Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1984-06-05
1985-11-12
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
400470, 101 9305, B41J 312, B41J 2718
Patent
active
045524726
ABSTRACT:
An ink dot printer includes an ink tank having a magnetic ink supplying hole and an air opening; a pair of magnetic pole plates arranged to form a slit one end of which is immersed in magnetic ink in the ink tank; and an electromagnet for magnetizing the magnetic pole plates to introduce the magnetic ink in the ink tank into the slot to form a magnetic ink film. A plurality of needles arranged adjacent to one another along the longitudinal direction of the slit are each freely movable in its longitudinal direction between a first position where one end portion is immersed in the magnetic ink film in the slit, and a second position where the one end portion is projected from the magnetic ink film. Electromagnets selectively drive the needles to move them from the first position to the second position, wherein the needles selected force the magnetic ink adhered on their one ends at the first position, onto a recording paper to form dots of the magnetic ink. Characters thus are printed by groupings of the dots; and a magnet is provided for returning ink which remains in the slit to the ink tank when the pole plates are not in a magnetized state.
REFERENCES:
patent: 4194846 (1980-03-01), Zerillo
patent: 4279519 (1981-07-01), Shiurila
patent: 4353654 (1982-10-01), Shiurila
patent: 4400102 (1983-08-01), Shiurila et al.
IBM Technical Disclosure Bulletin, vol. 18, No. 9, Feb. 1976, p. 2761, Armond, U.S., D. P. Darwin et al.: "Magnetic Method of Inking Print Wires".
Kimura, deceased Tsutomu
Makino Ayumu
Torisawa Yoshiro
Tsuge Takeyoshi
Sewell Paul T.
Tokyo Electric Co. Ltd.
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