Such machinery have adopted the unique design and feature smooth and beautiful appearance. The adoption of the double-needle puncturing mechanism, the sliding bar thread-taking-up mechanism and the vertical rotating hook thread-hooking mechanism can form the two-row double-thread lockstitches. The computer-control system can function in automatic needle stopping and automatic thread cutting. The adoption of synchronous feeding by the needle bar swing and the feed dog can ensure the even stitches and prevent the slippage of sewing materials. The upper and lower shafts have adopted the ball bearings and the timing belts for driving. The driving is stable with a small vibration and low noise. Such machinery are applicable to the sewing of jeans, uniforms and overcoats
