Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1979-03-22
1981-02-24
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 16, G03G 1500
Patent
active
042524326
ABSTRACT:
For control of an indirect electrophotographic copier employing an endless photoconductive belt having thereon at least one marking which excites a sensor each time the marking passes a fixed point in the belt path, the movement of the belt is measured electronically by a pulse generator coupled to a belt transport roller and a counter. Any difference between an electronically registered length of the belt and its actual length at a moment of sensor excitation is registered in a memory. At the end of a copying run pulses from the generator are diverted to the memory which then causes the difference to be corrected by discontinuation of the driving of the belt at an earlier or later moment.
REFERENCES:
patent: 3912390 (1975-10-01), van Herten
patent: 4082443 (1978-04-01), Draugelis et al.
patent: 4110033 (1978-08-01), Ophey
Braun Fred L.
Johnston Albert C.
Oce'-van der Grinten N.V.
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