thread guide 24 is adjusted in position along the arc locus of the oscillating thread guide or when the thread guide in adjusted in position along the chord of the arc locus of the oscillating thread guide the deviation of the locus of the eyelet by the adjustment of thread guide and the locus of the cam part of the oscillating thread guide may be reduced and in the latter case in particular the deviation of the two can be eliminated so that the draw amount of the thread can be varied according to the kind of cloth and thread without varying the thread handling action this reason is explained in detail in the embodiments shown below when placing the thread guide at the reference position too aside from the method of matching the contours of both thread guides for example one thread guide may be provided with a line or step and the contour of the other thread guide may be matched to it anyway it is desired to mark the reference portions with a dot circle triangle arrow or color so as to be distinguished easily to the arm 11a of the sewing machine 11 also as shown in fig2 a thread guide 42 for overedge stitches.