Electronic alignment for a paper processing machine

Details Electronic alignment for a paper processing machine Electronic alignment for a paper processing machine

1982-12-22

1985-04-16

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3R, 355 3SH, 355 14R, 355 14SH, 271227, 198394, B65H 920, B65H 900, G03B 2700, G03G 1500

Patent

active

045112428

ABSTRACT:
Electronic alignment of paper feeding components in a machine such as an electrophotographic copier machine is achieved by placing an original master containing vernier calibrations on the document glass and a target master containing vernier calibrations in the copy paper bin. Thereupon, the machine is operated to produce a copy of the original master onto the target master producing a double set of vernier calibrations on the target master, which, when compared, provides information relating to skew angle, side edge relationship and leading edge alignment of the image to the copy paper. The vernier calibrations provide data which are keyed into a microprocessor controlled copy feeding servo mechanism to correct copy paper position and remove misalignment. The operation is repeated for various combinations of paper feed paths with techniques of original document placement and for duplex operation so that the copy paper matches image position for all modes of copier operation. For printer mode of operation, the master vernier is printed to produce the needed image.
In addition, sensors are located in the copy paper path to automatically correct for deviations in the copy sheet feeding unit, caused by wear, for example, over a period of time.
Sensors are also located in the document feeder so that corrections in the position of the copy paper may be made on an individualized and dynamic basis to electronically correct for misalignment of individual originals on the document glass.

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