Automatic thread cutting apparatus for sewing machines

摘要

An automatic thread cutting apparatus for sewing machines to cut off a thread and hold the remaining portion of bottom yarns after sewing operation is completed includes a thread cutter, a linkage mechanism and a driver. The thread cutter includes a cutting blade and an upper and a lower fixed blade. The cutting blade has a first cutting section and a second cutting section. When the driver provides power to drive the linkage mechanism, the cutting blade is swung between the upper and lower fixed blades. The thread is cut off by the first cutting section and the bottom yarns are cut off by the second cutting section and held for use in the successive sewing operation without the need of redoing yarn threading.