The invention disclosure here describes a traversing device for yarns with which the yarn position can be moved between two end positions. This is required, for example, when winding a yarn bobbin or for weft insertion during knitting. A rotating yarn guide and a slit-shaped straight edge are to be used for this purpose. The continuous movement avoids the high acceleration forces that would otherwise occur at the reversal points of an oscillating rod. Which allows faster speeds to be achieved.