Computer controlled electrostatic copying machine

Details Computer controlled electrostatic copying machine Computer controlled electrostatic copying machine

1978-10-10

1980-05-20

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3SH, G03G 1500

Patent

active

042036631

ABSTRACT:
An imaging optical system (34) scans an original document (58) and radiates a light image thereof onto a photoconductive drum (31) to form an electrostatic image which is developed to form a toner image. A first pulse generator (62) is driven synchronizingly by rotation of the drum (31) to produce first pulses. A second pulse generator which may include a clock pulse generator (19) for a microcomputer (12) used to control the operation of the copying machine (11) and a frequency divider (78) produces second pulses having a frequency typically ten times that of the first pulses. First and second counters (71), (79) count the first and second pulses respectively, the second counter (79) being reset by each of the first pulses. A sensor (83) senses a predetermined scan position of the optical system (34) and generates an electrical signal. A computer which may be embodied by the microcomputer (12) in response to the signal, stores first and second counts of the first and second counters (71 ), (79), adds a predetermined number to the first count to obtain a third count and actuates a copy sheet feed unit (44) to feed a copy sheet (37) into toner image transferring engagement with the drum (31) when the counts in the first and second counters (71), (79) simultaneously equal the third and second counts respectively, thereby producing accurate register of the toner image on the copy sheet (37).

REFERENCES:
patent: 3732005 (1973-05-01), Lloyd
patent: 4099860 (1978-07-01), Connin

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