2. The main features of the heavy material sewing machine: the heavy material sewing machine adopts the upper and lower composite feeding and the cross-lifting mechanism of the presser foot to ensure that the upper and lower layers do not shift under any stitch length within the rated range, sewing slippery, viscous sewing material and special long products. The products are neat and the stitches are beautiful; the connecting rod thread take-up mechanism increases the spindle speed; the lower feeding shaft adopts sliding bearings, which reduces the noise and prolongs the service life.