| 摘要 |
<p>PURPOSE:To prevent a tape from abnormally running or being damaged based on the temperature change of a cassette device at the cassette type magnetic tape unit for recording and reproducing data. CONSTITUTION:A transistor 27 for control is serially connected to a pair of reel motors 13 and 14 for driving a pair of reels, and first and second transistors Q1 and Q2 for switching forward and backward are connected. Transistors Q3 and Q4 for tension control are parallelly connected to the first and second transistors Q1 and Q2. Based on a signal detecting the running speed of the tape with a speed detector, the transistor 27 for control is controlled. At the time of loading the cassette, a gap between the reel and the tape is removed by running the tape forward and backward respectively for 100ms.</p> |
