Anti-gravitational cascade development for electrostatic process

Details Anti-gravitational cascade development for electrostatic process Anti-gravitational cascade development for electrostatic process

1974-12-12

1977-04-05

Stein, Mervin

Coating apparatus

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

With electromagnetic and/or electrostatic removal of...

427 18, 118657, G03G 1309

Patent

active

040155617

ABSTRACT:
Latent electrostatic images carried by a photoconductively coated substrate of an electrostatic processor are developed in a magnetic field free development zone by a multicomponent developer. The developer circulates in a path which runs from a lower level of a sump, upwardly through the development zone, and then back to the sump. To that end, there are means below the development zone for propelling the developer upwardly into and through that zone, together with means above the development zone for capturing the excess developer (i.e., the developer not consumed in the development process) emerging from that zone. In one embodiment, there are separate magnetic transport rolls for propelling the developer into the development zone and for recapturing the excess developer. To accomodate that embodiment, a developer containing ferromagnetic carrier particles and toner particles is used. That embodiment may be enhanced by employing a development electrode to improve the solid area coverage, and that electrode may be appropriately biased to hold background development at an acceptable low level.

REFERENCES:
patent: 3157546 (1964-11-01), Couer
patent: 3641980 (1972-02-01), Bickmore
patent: 3685486 (1972-08-01), Donalies
patent: 3707947 (1973-01-01), Reichart, Jr.
patent: 3752119 (1973-08-01), Matkan
patent: 3826672 (1974-07-01), Cantarano
patent: 3835811 (1974-09-01), Eto
patent: 3900001 (1975-08-01), Fraser et al.

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