Browse Prior Art Database

SMALL, LOW COST STATIC ELIMINATOR

IP.com Disclosure Number: IPCOM000026596D
Original Publication Date: 1992-Dec-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 92K

Publishing Venue

Xerox Disclosure Journal

Abstract

The dissipation of electrostatic charge, within a xerographic copying system, improves the reliability of paper handling by eliminating both paper slipping and paper stalling. A simple graphite brush comprising a passive static eliminator in contact with charged sheets of paper reduces the amount of charge to 20 nanocoulombs per sheet. In other instances, active static eliminators are used to prevent the electrostatic discharges experienced by machine operators removing many sets of copies from an output device whereupon the accumulated charge on the resulting stack of paper is large enough to cause a noticeable shock.

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XEROX DISCLOSURE JOURNAL

SMALL, LOW COST STATIC ELIMINATOR
Joan R. Ewing

Proposed Classification US. C1.308/226
Int. C1. G036g 21/00

The dissipation of electrostatic charge, within a xerographic copying system, improves the reliability of paper handling by eliminating both paper slipping and paper stalling. A simple graphite brush comprising a passive static eliminator in contact with charged sheets of paper reduces the amount of charge to 20 nanocoulombs per sheet. In other instances, active static eliminators are used to prevent the electrostatic discharges experienced by machine operators removing many sets of copies from an output device whereupon the accumulated charge on the resulting stack of paper is large enough to cause a noticeable shock.

Active static eliminators are usually capacitively coupled corona charging devices. They operate at a fre uency of 60 Hertz and at a voltage level of

high voltage necessitates the use of a low capacitance high voltage shielded cable connected to a corresponded large, heavy, and relatively expensive power

The present invention discloses a feedback controlled DC powered active static eliminator wherein feedback to the first brush is provided by a second brush juxtaposed to the first. Both static eliminator brushes must be in contact with a sheet of paper. A DC operating bias is applied and is within the range of k
500 volts thereby enabling the first brush to neutralize any practical amount of static charge existing on...