| 摘要 |
PURPOSE:To stop rotating of a motor at a variable resistor position which can readily turn OFF a power switch by providing the power switch at the positions where the variable resistor is maximum or more and minimum or less. CONSTITUTION:The resistance value of a variable resistor is varied by a knob 12 to alter the rotating speed. The OFF point of a power switch is provided at the variable resistor positions of the maximum resistance value or higher and the minimum resistance value or lower of the variable resistor. Accordingly, even if the position of the variable resistor is disposed at any location, the power switch can be turned OFF in clockwise and counterclockwise directions to be disconnected in the power switch in the direction readily operated. |
