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Browse Prior Art Database

IMPROVED DEVELOPER TRIM

IP.com Disclosure Number: IPCOM000027221D
Original Publication Date: 1995-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 100K

Publishing Venue

Xerox Disclosure Journal

Abstract

FIG. 1 illustrates a schematic diagram of a developing apparatus 10 for a two-component developer for a xerographic machine. Neutral toner is dispensed by a toner dispenser 12 into a developer sump 14 wherein the neutral toner is mixed with a carrier. When the toner and carrier come into contact, typically, the carrier takes on a positive charge and the toner takes on a negative charge, thereby causing the toner and the carrier to combine into a developer. The toner and the carrier are constantly mixed by a mixing wheel 16 or some other mechanical apparatus. Once mixed, the developer is attracted to a developer roll 18 which rotates in the direction of an arrow 20. The developer roll 18 includes a plurality of magnets 22 which create the attractive forces necessary to carry the developer to a photoreceptor 24 travelling in the direction of an arrow 26. The developer is metered onto the developer roll 18 by a metering blade 28 which creates a gap 30 with the developer roll 18. The gap 30 between the metering blade 28 and the developer roll 18 deposits a very thin layer of developer onto the developer roll 18. Because this thin layer is difficult to maintain, many streaking failures occur when unwanted material wedges between the trim blade 28 and the developer roll 18.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

IMPROVED DEVELOPER TRIM

Classification Proposed John F. Knapp U.S. C1.355/259

Int. C1. G03g 15/06

LEGEND

Positive Carrier Neutral Toner Negative Toner Developer

XEROX DISCLOSURE JOURNAL Vol. 20 No. 5 September/October 1995 443

[This page contains 1 picture or other non-text object]

Page 2 of 2

IMPROVED DEVELOPER TRIM (Cont'd)

FIG. 1 illustrates a schematic diagram of a developing apparatus 10 for a two- component developer for a xerographic machine. Neutral toner is dispensed by a toner dispenser 12 into a developer sump 14 wherein the neutral toner is mixed with a carrier. When the toner and carrier come into contact, typically, the carrier takes on a positive charge and the toner takes on a negative charge, thereby causing the toner and the carrier to combine into a developer. The toner and the carrier are constantly mixed by a mixing wheel 16 or some other mechanical apparatus. Once mixed, the developer is attracted to a developer roll 18 which rotates in the direction of an arrow 20. The developer roll 18 includes a plurality of magnets 22 which create the attractive forces necessary to carry the developer to a photoreceptor 24 travelling in the direction of an arrow 26. The developer is metered onto the developer roll 18 by a metering blade 28 which creates a gap 30 with the developer roll 18. The gap 30 between the metering blade 28 and the developer roll 18 deposits a very thin layer of developer onto the developer roll 18. Because...