Distortion checking device in an electrophotographic copying app

Details Distortion checking device in an electrophotographic copying app Distortion checking device in an electrophotographic copying app

1990-01-10

1991-07-09

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355204, 355208, 355218, G03G 2100

Patent

active

050309897

ABSTRACT:
An electrophotographic copying apparatus including by a blank lamp lighting control for lighting only predetermined ones of emitters forming a blank lamp during the operation of image forming apparatus in a check mode. If copying is carried out in the check mode, some stripes are drawn on copied images in parallel with the direction of movement of a photoreceptor by lighting of a predetermined number of the emitters. Further, the aforementioned blank lamp is constructed to light all the emitters simultaneously for a short time, so that stripes are drawn on the copied images perpendicular to the direction of movement of the photoreceptor. Depending on the parallelism of the stripes with the sides of a copying paper, it can be determined whether the distortion in the copied images is caused by the optical system or by the copying paper conveying mechanism.

REFERENCES:
patent: 4697916 (1987-10-01), Komiya et al.
patent: 4708464 (1987-11-01), Otsuki et al.
patent: 4743944 (1988-05-01), Tomosada et al.
patent: 4831420 (1989-05-01), Walsh et al.
patent: 4851878 (1989-07-01), Sumida

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