This machine's working table adopts high-strength independent bearing, which make the working table more stable. The height of worktable can be adjusted moving up and down. The rotary power supply is assembled in the machine. It is equipped with Singer-300U chain sewing head and microcomputer controlling system imported from Japan. It may change walking carriage's turning speed automatically, which make mattress sewing operation more convenient, faster and the finished turn-flange more beautiful.