Ink dot printer

Details Ink dot printer Ink dot printer

1984-10-26

1986-07-29

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

400124, G01D 1516, B41J 312

Patent

active

046033386

ABSTRACT:
The present invention provides an ink dot printer wherein an electrostatic field is produced between ends of needles and an electrode, and the needles are selectively actuated to cause ink sticking to the ends of the needles to fly with a Coulomb force thereby to form dots with ink thus flown on record paper which covers the electrode without contacting the needles with the record paper. By this construction, noises are signficantly reduced and the ends of the needles are not damaged while printing results of a high resolution can be obtained. In addition, a tapered configuration of the ends of the needles will facilitate separation of the ink from the needles, assuring the uniformity of dots in shape and size. In case a positive voltage is applied to the electrode while the needles are grounded, treatment for insulation can be performed easily, allowing production of printing heads with ease and at a reduced cost. Besides, in case a bimorph is employed for a driving source for a needle, production of noises at the driving sources can be eliminated.

REFERENCES:
patent: 3334354 (1967-08-01), Mutschler
patent: 4047185 (1977-09-01), Phillips
patent: 4362407 (1982-12-01), Kolm
patent: 4383265 (1983-05-01), Kohashi
patent: 4552469 (1985-11-01), Tsuge
Mitchell et al.; Inkon Demand Printing . . . ; IBM-TDB, vol. 18, No. 2, Jul. 1975, pp. 608-609.

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