| 摘要 |
<p>PURPOSE: To control tension as well as to prevent excessive tension by providing band brakes on both supply and take-up reels respectively and setting them to be a bite side when feeding and to be a relief side when taking up respectively. CONSTITUTION: When being an FWD mode, a tape coming out of the supply reel 1 is traveled via a guide post 29, a tension guide 27 and a tape guide 22a. Tension of a spring 36 is received by the brake band 38 at its moving end 38a via a tension arm 25, so that braking force is applied to a brake drum 40 of the supply reel 1, and the tension is imparted to the tape. When the tension is increased, the tension guide 27 is operated to weaken the braking force of the brake band 38 against the tension of the spring 36, and the tension of the tape is controlled to be constant. The fixing end 38b of the brake band 38 is so arranged that the brake should be on the biting side when feeding rotation, and hence on the relief side when taking up rotation to weaken the braking force.</p> |
