pushing wheel 47 which is mounted in a ball bearing in the known manner and has an inner part with an axle stub 48 the axle stub is received in a bore in an arm 30a of the support 30 and can be fixed with a screw 49 after adjustment in the axial direction the height of the pushing wheel 47 can be adjusted relative to a needle plate 50 which closes off the column 2 in the upward direction and through which the pushing wheel 47 extends through a slot 50a by rotating the eccentric 31 by means of the slot 36 in parallel to the slot 50a the needle plate 50 is provided with a stitch slot 50b for the passage of the needle 13 the support 30 is firmly clamped to the column 2 by a screw 51 which is screwed into its upper part and extends through a slot 52 in the column 2 a shaft 53 extending vertically is loosely mounted in the head 5 of the sewing machine a clamping piece 54 is fastened by screws on the shaft 53 the clamping piece has a radial bore into which a pin 55 is inserted a coupling piece 56 is loosely mounted on the shaft 53 a web 57 which is located on the side of the coupling piece 56 extends through a slot in the head 5 and secures the clamping piece 56 against rotation the lower area of the coupling piece 56 is designed as an annular cutout and thus it surrounds the clamping piece 54 the annular cutout has a recess 59.