<P>PROBLEM TO BE SOLVED: To provide an opening/closing position-controlling unit for a curtain of a hothouse or the like which has the following structure: rotationally transmitting the rotation of a curtain driving shaft to an intermediate measuring shaft via a speed-reducing mechanism; further rotationally transmitting the rotation of the intermediate measuring shaft to a final measuring shaft via the speed-reducing mechanism; paralelly incorporating curtain stop switches mounted on the intermediate measuring shaft and the final measuring shaft into a power source circuit of a curtain driving motor to stop power supply to the driving motor; and stopping the hothouse curtain or the like accurately at a preset opening position or closing position. ??<P>SOLUTION: The opening/closing position-controlling unit for a curtain for a hothouse or the like has the following structure: first, second, and third curtain stop switches in an opening or closing direction are each provided at one portion of the intermediate measuring shaft 45 and two portions of the final measuring shaft 49; the first and the second curtain stop switches are incorporated in parallel into the power source circuit of the curtain driving motor; and the third curtain stop switches 81, 82 are serially incorporated thereinto so that the hothouse curtain or the like can be reliably stopped at a safe stop position exceeding the preset opening position or closing position. ??<P>COPYRIGHT: (C)2010,JPO&INPIT ??
