71 39 with the springs 73 and 73 39 on the one hand and permit the turning strips 66 to be raised during crossing over thickened parts of the fabric on the other hand are arranged at the cylinders 68 and 68 39 on the opposite side of the pin 69 the spring pressure of the pressing system 72 and 72 39 is transmitted to the cylinders 68 and 68 39 via the bolt 74 to increase the action of the pressing force the bolt 74 may be designed as a piston and controlled compressed air may be admitted to the spring chamber 75 via the inlet 76 the turning strip 66 is provided with a slot 77 for sewing the cover seam 13 and is provided with a tapering chamfer 79 along the turning edge 78 to improve movement under the pocket flap 10 and the subsequent turning around the folding strip 80 the folding slide system 64 has a design similar to that of the turning slide system 63 the folding strip 80 is fastened to the cylinder clamping pieces 81 and 81 39 which are in turn connected to the piston rods of the cylinders or folding strip drive means 82 and 82 39 to form one unit the.