Browse Prior Art Database

INTERMEDIATE TRANSFER COMPENSATION SYSTEM FOR XEROGRAPHIC PRINTERS

IP.com Disclosure Number: IPCOM000026731D
Original Publication Date: 1993-Jun-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 85K

Publishing Venue

Xerox Disclosure Journal

Abstract

A transfer compensation system for a xerographic printing machine having an intermediate transfer surface (belt) with a bias roll is disclosed. Transfer compensation systems, in general, have a tendency to leave a residual layer of toner on the intermediate transfer surface. When transferring a series of CMYK (cyan, magenta, yellow, black) toner layers over an intermediate surface, the color toner layer at the bottom of the intermediate surface has a tendency to transfer the least amount of toner. This partial transfer of toner may result in potential color shifts if the toner discrepancy is not compensated for by the xerographic system. Accordingly, if the amount of residual toner on the intermediate surface after transfer is stable and constant over time and system conditions, color shift compensation requires only that more mass/area (MIA) of toner be incorporated into the bottom toner layer as positioned on the intermediate transfer surface. The machine, however, must be additionally monitored by a process control system to compensate for color shifting, since some color shifting of the residual toner may be due to toner charge changes or other machine parameter changes that occur with time.

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XEROX DISCLOSURE JOURNAL

INTERMEDIATE TRANSFER COMPENSATION SYSTEM FOR XEROGRAPHIC PRINTERS Gerald M. Fletcher

Proposed Classification
U.S. C1.355/274 Int. C1. G03g 15/16

A transfer compensation system for a xerographic printing machine having an intermediate transfer surface (belt) with a bias roll is disclosed. Transfer compensation systems, in general, have a tendency to leave a residual layer of toner on the intermediate transfer surface. When transferring a series of CMYK (cyan, magenta, yellow, black) toner layers over an intermediate surface, the color toner layer at the bottom of the intermediate surface has a tendency to transfer the least amount of toner. This partial transfer of toner may result in potential color shifts if the toner discrepancy is not compensated for by the xerographic system. Accordingly, if the amount of residual toner on the intermediate surface after transfer is stable and constant over time and system conditions, color shift compensation requires only that more mass/area (MIA) of toner be incorporated into the bottom toner layer as positioned on the intermediate transfer surface. The machine, however, must be additionally monitored by a process control system to compensate for color shifting, since some color shifting of the residual toner may be due to toner charge changes or other machine parameter changes that occur with time.

The disclosed system compensates for the lack of complete toner transfer of the last layer of multipl...