Reel changer

A roll changer for feeding a material web wound on a material roll into a web-processing machine having a support frame, in which at least three material rolls are mounted so they are rotatable, whose rotational axes are each oriented parallel to one another, and which are situated so they are pivotable around a shared pivot axis parallel to their rotational axes, in a first pivot position of the at least three material rolls, one material roll being located in an unwinding area, in which the material web may be fed from said material roll to the web-processing machine, and a pair of support arms being provided for the rotatable mounting of said at least three material rolls around its particular rotational axes, between which the particular material roll is mounted so it is rotatable, and which each project radially from the pivot axis parallel to the particular rotational axis, wherein a cantilever projects from each of the support arms, a pre-tensioning unit for receiving the free end of the material roll held by the affected pair of support arms being held between the cantilevers of the support arms of a pair of support arms.