System and method for detecting bias transfer roll positions using resistance detection

Patent metadata

Field	Value
Publication number	US-9014585-B2
Application number	US-201313839711-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 15, 2013
Publication date	Apr 21, 2015
Grant date	Apr 21, 2015

Abstract

A system and method is provided for determining the location of one or more biased transfer rolls relative to associated photoreceptors in a printer. The one or more biased transfer rolls can be moved into contact with an intermediate transfer surface bringing the surface into contact with associated photoreceptors to form a closed biased transfer roll image transfer nip for transferring an image from the photoreceptor to the intermediate transfer surface. The open or closed condition of the biased transfer roll image transfer nip is determined by applying a constant current to the biased transfer roll and evaluating a voltage at the biased transfer roll. The open or closed condition of different image transfer nips can be determined in a similar manner. A plurality of biased transfer rolls can be ganged together for simultaneous movement with respect to associated photoreceptors to form a plurality of image transfer nips, the open and closed condition which can also be determined.

First claim

The invention claimed is:

1. A method of determining a location of a biased transfer roll in a printer having an image transfer nip formed by an intermediate transfer surface disposed between a biased transfer roll movable relative to an associated photoreceptor, the method comprising:
connecting a power supply operating in constant current mode to the biased transfer roll;
measuring a voltage directly across the biased transfer roll; and
a controller determining the image tra…

Assignees

• Xerox Corp

Inventors

• Washington John
• Buzzelli John
• Kurz Karl
• Thompson Allen

Classifications

• G03G15/1605 Primary

  Physics · mapped topic

• G03G2215/0193

  Physics · mapped topic