Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1977-11-22
1981-03-31
Duggan, Donovan F.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
310 15, 310 30, 400124, 318120, H01F 708
Patent
active
042596530
ABSTRACT:
A spring-less linear actuator, especially useful as a print wire drive. A permanent magnet armature is driven from a rest position on a pole piece by magnetic repulsion upon energization of a solenoid by a D.C. pulse. The armature is fixed to a print wire which rebounds from a printing medium, thereby returning the permanent magnet toward the rest position, where it is held, without bouncing, by the magnetic attraction between the armature and the pole piece of the solenoid, which is now de-energized.
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patent: 3543279 (1970-11-01), Rempel et al.
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patent: 3755766 (1973-08-01), Read, Jr.
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patent: 3946851 (1976-03-01), Cestrieres et al.
patent: 4046244 (1977-09-01), Velazquez
patent: 4129187 (1978-12-01), Wengryn et al.
IBM Tech. Disclosure Bulletin, "Actuator for Wire of Matrix Printer", Meier, vol. 20, #8, 1/78.
Duggan Donovan F.
Magnetic Laboratories, Inc.
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