| 摘要 |
A strip feed control apparatus for controlling the size of a loop formed in a continuous strip of material extending between a strip issuing machine and a takeup or strip using machine. The apparatus comprises a photoelectric control for producing an on-off output signal alternating between two levels dependent on whether or not the photoelectric light beam is interrupted by the loop. An electrical circuit means converts this alternating on-off signal into a smoothly variable DC signal proportional to the rate of the alternating on-off signal. The variable DC signal is effective to adjust the speed of a variable DC drive motor which, in turn, adjusts the speed of the strip feed to vary the size of the loop so as to approach a predetermined optimum loop size.
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