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Browse Prior Art Database

ELECTROSTATIC DETACK APPARAT AND METHOD

IP.com Disclosure Number: IPCOM000025105D
Original Publication Date: 1983-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 78K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a xerographic reproduction machine there is provided apparatus for partially neutralizing charge on the backside of a copy sheet electrostatically adhered to a photoconductive surface. Included in the apparatus is a conductive wire having a relatively thick insulative outer coating which is sufficiently thick that with an AC voltage applied to the conductive wire there is substantially no net DC current flow from the wire in the absence of an external electrostatic field. Such a construction of wire and outer coating is known as a dicorotron electrode. A net positive current flows from the wire to the back of the paper when an external electrostatic field is established between the conductive shield and the copy sheet by moving said copy sheet with a positive voltage on its backside past the conductive wire. A resistor connecting a conductive shield positioned to the side of the conductive wire opposite the backside of the copy sheet establishes a bias voltage for the shield as a result of current flow from the conductive wire to the shield and through the resistor.

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ELECTROSTATIC DETACK APPARATUS Proposed Classification AND METHOD U.S. C1. 355/3R Cristian 0. Abreu Int. C1. C03g 15/00

In a xerographic reproduction machine there is provided apparatus for partially neutralizing charge on the backside of a copy sheet electrostatically adhered to a photoconductive surface. Included in the apparatus is a conductive wire having a relatively thick insulative outer coating which is sufficiently thick that with an AC voltage applied to the conductive wire there is substantially no net DC current flow from the wire in the absence of an external electrostatic field. Such a construction of wire and outer coating is known as a dicorotron electrode. A net positive current flows from the wire to the back of the paper when an external electrostatic field is established between the conductive shield and the copy sheet by moving said copy sheet with a positive voltage on its backside past the conductive wire. A resistor connecting a conductive shield positioned to the side of the conductive wire opposite the backside of the copy sheet establishes a bias voltage for the shield as a result of current flow from the conductive wire to the shield and through the resistor.

An AC voltage is applied to the dicorotron electrode with the shield connected to ground through an impedance such as a resistor 76. With such an arrangement, when the photoconductive surface with the sheet 40 adhered thereto through electrostatic bonds resulting from the transfer...