Image forming with tilting register rollers to correct alignment

Details Image forming with tilting register rollers to correct alignment Image forming with tilting register rollers to correct alignment

1990-06-01

1991-07-23

Grimley, A. T.

Photocopying

Contact printing

Light boxes

100158R, 100164, 271228, 355271, G03G 2100

Patent

active

050347810

ABSTRACT:
In a copying machine inclucing paired register rollers which are driven after a front end of a paper supplied from a paper supply cassette comes in contact with the paired register rollers and is aligned and a copying unit for copying a document image on the paper fed by the paired register rollers, the paired register rollers are mounted on a frame via self-aligning bearings, two paper front detecting sensors are disposed on both sides of the center of a feeding path between the paired register rollers and the copying unit, the direction and angle of tilt of the paper held by the paired register rollers with respect to the feeding direction of the paper are detected based on a difference between timings at which the two sensors are turned on, and the paired register rollers are tilted in a direction opposite to the detected direction by the detected angle, thus correcting the tilt of the paper.

REFERENCES:
patent: 4095879 (1978-06-01), Katayama et al.
patent: 4772913 (1988-09-01), Watanabe

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