Actuator for a wire matrix printer and method of making

Details Actuator for a wire matrix printer and method of making Actuator for a wire matrix printer and method of making

1975-07-03

1977-07-26

Rader, Ralph T.

Textiles: fiber preparation

101 9333, 335274, B41J 304

Patent

active

040377040

ABSTRACT:
An actuator for a wire matrix printer including a plunger which is mounted in a frame for reciprocal movement between first and second positions therein, and the plunger has a print wire fixed thereto by a special swaging technique. The plunger is moved to and held in the first position against the bias of a special spring by a permanent magnet. When the actuator is to be fired, a neutralizing coil is energized to nullify the holding effect of the magnet, enabling the spring to accelerate the plunger towards the second position (towards a platen). The spring is disconnected from the plunger after it is accelerated, enabling the plunger and print wire attached thereto to travel ballistically at least part of the way to the second position from the first position.

REFERENCES:
patent: 3672482 (1972-06-01), Brumbaugh et al.
patent: 3690431 (1972-09-01), Howard
patent: 3787791 (1974-01-01), Borger et al.
patent: 3804009 (1974-04-01), Blume
patent: 3831729 (1974-08-01), Howard
patent: 3842734 (1974-10-01), Gomi
patent: 3850278 (1974-11-01), Mihm et al.
patent: 3940726 (1976-02-01), Gershnow

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