| 摘要 |
<p>PURPOSE:To always keep a tension of a magnetic tape correct by providing a one-way clutch by which a driving force of a driving motor is transferred to a reel only when winding the magnetic tape, and the transfer of the driving force is detached when feeding out the magnetic tape, on a reel driving device of a tape magnetic recording and reproducing device. CONSTITUTION:The lower end of a clutch spring 13 is fixed to a bush 10, a reel 11 is wound in the same direction as the direction for winding a magnetic tape 1, and its upper end is engaged to a reel base 12 only at the time of winding and transmits a rotational force. When a one-way clutch means constituted in this way is installed to both a supply reel 2 and a winding reel 6, in case one reel, for instance, the winding reel 6 winds the magnetic tape 1, as for the supply reel 2, a transfer of a driving force of a driving motor 7 is detached through the clutch spring 13, and as for the winding reel 6, the driving force is transferred, therefore, a remarkable increase of a tension of the magnetic tape 1 and the generation of a sag by moment of inertia of the driving motor 7 of the supply reel side can be prevented.</p> |
