Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1977-01-21
1978-08-29
Pellinen, A. D.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 16, G03G 2100
Patent
active
041100336
ABSTRACT:
An electrophotographic copying apparatus employing a moving endless photoconductive belt for image formation and image transfer is provided with a control system whereby images are formed on the belt at fixed locations relative to at least one marking on the belt, without need to make the belt precisely to a certain length or to provide more than a single marking which, if the belt is made endless by a seam, can be located near the seam to enable skipping of the seam in the imaging operations. The control system includes a detector for emitting a signal pulse upon being passed by a marking and two substantially identical partial circuits, each operable to emit control signals for activating or inactivating processing stations that together form a processing zone traversed by the belt, and a switching circuit for starting the operation of one of the partial circuits in response to the signal pulse while the other partial circuit is and continues operating to complete the processing of the last imaging belt portion that entered the processing zone before the emission of the signal pulse.
REFERENCES:
patent: 3912390 (1975-10-01), van Herten
Johnston Albert C.
Oce'-van der Grinten N.V.
Pellinen A. D.
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