and a link 4 a needle bar 6 equipped with a needle 5 the needle bar is mounted in a rocker 8 swinging in a pivot 7 cooperating with the needle 5 is a shuttle not shown as well as a workpiece or a cloth feeder 9 which is fastened on a support 11 mounted below the stitch plate 10 of the sewing machine illustrated in fig4 the support 11 is connected with a forked crank 13 which is fastened on a rocking shaft 14 mounted in the housing 1 to drive the rocking shaft 14 an eccentric 16 whose eccentric rod 17 is articulated to a journal 18 is fastened on a shaft 15 in drive connection with the main shaft 2 in a ratio 1 1 on the journal 18 is mounted a link 19 which by means of a journal 20 is connected with a crank 21 fastened on the rocking shaft 14 laterally of the eccentric rod 17 there is fastened on journal 18 a link 22 which embraces a journal 24 carried by a crank 23 the effective length of link 19 equals the effective length of link 22 so that when the two journals 20.