| 摘要 |
<p>PURPOSE:To keep the tape tension of a rotary head part at the same value even when the coefficient of surface friction of a tape is different by providing a means to change the load of a balance spring by moving the position of a hooking part engaged with the balance spring of a tension detecting arm. CONSTITUTION:When tape tension is low, the tension detecting arm 1 is moved in a direction to stretch a band brake 2, and the brake 2 increases the tape tension by tightening a reel disk 3 with the balance spring 7. When the tape with a different coefficient of friction is used, the tape tension at the part of a tension detecting post 1a should be changed in order to keep the tape tension of a rotary head drum 9 constant since the frictional force of a tape guide post 11 is different from that of a tape guide post 12. A spring bar 4 is moved by rotating the rotary shaft 5a of an eccentric cam 5 by rotating the adjusting knob 5b of the eccentric cam 5, and the load of the balance spring 7 is changed, then, the appropriate tension at the part of the tension detecting post 1a can be obtained.</p> |
