Browse Prior Art Database

Original Publication Date: 1984-Jun-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


Uncharged, raw toner, added to maintain the toner concentration in the developer sump of an electrostatographic copier generally requires a certain amount of time to mix and acquire a reasonable charge on the individual toner particles. Prior to acquiring this charge any new added toner can adversely effect copy quality. This disclosure is directed to pre-charging the toner and introducing it directly into the developer sump of such a copier in the charged state. Several different embodiments are described which rely on the use of a single component developer for the pre-charged dispense function wherein toner originally contained in a gravity feed sump passes through a fiber mesh, reaches the surface of a rotating anodized aluminum roll, for example, and becomes triboelectrically charged by the rubbing action of the fiber mesh and the roll interface. Rotation of the dispenser roll thereafter carries the charge toner into contact with a cascading stream of carrier or developer which removes the pre-charged toner from the dispenser roll.