Ink jet parallel cusp producing slot or edge configured nozzle s

Details Ink jet parallel cusp producing slot or edge configured nozzle s Ink jet parallel cusp producing slot or edge configured nozzle s

1989-09-27

1991-06-04

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 75, 361226, 361228, G01D 1518, H05B 300

Patent

active

050218034

ABSTRACT:
A multi-jet print head for a continuous ink jet printer has its individual ink jets formed electrostatically instead of using a row of individual nozzles. Ink is supplied continuously through a slot in an electrically conducting body or to an elongated edge portion of such a body, while a strong electrostatic field is applied to draw off the ink as an array of parallel cusps. These break up at their tips to form a stream of ink drops which can then be deflected in known manner. The electrostatic field preferably has a reinforcing secondary field superimposed on it, which is cyclically varied at a suitable ink drop production frequency to synchronize formation of the ink drops at each of the cusp tips. This enables means for deflecting the drops to be synchronized with the moving drops for consistent deflections and corresponding optimum resolution. The use of a slot or edge portion reduces problems of nozzle clogging inherent in multi-nozzle arrays and the continuous ink flow provides uniform printing conditions along the length of the print head.

REFERENCES:
patent: 3060429 (1962-10-01), Winston
patent: 3484794 (1969-12-01), Winston
patent: 3656171 (1972-04-01), Robertson
patent: 4326204 (1982-04-01), Erin
patent: 4356528 (1982-10-01), Coffee
patent: 4547785 (1985-10-01), Jones
patent: 4549243 (1985-10-01), Owen et al.

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