Electrophotographic copying apparatus with monitoring of scannin

Details Electrophotographic copying apparatus with monitoring of scannin Electrophotographic copying apparatus with monitoring of scannin

1988-11-21

1990-08-28

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

255235, G03G 1500

Patent

active

049529854

ABSTRACT:
An electrophotographic copying apparatus in which a speed of scanning system is detected and when the detected speed exceeds a predetermined range till paper feed means feeds a paper to a photosensitive drum after the scanning system starts its operation, the paper is stopped just before the photosensitive drum to repeat scanning again, thereby transient speed fluctuation causes are eliminated and the copying operation is recovered automatically to prevent a poor image forming, and further, the number of the try to scan is counted and, when it exceeds a predetermined number, the paper is discharged as it is in blank to save trouble of removing the paper, and also driving torque of the scanning system is detected to warn when it exceeds a predetermined range and thereby warn the user's overload on an original table to prevent a poor image forming.

REFERENCES:
patent: 4561764 (1985-12-01), Sugiura
patent: 4561771 (1985-12-01), Sugiura
patent: 4568171 (1986-02-01), Ikenoue
patent: 4819025 (1989-04-01), Takahaski et al.

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