| 摘要 |
PURPOSE:To improve the abrupt acceleration rise characteristics of a motor by mounting a pully for operating as a shaft on a rotational shaft, obtaining a winding torque of a takeup reel base via a belt from the pulley, and reducing the twisting deformation of the shaft to decrease the fluctuation. CONSTITUTION:A drum 7 and a pulley 20 operated also as a bearing are mounted on the rotational shaft 1 of a capstan motor, thereby restricting the axial movement of bearings 2a, 2b disposed between the drum 7 and the pulley 20. Then, a belt 27 is engaged on the pulley 20 to obtain the takeup torque of the takeup reel base. In this manner, the vibration of the shaft 1 can be reduced without increasing the number of parts. In this case, when a rotary permanent magnet 9 is disposed at the yoke 11 side, the vibration can be further reduced. A brake unit 21 is mouted at the position of the idler which becomes unnecessary, thereby associating the brake unit without increasing the size. |
