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WEB INDEXING CONTROL THROUGH SOFTWARE

IP.com Disclosure Number: IPCOM000025951D
Original Publication Date: 1989-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 98K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine using soft roll fusing, it is often necessary to apply a small amount of release agent to the surface of the roll in order to aid in the release of the'copy sheet having the fused toner image thereon from the roll surface. This may be accomplished by advancing a web, presoaked with a release agent, into intimate contact with the fuser roll surface. The web is advanced through the nip defined by the web and roll at a specific rate. The rate varies and depends upon the amount of release material required for adequate release. The web is advanced from a supply roll around a backup roll onto a takeup roll. The backup roll presses the web against the fuser roll to define the nip therebetween. It is required that the indexing rate of the web through the nip be a constant. Thus, the motor driving the takeup roll is energized for a specified time period after a selected number of copies have passed through the fuser. As the web advances onto the takeup roll, the diameter of this roll increases. In order to advance the web at a constant rate in the nip region, it is necessary to change the amount of time that the motor is energized for the selected number of copies. The following equations may be used, in an iterative manner, to calculate the required time that the takeup reel motor should be energized:

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XEROX DISCLOSURE JOURNAL

WEB INDEXING CONTROL THROUGH SOFTWARE Michael R. Elter
Michael E. Beard

Proposed Classification
U.S. c1.355/3 Int. C1. G03g 15/00

In an electrophotographic printing machine using soft roll fusing, it is often necessary to apply a small amount of release agent to the surface of the roll in order to aid in the release of the'copy sheet having the fused toner image thereon from the roll surface. This may be accomplished by advancing a web, presoaked with a release agent, into intimate contact with the fuser roll surface. The web is advanced through the nip defined by the web and roll at a specific rate. The rate varies and depends upon the amount of release material required for adequate release. The web is advanced from a supply roll around a backup roll onto a takeup roll. The backup roll presses the web against the fuser roll to define the nip therebetween. It is required that the indexing rate of the web through the nip be a constant. Thus, the motor driving the takeup roll is energized for a specified time period after a selected number of copies have passed through the fuser. As the web advances onto the takeup roll, the diameter of this roll increases. In order to advance the web at a constant rate in the nip region, it is necessary to change the amount of time that the motor is energized for the selected number of copies. The following equations may be used, in an iterative manner, to calculate the required time that the takeup reel motor should be energized:

  d = wrt Rn = Ro + H t = dT/C

where

d is the distance the web indexes through the nip, t is time the takeup reel motor is energized,
w is the angular velocity...