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Browse Prior Art Database

PREVENTING COMETS ON PHOTORECEPTORS

IP.com Disclosure Number: IPCOM000027249D
Original Publication Date: 1995-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 122K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed are methods and apparatus for preventing comets on photoreceptors. Comets are spots of toner or other developer debre that builds up on the photoreceptor and eventually prints out as spots on the copies or prints. In certain circumstances, it has been found that when the spots blade is removed, the comets disappear. It has also been observed that in non-MICR (magnetic image character recognition) containing toner formulation applications, there generally is no comet problem. Thus, it is believed that the magnetite contained in MICR toner formulations becomes lodged under the spots blade and thereby acts as a mild abrasive which polishes the photoreceptor, and at the same time prevents comets.

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I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I

XEROX DISCLOSURE JOURNAL

PREVENTING COMETS ON PHOTORECEPTORS Eugene F. Young

Proposed Classification
U.S. C1.3551297 Int. C1. G03g 21/00

Disclosed are methods and apparatus for preventing comets on photoreceptors. Comets are spots of toner or other developer debre that builds up on the photoreceptor and eventually prints out as spots on the copies or prints. In certain circumstances, it has been found that when the spots blade is removed, the comets disappear. It has also been observed that in non-MICR (magnetic image character recognition) containing toner formulation applications, there generally is no comet problem. Thus, it is believed that the magnetite contained in MICR toner formulations becomes lodged under the spots blade and thereby acts as a mild abrasive which polishes the photoreceptor, and at the same time prevents comets.

In one embodiment, there is provided an abrasive in the body or bulk of a cleaner blade so that it can burnish the photoreceptor and thereby remove any comets formed thereon. Examples of suitable abrasives that can be loaded into the cleaner blade include magnetite, cerium oxide, aluminum oxide, strontium-titanate, and the like. The blade can be loaded with the abrasive material at a level from about 0.1 percent to about 30 percent by weight of the blade composition. The actual level selected will depend on the particular application.

In another embodiment, there is provided an abrasive web to burnish the photoreceptor and thereby remove comets thereon. Thus, it is proposed that in addition to a spot blade cleaner, or as a substitute for a spots blade cleaner, a web is provided that contacts the photoreceptor and which web contains an abrasive agent either in, or on, the surface of the web. Examples of abrasives and useful amounts are as indicated above. The web can be configured in several forms. One example is an elastomer that is bulk loaded with the abrasive material. Preferably, the web is in contact with the photoreceptor and be advanced slowly to provide a fresh surface as necessary for...