| 摘要 |
<p>PURPOSE:To reduce the number of parts and to simplify the mechanism by providing a motor driving means for controlling a motor for driving a reel in order to make tension force of a tape constant in accordance with a winding diameter value of the reel. CONSTITUTION:A tape winding diameter value R (t) of a reel on the tape feed side to be obtained by a ratio of a reel revolving speed signal N (t) as to the reel on the tape feed side changed by a switch to a revolving speed value (n) from an encoder 3 and a radius (r) of the encoder 3 is calculated by a winding diameter calculating part 28, and this is inputted to R-side of an input terminal of a switch 16 and F-side of an input terminal of a switch 19. Outputs P (t) of the individual motors are controlled by driving circuits 20 and 24 upon receipt of this tape winding diameter value R (t), and back torque is generated to make tension so as to give the tape constant tension.</p> |
