The reason and treatment method of jumper at the beginning of sewing of Juki 3200S electronic buttonhole machine

First, check whether the needle and thread are selected correctly, whether the needle is installed correctly, whether the threading method and thread tension are correct, and whether the needle and looper are damaged; If there is any debris, it should be removed in time; check whether the installation position of the left and right distributors is correct; the correction method is to move the left distributor so that the center of the second part of the front end is consistent with the center of the bottom thread hole of the left looper, and then loosen the distributor stopper block, adjust the stopper of the distributor, and fix it after adjustment; move the right distributor to make the inner ridgeline (needle side) of the right distributor and the right looper consistent, and then adjust the stopper of the distributor; the looper is damaged or The gap between the presser foot head and the needle drop is too large, check and repair or replace the looper; adjust the gap between the presser foot head and the needle drop, loosen the fixing screw of the presser foot crank seat, and move the presser foot crank to the direction A. The gap between the presser foot head and the needle drop point becomes smaller. After adjustment, tighten the presser foot crank seat fixing screw.