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LOW POWER MEANS FOR DE-GAUSSING MAGNETIC DEVELOPER

IP.com Disclosure Number: IPCOM000023674D
Original Publication Date: 1978-Oct-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 206K

Publishing Venue

Xerox Disclosure Journal

Abstract

A problem in magnetic developer systems is the magnetic carrier's remanence which causes the developer to coalesce or coagulate leading to diminished flow or complete blockage. De-gaussing can remove this magnetic remanence and restore the developer's original flow characteristics. A proposed de-gaussing method is shown in the figure. The developer is made to flow inside a solenoid coil or series of coils powered by a charged capacitor. By intermittently pulsing the coil, a developer is subjected to a series of rapid, decaying field reversals, effectively de-gaussing the material. The circuit response is determined by the choice of coil inductance and resistance and value of the capacitor. With the proposed circuit, the average power expended will be low and the coil heating a minimum. If the coil is used with a large-size wire or ribbon to keep the coil resistance small, then most of the power can be dissipated in an external resistance.

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XEROX DISCLOSURE JOURNAL

LOW POWER MEANS FOR DE-GAUSSING MAGNETIC DEVELOPER
Steve Ewa
D. G. Parker

Proposed Classification
U.S. Cl. 118/657 tnt. Cl. G03g 15/09

A problem in magnetic developer systems is the magnetic carrier's remanence which causes the developer to coalesce or coagulate leading to diminished flow or complete blockage. De-gaussing can remove this magnetic remanence and restore the developer's original flow characteristics. A proposed de- gaussing method is shown in the figure. The developer is made to flow inside a solenoid coil or series of coils powered by a charged capacitor. By intermittently pulsing the coil, a developer is subjected to a series of rapid, decaying field reversals, effectively de-gaussing the material. The circuit response is determined by the choice of coil inductance and resistance and value of the capacitor. With the proposed circuit, the average power expended will be low and the coil heating a minimum. If the coil is used with a large-size wire or ribbon to keep the coil resistance small, then most of the power can be dissipated in an external resistance.

SOLENOID

Volume 3 Number 5 September/October 1978 301

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                   XEROX DISCLOSURE JOURNAL
302
Volume 3 Number 5 September/October 1978

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