Copier having superimposed and duplex copying capabilities and c

Details Copier having superimposed and duplex copying capabilities and c Copier having superimposed and duplex copying capabilities and c

1989-12-19

1991-07-23

Grimley, A. T.

Photocopying

Contact printing

Light boxes

271 3, 271902, 355206, 355316, G03G 2100

Patent

active

050347713

ABSTRACT:
A copier having superimposed copying and duplex copying capabilites and free from malfunctions ascribable to false jam detection which is caused by sensor errors. When a paper jam is detected due to the failure of a sensor, the copier determines whether or not a jamming paper sheet actually exists instead of immediately determining that a jam has occurred. If no jamming paper sheet exists, the copier does not perform any paper discharging movement by determining that the detection is caused by a sensor error and disables the superimposed copying and duplex copying functions.

REFERENCES:
patent: 4176941 (1979-12-01), Breitenkam et al.
patent: 4787616 (1988-11-01), Sasaki et al.
patent: 4812877 (1989-03-01), Nishimori et al.
patent: 4831411 (1989-05-01), Sugishima
patent: 4878087 (1989-10-01), Sakai et al.
patent: 4928150 (1990-05-01), Hatta

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