Duplex document copying

Details Duplex document copying Duplex document copying

1977-06-14

1978-09-05

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Copying both sides of original

355 51, 355 76, 355 77, G03B 2732, G03B 2752

Patent

active

041115473

ABSTRACT:
A web/scroll duplex document handling system for a copier which provides document recirculation for pre-collation copying of both sides of the documents. The document is positively retained at all times by positive engagement by a document supporting web. A document is unobstructedly imaged on one side on one web, then transferred to another web while the two webs both engage the document without relative movement, and then the other side of the document is unobstructedly imaged on the other web. The two webs may be separately wound on four scrolls or a three scroll system may be provided in which one end of both webs is commonly wound on a single scroll. A set of documents are selectively wound and unwound between respective scrolls and transferred between webs to automatically provide duplex copying.

REFERENCES:
patent: 3079839 (1963-03-01), Lohner et al.
patent: 3936171 (1976-02-01), Brooke
patent: 3981580 (1976-09-01), Yamashita

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