cam an adjustment device makes it possible to affect portions of the stitch contour with respect to their relative position the adjustment device has elements interposed between the control cam and the drive shaft for allowing a lateral displacement of the cam relatively to the drive shaft the amount and the angular position of lateral adjustment may be achieved without rotating the cam and or the drive shaft application_number US 17444880 A description referring to fig1 there is shown a sewing machine having a sewing head 1 the base plate 2 of which is connected to a plate 3 mounted by posts 4 to a frame 5 to the plate 3 there is displaceably supported a workpiece receiving device 7 by a linkage 6 for moving a workpiece 8 along a needle 9 of the sewing head 1 according to a predetermined seam contour the workpiece receiving device 7 substantially consists of a pressure plate 10 lowerable upon the base plate 2 by means of actuating elements not shown the pressure plate 10 is provided with a slot 11 which corresponds to the u shaped seam contour and which enables the needle 9 to penetrate the workpiece 8 the linkage 6 is journaled at a pivot 12 located at the frame 5 which also receives a gear 14 secured thereto by screws 13 fig3 the gear 14 has a vertical shaft 15 provided with an.