Browse Prior Art Database

SELF-CLEANING ELECTROMAGNETIC DEVICES FOR ELECTROSTATIC COPYING MACHINES

IP.com Disclosure Number: IPCOM000023896D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 372K

Publishing Venue

Xerox Disclosure Journal

Abstract

Prior art developer housing seals and magnetic devices for capturing magnetically attractable material are generally directed to magnetic members which are per-manent magnets. Such a magnetic device is described in U.S. Patent 3,906,899 where magnetically attractable material is captured between two parallel spaced, thin magnetic pole edges which form a U-shaped member to contain captured magnetic material. The prior art further describes spaced apart permanent magnets to attract magnetically attractable particles which have accumulated upon the photoreceptor. These prior art systems are disadvantageous because the magnetically attractable particles are permanently attracted to the magnets making it difficult to clean accumulated magnetic particles therefrom.

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XEROX DISCLOSURE JOURNAL

SELF-CLEANING ELECTROMAGNETIC ~DEVIcES FOR

STATIC COPY ING M ACHINES
F. Chapman

Proposed Classification
U.S. CL 118/658

mt. CL G03g 15/09

Prior art developer housing seals and magnetic devices for capturing magnetically attractable material are generally directed to magnetic members which are per- manent magnets. Such a magnetic device is described in U.S. Patent 3,906,899 where magnetically attractable material is captured between two parallel spaced, thin magnetic pole edges which form a U-shaped member to contain captured magnetic material. The prior art further describes spaced apart permanent magnets to attract magnetically attractable particles which have accumulated upon the photoreceptor. These prior art systems are disadvantageous because the magnetically attractable particles are permanently attracted to the magnets making it difficult to clean accumulated magnetic particles therefrom.

The present disclosure is directed to spaced apart electromagnets having a recess or channel therebetween with no connecting member or U-shaped structure there- between for removing captured magnetic material from the photoreceptor. The electromagnets permit periodic energization and de-energization as desired to permit the automatic removal of accumulated magnetic material captured from the surface of the photoreceptor. As the electromagnet is de-energized, the captured magnetic material is easily removed by gravity or by other means and may be per...