53 connecting rod 54 rocking levers 55 and 57 connecting rod 58 pivot pin 32 and holder 29 to the top feed foot 6 which will therefore perform a corresponding feeding movement synchronously with the feeding movement of the top feed foot 6 the movement which is derived from the eccentric 13 is transmitted as a lifting movement to the holder 29 and consequently to the top feed foot 6 via the drive mechanism comprising the eccentric rod 14 the angle lever 15 the first lift connecting rod 16 the pin or common pivot 17 and the second lift connecting rod 28 consequently the top feed foot moves up and down in the correct cadence of its feeding movement when the angle lever 15 and the first lift connecting rod 16 swivel out see fig3 the rocker arm 18 is moving between the positions a b in a working zone that is selected so that the up and down movement at the bolt 17 is transmitted relatively slowly in the area of position a but relatively rapidly in the area of position b the lifting movement transmitted by the first lift connecting rod 16 to the holder 29 is decelerated by the rocker arm 18 in the area between the positions m 39 and a 39 and accelerated in the area between the positions m 39 and b 39 correspondingly the top feed foot 6 is moving slowly in the area of touch down on the fabric to be sewn but rapidly in the lift off area so that chatter effects during the touch down on the fabric to be sewn.