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HIGHER PRODUCTIVITY SYSTEM FOR TWO-SHEET DOCUMENT SETS

IP.com Disclosure Number: IPCOM000025717D
Original Publication Date: 1987-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 77K

Publishing Venue

Xerox Disclosure Journal

Abstract

It is known that a copier with a recirculating document handler providing precollation copying loses productivity when there are only two document sheets being recirculated, i.e. a 2-sheet document set. The productivity problem with two document sheets in an RDH is that to avoid skipping pitches (copying time periods) each document sheet must start from its registered copying position on the platen and traverse or circulate through the entire RDH paper path, back to its starting position on the platen, in one copy time, allowing for all of the time periods required for the restacking, settling and reacquisition by the feeder in the document tray. When the recirculating document handler is associated with a large, e. g. A3 size platen, this document recirculating path length is on the order of 50 inches or greater, which for a 90 copy per minute copying rate would require transport speeds in excess of 70 inches per second. By way of background, and other solutions, see U. S. Patent 4,468,114 issued August. 28,1984 to Susan J. Pels, et a1 and U. S. Patent No. 4,568,172 issued February. 4,1986 to Thomas Acquaviva.

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XEROX DISCLOSURE JOURNAL

HIGHER PRODUCTIVITY SYSTEM Proposed Classification FOR TWO-SHEET DOCUMENT SETS
Morton Silverberg

U.S. C1.355/15SH Int. C1. G03g 21/00

It is known that a copier with a recirculating document handler providing precollation copying loses productivity when there are only two document sheets being recirculated, i.e. a 2-sheet document set. The productivity problem with two document sheets in an RDH is that to avoid skipping pitches (copying time periods) each document sheet must start from its registered copying position on the platen and traverse or circulate through the entire RDH paper path, back to its starting position on the platen, in one copy time, allowing for all of the time periods required for the restacking, settling and reacquisition by the feeder in the document tray. When the recirculating document handler is associated with a large, e. g. A3 size platen, this document recirculating path length is on the order of 50 inches or greater, which for a 90 copy per minute copying rate would require transport speeds in excess of 70 inches per second. By way of background, and other solutions, see
U. S. Patent 4,468,114 issued August. 28,1984 to Susan J. Pels, et a1 and U. S. Patent No. 4,568,172 issued February. 4,1986 to Thomas Acquaviva.

In the system here, in each circulation, two copies are made of each of the two original sheets, with the second copy going to a special, extra, holding tray. That copy sheet is then fed to the norma...