SEWING MACHINE AND METHOD FOR MACHINE SEWING

摘要

PURPOSE: A sewing machine is provided to reduce the generation of defect while reducing the loop being formed by a shuttle and to eliminate the defect of a stitch caused by the difference of tension by the abrasion being generated in an upper thread along the moving route of the upper thread and the excessive elastic tension. CONSTITUTION: A sewing machine for textile, leather or similar materials, of the type comprising means of forming the stitching by crossing upper and lower threads, is provided with two levers in order to allow the feeding of the upper thread to a shuttle and the recovery of the loop formed by the shuttle itself, together with means synchronized with the movement of the levers for periodically tensioning the upper thread.