| 摘要 |
<p>PURPOSE:To carry in and out loads with high time efficiency without collapse of a load stack by variably-setting the accelerating/decelerating speed of the elevating travel of a lifter so as to obtain a proper value according to loading weight. CONSTITUTION:A load cell 65 which serves as a weight detecting means is installed at a locking part to an upper beam 15 by the wire fixture 41 of a suspending wire 45 in a lifter disposed between a pair of columns 13, and the loading weight of a load G applied onto the lifter is detected from tractive force which works upon the suspending wire 45. An output signal of the load cell 65 is inputted into a control device, and accelerating/decelerating speed and stationary speed are variably-set to proper ones in an elevating drive motor 63. Namely, the heavier the loading weight is, the lower speed of the elevating drive motor 63 is set. It is thus possible to operate the lifter at a high speed within such a range as the load stack is not collapsed, and to carry in and out the loads with high time efficiency.</p> |
