Electrophotography – Diagnostics – Document handling
Patent
1995-12-08
1998-01-13
Royer, William J.
Electrophotography
Diagnostics
Document handling
399381, G03G 1500
Patent
active
057089108
ABSTRACT:
A jam detecting device according to the present invention quickly outputs a jam detection signal when a part of a sheet is insufficiently conveyed during conveyance. A discharge detecting switch 55 is provided in the vicinity of discharge rollers 36. In addition, a plurality of (for example, three) pulse output units 230, 231 and 232 are provided in relation to the discharge detecting switch 55. Each of the pulse output units 230, 231 and 232 is so constructed as to output a pulse as the sheet is moved. In a jam judging circuit 235, when a signal of the discharge detecting switch 55 is on, a jam signal is outputted on the basis of the fact that no pulses are applied for not less than a predetermined time period from at least one of the pulse output units 230, 231 and 232. When a Jam occurs, therefore, the jam can be quickly detected. Consequently, the jam can be detected before a large sheet is crumpled or is tangled with a delivery roller in an image forming apparatus, whereby measures against the jam is easily taken.
REFERENCES:
patent: Re34685 (1994-08-01), Negishi et al.
patent: 3917142 (1975-11-01), Guarderas
patent: 4249080 (1981-02-01), Pritchett et al.
patent: 4804998 (1989-02-01), Miyazaki
patent: 5204726 (1993-04-01), Choi
patent: 5237378 (1993-08-01), McEwen
Patent Abstracts of Japan for Publication No. JP57107351.
Patent Abstracts of Japan for Appln. No. 60-143362.
Fukano Masahiko
Ishii Kunihiko
Grainger Quana
Mita Industrial Co. Ltd.
Royer William J.
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