Electromagnetic reciprocating linear actuator with permanent magnet armature
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United States of America Patent
Stats
-
Mar 31, 1981
Grant Date -
N/A
app pub date -
Nov 22, 1977
filing date -
Nov 22, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
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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