at one end rollers 10 cooperating with the pressing member 5 while the opposite ends from the rollers 10 act upon slides 11 mounted in the guide portion 8 each of the slides 11 has a bending roller 13 and a shaping roller 14 on a spindle 12 by means of the pivotable levers 9 the bending rollers 13 can be moved out of a position that defines a maximum working aperture for the tool into a position that defines a minimum working aperture for the tool specifically in a downward movement of the rotating shaping tool as indicated by the arrow 16 a depressor 15 first of all presses directly on a workpiece 17 namely an inhaler cartridge 36 as the downward movement continues the levers 9 are pivoted in the direction of the arrow 18 as a result of the activity of the conical region 6 of the pressing member 5 and the pivoting movement of the lever 9 is converted into a radial advancing movement of the slide 11 in the direction of the arrow 19 in order to move the bending roller 13 and the shaping roller 14 into their end position in which they describe the minimum working aperture for the tool when the shaping tool is moved axially upwards the levers 9 are pivoted by means of radially acting compression springs supported on an intermediate ring 20 so that the bending roller 13 and the shaping roller 14 are moved into a position in which they describe.