Dot matrix printer

Details Dot matrix printer Dot matrix printer

1986-07-03

1987-04-28

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

046610022

ABSTRACT:
A dot matrix printer has a vertical array of wires for printing on paper, pivotal armatures having plungers, coils wound around cores, main and auxiliary yokes the latter of which has drawn inner and outer peripheries, and posts at positions of the auxiliary yoke corresponding to the shortest paths of magnetic fluxes generated by the coils. Displacement of the auxiliary yoke upon pivotal movement of armatures is minimized to keep a constant gap between the cores and the plungers and to reduce noise. The reluctance of the magnetic circuit is small to improve magnetic efficiency.

REFERENCES:
patent: 3896918 (1975-07-01), Schneider
patent: 4204778 (1980-05-01), Miyazawa
patent: 4222674 (1980-09-01), Mori et al.
patent: 4407591 (1983-10-01), Adamoli et al.
patent: 4453840 (1984-06-01), Hodne

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