Printing apparatus

Details Printing apparatus Printing apparatus

1998-03-12

2000-04-11

Moses, Richard

Electrophotography

Image formation

Transfer

399299, 399306, G03G 1514

Patent

active

060496908

ABSTRACT:
A drum phase correction unit for detecting rotational positions of a plurality of photosensitive drums by means of a plurality of drum position sensors and corrects to set rotational phases of the drums to predetermined phases in such a manner that transfer positions on drum circumferential surfaces relative to a belt when employing the thus detected rotational positions as their respective references have a specific relationship including coincidence. A positional offset detection unit detects positional offsets of transfer image on recording paper attributable to the wow and flutter in a drive system including the belt and the photosensitive drums. On the basis of the thus detected positional offsets, a wow and flutter correction unit corrects the positional offsets of the transfer images on the recording paper attributable to the wow and flutter.

REFERENCES:
patent: 4752804 (1988-06-01), Ohno
patent: 4796050 (1989-01-01), Furuta et al.
patent: 5243396 (1993-09-01), Castelli et al.

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