| 摘要 |
<p>PURPOSE: To prevent inclination of an elevating unit caused by unbalance of winding quantity between respective winding members by respectively winding corresponding suspension members via corresponding suspension pulleys by means of winding drum members. CONSTITUTION: By rotation-driving respective winding drum members 33a-33d, the winding drum members 33a-33d corresponding to wires 31a-31d for suspending four corner parts of an elevating unit CU are taken up. In this case, winding of the wires 31a-31d onto the winding drum members 33a-33d are guided via suspension pulleys 61a-61d. Even when a portion between the suspension pulleys 61a-61d of the wires 31a-31d and the elevating unit CU is swung because of some reason, a portion between the suspension pulleys 61a-61d of the wires 31a-31d and the winding drum members 33a-33d is hardly swung. Consequently, the wires 31a-31d never fall off from winding grooves and a winding diameter is never changed between respective winding drum members 33a-33d. Accordingly, winding quantities of wires 31a-31d in the respective winding drum members 33a-33d are made uniform.</p> |
