in order to allow an adjusting of the bending tools to a given diameter of the wire being bent allowing the producing of the requisite bending radius a central mandrel which forms two bending or forming , respectively , jaws is replaceable together with a shearing tool . to this end a hollow shaft is mounted at the rear of the central mandrel , which shaft is mounted to a supporting shaft by means of a screw joint . the supporting shaft is supported in turn rotationally and can be rotated by means of a motor in order to disconnect the central mandrel . by mentioned rotation the screw joint is released . a special coupling of the shearing tool to an axially movable operating shaft allows a simultaneous disconnecting of the shearing tool together with the central mandrel . a bending mandrel is mountable at locations having various radial distances from the central mandrel . a cover plate provided with a position control element operates together with proximity switches such that two defined initial angular positions of the bending mandrel is maintained independently from mentioned adjustments .