Toner applicator for electrostatic copier

Details Toner applicator for electrostatic copier Toner applicator for electrostatic copier

G - Physics

03

G

32/12

G03G 15/08 (2006.01)

Patent

CA 1084697

TONER APPLICATOR FOR ELECTROSTATIC COPIER ABSTRACT OF THE DISCLOSURE An applicator for depositing toner particles-onto an electrostatically-charged latent image formed on a photo- conductive 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. -1-

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