| 摘要 |
TAPE LOADING APPARATUS In a magnetic tape cassette recording and/or reproducing device having a tape loading apparatus for withdrawing tape from an operatively positioned cassette and wrapping the withdrawn tape about a guide drum having a rotary head for recording or reproducing signals on the tape; supply and take-up reel motors apply torques to resist unwinding of the tape from supply and take-up reels in the operatively positioned cassette, a servo-control maintains the supply reel in a stopped condition during a loading operation, the ratio of currents supplied to the supply and take-up reel motors, respectively, for achieving the stopped condition of the supply reel and for applying a constant torque to the take-up reel is determined and the radius of the tape wound on one of the reels is calculated from such ratio, whereupon, a value of the torque that has to be applied to that one reel for maintaining a predetermined tension in the tape during the loading operation is calculated in accordance with the calculated radius of the tape wound on that one reel. |
