Printing apparatus with toner projection means

Details Printing apparatus with toner projection means Printing apparatus with toner projection means

1993-11-01

1995-09-26

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

355262, 355265, 355246, G01D 1516, G03G 1506

Patent

active

054537681

ABSTRACT:
A direct electrostatic printing process which is insensitive to the polarity of the toner material is disclosed. The donor member of the printing apparatus includes alternate narrow and wide electrodes. The narrow electrodes are electrically pulsed to eject toner of one polarity in proximity with an array of electrically controlled apertures in a printhead, and unused toner are returned to the donor surface with low momentum to avoid dislodgment of other toner from the donor on impact. Toner ejection is accomplished with a three segment voltage pulse, including an impulse segment to detach toner of one polarity from the donor and accelerate the toner particles toward a printhead, a zero voltage segment during which the ejected toner drifts in the presence of electric fields produced by voltages applied to the printhead and toner receiving member, and a final low voltage segment of the same polarity as the first impulse segment to decelerate toner returning to the donor to a low landing speed and thereby avoid dislodgement of other toner from the donor. The donor structure and ejector pulse renders aperture type direct printing stable for long periods of time without frequent cleaning of the printhead.

REFERENCES:
patent: 3689935 (1972-09-01), Pressman et al.
patent: 3914771 (1975-10-01), Lunde et al.
patent: 4164372 (1979-08-01), Gundlach et al.
patent: 4282303 (1981-08-01), Bergen
patent: 4291643 (1981-09-01), Kobayashi et al.
patent: 4568955 (1986-02-01), Hosoya et al.
patent: 4994859 (1991-02-01), Mizuno et al.
patent: 5175070 (1992-12-01), Tanikawa et al.

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