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STACKER CRANE POSITION CONTROL SYSTEM WITH AN AUXILLARY VERIFYING MEANS

  • US 3,581,915 A
  • Filed: 09/19/1968
  • Issued: 06/01/1971
  • Est. Priority Date: 09/19/1968
  • Status: Expired due to Term
First Claim
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1. In an automatic warehousing system having a storage structure and a load-handling carrier for delivering and picking up loads at a plurality of load storage locations in said storage structure, control means for said load carrier for controlling actuation of the latter to the selected load storage locations, and means coacting with said control means for verifying the position of said load carrier as indicated by said control means for the selected load storage location, said control means and said verifying means both including separate and independent signal-Producing means for respectively signalling the position of said load carrier in said storage structure, a common output means to which said signal-producing means are operatively coupled, and means responsive to said output means to prevent actuation of said load carrier to handle a load at the then confronting storage location if the load carrier position as indicated by said control means fails to match the corresponding position as indicated by said verifying means.

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