Browse Prior Art Database

Magnetic Brush Roll Cleaning

IP.com Disclosure Number: IPCOM000077539D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Brown, LC: AUTHOR [+3]

Abstract

In order to clear the magnetic brush developer of an electrophotographic graphic apparatus and thus not needlessly abrade the surface of the photoconductor in regions which are not required to be developed such as the entire photoconductive surface, during run out cycles and timing in cycles, the chain bucket developer mix conveyor 10 is driven independently from the brush roll.

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Magnetic Brush Roll Cleaning

In order to clear the magnetic brush developer of an electrophotographic graphic apparatus and thus not needlessly abrade the surface of the photoconductor in regions which are not required to be developed such as the entire photoconductive surface, during run out cycles and timing in cycles, the chain bucket developer mix conveyor 10 is driven independently from the brush roll.

Motor 12, which is controlled by the logic 14 of the electrophotographic reproduction apparatus, is operated such that the developer roll 16 or magnetic roll is supplied developer mix only during those portions of the cycle wherein development is to occur. This then converts the magnetic roll 16 into a magnetic brush 16 at those times, and allows the magnetic brush to clear itself of developer mix during the times when there is no requirement for development. This reduces the abrasion and wear on the photoconductor 18 and prolongs photoconductor life. The magnetic brush roll continues to rotate, so that the magnetic brush is starved of developer mix when the chain buckets are stopped. The starved magnetic roll does not require as high a start up force to initiate rotation at the beginning of a cycle, and allows movement for servicing without forcing a solid mass of developer mix against the photoconductor.

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