The high-speed cylinder-bed multi-needle double chain stitch machine with self-contained air pump is developed for elastic waistband and circular seam production in apparel factories. Different from ordinary pneumatic models relying on external air compressors, this unit integrates an air pump inside the machine body to provide stable compressed air for all pneumatic actuators, including thread trimming, presser foot lifting and air blow thread sweeping. It removes complicated air piping, lowers workshop renovation investment and makes machine relocation much easier.
Its rigid cylinder cantilever is specially engineered for tubular seaming. Operators can slip pants, briefs or knit tubes onto the cylinder bed conveniently to finish waistbands, leg openings and cuffs in one pass. The precision differential feed mechanism independently controls front and rear feed dogs to balance tension on highly elastic fabrics, avoiding gathering, twisting or uneven stitching.
Adopting direct-drive servo transmission, the machine responds fast on start and stop, with low vibration and quiet operation even at the maximum speed of 4500 stitches per minute. The durable double chain stitch features superior elasticity and seam strength, suitable for stretch garments that require repeated stretching during wearing and washing.
Needle gauge, stitch length and sewing speed can be set on the digital control panel, supporting flexible changeover between different products. The closed automatic lubrication system minimizes oil leakage and fabric contamination. It is widely adopted in mass production lines for underwear, athletic wear, loungewear and elastic accessories.