Browse Prior Art Database

COMPACT HIGH-SPEED DEVELOPMENT AND APPARATUS

IP.com Disclosure Number: IPCOM000023786D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 225K

Publishing Venue

Xerox Disclosure Journal

Abstract

In high-speed electrophotographic development machines, it is especially important to remove any background particles which may be present after development. The figure illustrates a system which utilizes a minimum of development rolls when used in conjunction with a post-development image clean system.

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XEROX DISCLOSURE JOURNAL

COMPACT NIGH-SPEED DEVELOPMENT ~S5AND APPARATUS
E. F. Young

Proposed Classification

U.S. Cl. 118/652 Tnt. Cl. G03g 15/06

In high-speed electrophotographic development machines, it is especially important

to remove any background particles which may be present after development. The figure illustrates a system which utilizes a minimum of development rolls when used in conjunction with a post-development image clean system.

A photoreceptor belt 2, after being exposed to an image light pattern, is moved passed development rolls 3 and 4. The rolls move developer having an appropriate charge from sump 5 in proximity to the belt surface so as to cause development of the image area, The toner concentration is set high enough so that the image is

developed without regard to background development, thereby resulting in some toner particles becoming loosely attached to the background (non-image) areas of the belt. Magnetic brush 6 acts as a scavenger to remove the unwanted background toner (a non-detrimental amount of toner from the image area is also unavoidably removed). A biased reclaim roller 7 removes the scavenged toner and deposits it

back into sump 5. Discharge bar 8 is used to discharge any charge placed on the carrier beads by the bias placed on reclaim roller 7.

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Volume 4 Number I January/February 1979 19

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