Original Publication Date: 1989-Dec-31
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
Multi-polar magnets, such as are used for magnetic toner brushes for use in xerography, usual1 have several pole pieces an larly spaced around the asymmetric pole pattern entails the ole pieces being of different strengths.
XEROX DISCLOSURE JOURNAL
Proposed A. R. Delhomme Classification
U.S. C1.355/251 Int. C1. G03g 15/02
Multi-polar magnets, such as are used for magnetic toner brushes for use in xerography, usual1 have several pole pieces an larly spaced around the
asymmetric pole pattern entails the ole pieces being of different strengths.
windings. One winding is intended to have a high current passed through it while it is retained in a fixture. This saturates the permanent magnet material of the pole piece. The other winding has fewer turns, or is supplied with a lower demagnetizing current, or both, to reduce the flux density of the pole piece to its design value while the pole piece remains in the fixture.
periphery of a ho ly der presenting a cylindrica
Renvelope. The desired
This is achieved by wrapping each o F some or all of the pole pieces with two
Volume 14 Number 6 November/December 1989 309
MULTI-POLE MAGNETS (Cont'd)
Prior to the magnetizing step, the windings may be secured permanently to the pole piece by being potted in an epoxy or other resin.
In the drawing, the pole piece 2 is in the shape of a short flat bar with rounded ends. Wrapped tightly around the upper (as viewed) part of the pole piece is a magnetizing winding 4, made of insulated wire having bared ends to permit the winding to be connected to a DC source of magnetizing current. Positioned closely adjacent to winding...