CXB**0D automatic sewing machine is used to sewing the books which are gathered in gathering machines. Outstanding features includes: stable performance.wide sewing range,brocken thread and brocken needle detector, no thread hooking, wrong signature detector,low noise,convinent operation, frequency speed control, safety design and etc. PLC program –control system is adopted in this machine. During operation, thread brocken, needle brocken, 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 needle, dense sets) are greatly enhanced. It is widely used for paper-cover books and hard-cover books.