Electrophotographic copying machine

Details Electrophotographic copying machine Electrophotographic copying machine

1986-12-24

1988-11-15

Salce, Patrick R.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14E, 355 67, 355 69, G03G 1500

Patent

active

047853280

ABSTRACT:
An electrophotographic copying machine has a flash lamp for applying a flash of light to a document to be copied. The copying machine also includes a sensor for detecting whether the flash lamp is energized or not. When there is no signal indicating that the flash lamp is energized even in the presence of a command to energize the flash lamp, a control circuit determines that the flash lamp has failed to emit light at a predetermined exposure timing, and produces an output signal to effect a predetermined operation upon non-energization of the flash lamp. An arrangement for effecting such a predetermined operation may for example be a switch of an erase lamp, a control circuit for controlling operation of a copy counter, a switch of a motor for driving image developing rollers, a control circuit for controlling a developing bias, a switch of an image transfer charger, a control circuit for controlling a separator finger for changing feed paths of travel of an image transfer sheet, a control circuit for controlling a shutter to cover an image transfer charger, or a switch for driving rollers which feed an image transfer sheet.

REFERENCES:
patent: 3679306 (1972-07-01), DuBois et al.
patent: 4095890 (1978-06-01), Van Herten
patent: 4235550 (1980-11-01), Case

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