Thick sewing machine to send cloth to the location too front or too rely on, touch needle plate. Needle bar installation location is too high, needle holder touch the chassis. Approach: thick thread sewing machine to adjust the location of the feed dog, re-pin, adjust the needle bar height. Noise from the needle mechanism Description: Thick thread sewing machine needle bar, needle bar cover, small connecting rod and other serious friction sent too large. Small rod screw, needle rod crank screw loose. Thick-line sewing machines generally increase the shape of the pinhole image, so that people can quickly and accurately threading the needle, which has a thick line sewing machine with reasonable structure, convenient and practical, safe fly and other highlights.