Electrostatic printing apparatus comprising improved printing el

Details Electrostatic printing apparatus comprising improved printing el Electrostatic printing apparatus comprising improved printing el

1976-12-20

1978-10-03

Lucas, Jay P.

Recorders

Electric recording

Electrochemical

118647, 346155, 355 3DD, G03G 1508

Patent

active

041187105

ABSTRACT:
Liquid or dry developing substance comprising charged particles is applied to a base electrode in the form of a rotary cylinder. A sheet of recording paper is fed in contact with the cylinder. A printing head comprises at least one bias electrode to which is applied a bias voltage of a polarity to repel the charged particles against the cylinder. At least one shaping electrode which extends closer to the recording sheet than the bias electrode is selectively applied with a voltage of a polarity and magnitude to overcome the bias voltage and attract only the charged particles immediately adjacent to the shaping electrode to the recording sheet for printing.

REFERENCES:
patent: 2918580 (1959-12-01), Howell
patent: 3428025 (1969-02-01), Sullivan
patent: 3611419 (1971-10-01), Blumenthal
patent: 3618118 (1971-11-01), Lloyd
patent: 3638610 (1972-02-01), Lyles
patent: 3981268 (1976-09-01), Tsukamoto

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