Exposure device for copying apparatus

Details Exposure device for copying apparatus Exposure device for copying apparatus

1989-06-01

1991-05-21

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355233, G03G 2100

Patent

active

050179713

ABSTRACT:
An exposure control device for use in a copying apparatus capable of performing two kinds of exposure modes wherein the first mode is a stationary exposure mode in which information on a document is read out by moving an optical scanner while the document is kept stationary, and the second mode is a synchronized exposure mode in which information on a document is read out by moving the document in synchronization with the movement of a photoreceptor while the optical scanner is kept stationary. When the number of sets of copies is a single set, the synchronized exposure mode is automatically selected regardless of the input result of a mode key which manually sets the exposure mode. The apparatus comprises a document feeder and a double feed prevention device operating by means of a sheet sensor for feeding a following sheet only when passage of a preceding sheet is detected.

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