| 摘要 |
<p>PURPOSE:To control a correct tape tension by providing a storing means to store successively the average value of the output of a tension detecting means in the set time. CONSTITUTION:The title device has a storing circuit 8 to store successively the average value in the time set beforehand of an output signal based on the change of the resistance value of a tape tension detecting means 1, a mode setting circuit 9 and a time setting circuit 10 to delay the time set by the output signal of the mode setting circuit 9 and operate a switching circuit 5. When shifting is executed from an ordinary reproducing mode to a quick feeding reproducing mode, immediately after shifting is executed to the quick feeding reproduction, the tape travelling speed is quickly increased, and therefore, the switching circuit 5 is operated by an output signal (b) of the time setting circuit 10, the signal to enter a control circuit 6 is averaged at the time of stable travelling until then and switched to a signal stored in the storing circuit 8. Thus, a reel motor 4 can be driven by an always stable signal.</p> |
