Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1974-12-16
1976-08-10
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
G01D 1518
Patent
active
039745082
ABSTRACT:
Pulsed droplet ejecting systems are described of the type in which a conduit conducts liquid from a reservoir to an orifice. The liquid is under zero or slightly negative pressure, and surface tension in the orifice prevents flow in the absence of other forces. An electroacoustic transducer is coupled to the liquid and when an electric pulse is applied a pressure wave travels in the liquid to the orifice causing ejection of a droplet of liquid. Systems of this type work well only when free of entrapped air, a condition difficult to achieve in prior art designs. Means are disclosed for readily and reliably filling such systems without entrapment of air pockets. A second conduit is permanently or temporarily joined to the first conduit adjacent to or in place of the orifice, and means are provided for temporarily causing rapid flow of liquid from the reservoir through the first conduit into and through the second conduit. The conduits have sufficiently large cross sections so that the flow can be fast enough to sweep out all air pockets that might otherwise remain if flow during filling the system were through a single conduit and out a typical small orifice.
REFERENCES:
patent: 3108673 (1963-10-01), Green
patent: 3683212 (1972-08-01), Zoltan
patent: 3832579 (1974-08-01), Arndt
Leslie et al., Reaming and Plugging Ink Jet Nozzles; IBM Tech. Disc. Bulletins, vol. 16, No. 3, Aug. 1973, p. 879.
Helinski, E. F.; Start Up-Turn Off System For Ink Jet Printer, IBM Tech. Disc. Bulletin, vol. 17, No. 2, July 1974. pp. 370-371.
Gould Inc.
Hartary Joseph W.
Hyde Eber J.
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