Browse Prior Art Database

HYBRID OPTICAL/ELECTRONIC DUPLEX COPYING WITH A FIXED DUPLEX LOOP LENGTH

IP.com Disclosure Number: IPCOM000024945D
Original Publication Date: 1983-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 98K

Publishing Venue

Xerox Disclosure Journal

Abstract

The printing of duplex (two-sided) copies with electronic imaging on the photo-receptor of the original document "pages" is utilized in the Xerox Corporation "9700" printer, "813" Duplex Option version. With this system the copier prints odd pages sequentially, then prints even pages sequentially on the back of those odd pages which have been recirculated back to the photoreceptor, and repeats this process until the entire copy set is completed. 'With this system the copy sheets being duplexed need not be fed to and from, or temporarily stored in, a dedicated duplex tray or buffer set, rather they are moved in a short continuous transport path providing a moving loop of the sheets being duplexed. The electronic input allows the "pages" of the original document to be electronically reordered and laser-printed on the photoreceptor in a rearranged page order for producing precollated duplex copy sets. Also noted is Xerox U.S. Patent No. 4,035,073 to George Del Vecchio.

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The printing of duplex (two-sided) copies with electronic imaging on the photo- receptor of the original document "pages" is utilized in the Xerox Corporation "9700" printer, "813" Duplex Option version. With this system the copier prints odd pages sequentially, then prints even pages sequentially on the back of those odd pages which have been recirculated back to the photoreceptor, and repeats this process until the entire copy set is completed. 'With this system the copy sheets being duplexed need not be fed to and from, or temporarily stored in, a dedicated duplex tray or buffer set, rather they are moved in a short continuous transport path providing a moving loop of the sheets being duplexed. The electronic input allows the "pages" of the original document to be electronically reordered and laser-printed on the photoreceptor in a rearranged page order for producing precollated duplex copy sets. Also noted is Xerox U.S. Patent No. 4,035,073 to George Del Vecchio.

Proposed here is a hybrid architecture combining standard light lens direct optical copying of actual document sheets with electronic printout from electronic memory of the even page sides, in the proper sequence or interleaving with the optical page copies to produce the desired precollated duplex printout, and using such a partial buffer loop system. This may reduce the electronic memory requirements compared to an all electronic system. Thus, for example, one side of a duplex document may be optically imaged on the photoreceptor while the other side of that same document (assuming a duplex document) is being read by an electronic document reader and stored in electronic memory for subsequent imaging on the same photoreceptor to produce a duplex copy of that duplex docume...