Multiple servo system for compensation of document mis-registrat

Details Multiple servo system for compensation of document mis-registrat Multiple servo system for compensation of document mis-registrat

1989-11-17

1992-02-04

Grimley, A. T.

Photocopying

Contact printing

Light boxes

271265, 355321, G03G 2100

Patent

active

050863193

ABSTRACT:
The present invention is a system for positioning an original document near a target registration point on an imaging platen of a xerographic reproduction system, including the capability to compensate for any resulting mis-registration of the document. The amount of mis-registration of the original document, in the feed direction, is determined by a servo encoder or positional sensing mechanism and passed to the control function of a subsequent servo-mechanical system. The subsequent servo-mechanical system controls the positional alignment of the copy paper with respect to the laten image present on the photoreceptor. This system automatically adjusts the nominal feed velocity of the copy paper to correct for the previously determined mis-registration of the latent image on the photoconductive surface. This, the positional error introduced by the document feeding system is removed at a subsequent subsystem within the xerographic system.

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