A slot drum for a winding machine for traversing a yarn has a drum body including a first half and an adjacent second half, the drum body held in a rotationally fixed manner on a drum shaft. The adjacent first and second halves defining a yarn guide slot that extends around the drum body. The first and second halves include a side shield, a cylindrical jacket, and a hub for mounting on the drum shaft. The first half is displaceable on the drum shaft in a direction of the drum axis via an actuator. The first half rotates relative to the second half as the first half moves in the direction of the drum axis.

An apparatus for winding on an object extending in a longitudinal direction has a drum with a supporting surface extending over the periphery for support of the object to be wound on and raised portions which extend radially away from the axis of rotation of the drum at the sides or in lateral regions of the supporting surface, wherein there is provided a device for preventing the windings of the object from piling up, which device includes a shaft] having an external thread, the shaft extending transversely over the supporting surface at a small spacing over a narrow gap from the raised portions and is mounted at a component arranged laterally of the drum.