Browse Prior Art Database

CHARGED TONER DISPENSING SYSTEMS

IP.com Disclosure Number: IPCOM000025285D
Original Publication Date: 1984-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 112K

Publishing Venue

Xerox Disclosure Journal

Abstract

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.

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XEROX DISCLOSURE JOURNAL

CHARGED TONER DISPENSING SYSTEMS Proposed William M. Schwarz Classification

U.S. C1. 355/3DD Int. C1. G03g 15/00

FIG. 2

Volume 9 Number 3 May/June 1984 199

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CHARGED TONER DISPENSING SYSTEMS (Cont'd)

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.

This general technique is illustrated in Figure 1 wherein a toner sump 10 is filled with an uncharged toner material 12. The top of the sump is covered with a plastic mesh 14 separating the bulk of the toner supply from a rotatable anodized aluminum roll 16, all of which is placed adjacent to the return carrier or developer stream. Figure 1 also has the variant of including a bead removal blade 18 in the event that any carrier beads remain tacked to the aluminum roll.

Figure 2 ill...