Browse Prior Art Database

STUTTER-START FUSING

IP.com Disclosure Number: IPCOM000026371D
Original Publication Date: 1991-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 77K

Publishing Venue

Xerox Disclosure Journal

Abstract

A stutter-start fusing system that enhances paper handling reliability for use in electrophotographic printing and copying machines is disclosed. A high concentration of unfused toner on the lead edge of a copy sheet may cause a misstrip jam to occur in a fuser assembly. A misstrip jam occurs because the leading edge of the copy sheet is not completely stripped off of the fuser roll thereby jamming the paper path or the copy sheet becomes wrapped around the fuser roll. To minimize jam frequencies and enhance paper handling reliability, fuser misstrip may be avoided by a "start-stop-start" or stutter-start fusing algorithm and sequence that comprises: detecting a copy sheet leading edge bearing toner using an appropriate optical sensor; partially fusing the copy sheet at the leading edge in the fuser nip; reversing the fuser roll drive to back the partially fused copy sheet out of the fuser nip region; stripping the partially fused copy sheet from the fuser roll by prefuser stripper fingers; advancing the fuser drive and the copy sheet in the forward process direction to completely fuse the copy sheet; and stripping the completely fused copy sheet from the fuser roll by post fuser stripper fingers. A sensor capable of detecting heavily toned lead edges of copy sheets is positioned in a post development area. System software samples the sensor signals and watches for the appearance of heavily toner lead edges of copy sheets. When a heavily toned lead edge copy sheet is detected, the stutter-start fusing algorithm and sequence are invoked. The stutter-start fusing system effectively prevents fuser misstrip jams, reduces user-operator intervention with the operation of the fusing subsystem, and reduces the frequency of complete stoppage of paper handling subsystems.

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XEROX DISCLOSURE JOURNAL

STUTTE R-START FUSING Michael J. Martin
Steven R. Moore
Russell J. Sokac

Proposed Classification
U.S. C1.355/290 Int. C1. G03g 15/20

A stutter-start fusing system that enhances paper handling reliability for use in electrophotographic printing and copying machines is disclosed.

A high concentration of unfused toner on the lead edge of a copy sheet may cause a misstrip jam to occur in a fuser assembly. A misstrip jam occurs because the leading edge of the copy sheet is not completely stripped off of the fuser roll thereby jamming the paper path or the copy sheet becomes wrapped around the fuser roll. To minimize jam frequencies and enhance paper handling reliability, fuser misstrip may be avoided by a "start-stop-start" or stutter-start fusing algorithm and sequence that comprises: detecting a copy sheet leading edge bearing toner using an appropriate optical sensor; partially fusing the copy sheet at the leading edge in the fuser nip; reversing the fuser roll drive to back the partially fused copy sheet out of the fuser nip region; stripping the partially fused copy sheet from the fuser roll by prefuser stripper fingers; advancing the fuser drive and the copy sheet in the forward process direction to completely fuse the copy sheet; and stripping the completely fused copy sheet from the fuser roll by post fuser stripper fingers. A sensor capable of detecting heavily toned lead edges of copy sheets is positioned in a post development area....