| 摘要 |
<p>PURPOSE:To stabilize tape running speed with high accuracy by transmitting the rotational force of a motor speed controlled by fed back output of an FG detector provided on a reel base through a timing belt. CONSTITUTION:A motor 10 is rotated forward and backward and at constant speed and at high speed responding to control signals from a motor control circuit 26 and the speed is set by a speed setting device 25 according to a constant speed mode and a high speed mode. Output from the speed setting device 25 is compared by a comparator 28 to which signals from a speed detecting circuit 26 including an FG detectors provided on reel bases 1, 2 are applied through an arithmetic unit 27. The motor 10 is controlled according to the result of comparison, and a mechanism driving system 29 including the reel base is driven to become the speed set by the speed setting device 25, and tape speed is stabilized. In such constitution, at the time of a constant speed mode, the motor 10 is rotated in the direction reverse to the arrow mark shown in the figure, and a relay pulley 8 is rotated in the same direction through a timing belt 13 and a driving gear 7 is rotated clockwise.</p> |
