Wrong sign toner extraction for a direct electrostatic printer

Details Wrong sign toner extraction for a direct electrostatic printer Wrong sign toner extraction for a direct electrostatic printer

1989-08-28

1990-02-20

Evans, Arthur G.

Recorders

Electric recording

Electrochemical

346155, G01D 1500

Patent

active

049030493

ABSTRACT:
Direct electrostatic printing (DEP) is enhanced by the provision of wrong-sign toner extraction holes or apertures provided in a printhead structure at a location which is upstream of the printing apertures. Wrong sign toner particles are extracted from a cloud of toner provided from a toner delivery device. The wrong sign toner is extracted from the powder cloud before the cloud reaches the vicinity of the printing apertures thereby minimizing print hole blockage.

REFERENCES:
patent: 3689935 (1972-09-01), Pressman et al.
patent: 4491855 (1985-01-01), Fuji et al.
patent: 4568955 (1986-02-01), Hosoya et al.
patent: 4743926 (1988-05-01), Schmidlin et al.
patent: 4755837 (1988-07-01), Schmidlin et al.
patent: 4799070 (1989-01-01), Nishikawa
patent: 4814796 (1989-03-01), Schmidlin

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