| 摘要 |
Each bin in a warehouse is uniquely identified by a binary coded decimal number which locates its position with relation to the remaining bins. A control circuit stores the address of a selected bin and moves a stacker crane in a forward or reverse direction toward the selected bin by subtracting a sensed address at which the stacker crane is located from the stored address identifying the selected bin. As the absolute value of the subtracted difference approaches zero, the stacker crane speed is slowed, and finally stopped when the subtractor reaches zero. The sensed address also controls fine positioning of the crane and various gating for the control circuit.
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