Solenoid plunger magnet and its use as print hammer in a print hammer device
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United States of America Patent
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Nov 19, 1991
Grant Date -
N/A
app pub date -
Apr 30, 1990
filing date -
Sep 1, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solenoid plunger magnet system is disclosed, preferably to be used as print hammer in a print hammer device. Known solenoid plunger magnets have in the exciting coil a first interferric gap as working interferric gap and a second interferric gap outside the exciting coil as loss interferric gap. The magnetic lines of force at the second gap are lost as moving forces for the solenoid plunger. The purpose of the invention is to increase the magnetic force of solenoid plunger magnets by using the second gap as well for generating forces, without affecting the generation of forces at the inner gap. For this purpose, a male taper control is arranged at the outer gap, which has a cylindrical shape and the usual length of loss gaps. A considerable increase of the magnetic force is thus achieved.
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