Device for preventing breakdown of contact charger for use in el

Details Device for preventing breakdown of contact charger for use in el Device for preventing breakdown of contact charger for use in el

1994-04-14

1995-11-28

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355207, 355211, 355219, 355271, G03G 2100

Patent

active

054712831

ABSTRACT:
An electrophotographic printing machine is provided with a photoreceptor drum including a photosensitive layer formed on a surface of an electrically conductive base, a contact charger in contact with the photosensitive layer for charging the photosensitive layer by applying thereto a DC voltage, and a voltage drop detecting circuit for outputting a detecting signal when the voltage has dropped below a reference voltage. When a defect exists such as a pin hole on the photosensitive layer, the voltage being applied to the photosensitive layer of the contact charger drops. In this state, a detecting signal is output to a controller from the voltage drop detecting circuit. When the controller receives the detecting signal, the controller signals to stop the operation of the entire device, and signals a display to display a message indicating to exchange the photoreceptor drum. According to the electrophotographic printing machine, the image forming process will not be continued with the detective portion on the photosensitive layer. Thus, the contact charger can be prevented from breaking down.

REFERENCES:
patent: 4777554 (1988-10-01), Gokita
patent: 4890125 (1989-12-01), Egawa et al.
patent: 5012279 (1991-04-01), Nakajima et al.
patent: 5138380 (1992-08-01), Umeda et al.
patent: 5144368 (1992-09-01), Ohzeki et al.
patent: 5313359 (1994-05-01), Imagawa et al.

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