Roll seal blade support for a xerographic development unit using

Details Roll seal blade support for a xerographic development unit using Roll seal blade support for a xerographic development unit using

1997-02-10

1998-04-21

Smith, Matthew S.

Electrophotography

Internal machine environment

Particle or contaminant control

G03G 1508

Patent

active

057428751

ABSTRACT:
In a xerographic development unit, particularly a unit for applying single-component magnetic toner such as used in MICR printing, the end of a donor roll which applies toner to the surface of a charge receptor is provided with a magnetic seal. The magnetic seal extends around at least a portion of the circumference of the roll, and defines a set of alternating magnetic poles arranged in bands which alternate along the length of the roll. The magnetic seal forms a uniform gap relative to the surface of the roll, the gap being sufficiently large to allow a turnover of toner particles therethrough. The design minimizes mechanical stresses on the toner, which in turn avoids the generation of frictional heat in the toner. A member defining magnetic poles can also be used as a shim for mounting a charge/metering blade within the development unit.

REFERENCES:
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patent: 5084733 (1992-01-01), Katoh et al.
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patent: 5187326 (1993-02-01), Shirai
patent: 5287148 (1994-02-01), Sakemi et al.
patent: 5450169 (1995-09-01), Hart et al.
patent: 5563689 (1996-10-01), Tompkins et al.

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