| 摘要 |
A system for measuring tape thickness, instantaneous position and the entire length of the tape uses encoders on the supply and take-up reels to measure rotation rate. Counters actuating various multivibrators are used to determine a predetermined number of revolutions. Instantaneous position and thickness data are produced using data taken from take-up reel rotation and entire length data uses additional rotation data from the supply reel. Encoder outputs from reel rotation are counted to ultimately produce pulses for every third revolution of the reels. An oscillation pulse train of predetermined frequency is divided and counted by a binary counter reset by a gate circuit producing exclusive logic sums of multivibrator outputs of each and every third revolution. The counter output is provided to a latch circuit. By comparison and computation, the various outputs are obtained.
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