Dot printer head

Typewriting machines – Typing by other than type-face or type-die – Character formation by impact

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Details

400174, 400121, 101 9304, B41J 160, B41J 156

Patent

active

046261150

ABSTRACT:
A dot printer head including a plurality of cores each surrounded by a coil, a yoke connected to the cores magnetically, and a plurality of armatures each facing one of the cores and the yoke and having one end to which a needle is connected. A plurality of projections are provided on the yoke, and each armature has an opening in which one of those projections is engaged. This arrangement enables each armature and the yoke to face each other in a large area, while the area in which they face each other and which extends in parallel to the armature can be small. The pivot about which each armature is rotatable can be brought closer to the corresponding core. This enables a reduction in the air gap between the armature and the core and thereby the production of a large attracting force from a small magnetomotive force. It also enables a reduction in the equivalent mass of each armature and thereby an increase in the speed of printing and a reduction in the power consumption of the printing apparatus.

REFERENCES:
patent: 4140406 (1979-02-01), Wolf et al.
patent: 4230038 (1980-10-01), Hebert
patent: 4242004 (1980-12-01), Adler
patent: 4279521 (1981-07-01), Kightlinger
patent: 4320981 (1982-03-01), Harrison et al.
patent: 4444519 (1984-04-01), Howell et al.
IBM Tech. Disc. Bulletin, "Articulated Print Wire Actuator", Lisinski, vol. 21, No. 1, Jun. 1978, pp. 18-19.

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