Photocopying – Projection printing and copying cameras – Copying both sides of original
Patent
1978-01-26
1979-11-06
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Copying both sides of original
271 69, 355 3SH, G03B 2732, G03B 1500, B65H 2968
Patent
active
041734106
ABSTRACT:
In the method, two originals are placed side-by-side on the contact glass of an electrophotographic duplex copying machine and are scanned successively, in a single scanning operation, by the exposure optical system of the machine to form respective successive images on a photoconductive drum rotated past an image transfer device. Two transfer sheets are fed successively, with a short interval therebetween, from a primary supply device for transfer sheets, past the image transfer device in synchronism with the image formation on the drum, to provide duplex copies, having images in the same relation as that of the two originals, in a single copying cycle or process. By utilizing a secondary sheet supply device and a suitable switching device, images can be provided on both sides or surfaces of a transfer sheet or sheets. The duplex copying apparatus includes a novel sheet feed device effective to stack transfer sheets neatly.
REFERENCES:
patent: 1452996 (1923-04-01), Baker
patent: 3603680 (1971-09-01), Barton
patent: 3768382 (1973-10-01), Zernov et al.
patent: 4017173 (1977-04-01), Komori et al.
Kaneko Tamaki
Koizumi Yutaka
Nakamura Isao
Satomi Toyokazu
Tabata Yasuhiro
Griffin Donald A.
Ricoh & Company, Ltd.
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