bending stress, cracks occur in the support. Repeated bending stress is applied to the entire circumference of the photoconductor, but the bending stress is likely to concentrate on the support part at the abutting part.

In a conventional butt-type detent guide, a band-shaped rubber is adhered to the inner surface of the metal foil with a double-sided tape, but since the rubber is not overlapped and stretched, a gap remains in the mating portion and the support Since stress concentration occurs in this part of the base, cracks occurred in the support due to fatigue due to repeated stress concentration.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to solve the crack of the metal foil of the support due to the repeated use of the electrophotographic photosensitive member having the abutting type detent on the back side of the support as described above.

[0005]

[Means for Solving the Problems]

 According to the present invention, when a roller having a photosensitive layer provided on a metal foil support is driven by a roller, a guide is provided on the back surface of the support to prevent the support from being axially offset on the roller. In this electrophotographic photosensitive member, the problem that the metal foil is cracked by repeated use was solved by forming both end butting portions of the offset prevention guide into a tapered shape.

In addition, the problem has been solved by forming the offset prevention guide into a seamless ring shape and eliminating the abutting portion.

FIG. 1 is a side view of a photosensitive member having a photosensitive layer 1 provided on the surface of a metal foil 2, which is used as a guide for preventing the deviation from the back side of the metal foil 2. The configuration provided with the guide 3 is shown. FIG. 2 shows an enlarged view of the abutting portion of the present invention in which both tips are tapered. FIG. 3 shows an enlarged view of a conventional anti-stop guide butt portion. The taper angle θ is suitably 45 ° ± 20 °, and the joining width t is preferably 0 to 2 mm. FIG. 4 shows a driving system of a photoconductor in which a photoconductive layer is provided on a metal foil support.

In the configuration example of FIG. 3, stress concentration is exerted on the metal foil at the abutting portion where the metal foil and the detent guide are adhered. Therefore, the photoconductor is repeatedly driven by the drive system 0 having the configuration as shown in FIG. When it was driven, the metal foil was driven 15,000 times, and a crack occurred at the butted portion. In the configuration example of FIG. 2, the structure was driven 2 million times, but no cracking occurred.

In the present invention, instead of the stopper guides for the abutting portions whose both ends are tapered, a seamless stopper guide may be used. As a result of eliminating the abutting portion by using this seamless anti-stop guide, it was driven for 2 million times, but no cracks occurred.

[0010]

[Effect of the device]

 When a roller with a photosensitive layer provided on a metal foil support is driven by a roller, in order to prevent the support from being offset in the axial direction on the roller, a guide is provided on the back surface of the support to prevent it from slipping. By using a taper-shaped stopper guide or a seamless stopper guide at both ends of the stopper guide, the bending stress of the support is smoothed when rotated by the drive system. Therefore, stress concentration on the metal foil does not occur. As a result, durability against repeated rotation is improved.

[Brief description of drawings]

FIG. 1 is a view showing a structure in which an offset prevention guide in which both tip ends of the offset prevention guide of the present invention are tapered butted is provided.

FIG. 2 is an enlarged view of an abutting portion in which both ends of the anti-stop guide of the present invention are tapered.

FIG. 3 is an enlarged view of a conventional anti-stop guide butt portion.

FIG. 4 shows a driving system of a photoconductor in which a photoconductive layer is provided on a metal foil support.

[Explanation of symbols]

 1 Photosensitive Layer 2 Metal Foil 3 Offset Guide 4 Drive Roller 5 Tension Roller 6 Driven Roller 7 Photoreceptor 8 Tapered Butt at Both Ends

Claims (2)

[Scope of utility model registration request] 1. When a photosensitive member having a photosensitive layer provided on a metal foil support is driven by a roller, an offset guide is provided on the back surface of the support in order to prevent the support from being axially offset on the roller. The electrophotographic photosensitive member according to claim 1, wherein both end butting portions of the detent guide are tapered. 2. A detent guide is provided on the back surface of the support in order to prevent the support from being axially offset on the roller when the photoconductor having the photoconductor provided on the metal foil support is driven by a roller. The provided electrophotographic photosensitive member is characterized in that the detent guide has a seamless shape.