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DOUBLE SPIRAL MAGNET

IP.com Disclosure Number: IPCOM000024618D
Original Publication Date: 1981-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 43K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, a magnetic brush development system is frequently employed. The magnetic brush development system utilizes a rotating, non-magnetic tubular member having a magnetic member disposed interiorly thereof. It has been found that streaking of the developed electrostatic latent image may occur. To prevent the occurrence of streaking, the magnet has the pole pattern arranged thereon in a double spiral. This double spiral arrange-ment appears to uniformly charge the toner inductively for subsequent develop-ment and eliminates any mechanical flow blockages during the transporting of the toner particles. It is believed that the double helix design minimizes solid area streaks.

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~ XEROX DISCLOSURE JOURNAL

DOUBLE SPIRAL MAGNET
Proposed P.W. Burnham Classification

U.S. Cl. 118/657

Int. Cl. G03g 15/09

In an electrophotographic printing machine, a magnetic brush development system is frequently employed. The magnetic brush development system utilizes a rotating, non-magnetic tubular member having a magnetic member disposed interiorly thereof. It has been found that streaking of the developed electrostatic latent image may occur. To prevent the occurrence of streaking, the magnet has the pole pattern arranged thereon in a double spiral. This double spiral arrange- ment appears to uniformly charge the toner inductively for subsequent develop- ment and eliminates any mechanical flow blockages during the transporting of the toner particles. It is believed that the double helix design minimizes solid area streaks.

Volume 6 Number 3 May/June 1981 111

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112 XEROX DISCLOSURE JOURNAL

Volume 6 Number 3 May/June 1981

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