Dot printer head

Details Dot printer head Dot printer head

1979-02-01

1981-01-13

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

042446589

ABSTRACT:
In a dot printer head, a small, thin and flat lever or chip pivots on a fulcrum when attracted by an electromagnetic coil. Pivoting of the chip on the fulcrum drives a needle, in opposition to a biasing spring, against an ink ribbon and paper for printing on the paper with dots. The biasing spring returns the needle after printing. The fulcrum is positioned by a resilient restraint comprising a leaf spring. The magnetic gap between the coil and chip is small but provides a long needle stroke because of the mechanical advantage in the pivoting element. The gap requires no adjustments. The printer head includes a plurality of similar independently operating needles and drive mechanisms.

REFERENCES:
patent: 3477049 (1969-11-01), Kreidler
patent: 3929214 (1975-12-01), Hebert
patent: 4009772 (1977-03-01), Glaser et al.
patent: 4060161 (1977-11-01), Nelson et al.
patent: 4136978 (1979-01-01), Bellinger et al.
patent: 4165940 (1979-08-01), Cacciola

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