SX-460D and SX-460E (Program-Control Model) is programmable semi-automatic sewing machine is used to sew the books which are gathered in gathering machine. Outstanding features includes: 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. PLC 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. As unstable feeding caused of different signature thickness is improved, so stability and working range (thin needles, dense needle sets) are greatly enhanced. It is widely used for paper-cover books or hard-cover books.