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According to the cable manufacturing process requirements, different types of cables, which traces the speed is constant. Typically, the speed of the cable is driven by the cable detection rotary encoder.
Using the rotary encoder, rotation pulse output 1 000. Thus, within a certain time based on the number of pulses detected, we can calculate the speed of the cable routing. In practice, the machining with a high precision, a circumference of 500 mm of the rotary encoder measuring the capstan mounted coaxially with the rotary encoder, the driving wheel in contact with the cable. In cable production during exercise, relying on friction pulling the measuring wheel rotation, so put the cable linear displacement (length) into rotary encoder pulse digital signal output.
Let rotary encoder per revolution, which counts the number of pulses NP (number of pulses / rev), the rotary encoder angular resolution (unit: (°) / a) as follows:
P = 360/NP
Assumed fixed on the shaft of the rotary encoder active guide wheel radius rm, the displacement resolution rotary encoder (unit: m / a) is:
Ps = 27πr/NP
In this case, if the counted number of pulses is N (a), measured by the rotary encoder displacement amount S (unit: m) is:
S = Ps · N
Cable walking speed V (Unit: m / s) as follows:
V = S / T
Where: T is the N pulses received the time (unit: s).
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Mechanical Pulling Counter 
Rotary encoder Applications on Detection and control
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