| 摘要 |
<p>The reel servo as well as other servos in the machine are controlled by a single microprocessor (30) which results in greater inherent communication between such servos and significantly improved operating capabilities. The reel servo itself is adapted to have the supply and take-up reels (60, 64) operate in different kinds of close loop servo control during various operating modes. The servo circuitry provides instantaneous information to the microprocessor (30) for determining the diameter of tape (72) that is wrapped on each of the reels. The reel servo has the capability of performing high speed shuttle and cueing operations without engaging the capstan (76) and the tensioning arm (20) can be positioned to provide the appropriate tape tension during shuttling in both the forward and reverse directions. An acceleration loop controls the supply reel (64) so that the tape tension is maintained within predetermined upper and lower limits.</p> |
