Image forming apparatus including a paper feeding device having

Details Image forming apparatus including a paper feeding device having Image forming apparatus including a paper feeding device having

1993-08-13

1996-01-16

Grimley, A. T.

Photocopying

Contact printing

Light boxes

271259, 27126502, 355309, 355316, G03G 2100

Patent

active

054852471

ABSTRACT:
A paper feeding device is capable of judging that a paper jam occurs on the basis of output from a first paper detecting switch and a second paper detecting switch. These paper detecting switches are respectively provided ahead of and behind a registration roller which feeds paper sheets to an image forming section. If the first paper detecting switch is turned on when a predetermined time has elapsed since the registration roller started to feed a paper sheet to the image forming section, it is judged that a duplicate paper feeding state has occurred where a plurality of paper sheets are simultaneously fed. If the second paper detecting switch is turned off in the case where it is judged that a duplicate paper feeding state has occurred, it is judged that a paper jam has not occurred. The registration roller is stopped so it will later be ready to feed the subsequent paper sheet. Even when the paper sheets are simultaneously fed in a duplicate paper feeding state, it is not judged that a paper jam occurs as long as the paper sheets are fed one at a time to the image forming section. However, if both the first and second paper detecting switches remain on after the predetermined time, then it is judged that a paper jam has occurred.

REFERENCES:
patent: 4084900 (1978-04-01), Yamaoka et al.
patent: 4395111 (1983-07-01), Takahashi et al.
patent: 4937622 (1990-06-01), Makiura
patent: 5012281 (1991-04-01), Kusumoto et al.

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