Method and apparatus for liquid-developing latent electrostatic

Details Method and apparatus for liquid-developing latent electrostatic Method and apparatus for liquid-developing latent electrostatic

1979-12-19

1982-04-20

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118651, 118661, 430118, 430119, G03G 1510

Patent

active

043256279

ABSTRACT:
In an electrostatic copier having an applicator electrode positioned closely adjacent but not touching the photoconductive surface on which there is a latent electrostatic image to be developed. The surface of the latent image and the surface of the applicator electrode move at the same speed, or the electrode may move at a greater speed. The electrode and the photoconductor are spaced from each other by a gap in the order of between three and six mils. The applicator roller is mounted with its lower segment immersed in a tank containing a developing liquid bearing charged toner particles. There is a mechanism for increasing the liquid to the gap, such as a drive for speeding the rotary electrode to more than the photoconductor speed. After the latent image has been developed, a metering roller, which is a roller whose surface moves in the direction opposite to the surface of the photoconductor, meters or dynamically removes a portion of the liquid from the developed image. The freshly developed image is then transferred to a carrier sheet. An arcuate field electrode is positioned between the metering station and the transferring station. The field electrode is biased to a potential of a sign opposite to the charge of the toner particles.

REFERENCES:
patent: 3870514 (1975-03-01), Sato et al.
patent: 3907423 (1975-09-01), Hayashi et al.
patent: 4052959 (1977-10-01), Hayashi et al.
patent: 4168119 (1979-09-01), Nishimura et al.
patent: 4202913 (1980-05-01), Klavan et al.
patent: 4248522 (1981-02-01), Davis

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