Liquid toner fountain for the development of electrostatic image

Details Liquid toner fountain for the development of electrostatic image Liquid toner fountain for the development of electrostatic image

1980-10-03

1983-08-16

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

134122P, 354317, 354324, G03G 1510

Patent

active

043988180

ABSTRACT:
The components of the apparatus include multiple distribution plates with lateral liquid distribution to produce smooth streamline flow, a slotted metalized plastic electrode, and a funnel-shaped understructure which drains excess toner liquid into a sump to recover developer and prevent evaporation. The apparatus provides a laminar liquid flow in the gap between the charge bearing surface and the development electrode to prevent disturbance of the already deposited toner; the flow rate is even along the length of the fountain thereby avoiding density gradients due to uneven flow rates; the developer fluid in the gap is maintained free of debris by draining all fluid into the sump when the pump is turned off; the developer electrode is shaped to minimize highly localized and non-uniform field strengths and a centrifugal type pump is utilized to prevent toner agglomeration.

REFERENCES:
patent: 3407786 (1968-10-01), Beyer et al.
patent: 3507252 (1970-04-01), Leedom
patent: 3712203 (1973-01-01), Kishi et al.
patent: 3831556 (1974-08-01), Sato et al.
patent: 3937177 (1976-02-01), Lloyd
patent: 4110029 (1978-08-01), Goshima et al.
patent: 4148274 (1979-04-01), Stievenart et al.
patent: 4157219 (1979-06-01), Ohta et al.
patent: 4198923 (1980-04-01), Blumenthal
patent: 4270859 (1981-06-01), Galbraith et al.

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