Direct electrostatic printing apparatus and toner/developer deli

Details Direct electrostatic printing apparatus and toner/developer deli Direct electrostatic printing apparatus and toner/developer deli

1986-11-03

1989-03-21

Evans, Arthur G.

Recorders

Electric recording

Electrochemical

3461601, G01D 1500

Patent

active

048147966

ABSTRACT:
Direct electrostatic printing apparatus including structure for delivering developer or toner particles to a printhead forming an integral part of the printing device. The printing device includes, in addition to the printhead, a conductive shoe which is suitably biased during a printing cycle to assist in the electrostatic attraction of developer through apertures in the printhead onto the copying medium disposed intermediate the printhead and the conductive shoe. The structure for delivering developer or toner is adapted to deliver toner containing a minimum quantity of wrong sign and size toner. To this end, the developer delivery system includes a conventional magnetic brush which delivers toner to a donor roll structure which, in turn, delivers toner to the vicinity of apertures in the printhead structure.

REFERENCES:
patent: 3689935 (1972-09-01), Pressman et al.
patent: 4491855 (1985-01-01), Fujii et al.
patent: 4568955 (1986-02-01), Hosoya et al.
patent: 4615606 (1986-10-01), Nishikawa
USSN 718,615, "Development Apparatus"; Ying Wei Lin.

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