Browse Prior Art Database

MISFEED RECOVERY SYSTEM

IP.com Disclosure Number: IPCOM000027166D
Original Publication Date: 1995-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 128K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a monitoring and control system which stops a photoreceptor and developer system whenever a receiver sheet feed problem makes it clear that the photoreceptor image will reach a transfer zone before the receiver sheet. A feed algorithm is then restarted to give the receiver sheet a second chance, which, if restarts, the photoreceptor and developer system.

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XEROX DISCLOSURE JOURNAL

MISFEED RECOVERY SYSTEM

Michael J. Martin Kathleen M. Laffey Russell J. Sokac Lloyd W. Durfey Gerald M. Garavuso Robert P. Siege1 Steven R. Moore

Proposed Classification
U.S. C1.355/014 Int. Cl. G30g 21/00

Disclosed is a monitoring and control system which stops a photoreceptor and developer system whenever a receiver sheet feed problem makes it clear that the photoreceptor image will reach a transfer zone before the receiver sheet. A feed algorithm is then restarted to give the receiver sheet a second chance, which, if restarts, the photoreceptor and developer system.

Misacquisition of a receiver sheet is monitored by a sensor in top vacuum corrugation feeders (TVCF). If the sensor does sense acquisition of the sheet within a specified period of time, a machine controller uses a misacquire routine to assure sheet acquisition by sheet feed belts. As the misacquire routine is doing the job of placing a sheet against the feed belts, elapse time is being monitored. If the controller determines that the image on the belt is going to reach transfer before the sheet, a misfeed routine is activated. The photoreceptor belt and the developer must be stopped. The controller checks to see if the paper has been acquired by a vacuum plenum. If acquisition has not taken place, the feed algorithm is started once again to give the sheet a second chance. If the sheet is acquired or if the second chance feed is successful, then the sheet is fed on into the system. Once registration has occurred, the controller starts photoreceptor and developer motion to synchronize arrival of the image and the paper. Normal system control is now operational until another failure is encountered.

Also disclosed is a sheet feeding system and method which comprises an apparatus for feeding sheets in seriatum, or in series, from a stack, including means for supporting the stack, the supporting means including a sheet feeding end, conveying means having a portion disposed proximate to the sheet feeding end for individually transporting sheets out of the supporting means, vacuum means for exerting a first negative pressure on the stack to draw a sheet to proximate the sheet fe...