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DETONING OF DUAL ELECTROSTATIC BRUSH (ESB) CLEANERS

IP.com Disclosure Number: IPCOM000027025D
Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 116K

Publishing Venue

Xerox Disclosure Journal

Abstract

Conventional detoning of an electrostatic brush (ESB) cleaner involves a scraper blade used to remove toner from the detoning roll. This method of cleaning the detoning roll is inefficient when compared to the brush cleaning process of the photoreceptor. The process of removing toner from a photoreceptor depends on the number of brush fiber-to-photoreceptor contacts. Hence, running the brush at surface speeds several times greater than that of the photoreceptor improves the ability of the cleaner brush to remove toner from the photoreceptor. During detoning this process is reversed - the toner needs to move from the brush to a detoning roll. The limited surface area and the low surface speed of the detoning roll make it difficult to move the toner to the detoning roll from the brush. The strongly charged toner and bias brush that attract the toner particles, tend to make it difficult to remove the toner from the brush.

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XEROX DISCLOSURE JOURNAL

DETONING OF DUAL Proposed Classification ELECTROSTATIC BRUSH (ESB) U.S. C1.355/301
CLEANERS Int. C1. G03g 21/00
N. Kedarnath

12

5

FIGURE I

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 6 November/December 1994 495

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DETONING OF DUAL ELECTROSTATIC BRUSH (ESB) CLEANERS(cont'd)

Conventional detoning of an electrostatic brush (ESB) cleaner involves a scraper blade used to remove toner from the detoning roll. This method of cleaning the detoning roll is inefficient when compared to the brush cleaning process of the photoreceptor. The process of removing toner from a photoreceptor depends on the number of brush fiber-to-photoreceptor contacts. Hence, running the brush at surface speeds several times greater than that of the photoreceptor improves the ability of the cleaner brush to remove toner from the photoreceptor. During detoning this process is reversed - the toner needs to move from the brush to a detoning roll. The limited surface area and the low surface speed of the detoning roll make it difficult to move the toner to the detoning roll from the brush. The strongly charged toner and bias brush that attract the toner particles, tend to make it difficult to remove the toner from the brush.

Figure 1 shows a dual electrostatic brush cleaning apparatus 10, in a 3 0' clock position, that shows an improved detoning method without the use of detoning rolls or scraper blades. The cleaning apparatus shows two electrostatic brushes 5, each having a housing 7 consisting partially of a perforated screen for detoning each brush 5.

Critical to reliable operation of this cleaner is a pre-clean charging scheme that disc...