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PRENIP CHARGING OF TONER PARTICLES

IP.com Disclosure Number: IPCOM000025376D
Original Publication Date: 1985-Feb-28
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal

Abstract

In order to reduce the magnitude of wrong sign toners adhering to the developer roller, a charging electrode charges the toner particles on the developer roller prior to the toner entering the development zone. The charging electrode contacts the toner particles. The toner particles are biased with respect to the developer roller. In this way, a charge is produced on the toner particles appropriate for development. In the case of an insulative or semi-insulative toner particle, this charge is transferred from the charging electrode to a thin layer of toner particles at the surface of the brush. The charge will penetrate into the layer of toner particles if the layer is tumbled or otherwise agitated. This may be achieved by arranging the magnetic poles structure of the developer roller to produce mixinE. Thus, the charging and subsequent mixing in a predevelopment zone reduces the magnitiude of wrong-sign toner particles advanced to the development zone.