Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1985-06-10
1987-01-20
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, 101 9329, 4001572, 361152, B41J 938, B41J 312
Patent
active
046377425
ABSTRACT:
A wire drive circuit in an impact dot-matrix printer, having plural solenoids for actuating print wires, a first switching element connected commonly to one ends of the solenoids, plural second switching elements connected in series to the other ends of the solenoids, and a DC power supply connected to the first switching element and to the second switching elements, for selectively energizing the solenoids by turning on the first switching element and the respective one of the second switching elements. The wire drive circuit comprises: plural rectifying elements connected to the other ends of the solenoids; a discharge switching element which is connected to the other ends of the solenoids through the respective rectifying elements, and is turned on when the first switching element is turned off, to discharge electric energy produced by the previously energized solenoid; a main energy-absorbing element connected to the discharge switching element, for absorbing the discharged electric energy; and an auxiliary energy-absorbing capacitor connected to the other ends of the solenoids through the rectifying elements, to absorb a portion of the electric energy which has not been discharged through the discharge switching element, after the discharge switching element is turned off.
REFERENCES:
patent: 4254705 (1981-03-01), Ishikawa
patent: 4454558 (1984-06-01), Huddart
IBM Tech. Disc. Bulletin, by W. A. Boothroyd, vol. 12, No. 7, Dec., 1969, pp. 963-964.
Brother Kogyo Kabushiki Kaisha
Sewell Paul T.
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