is received by a thread eye 26 the thread eye 26 is part of an s shaped thread guide 27 which in addition to the thread eye 26 is provided with an intermediate thread eye 28 and a further thread eye 29 from the thread eye 29 the looper thread 22 extends through a further eye 30 formed at the base plate 2 and finally to a double chainstitch looper 31 according to fig4 the looper 31 is formed with a looper blade 32 extending oppositely to the feeding direction v the free end of the looper blade 32 forms a looper point 33 furthermore the looper blade 32 is provided with a not shown u shaped groove for guiding the looper thread 22 until leaving a bore 34 in the area of the looper point 33 the looper 31 is connected via a carrier 35 to a shaft 36 which extends parallelly with respect to the shaft 14 and is pivoted in the base plate 2 within the base plate 2 a not shown gear is provided for oscillatingly driving the looper 31 this gear is drivingly connected to the shaft 14 according to fig2 a connecting rod 39 is displaceably received in bearings 37 38 situated in the base plate 2 the connecting rod 39 extends parallelly with respect to the shafts 36 14 just as the shaft 36 the connecting rod 39 projects from the central area of the base plate 2 through a wall 40 into the working area of the needle 12 the connecting rod 39 is formed with an off set end 41 to which is secured a lever 42 the lever 42 extends in feeding direction v and is tilted slightly downwards.