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Linear motor positioning device with position detent means

  • US 3,895,281 A
  • Filed: 08/24/1973
  • Issued: 07/15/1975
  • Est. Priority Date: 09/16/1970
  • Status: Expired due to Term
First Claim
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1. A positioning device for the shifting of a load into any one of a series of predetermined positions, comprising:

  • a plurality of coaxial annular electromagnets;

    an armature mechanically coupled with the load, said armature being provided with core means attractable by said electromagnets upon selective energization thereof into any one of several operating positions corresponding to a desired load position;

    bidirectionally effective electromagnetic detent means for positively retaining said armature in any selected operating position against displacement in either direction; and

    electronic control means for said electromagnets and said detent means including switch means for selectively energizing said electromagnets and timing means in circuit with said switch means for temporarily deactivating said detent means just prior to energization of any electromagnet, the deactivation period of said detent means starting prior to the energization period of the electromagnet and continuing for a portion of the latter period sufficient to enable a displacement of the armature and the load to a new operating position prior to reactivation of said detent means.

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