Overlapped feed detecting device

Details Overlapped feed detecting device Overlapped feed detecting device

1998-06-30

2000-08-22

Ellis, Christopher P.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

27125801, 271262, 271256, B65H 712

Patent

active

061059595

ABSTRACT:
Overlapped paper feed can be detected easily and promptly. Along a paper feeding path, a light emitting element 1 and a light receiving sensor 2 are placed face to face and a detection signal corresponding to the light transmissivity of paper is output. The detection signal is not amplified by one system and amplified at a predetermined amplification ratio via an amplifying circuit 3 in the other system. An A/D converter 5a or 5b is set in each system and outputs the detection signal to a CPU 6 after sampling the detection signal. The CPU 6 detects overlapped feed by selecting the system whose detection signal value is within the effective range which is not effected by noise and not at a saturation level.

REFERENCES:
patent: 3578315 (1971-05-01), Milford
patent: 4160546 (1979-07-01), McMillan et al.
patent: 4652742 (1987-03-01), Wauer et al.
patent: 5067704 (1991-11-01), Tsuihiji et al.
patent: 5105078 (1992-04-01), Nochise et al.
European Search Report.

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