Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1976-10-12
1978-08-01
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
137823, G01D 1518
Patent
active
041046455
ABSTRACT:
Several coincidence ink jet array systems are provided wherein each ink jet has two inlet passages communicated to an outlet orifice. An ink droplet is expressed from the orifice only when pressure pulses applied to the inlet passages coincide at the orifice.
In one system, each inlet passage of a jet is communicated to a respective transducer and each transducer is connected to a respective electronic driver. In this system, the number of electronic drivers and transducer chambers are substantially less than the number of ink jets. These transducer chambers are time shared for expressing an ink droplet. Actuation of the two transducer chambers communicated to a particular jet, in such a manner that the pressure pulses generated by the respective transducers coincide at the orifice, will effect expression of a droplet therefrom.
In another system, a master transducer chamber is communicated to one inlet passage of each jet. The other inlet of each jet is communicated to a separate respective droplet expression transducer chamber and each droplet expression transducer chamber is connected to a respective electronic driver. In this system, the master transducer chamber is actuated to create at each orifice a pressure pulse which is below the threshold pressure pulse for expressing an ink droplet therefrom. Actuation of any of the droplet expression transducer chambers to generate a pressure pulse which coincides at a particular orifice with the pressure pulse generated by the master transducer, will bring the resultant pressure pulse at the orifice above threshold to effect expression of the droplet from a particular orifice. The droplet expression transducer chambers are not time shared which permits a higher ink expression frequency than in the previous system. The use of a master transducer chamber permits a reduction in total area occupied by the transducers for each jet, permitting closer packing of transducer chambers with a resulting denser array of jets than if the coincidence jet principle were not employed.
REFERENCES:
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patent: 3152858 (1964-10-01), Wadey
patent: 3190554 (1965-06-01), Gehring
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patent: 3493004 (1970-02-01), Hellbaom
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patent: 3747120 (1973-07-01), Stemme
patent: 3848118 (1974-11-01), Rittberg
patent: 3848258 (1974-11-01), Mahoney
Magill et al., Printer-Recorder, IBM Tech. Disc. Bulletin, vol. 13, No. 9, Feb. 1971, pp. 2703-2704.
Hartary Joseph W.
Xerox Corporation
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