| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a conveyor in which a speed of a motor can be changed with a simple constitution. <P>SOLUTION: The number of rotation changes according to a voltage to be applied to a motor roller with a voltage at a point (a) in the motor roller. When a voltage value to be applied to the motor roller becomes higher, the number of the rotation of the motor roller becomes higher. When the voltage value becomes lower, the number of the rotation becomes lower. The number of the rotation of the motor roller becomes the highest when it is in a state that a current flows through a path from a DC power supply Vcc to a resistor R1, a diode D2, a variable resistor VR4, and a resistor R2 without selecting any one of the variable resistors VR1-VR3. When the variable resistor VR1 is connected by selecting an operational amplifier 51 by an output unit 42, a current flows through a path from the DC power supply Vcc to the resistor R1, the diode D2, the variable resistor VR4, and the resistor R2, and through a path of the variable resistor VR1 connected in parallel to the variable resistor VR4 and the resistor R2. The number of the rotation reduces by the reduction of a voltage caused by the reduction of a voltage division ratio by connecting the variable resistor VR1 to the variable resistor VR4 and the resistor R2. <P>COPYRIGHT: (C)2004,JPO |
