Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1989-07-25
1990-07-31
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335276, H01F 708
Patent
active
049453319
ABSTRACT:
An electromagnetic actuator for driving a hammer of an impact printer includes a solenoid and an armature which is attracted thereby. In a state of standby for printing, no current is supplied to the solenoid, and the armature holds the hammer in an urge-accumulated state. Upon supply of a current to the solenoid, the armature is attracted toward the core, and the hammer head in that state is released so as to be impacted against a platen, thereby effecting a printing operation. If the current is shut off with the armature attracted by the core of the solenoid, the armature returns to its original position. To effect a speedy return at that juncture, a return leaf spring having a resilient bent portion is interposed between the core and the armature.
REFERENCES:
patent: 3148313 (1964-09-01), Hancock
patent: 3389354 (1968-06-01), Ahlberg
"Impact and Noise Abatement Apparatus for Electromagnetic Actuators,", IBM Technical Disclosure Bulletin, vol. 21, No. 2, Jul. 1978, p. 694.
"Slip-On Magnet Residual", IBM Technical Disclosure Bulletin, vol. 13, No. 8, Jan. 1971, p. 2234.
Citizen Watch Co. Ltd.
Harris George
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