with a looper thread guide mechanism of this invention is characterized by thread guide passages that are provided in the front face of the sewing machine body and that go from thread tension disks toward loopers by feeding looper thread along the thread guide passages the looper thread is easily guided from a thread supply source through the tension disks and a takeup toward the loopers thus the loopers can be threaded easily quickly and precisely application_number US 35788589 A description as shown in fig1 and 2 a sewing machine body 1 comprises an arm 2 a bed 3 and a base 4 a presser foot 6 is attached through a presser bar 5 to the arm 2 two vertically movable needles 8 are attached through a needle bar 7 to the arm 2 the bed 3 and the base 4 have an overlooper 9 and an under looper 10 with thread receiving eyes 9aand 10a in their respective tips the loopers 9 and 10 sew a chain stitch on known fabric in cooperation with the needles 8 as shown in fig3 several spool holders 11 stand on the rear end of the sewing machine body 1 needle threads nt and looper threads lt are supplied from known bobbins through a known thread guide toward the front of the sewing machine body 1 a pair of left and right needle thread guide channels 13 running continuously from the top down toward the lower front face of the arm 2 guide the needle thread nt.