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CROSS SCANNING FULL WIDTH ARRAY THERMAL INK JET HEAD WITH ELECTROSTATIC PAPER TRANSPORT

IP.com Disclosure Number: IPCOM000026558D
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 69K

Publishing Venue

Xerox Disclosure Journal

Abstract

Methods of extending thermal ink jet technology to high copy speeds have relied in the past on the use of full width array thermal ink jet heads. Specific methods of implementation have traditionally focussed upon the use of a stationary head with a controlled velocity transport. This approach has .the complex problems associated with it of precise control of paper velocity, how to accomplish intersheet "guttering", and the specific embodiment of long term head maintenance mechanisms.

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XEROX DISCLOSURE JOURNAL

CROSS SCANNING FULL WIDTH ARRAY THERMAL INK JET HEAD WITH ELECTROSTATIC PAPER TRANSPORT
George J. Roller

Proposed Classification US. C1.346/146
Int. C1. Gold 9/00

Methods of extending thermal ink jet technology to high copy speeds have relied in the past on the use of full width array thermal ink jet heads. Specific methods of implementation have traditionally focussed upon the use of a stationary head with a controlled velocity transport. This approach has .the complex problems associated with it of precise control of paper velocity, how to accomplish intersheet "guttering", and the specific embodiment of long term head maintenance mechanisms.

An alternative to this approach is an electrostatic transport (EST) which transports a copy sheet to an imaging area. The EST then stops and the full width array thermal ink jet head is "scanned" across the sheet in the cross direction (the direction perpendicular to sheet travel). This allows the use of well known optical scanning technology. Intersheet "guttering" can more easily be accomplished at "guttering" stations at end of scan points which are located off of the EST and acompletely out of the paper transport mechanism areas. These points can also be used for long term head maintenance. A heater may additionally be incorporated within the EST module for a desired back side heating for ink drying.

This technique is viable up to a copy rate of about 75 copies per minute. At such higher speeds...