Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1984-10-25
1986-03-11
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, B41J 312
Patent
active
045752680
ABSTRACT:
A dot matrix printer head in which movement of a plurality of printing wires is effected by an equal member of circumferentially spaced armatures and the head employs permanent magnet and electromagnetic members for controlling movement of the individual armatures. An annular core base in the head has a plurality of cores of the electromagnetic members disposed in annular array thereon and an annular yoke member having the permanent magnet associated therewith is disposed on said base within said array of cores. Each of the armatures is associated with said yoke and one of said cores so that the permanent magnet provides a magnetic flux tending to move the armatures and printing wire to a non-print position. Each of the cores has a coil thereon which, when energized, neutralizes the flux from said permanent magnet for its core and the armature associated therewith. Spring members associated with each of the armatures bias the armatures and their respective wires toward the print position whereby the individual printing wires are caused to move to their print positions when the electromagnet coils associated therewith are energized. The armatures are positioned at the extremities of the yoke and the cores on one face of the core plate and the printing wires extend from the armatures through a central opening in the plate and out the opposite face of the plate. The extremity of the annular yoke preferably serves as a fulcrum for each of the armatures. Various arrangements for the spring members are employed.
REFERENCES:
patent: 4222674 (1980-09-01), Mori
patent: 4225250 (1980-09-01), Wagner
patent: 4230412 (1980-10-01), Hebert
patent: 4348120 (1982-09-01), Isobe
patent: 4368353 (1983-01-01), Ando
patent: 4389127 (1983-06-01), Bellinger
patent: 4389128 (1983-06-01), Asano
patent: 4444519 (1984-04-01), Howell et al.
Chen Kuo-Chyuan
Yang Wu-ji
Industrial Technology Research Institute
Sewell Paul T.
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