Magnetic sleeve for non-interactive agitated magnetic brush deve

Details Magnetic sleeve for non-interactive agitated magnetic brush deve Magnetic sleeve for non-interactive agitated magnetic brush deve

1998-12-22

2000-01-25

Royer, William

Electrophotography

Image formation

Development

399276, G03G 1509

Patent

active

060186399

ABSTRACT:
A development system is disclosed including a developer roll adapted for depositing developer material on an imaging surface having an electrostatic latent image thereon. The development system which includes a developer roll with a magnetic sleeve having a static magnetic field pattern for transporting developer material to a development zone. In operation the stationary magnetically patterned sleeve holds a thin well-defined blanket of magnetic developer on the sleeve surface. Magnetic assembly rotates and thereby generating a tangential magnetic field to move the developer blanket along the surface of sleeve; The developer blanket passes over zones on sleeve where developer material is picked up, self metering, mixing, blanket homoginization, tribo charging and developer transport occurs. The developer blanket moves to the development zone which is defined by a planar portion on the sleeve; parallel and adjacent to the imaging surface whereupon the blanket is compressed. Agitation generated by the rotating magnetic assembly dislodges toner particles from the carrier beads and an AC field is applied to the sleeve to aid in the formation of a toner cloud in the development zone for transporting toner to the imaging surface by the development fields.

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patent: 5227848 (1993-07-01), Robinson et al.
patent: 5826151 (1998-10-01), Genovese

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