Method and apparatus for adjusting toner concentration of two-co

Details Method and apparatus for adjusting toner concentration of two-co Method and apparatus for adjusting toner concentration of two-co

1983-09-26

1986-03-18

Braun, Fred L.

Photocopying

Including fiber optics

118657, 118658, 355 14D, G03G 1509

Patent

active

045764654

ABSTRACT:
The toner concentration of a two-component type developer including a mixture of a magnetic carrier and an electroscopic toner is adjusted by bringing a magnetic brush of the two-component type developer into sliding contact with a mesh screen to move the electroscopic toner toward the magnetic brush side or the opposite side through apertures of the mesh screen. Apparatus for adjusting the toner concentration in a two-component type developer includes a mechanism for forming a magnetic brush from a mixture of a magnetic carrier and an electroscopic toner and for delivering the magnetic brush. The mechanism includes a support formed of an electroconductive non-magnetic material and a magnet having a plurality of poles and being built in the interior of the support. At least one of the support and magnet is movable. A mesh screen is formed of an electroconductive material and is arranged to support the electroscopic toner on the upper surface side thereof and to have sliding contact with the magnetic brush on the lower surface side thereof. A bias voltage applying mechanism is provided for applying a bias voltage between the support and mesh screen.

REFERENCES:
patent: 3453045 (1969-07-01), Fantuzzo
patent: 3542466 (1970-11-01), Fox et al.
patent: 3790397 (1974-02-01), Weiler
patent: 4054381 (1977-10-01), Bernhard
patent: 4113371 (1978-09-01), Fraser et al.

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