| 摘要 |
<p>A tape driving apparatus comprises reel driving circuits for driving a supply reel and a take-up reel, respectively, tape radius detecting circuits for detecting information of a tape radius remaining on the supply reel and wound on the take-up reel, respectively, a take-up (or supply) reel controlling circuit for producing take-up (or supply) side torque information and controlling the take-up (or supply) reel, a coefficient setting circuit for setting a determining coefficient of feed torque for the supply (or take-up) reel in accordance with the tape radius information of the supply or take-up reel, a feed torque value determining circuit for determining feed torque information of supply (or take-up) reel from the take-up (or supply) side torque information, the tape radius information of the supply and take-up reel and the determining coefficient of the feed torque, a back (or take-up) torque value determining circuit for determining back torque information proportional to the tape radius information of the supply reel (or take-up torque information of the take-up reel during tape travel at a constant-speed), a decision circuit for outputting a torque information change-over signal on the basis of a mode change-over command, the feed torque information and the back (or take-up) torque information, and a change-over circuit for sending either one of the feed torque information and the back (or take-up) torque information to the supply (or take-up) reel driving circuit on the basis of the torque information change-over signal. <IMAGE></p> |
