| 摘要 |
PURPOSE:To prevent the displacement of recording by a carriage in its speed fluctuation by automatically controlling a driving current in a motor in accordance with a speed deviation. CONSTITUTION:A DC tachometer generator 10 detects a stepping motor for its rotary speed, inputting its value to an operational amplifier 9. The operational amplifier 9 compares a detected rotary speed with a speed intended to be obtained from a converter 14, outputting a signal in accordance with the comparison to a current controlling transistor 2. Consequently, the stepping motor is driven, and its driving current is automatically controlled in a manner wherein the stepping motor agrees with the speed intended to be obtained. As the result, a carriage, when it is at a fixed speed, obtains a stable speed, preventing the quality of recording from deteriorating. |
