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SELF-CLEANING POWER SUPPLY OUTPUT FOR WIRE CORONA DEVICES

IP.com Disclosure Number: IPCOM000026850D
Original Publication Date: 1994-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 121K

Publishing Venue

Xerox Disclosure Journal

Abstract

Corona wires in corona devices such as a wire corotron or a wire scorotron tend to collect contaminants such as dust, paper fibers or other dirt particles over their operating life. In order to maintain high print quality in Xerographic printing machines corona wires must be periodically serviced to have contaminants removed from them, since contaminated corona wires can cause problems in the Xerographic printing process such as arc discharges or copy deletions. Several methods have been used to facilitate cleaning a corona wire: in mid to high volume printing machines, relatively sophisticated motor driven devices mechanically operate cleaning pads across corona wires to remove contaminants collected on them; and in low volume printing machines, simpler methods such as hand operated mechanical cleaning pads are used to clean corona wires. If either cleaning method is used to clean corona wires, corona wires often become contaminated and result in service calls. In order to improve the overall robustness of a printing machine over its operating life, an improved method of cleaning corona wires is proposed that repels contaminants collected on corona wires without using the above noted motor driven cleaning devices or hand operated cleaning devices.

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XEROX DISCLOSURE JOURNAL

SELF-CLEANING POWER SUPPLY Proposed Classification OUTPUT FOR WIRE CORONA
DEVICES Int. C1. HOlt 19/04 Thomas I. Yeh

U.S. C1.2501326

Corona wires in corona devices such as a wire corotron or a wire scorotron tend to collect contaminants such as dust, paper fibers or other dirt particles over their operating life. In order to maintain high print quality in Xerographic printing machines corona wires must be periodically serviced to have contaminants removed from them, since contaminated corona wires can cause problems in the Xerographic printing process such as arc discharges or copy deletions. Several methods have been used to facilitate cleaning a corona wire: in mid to high volume printing machines, relatively sophisticated motor driven devices mechanically operate cleaning pads across corona wires to remove contaminants collected on them; and in low volume printing machines, simpler methods such as hand operated mechanical cleaning pads are used to clean corona wires. If either cleaning method is used to clean corona wires, corona wires often become contaminated and result in service calls. In order to improve the overall robustness of a printing machine over its operating life, an improved method of cleaning corona wires is proposed that repels contaminants collected on corona wires without using the above noted motor driven cleaning devices or hand operated cleaning devices.

Wire corona devices are used in Xerography for charging photoreceptors, transferring toner to paper, detacking paper from photoreceptors and precleaning photoreceptors. Power supples connected to wire corona devices typically generate high voltages in a polarity that produces a desired corona effect for Xerographic printing. The proposed method incorporates an additional feature into the power supply of a printer to facilitate removal of contaminants collected on a corona wire in a corona device. The corona wire, which is attached to the corona device at each end point of the wire, h...