Impact printer actuator using magnet and electromagnetic coil an

Details Impact printer actuator using magnet and electromagnetic coil an Impact printer actuator using magnet and electromagnetic coil an

1988-12-16

1991-02-26

Wiecking, David A.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by movement of record-medium against type-face

400124, 101 9305, 101 9329, 335229, 29607, B41J 228

Patent

active

049957449

ABSTRACT:
A print actuator for a dot matrix printer has a stator with a frame, at least two ferromagnetic poles and at least one permanent magnet; and at least one electromagnetic coil surrounding the magnet. The magnet can generally hold an armature in a home position by its magnetic flux until the coil is energized at which point the magnetic flux of the magnet is neutralized by the magnetic flux of the coil and the armature is substantially released of influence from the magnet's hold.

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Bateson, J. E. et al., "Print Hammer Mechanism", IBM Technical Disclosure Bulletin, vol. 22, No. 8B, Jan. 1980, pp. 3536-3537.
Hasler, W., et al., "Print Hammer", IBM Technical Disclosure Bulletin, vol. 25, No. 9, Feb. 1983, pp. 4901-4902.
Skinner, D. W.; "No-Work Print Hammer"; IBM Technical Disclosure Bulletin; vol. 21, No. 11, pp. 4452-4453; Apr. 1979.
Barcomb, J. G. et al.; "Print Hammer Flight Time Variation Control"; IBM Technical Disclosure Bulletin; vol. 22, No. 8A, pp. 3171-3172; Jan. 1980.
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