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Browse Prior Art Database

TONER MOVEMENT INDUCING DEVICE

IP.com Disclosure Number: IPCOM000027135D
Original Publication Date: 1995-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 163K

Publishing Venue

Xerox Disclosure Journal

Abstract

A device for inducing continuous movement of toner to assist transport of toner from a toner dispenser to a developer housing is disclosed. The presently disclosed toner movement inducing device is directed toward the problem of toner bridging which often occurs in the drop tube between a toner dispenser bottle and a developer housing in an electrostatographic printing machine.

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XEROX DISCLOSURE JOURNAL

TONER MOVEMENT INDUCING Proposed Classification DEVICE U.S. C1.355/245 Teresa A. Kime
Richard
C. Boykin
Leon
G. Po lawski
Thomas
J.

E ocha

Int. C1. G03g 15/06

FIG. 1

XEROX DISCLOSURE JOURNAL - Vol. 20, No. 3 May/June 1995 237

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TONER MOVEMENT INDUCING DEVICE (Cont'd)

FIG2

238 XEROX DISCLOSURE JOURNAL - Voi. 20, No. 3 May/June 1995

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TONER MOVEMENT INDUCING DEVICE (Cont'd)

A device for inducing continuous movement of toner to assist transport of toner from a toner dispenser to a developer housing is disclosed. The presently disclosed toner movement inducing device is directed toward the problem of toner bridging which often occurs in the drop tube between a toner dispenser bottle and a developer housing in an electrostatographic printing machine.

In a typical electrophotographic printing machine, toner particles are continuously transported to a developer housing for developing electrostatic latent images on a photoconductive surface. It is generally well known that the density of concentration of toner particles in the developer housing must be . maintained within an appropriate range in order to continuously obtain copies having a desired density. Toner particles are continuously being depleted from the developer material as copies are being formed such that a continuous supply of new toner particles must be delivered to the developer housing. However, systems used to replenish toner particles into the developer housing are fairly inaccurate, since the repeatability of toner particle flow under identical conditions is poor. As a result, the amount of toner particles actually dispensed into the developer housing fluctuates around the average value set by the control system. More importantly, many machine configurations necessitate a transport channel design which prevents toner particles from falling freely into the developer housing whereby toner particles collect in the transport channel, causing a buildup of toner particles within the channel and blocking the flow of toner particles from the dispenser housing to the developer housing.

Figures 1 and 2 illustrate a typical toner dispenser transport channel wherein toner particles 8 are transported through a substantially horizontal conduit via a rotating auger 6 for transporting the toner particles in the direction of arrow 10. After the to...