in the direction of transport of the material x direction the knife guard 15 is developed in known manner within which guard the knife 22 travels upon the cutting of the pocket insert z direction the guard keeping both the flap 1 and the pocket bag blank 2 which rests on it away from the knife 22 thus preventing damage to said parts the course of production of a pocket opening with pocket bag will now be explained with reference to fig5 and 6 in this connection it should be pointed out that the sewing machine is substantially known and that some of the additional equipment such as the transfer devices sewing material clamp and gripper have been sold for a long time by the assignee of the present invention see the publication 34 durkopp amp adler katalog imb 39 88 34 referring to fig1 and 5 the workpiece 3 which is to be provided with the pocket opening is aligned by means of marking lights in region i in front in advance of the sewing machine 20 the flap 1 is placed on the application plate 32 which is arranged above the work plate 27 and aligned with the stop 42 one half of the pocket bag blank 2 is placed on the flap 1 it should be noticed that at this point in time the clamp 33 of the transfer device not shown in detail cannot contact both the flap 1 and the pocket bag blank 2 the piping strip 10 is placed and aligned on the piping strip applicator 34 and the other half of the pocket bag 2a is placed and aligned on the application plate 31.