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Magnetic Field Control for Magnetic Brush Developer

IP.com Disclosure Number: IPCOM000082843D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Ellis, RE: AUTHOR

Abstract

A uniform magnetic field is generated across the length of a magnetic brush developer unit by utilizing properly placed pole pieces.

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Magnetic Field Control for Magnetic Brush Developer

A uniform magnetic field is generated across the length of a magnetic brush developer unit by utilizing properly placed pole pieces.

Magnet groups 11, 13 and 15 are placed upon an aluminum core 17 in the configuration of Fig. 1 to generate a magnetic field thereabout, useful in controlling the developer mix located on a cylindrical roll placed over the magnet configuration. Each magnet group comprises a plurality of permanent magnets which, for example, can be high-strength Alnico VIII. These magnets are placed in end-to-end relation as shown in Fig. 2 to obtain the desired length.

In order to prevent variations in the magnetic field intensity which are particularly noted at the junction points between adjacent magnets, a thin (0.010 inch thick) soft steel strip 19 is overlaid directly and centrally on one (or both) pole faces, and extends the full length of the magnet row. The strip 19 is permanently held in place with epoxy cement. The placement of the strip 19 further increases the field strength along the row by up to 6% above its former value.

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