AUTOMATIC THREAD CUTTING DEVICE OF OVERLOCK STITCH SEWING MACHINE

摘要

An automatic thread cutting device of an overlock stitch sewing machine is revealed. A suction pipe is disposed on one side of a cutlery working end of a thread cutting set and is connected to a pneumatic control device. The thread cutting set is driven by an independent power source to perform a shearing action. The structure of driving components is simple so that the component failure rate is reduced and noise generated is lowered. A blow pipe is arranged at the other side of the cutlery working end of the thread cutting set and is connected to a pneumatic control device. By the pneumatic control device the suction pipe and the blow pipe a suction force and a blowing force are generated at the cutlery working end so as to send sewing threads into the cutlery working end to be cut off.