Direct electrostatic printing apparatus and printhead cleaning s

Details Direct electrostatic printing apparatus and printhead cleaning s Direct electrostatic printing apparatus and printhead cleaning s

1986-11-03

1988-07-05

Evans, Arthur G.

Recorders

Electric recording

Electrochemical

3461601, G01D 1506

Patent

active

047558377

ABSTRACT:
Direct Electrostatic Printing apparatus including structure for removing wrong sign developer particles from a printhead forming an 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 passing through apertures in the printhead onto the copying medium disposed intermediate the printhead and the conductive shoe. During a cleaning cycle, the printing bias is removed from the shoe and an electrical bias suitable for creating an oscillating electrostatic field which effects removal of toner from the printhead is applied to the shoe.

REFERENCES:
patent: 3689935 (1972-09-01), Pressman et al.
patent: 4478510 (1984-10-01), Fujii et al.
patent: 4491855 (1985-01-01), Fujii et al.
patent: 4521098 (1985-01-01), Hosoya et al.
patent: 4538163 (1987-08-01), Sheridon
patent: 4568955 (1986-02-01), Hosoya et al.
U.S.S.N. 718,615, "Development Apparatus", Ying-wei Lin.

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