| 摘要 |
PURPOSE:To reduce consuming quantity of current when the electromagnetic solenoid absorbs a material to be controlled by a method wherein the current flowing in the electromagnetic solenoid is made as to be reduced. CONSTITUTION:When a switch 2 is made to ON, the current flows in the electromagnetic solenoid 4, and the solenoid 4 absorbs the material to be controlled placed at the prescribed distance. At the same time, a switch 6 is made to ON-state. Therefore base potential of a transistor 5 is divided by a resistor 3 and a resistor 7 to reduce the voltage of the base. Accordingly conductivity of the transistor 5 is made to shallow, and the current flowing in the solenoid 4 is also reduced. But the resistance value of the resistor 7 is set at the value as to make a current being enough to hold the material to be controlled in the absorbed condition to flow in the solenoid 4. Accordingly an excess current is not consumed even when the solenoid 4 absorbs and holds constantly the material to be controlled. |
