Resonant purging of drop-on-demand ink jet print heads

Details Resonant purging of drop-on-demand ink jet print heads Resonant purging of drop-on-demand ink jet print heads

1980-08-01

1982-04-06

Miller, Jr., George H.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346 11, G01D 1518

Patent

active

043239080

ABSTRACT:
The object of this invention is to purge any entrapped air from the ink cavity (17) and nozzle orifice (15) of the print head (10) of a drop-on-demand ink jet printer. Purging is accomplished automatically as a part of the start up operation and also if, during operation, the velocity V.sub.s of the ink droplets (26), as sensed by a sensor (41), drops below a preselected reference value V.sub.r.
The print head comprises a tubular piezoelectric transducer (11). The transducer is energized with a series of pulses for a preselected short time period and at a repetition rate substantially equal to a resonant frequency of the ink cavity. This effectively purges any entrapped air from the ink system. Except during purging, the transducer operates asynchronously in drop-on-demand mode in response to discrete binary print signals.

REFERENCES:
patent: 2512743 (1950-06-01), Hansell
patent: 3661304 (1972-05-01), Martinez et al.
patent: 3852768 (1974-12-01), Carmichael et al.
patent: 4034380 (1977-07-01), Isayama
patent: 4123761 (1978-10-01), Kimura et al.
patent: 4170016 (1979-10-01), Geil
patent: 4176363 (1979-11-01), Kasahara
Titcomb, S. C., Ink Jet Start-Up and Shutdown, IBM Technical Disclosure Bulletin, Nov. 1975, vol. 18, No. 6, pp. 1984-1985.
Chaudhary, K. C., Controlling Drop Velocity and/or Drop Size In An Ink Jet, IBM Technical Disclosure Bulletin, Aug. 1978, vol. 21, No. 3, pp. 1212-1213.

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