| 摘要 |
PURPOSE:To automatically adjust the corresponding relation between the position of moving matter and a detection member, by providing a pair of switching means detecting the position of a position detection part to control a drive part and a stopper for limiting the moving quantity of the position detection member. CONSTITUTION:When moving matter 1 is moved by operating a motor and rotating a drive shaft 3 and present at an intermediate position, a follower gear 14 is meshed with a gear 21 and a position detection member 15 is moved. When the matter 1 reaches moving upper and lower ends, stoppers 26, 27 prevent the movement of the member 15 and switching means S1, S2 detects upper and lower end positions to reverse the rotation of the motor. By this mechanism, the matter 1 moves downwardly and upwardly. For example, when the matter 1 is positioned at the moving lower end and large external force is applied to a push-down direction, the matter 1 exceeds the lower end but the member 15 can not move and, when the external force is removed, position detection parts 16, 17 show the lower end positions to reverse the rotation of the motor and the matter 1 is moved upwardly. The same operation is performed when the matter 1 is positioned at the moving upper end and the shift of the moving range of the matter 1 can be reduced.
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