Browse Prior Art Database

A DEVELOPMENT SCAVENGING DEVICE

IP.com Disclosure Number: IPCOM000023873D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 247K

Publishing Venue

Xerox Disclosure Journal

Abstract

In electrophotographic printing, a latent image is recorded on a photoconductive member 10. Toner particles are deposited on the latent image by a development apparatus to render the latent image visible. Improved development apparatus 12 includes a magnetic member 14 which is mounted rotatably within a stationary cylindrical shell 16. Shell 16 includes an outwardly extending protrusion 18. Region 20 between protrusion 18 and photoconductive member 10 defines the development zone. In operation, toner particles advance in the direction of arrow

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DEVICESCAVENGINGDEVELOPMENTAXEROX DISCLOSURE JOURNAL

L. Bean

Proposed Classification
U.S. CL 427/145

Tnt. Cl. B41m 5/16

20

In electrophotographic printing, a latent image is recorded on a photoconductive member 10. Toner particles are deposited on the latent image by a development

apparatus to render the latent image visible. Improved development apparatus 12 includes a magnetic member 14 which is mounted rotatably within a stationary cylindrical shell 16. Shell 16 includes an outwardly extending protrusion 18. Region 20 between protrusion 18 and photoconductive member 10 defines the development zone. In operation, toner particles advance in the direction of arrow

22 over protrusion 20 so as to contact photoconductive member 10 in development zone 24. The toner travels behind the corona-~generating device 24. Corona-

generating device 24 sprays a charge on the developed photoconductive member such that background toner charge is reduced essentially to zero or to a value such that it may be magnetically scavenged from photoconductive member 10,

As toner particles continue to move into scavenging zone 26, the background particles are attracted magnetically from photoconductive member 10 to shell 16.

Thus, the system is ideally suited to development and scavenging since the magnetic forces are lowest in the development zone allowing maximum toner

deposition and highest in the scavenging zone.

Volume 4 Number I January/February 1979 123

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