Browse Prior Art Database

A DEVELOPMENT SYSTEM

IP.com Disclosure Number: IPCOM000024861D
Original Publication Date: 1982-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 121K

Publishing Venue

Xerox Disclosure Journal

Abstract

It has been found that development of an electrostatic latent image in an electrophotographic printing machine can be improved by controlling the spacing between the photoconductive surface and the developer roller. With the increased usage of flexible photoconductive belts and magnetic brush developer rollers, it is feasible to control the spacing therebetween. When the photoconductive belt is maintained at the proper tensioning, it is practical to permit the developer material to space the photoconductive belt from the developer roller. As shown in the drawing, development system 38 includes a housing 68 defining a chamber for storing a supply of insulating developer material therein. A pair of augers 70 mix developer material in the chamber of housing 60 and advance the developer material to developer roller 40. Developer roller 40 advances the insulating developer material into contact with the electrostatic latent image recorded on

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A

'EROX DISCLOSURE JOURNAL

A DEVELOPMENT SYSTEM
Proposed C. J. Hatch Classification

U.S. C1. 4271147 Int. C1. B4lm 5/00

It has been found that development of an electrostatic latent image in an electrophotographic printing machine can be improved by controlling the spacing between the photoconductive surface and the developer roller. With the increased usage of flexible photoconductive belts and magnetic brush developer rollers, it is feasible to control the spacing therebetween. When the photoconductive belt is maintained at the proper tensioning, it is practical to permit the developer material to space the photoconductive belt from the developer roller. As shown in the drawing, development system 38 includes a housing 68 defining a chamber for storing a supply of insulating developer material therein. A pair of augers 70 mix developer material in the chamber of housing 60 and advance the developer material to developer roller 40. Developer roller 40 advances the insulating developer material into contact with the electrostatic latent image recorded on

Volume 7 Number 3 May/June 1982 207

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A DEVELOPMENT SYSTEM (Cont'd)

photoconductive belt 10. A movable trim bar 70 controls the thickness of the developer pile height on developer roller 40. The tangential velocity of developer roller 40 is in the same direction and about two to three times the magnitude of the velocity of belt 10. The compressed pile height is about 0.050 centimeters for development of solid areas and about 0.180 centimeters for development of lines. A rack and gear assembly driven by a motor, shown generally by the reference numeral 74, is coupled to trim bar 72. The rack and gear assembly translates trim bar 72 in the direction of arrow 76. As trim bar 72 translates, the lead edge 78 thereof moves closer to and further away from the circumferential surface of developer roller 40. In this way, the thickness of the layer of insulating developer material adhering to developer roller 40 is suitably adjusted to regulate the compressed pile height of the developer material to the desired level....