Toner applicator for electrostatic copier

Details Toner applicator for electrostatic copier Toner applicator for electrostatic copier

1976-11-10

1980-11-11

Feldbaum, Ronald

Coating apparatus

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

With electromagnetic and/or electrostatic removal of...

G03G 1508

Patent

active

042326281

ABSTRACT:
An applicator for depositing toner particles onto an electrostatically-charged latent image formed on a photoconductive insulating layer to render visible and develop this image. The applicator includes a trough containing a supply of toner and provided with a flexible blade of dielectric material which engages the surface of a rotating carrier roll to form a tight nip. As the roll turns, toner particles at the bottom of the trough are advanced toward the blade and forced through the nip, the blade being deflected to admit a thin layer of particles which adhere to the roller surface. In the course of such passage, the particles are frictionally rubbed by the edge of the blade and thereby caused to assume a triboelectric charge. A paper web or other medium carrying an electrostatically-charged latent image of the intelligence to be copied is transported so as to engage the toner layer carried on the surface of the roll, whereby charged toner particles are transferred to the medium and deposited on the latent image to produce a developed image for subsequent fixing.

REFERENCES:
patent: 504718 (1893-09-01), Franke
patent: 2620767 (1952-12-01), Lehman
patent: 2787244 (1957-04-01), Hickin
patent: 3198648 (1965-08-01), Trimbur
patent: 3340849 (1967-09-01), Adams et al.
patent: 3566786 (1971-03-01), Kaufer et al.
patent: 3621816 (1971-11-01), Donalies
patent: 3762365 (1973-10-01), Herzog

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