Metal working – Method of mechanical manufacture – Electrical device making
Patent
1983-10-07
1985-04-30
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
101 9305, 400124, H01F 706
Patent
active
045134960
ABSTRACT:
The high speed print pin actuator disclosed herein is constructed as two sub-assemblies, a U-shaped fixed magnet structure and an armature sub-assembly. One leg of the U-shaped structure constitutes a coil core and the other includes a permanent magnet and a keeper plate, the ends of the keeper and the core being finished to a common plane. The armature assembly includes a flux return bridge structure which extends from the keeper to a region adjacent the end of the coil core and which is bifurcated to receive an armature which is selectively attracted to the coil core. The armature is carried on a spring which is, in turn, mounted on the bridge structure. With the spring in a deflected position, the armature is finished to a common surface with the portion of the bridge which mates with the magnet structure. Accordingly, assembly of the armature sub-assembly with the U-shaped fixed magnet structure is facilitated and accurate parallelism of the armature and pole piece is provided. Preferably, a thin shim of a wear resistant material is interposed between the spring and the bifurcated portion of the bridge structure.
REFERENCES:
patent: 4225250 (1980-09-01), Wagner et al.
patent: 4233984 (1980-11-01), Barrus et al.
patent: 4433927 (1984-02-01), Cavallari
Centronics Data Computer Corp.
Hall Carl E.
Pahl Jr. Henry D.
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