Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1988-07-14
1990-01-23
Wiecking, David A.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, 335266, B41J 312
Patent
active
048954640
ABSTRACT:
A preferred embodiment of a wire matrix print head assembly 10 is described having a housing 16 supporting a plurality of print wires 22 that are capable of moving between retracted nonprint positions and extended print positions for printing indicia onto a print medium. The assembly has a plurality of electromagnetic actuators associated with corresponding print wires 22 for rapidly driving a selected wire upon energization of corresponding electromagnetic actuator. Each electromagnetic actuator has a yoke 76 with five magnetically interconnected poles 84, 86, 88, 92 and 96 and two electrically interconnected coils 100 and 102 surrounding poles 86 and 92 respectively. Each electromagnetic actuator includes an armature 74 biased against and pivoting about an outer pole 88 to move an inner end against a print wire when the coils 100 and 102 are concurrently energized with the same directional polarity. Coils 100 and 102 are separated by the center pole 84. The coil 102 has a smaller profile than the coil 100 and the armature 74 tapers from the outer end 104 to the inner end 108 to enable the electromagnetic drive elements to be angularly spaced about a center axis in a very compact relationship.
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W. Hasler et al., "Print Hammer"; IBM Technical Disclosure Bulletin; vol. 25, No. 9, pp. 4901-4902; Feb. 1983.
Anonymous; "High Performance, One-Piece Print Actuator"; IBM Tech Disc. Bull. vol. 28, No. 12, pp. 5296-5298, May 1986.
Output Technology Corporation
Wiecking David A.
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