Reversal mechanism for a rolling ring drive

A rolling ring drive equipped with a reversal mechanism comprising a stepper motor attached to an inner ring housing, a controller controlling a pitch angle of a central rolling ring and additional respective rolling rings of a rolling ring drive relative to a rotatable shaft extending through the central and additional respective rolling rings via the stepper motor in dependence upon a sensor which detects at least position of the rolling ring drive along the rotatable shaft, wherein the sensor comprises a magnetic incremental measuring system with a scanning head and the pitch angle of the central and additional respective rolling rings and a reversal point of the rolling ring drive along the rotatable shaft are separately changeable by the controller, wherein the stepper motor is attached to a pivotal shaft that is attached to and controls the pitch angle of the central rolling ring, wherein the central rolling ring is connected to a bottom leg of a T-shaped mechanical linkage and each end of a top leg of the T-shaped mechanical linkage is connected to one of the additional respective rolling rings, and wherein the T-shaped linkage has an elongated central hole through which a journal of the central rolling ring passes and relative movement of the journal of the central rolling ring within the elongated central hole is in a direction opposite movement of the T-shaped linkage.