| 摘要 |
<p>PURPOSE:To prevent the damage and sag of a magnetic tape and the overloading of a motor, by operating the main brake of a reel turntable momentarily in the ending of loading and slowly in the beginning of unloading. CONSTITUTION:A cam surface 20 provided to a loading disk 11 has a gentle bevel at its edge, and a variable angle cam 440 rotatably in directions a5 and a6 is provided to the edge while energized in the direction a5 by a spring 442. In the ending of loading, a detection arm 78 is rotated momentarily by the variable angle cam 440 in the direction a6, so a main brake operates on a reel turntable device momentarily. In the beginning of unloading, a roller cluthc 81 moves up along te becel of the cam surface 20, so that any large load is not applied on a loading motor.</p> |
