receives the rear end of the needle 10 in order to also displace the needle in an axial direction during its own axial movement is provided with the intermediate ring 28 and pressure ring 29 at its forward end the rings are axially fixed in the recess of piston 7 but are rotatable about the axis of the latter the cutter disc 31 is located in the space between the two rings 28 and 29 and is fixedly mounted on the shaft 33 fastened onto the rear end of this shaft is a spur gear 39 which engages with another spur gear 40 mounted on a short intermediate shaft 41 the latter supports a bevel gear 42 which in turn is in operative engagement with two coaxial mutually oppositely located bevel gears 43 and 44 by means of bevel gear 44 there is branched off the drive of the to and fro moving motion of the piston 7 and namely the shaft 45 which carries bevel gear 44 extends through the housing forward portion 5 and at its outer end supports an eccentric disc 46 with the eccentric 47 the latter is contacted by a pusher rod 48 whose other end is linkably connected with a follower shaft 50 which extends through another aperture 49 formed in the housing forward portion 5 and.