Abstract: Slicing device for breads, having a plurality of endless slicer bands which extend substantially parallel to each other and which are passed over drums. At least one of the drums is automatically adjustable and acts as a tensioning means for maintianing a substantially constant tension in the slicer bands. The adjustable drum is supported by cylinder-plunger assemblies one at each side of said drum. The cylinder-plunger assemblies are operable independently of each other. The supports of both drums are connected to each other by a bracket which is mounted to a stationary frame on one side of the respective drum. Both brackets extend in between both parts of the slicer bands.