Printing apparatus and toner/developer delivery system therefor

Details Printing apparatus and toner/developer delivery system therefor Printing apparatus and toner/developer delivery system therefor

1988-05-31

1989-10-24

Evans, Arthur G.

Recorders

Electric recording

Electrochemical

3461531, G01D 1500

Patent

active

048765619

ABSTRACT:
Direct electrostatic printing (DEP) is optimized by presenting well charged toner to a charged toner conveyor which conveys the toner to an apertured printhead structure for propulsion therethrough. The charged toner conveyor comprises a plurality of electrodes wherein the electrode density (i.e. over 400 electrodes per inch) is relatively large for enabling a high toner delivery rate without risk of air breakdown. The printhead structure is constructed for minimization of aperture clogging. To this end the thickness of the printhead structure is about 0.025 mm and the aperture diameter (i.e. 0.15 mm) is large compared to the printhead thickness.

REFERENCES:
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patent: 3801869 (1974-04-01), Masuda
patent: 3872361 (1975-03-01), Masuda
patent: 4491855 (1985-01-01), Fujii et al.
patent: 4515882 (1985-05-01), Mammino et al.
patent: 4562447 (1985-12-01), Takumi
patent: 4568955 (1986-02-01), Hosoya et al.
patent: 4647179 (1987-03-01), Schmidlin

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