Thread Sewing Machine is used to sew the signatures and create a Sewn Book Blocks. Outstanding features include ,stable performance, wide sewing range, broken thread and broken needle detector, no-thread hooking, wrong signature detector, low noise, convenient operation, frequency speed control, safety design and etc. Program-control system is adopted in this machine. During operation, thread broken, needle broken, no-thread hooking, excessive signature or lack signature can be detected and reported.