Direction of movement is either from left to right or from right to left. The direction of movement can be chosen with a selector switch.
The loop control is realized with an infrared sensor. Due to direction of movement the infrared sensor tests the upper or lower position of the loop.
Winding speed is 20 turns/minute or 35 turns/minute. ,
Main drive with a frequency-controlled unitworm gear motor.
Diameter control of the coil with an infrared sensor.