Automatic spreading adjustment

摘要

Device has a displacement shear pair (120) moved reversibly in a linear movement opposite to a displacement shear pair (110). A drive unit (320) drives the linear movement of the displacement shear pair (120). A drive force transmission unit (310) is provided between the drive unit and the displacement shear pair (120). The drive force transmission unit transmits a drive force generated by the drive unit, on the displacement shear pair (120). The drive force transmission unit is swivelable reversibly about a swivel point (340), where the position of the swivel point is adjustable.