Release type dot printer head

Details Release type dot printer head Release type dot printer head

1984-02-23

1985-11-26

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 335274, B41J 312

Patent

active

045551928

ABSTRACT:
The present invention provides a release type dot printer head wherein an urging force of an armature in a printing direction for driving a print needle is exerted by a non-linear spring such as a conical spring. Hence, the urging force can correspond to a variation of an attracting force of the armature by a permanent magnet. Consequently, an energizing current for a coil can be reduced, and thus high speed printing can be attained by the arrangement.

REFERENCES:
patent: 4016965 (1977-04-01), Wirth et al.
patent: 4049107 (1977-09-01), Murat
patent: 4240756 (1980-12-01), Ku et al.

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