| 摘要 |
PURPOSE:To eliminate trouble originating from the presence of a signal line by detecting a moving member arriving at both end parts within a movement range from the extent of the rotation of a rotating shaft which transmits a driving force to the moving member, and limiting the movement range. CONSTITUTION:A motor MT-Y rotates forward or backward to rotate a prismatic shaft 42, rotating the 1st gear G1 and the 2nd gear G2. When a frame body 38 moves forth until a movement limit position, a pin P presses the actuator A3 of a switch MS by the counterclockwise rotation of the gear G2 to input a signal to a control circuit, and conduction to the motor MT-Y is cut off to stop the forward movement of the frame body 38. When the frame body 38 moves back until a movement limit, on the other hand, the pin P presses the actuator A4 of a switch MS4 by the clockwise rotation of the gear G2 to stop the backward movement of the frame 38 similarly. Therefore, the need for the signal line is eliminated, so the trouble originating from the presence of the signal line is eliminated. |
