guide rods 51 with the sliding bearings 52 is likewise mounted pivotably on the tilt axle 47 at the rear end of this carrier 54 there is formed a downwardly extending arm 55 which is arranged essentially inside the lever arm 46 engaging on the lower end of this arm 55 is a tilt drive 56 by means of which the zip fastener receiving carrier 54 can be pivoted about the tilt axle 47 the tilt drive 56 is designed as a pneumatic three position piston cylinder drive which can be positioned in positions corresponding to the three lower positions of the folding device 50 in the carrier 54 there are arranged as can be seen in fig2 and 3 two guide rods 57 which are parallel to one another and extend essentially in the y direction and on which a reception 58 is mounted so as to be slidable by means of sliding bearings 59 the reception 58 is displaced by way of a reception displacing drive 60 which is arranged in the receiving carrier 54 and can be designed identically to the displacing drive 53 displacement takes place between two end positions of which the extended position is shown on the left in fig3 whereas the retracted position is indicated on the right in fig3 by a part of the sliding bearing 59 being represented by dot dash lines the zip fastener reception 58 has a bearing plate 61 which extends longitudinally essentially in the y direction and which.