Browse Prior Art Database

FUSER ROLL INDEXING DURING STANDBY

IP.com Disclosure Number: IPCOM000027141D
Original Publication Date: 1995-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 134K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present proposal addresses indexing a fuser roll three to four times after each copy job after a copy machine has gone into a standby condition. The improvements offered by the proposal include: eliminating "derubbering" of the fuser roll, increased lifetime of the fuser roll, decreased service cost associated with a web Release Agent Management (RAM) system, and increased reliability for a duplex feeder.

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XEROX DISCLOSURE JOURNAL

FUSER ROLL INDEXING DURING STANDBY U.S. C1.355/290 Frederich C. DeBolt
Kenneth R. Rasch

Proposed Classification

Int. C1. G03g 15/20

' The present proposal addresses indexing a fuser roll three to four times after each copy job after a copy machine has gone into a standby condition. The improvements offered by the proposal include: eliminating "derubbering" of the fuser roll, increased lifetime of the fuser roll, decreased service cost associated with a web Release Agent Management (RAM) system, and increased reliability for a duplex feeder.

In electrophotographic printing machines that utilize a Silicone on Silicone Soft Roll Fuser, both a fuser roll and a pressure roll are coated with silicone rubber of similar chemical formulation. In order to facilitate the release of toner carrying copy sheets from the fuser roll, an oil impregnated web RAM system is employed. The web is passed across the fuser roll and applied to it by a silicone foam pinch roll which produces an oil nip of approximately 5 millimeters in width. During normal printing machine operation, the web moves at a velocity of 2 millimeters per minute and advances in a tangential direction opposite the fuser roll. This produces an average oil deposition rate of 0.2 -0.3 pl/copy. In standby conditions, the residual oil left on the surface of the fuser roll is absorbed and maintains favorable release characteristics inherent in the silicone rubber material.

As the number of copies made exceeds 20 copies per start, the oil rate dispensed by the web decreases. When several hundred or thousand copies are made in a short period of time, the oiling rate per copy drops drastically. If the printing machine is left in a standby condition for an extended period of time (overnight or over a weekend) after running in this fashion, the fuser roll rubber is likely to adhere to the pressure roll and "derubber" from itself. In other words, the fuser roll rubber separates from itself across a thickness of approximately 0.010 inches. The action results in a service call due to unfused areas on the copy sheet where the fuser roll failed. The defect condition is a lack of an oil boundary layer between the two roll surfaces. The present proposal addresses indexing...