Grounding device of sensitometric drum and sensitometric drum unit of image forming device

A technology of grounding device and photosensitive drum, which is applied in the direction of equipment, optics, and electrical recording technology using charge patterns, etc., and can solve the problems of reduced strength of the drum shaft 3, difficulty in forming images, and overflow of grease 8, etc. problem, to achieve the effect of preventing poor image formation, preventing abrasion, and preventing abrasion

Inactive Publication Date: 2008-11-19
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, if the small-diameter oil reservoir 7 is provided in the middle of the drum shaft 3, not only the strength of the drum shaft 3 will be reduced, but also the grease 8 may overflow from the oil reservoir 7 if the grease 8 is used repeatedly.
If the overflowed grease 8 adheres to the inner peripheral surface of the photosensitive drum 1, it will be difficult to form an image on this part, resulting in image failure.

Method used

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  • Grounding device of sensitometric drum and sensitometric drum unit of image forming device
  • Grounding device of sensitometric drum and sensitometric drum unit of image forming device
  • Grounding device of sensitometric drum and sensitometric drum unit of image forming device

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Embodiment Construction

[0039] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0040] first as figure 1 As shown in (a) and (b), the photosensitive drum unit 11 of the copier is fixed by fitting and fixing an insulating flange 13 (hereinafter simply referred to as a flange) made of synthetic resin at both ends of the photosensitive drum 12. The photosensitive drum 12 is coaxially arranged via the flange, and is rotatably mounted on a ground potential conductive drum shaft 15 that is erected non-rotatably relative to the frame 14 of the copier, and passes through the flanges on one or both sides. A gear 16 provided at 13 is rotatably connected to a rotational drive source.

[0041] The flange 13 is formed into a disc shape whose outer diameter is suitable for the inner diameter of the photosensitive drum 12. For the purpose of light weight and cost reduction, synthetic resin is used, and the gear 16 located on the outer end surface is integrally formed by...

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Abstract

The invention provides a grounding device of a photosensitive drum, which can avoid the noise of the connection portion of the drum shaft and the grounding component without reducing the intensity of the drum shaft to obtain a great image. The grounding device of the photosensitive drum is electrically connected to the drum shaft (15) with conductivity to the photosensitive drum (12) rotatablely installed on the drum shaft (15) via the grounding component (19); the conductive resin forms the grounding component (19); the grounding component (19) is provided with the contact sheet (19b) contacting to the photosensitive drum (12) on the grounding plate (19a), a flexible contact sheet (19c) contacting to the drum shaft (15); the drum shaft (15) and the photosensitive drum (12) are electrically connected.

Description

technical field [0001] The present invention relates to a grounding device electrically connecting a photosensitive drum in an electrophotographic device with a drum shaft as a ground potential, and a photosensitive drum unit of an image forming apparatus incorporating the grounding device. Background technique [0002] The photosensitive drums of electrophotographic devices such as copiers and laser printers are usually driven and supported by rotation, and flanges with gears are embedded in both ends or one side of the photosensitive drums, and are installed in the provisions of the image forming device. part. Recently, from the viewpoint of cost, electrically insulating synthetic resins such as polycarbonate (PC), polyacetal, and polyoxymethylene (POM) have been widely used as materials for the flange with gears. [0003] In the electrophotographic process, in order to obtain a good image, the photosensitive layer of the photosensitive drum must be grounded. In the past,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00G03G21/00
Inventor 赤尾尚彦冲芳郎国分竹男广濑和夫
Owner NTN CORP
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