ROOT WINDING BUTTON SEWING MACHINE

摘要

A root winding button sewing machine is provided to prevent authentically long thread from being exposed to a surface of the cloth after a foot winding process is passed by unbinding thread having proper length corresponding to the yarn consumption amount at each needle at the root winding process and a root winding process. A root winding button sewing machine comprises a yarn tension adjusting unit(9) and a yarn unbinding unit(10). The yarn tension adjusting unit induces and supplies sewing yarn drawn from the source of thread to a thread hole of the needle. The yarn unbinding unit unbinds the sewing yarn from thread supply source in order.