Browse Prior Art Database

MAGNETIC TRANSPORT UTILIZING GHOST POLE MAGNETICS

IP.com Disclosure Number: IPCOM000026096D
Original Publication Date: 1990-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 86K

Publishing Venue

Xerox Disclosure Journal

Abstract

In typical two component development housings, magnetic fields are used to pick up developer material from some sort of mixing element (typically an auger), hold it (the developer material) onto a rotating shell so that it can be transported into a trimming region, after which it may be introduced into the development nip, and subsequently returned to the mixing element. If an insufficient quantity of developer is ultimately conveyed to the development region, either because the pickup magnetic field and/or the transport magnetic field(s) are too weak, catastrophic copy quality degradation results. However, if too much material is picked up and transported into the trim region, excessive torque and premature developer failure can result. Thus, it is good design practice to use a strong pickup magnetic field followed by transport magnetic field(s) which drop excess material before it is lifted into the trim region. This disclosure illustrates a simple and effective way to design such a system.

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XEROX DISCLOSURE JOURNAL

MAGNETIC TRANSPORT UTIL- Proposed Classification IZING GHOST POLE MAGNETICS
Steven C. Hart
Cyril
G. Edmunds

U.S. C1.355/251 Int. C1. G03g 15/09

Conven tiona I Magnetics Ghost Pole Magnetics

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 2 MarcWApril 1990 91

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MAGNETIC TRANSPORT UTILIZING GHOST POLE MAGNETICS

(Cont'd)

In typical two component development housings, magnetic fields are used to pick up developer material from some sort of mixing element (typically an auger), hold it (the developer material) onto a rotating shell so that it can be transported into a trimming region, after which it may be introduced into the development nip, and subsequently returned to the mixing element. If an insufficient quantity of developer is ultimately conveyed to the development region, either because the pickup magnetic field and/or the transport magnetic field(s) are too weak, catastrophic copy quality degradation results. However, if too much material is picked up and transported into the trim region, excessive torque and premature developer failure can result. Thus, it is good design practice to use a strong pickup magnetic field followed by transport magnetic field(s) which drop excess material before it is lifted into the trim region. This disclosure illustrates a simple and effective way to design such a system.

As shown in the following figure, (Conventional Magnetics) the transport mag...