Yarn storage unit for textile machine station

The invention relates to a yarn storage unit for a textile machine station, in particular for a spinning position and/or a winding position, having a yarn guide arm pivotably mounted about a pivot and a controllable drive unit for reversibly pivoting the yarn guide arm. In order to provide a yarn storage unit which particularly reliably allows the yarn tension to be maintained substantially constantly during winding, it is provided that the yarn guide arm is freely rotatably mounted and has a magnetically active first engagement member which is arranged at a distance from the pivot, the drive unit is provided with a second magnetic engagement part which is adjustably arranged relative to the first engagement part and exerts a magnetic repulsive effect on the first engagement part, and the second magnetic engagement part can be arranged on the drive unit in an effective connection mode with the first engagement part. Wherein adjustment of the second engagement member towards the first engagement member causes