Browse Prior Art Database

EXTRUDED PLASTIC CORE DISCRETE MAGNETIC ROLLS

IP.com Disclosure Number: IPCOM000026049D
Original Publication Date: 1989-Dec-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

The magnets for a magnetic brush used to apply toner to a photoreceptor surface carrying an electrostatic latent image, are in the form of strips of magnetic material formed separately from a holder for them. In order to arrive at the desired magnetic polar diagram for the magnetic brush, the magnets need to be of different strengths and to be positioned around the periphery of the holder. The different strengths are obtained by using bars of magnetic material of different cross-sectional areas.

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EROX DISCLOSURE JOURNAL

I

EXTRUDED PLASTIC CORE Proposed Classification DISCRETE MAGNETIC ROLLS U.S. C1.355/245
A.
R. Delhomme Int. C1. G03g 15/06

2

Volume 14 Number 6 November/December 1989 301

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EXTRUDED PLASTIC CORE DISCRETE MAGNETIC ROLLS (Cont'd)

The magnets for a magnetic brush used to apply toner to a photoreceptor surface carrying an electrostatic latent image, are in the form of strips of magnetic material formed separately from a holder for them. In order to arrive at the desired magnetic polar diagram for the magnetic brush, the magnets need to be of different strengths and to be positioned around the periphery of the holder. The different strengths are obtained by using bars of magnetic material of different cross-sectional areas.

As shown in the drawings, the angular disposition of the strips (bars) 2 of magnetic material, such as of ferrite material in a plastics matrix, is controlled by extruding the holder 4 from plastics material or non-magnetic metal. The holder has parallel-sided longitudinal recesses 6 formed in its outer surface, the shape of each recess being a close fit on its respective magnetic strip. To fix the radial position of each strip, the opposing walls of each recess 6 may be provided with longitudinal ribs 8, and the strips with complementary recesses 10. Either the walls of the recesses, or the material of the strips, or both, is sufficiently resilient to allow t...