FORMING METHOD FOR BINDING HOLE BY BINDING MACHINE FOR SEWING MACHINE AND CORNER KNIFE DEVICE FOR BINDING MACHINE

摘要

PURPOSE:To finally connect cut ends by corner knives to a cut end by a center knife by a method wherein a cloth is cut in checkered pattern by corner knives from two outer parts toward the cut end of a linear cur part formed in a cloth by a center knife. CONSTITUTION:A part which is first collided with a cloth when corner knives 1 and 1 are vertically protruded upward from the back of a cloth is tip parts 3c and 3c of the corner knives 1 and 1. Thereby, positions where the cloth is pierced through by the tip parts 3c and 3c are not a cut end A of a cut part S but a position in the vicinity of an outer end B near a stitch. Further, in this case, inner blade parts 3a and 3a of the corner knives 1 and 1 are pointed to the direction of a cut part S formed by the center knife. In this way, with the gradual rise of a corner knife device, the inner blade parts 3a and 3a simultaneously widens a cut toward the cut part S by the center knife along V-shaped cut parts Y and Y', and finally the cuts by the corner knives are connected to the cut part S by the center knife.