Method and apparatus for determining the zero position of a thread guide changierbaren

The invention relates to a method and an apparatus for determining the zero position of a stepping motor via a changierbaren thread guide a winding device of a cheese-producing textile machine. According to the invention it is provided that the yarn guide (25) by the stepping motor (34) acted upon firstly in the direction of its zero position (NS) process and arranged at a low speed at a in the direction of travel behind the zero position (NS), defined stop (15) is positioned. The stepping motor (34) is then de-energized, whereby the rotor (41) of the stepping motor (34) falls into one of two possible rest positions (RS1, RS2). Subsequently, the stepping motor (34) by defined energization of its stator winding (20A, 20B) is controlled so that the rotor (41) of the stepping motor (34) after a new switch off in the rest position (RS2), in which the yarn guide (25) is positioned in its zero position (NS).