Browse Prior Art Database

HIGH PRODUCTIVITY MULTI-PASS COLOR ENGINE

IP.com Disclosure Number: IPCOM000026570D
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 94K

Publishing Venue

Xerox Disclosure Journal

Abstract

Some color copier configurations require "multi-pass transfer", which means that each sheet is routed a number of times through the same xerographic transfer zone. A different color - separation image is put on the sheet with each pass. The sheets are firmly held by a roll or loop recirculating mechanism to maintain registration between transfer passes. Up to four color transfers are done (cyan, magenta yellow and black), involving a like number of passes for each sheet. After all of the colors have been received, the sheet goes through a fuser station to fix the combined image to the sheet.

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XEROX DISCLOSURE JOURNAL

HIGH PRODUCTIVITY MULTI- PASS COLOR ENGINE

Lam F. Wong
Jacob N. Kluger Lisbeth S. Quesnel David M. Attridge

Proposed Classification
U.S. C1.3551272 Int.
C1. G03g 15/14

Vacuum

Tray

Tack Corotron

FIG. I (if needed)

XEROX DISCLOSURE JOURNAL - Vo1.17 No. 5 September/October 1992 351

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HIGH PRODUCTIVITY MULTI-PASS COLOR ENGINE(Cont'd)

Some color copier configurations require "multi-pass transfer", which means that each sheet is routed a number of times through the same xerographic transfer zone. A different color - separation image is put on the sheet with each pass. The sheets are firmly held by a roll or loop recirculating mechanism to maintain registration between transfer passes. Up to four color transfers are done (cyan, magenta yellow and black), involving a like number of passes for each sheet. After all of the colors have been received, the sheet goes through a fuser station to fix the combined image to the sheet.

The critical problems to overcome with this type of system are the productivity and sheet size latitude. The Figure discloses a solution to these problems and attains the highest possible productivity by using multiple-sheet pitch and processing of A4 or smaller size sheets by use of a gripperless color registration transfer roll approach. The gripperless transfer roll is made large enough to handle short edge feed of A3 sheets. The A3 print productivity will b...