the looptaker needle looper assembly work material and thread manipulating members indicating the positions thereof at the moment of loop seizure fig8 is a plan view of the looptaker and bobbin case supported therein in the process of loop expansion and casting about the bobbin case fig9 is a perspective view similar to fig7 shown however after grasping an upper thread and during transit of the needle looper assembly to a lowermost position and fig1 is a plan view of the presser foot needle looper assembly and thread manipulating members to show the action thereof which directs the upper thread into the hook of the needle looper assembly with reference to the drawings the invention is incorporated in a sewing machine having a frame shown in phantom and including a hollow work supporting bed 10 with a hollow standard 11 rising from one end thereof and terminating at its upper end in a hollow bracket arm 12 that extends laterally over the work supporting bed a main shaft 13 is rotatably mounted within the hollow bracket arm 12 and extends longitudinally therethrough the main shaft 13 has a crank 15 formed in an intermediate portion thereof with a cam surface thereon a pitman 16 is pivotably mounted in the hollow.