Browse Prior Art Database

TRIPLE FUNCTION SYSTEM USING READ/WRITE BAR

IP.com Disclosure Number: IPCOM000025422D
Original Publication Date: 1985-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 132K

Publishing Venue

Xerox Disclosure Journal

Abstract

Toner raster input scanning (TRIS) systems and raster output scanning (ROS) systems are known to those skilled in the art of electrophotostatic copiers. (See U.S. Patent 4,042,967.) One method to provide such a machine having both these capabilities is to have two development areas. In the past this was accomplished by two separate and complete development systems with the optics necessary to perform the TRIS and ROS functions located between them.

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XEROX DISCLOSURE JOURNAL

TRIPLE FUNCTION SYSTEM USING
READ/WRITE BAR U.S. CI. 358/300
Christopher Snelling

Proposed Classification

Int. CI. H04n 1/30

Toner raster input scanning (TRIS) systems and raster output scanning (ROS) systems are known to those skilled in the art of electrophotostatic copiers. (See
U.S. Patent 4,042,967.) One method to provide such a machine having both these capabilities is to have two development areas. In the past this was accomplished by two separate and complete development systems with the optics necessary to perform the TRIS and ROS functions located between them.

This disclosure relates to a configuration requiring only one development assembly. The Figure shows development assembly I located along a section of photoreceptor belt 2. While not shown, this belt would normally pass through other stations of an electrophotostatic copier such as a charging station, exposure station, which may include a conventional glass platen and optics, transfer station, and cleaning station. Inside development assembly 1 is toner sump 3, donor roll 4, and development rollers 5 and 6. Located next to each of development rollers 5 and 6 are doctor blades 8 and 9 respectively. Doctor

Volume 10 Number 2 March/April 1985 107

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TRIPLE FUNCTION SYSTEM USING READ/WRITE BAR (Cont'd)

blades 8 and 9 trim toner off the development rollers 5 and 6. In their on positions, each doctor blade device positions its blade so as to allow the correct thickness of toner needed for development. In the off position, each doctor blade rernoves all toner from the development roller to prevent development of any latent image of belt 2. In the Figure, doctor blade 8 is in the on position and doctor knife 9 is in the off position. Between development rollers 5 and 6 and located along photoreceptor belt 2 is read/write bar 10. Read/write bar 10 is surrounded by case 11 through which air is discharged around read/write bar 10 to keep it relatively free from particles of toner.

The first mode is for ROS copying. In this mode photoreceptor belt 2 is charged at the charging station (not shown) but not exposed to any light. When the charged belt 2 enters the development area, doctor blade 8 is moved to the off (shown in phantom) position and strips all toner from development roller 5. As photoreceptor 2 passes over read/write bar 10, read/write bar 10 exposes photoreceptor 2 with the desired image. Doctor blade 9 is moved to the on (shown in phantom) position and allows toner to adhere to development roller 6 which then develops the laten...