Print pin actuator and method of making same

Typewriting machines – Typing by other than type-face or type-die – Character formation by impact

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Details

400174, 101 9305, B41J 312, B41J 310

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active

045824371

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.

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IBM Tech. Disc. Bulletin, "Print Hammer Adjustment Means", Helinski, vol. 24, No. 3, Aug. 1981, pp. 1700-1701.
"Optimizing the Performance of an Electromechanical Print Mechanism", Baily et al., Hewlett-Packard Journal, Nov. 1978, pp. 23-31.

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