Magnetic brush development apparatus having a gating and meterin

Details Magnetic brush development apparatus having a gating and meterin Magnetic brush development apparatus having a gating and meterin

1986-12-22

1987-09-01

Pianalto, Bernard D.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

118658, 118669, 118672, G03G 1509

Patent

active

046900969

ABSTRACT:
In electrographic apparatus a magnetic brush development station has a housing with a sump for holding a supply of developer material, and a magnetic brush that applies developer material from the sump to a latent image on a photoconductor. A rotatable transport roller is located between the sump and the magnetic brush. A magnet in the roller attracts developer material from the sump to the roller so that rotation of the roller can move the material toward the magnetic brush. A gating and metering member in the form of a cylindrical tube is positioned around the roller and spaced from it. The tube has two elongate, spaced slots, and the tube is rotatable between first and second positions. When the tube is in one of its positions developer material from the sump can pass through one of the slots to the roller and be transported to the other slot where it is metered to the magnetic brush. When the tube is in its second position the slots are offset from the sump and the brush to block the flow of developer material to the transport roller and to the magnetic brush.

REFERENCES:
patent: 3523518 (1970-08-01), Sage et al.
patent: 3575139 (1971-04-01), Nuzum
patent: 3640248 (1972-02-01), Nielander
patent: 3908596 (1975-09-01), Smith
patent: 4391503 (1983-07-01), Pugh
patent: 4422405 (1983-12-01), Kasahara et al.
patent: 4452173 (1984-06-01), Tabuchi et al.
patent: 4538896 (1985-09-01), Tajima et al.
patent: 4583832 (1986-04-01), Kasamura et al.

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