| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate variance of a position of a tension post of the mechanism under the stopping state and also to miniaturize a chassis. SOLUTION: The mechanism is equipped with a 1st tension lever 1 and a 2nd tension lever 2 rotatably supported on the chassis 7. A positive motion cam 4 for changing the 1st tension lever 1 to approach or separate from a magnetic tape 6 by engaging with the 2nd tension lever 2 is provided in the vicinity of the 2nd tension lever 2. An auxiliary lever 3 for energizing the 1st tension lever 1 in the direction of making pressurized contact with a housing of a motor 5 in a position when the 1st tension lever 1 is abutted on a stopper on the chassis 7 after the tension post 10 is separated from the magnetic tape 6 is rotatably supported on the 2nd tension lever 2.</p> |
