In a foil winder (Fig. 1) large reels of foil are wound up or down. During the winding of the foil mechanical movements must be tuned via the control technology of the drive motors.
To capture the positions of existing linear and rotary axes, absolute encoders are used permitting the precise indexing of positions (Fig. 2 and Fig. 3).
This precision is necessary for the high demands on the winding quality, especially with thin foils (6 µm) and high speeds (1000 m/min) in order to be able to carry out the winding process and the coil reel change.