Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1979-03-30
1980-12-02
Pieprz, William
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
335279, 335274, B41J 310
Patent
active
042368367
ABSTRACT:
A wire matrix printer includes a plurality of electromagnetic actuators for use as dot-matrix printer drive elements. Each actuator has a unitary bobbin body made of insulating material which includes a slot arranged to receive a flat plate armature of ferromagnetic material. The bottom of the slot is sufficiently wide to receive an edge of the plate armature and the open portion of the slot is sufficiently wide to permit the plate to pivot around the edge positioned in the bottom of the slot towards a pole of an electromagnet and then away from it to the armature's rest position. The flat plate armature includes an integral spring portion with an end which is arranged to engage a notch in the bobbin body. Positioning of the end of the spring portion in the notch flexes the spring portion sufficiently so as to provide a spring force to return the armature to its rest position, as well as, keep the armature in the slot. This arrangement allows easy, low cost assembly of bobbin and armature since no hinges, screws or external springs are necessary.
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Albrecht J. C.
Pieprz William
Teletype Corporation
Tirva A. A.
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