Adjustment of needle and hook of lockstitch machine (double needle)

According to the quality of the sewing material and the thread used, when adjusting the height of the needle bar, insert a screwdriver through the panel hole, and loosen the fixing screw of the needle bar to adjust; the hook tip of the rotary hook will eat the same needle earlier, which is good for the thread take-up rate. But it is prone to jumping stitches; eating late, it can significantly improve the prevention of thread breakage, floating thread and jumping stitches, but it is not good for the take-up rate; the gap between the needle and the tip of the hook is too large, and jumping stitches will occur; needle and shuttle If the tips touch or collide, it will cause thread breakage and needle breakage. Adjust the relationship between the needle and the tip of the shuttle. When the needle bar rises from the bottom dead center to the lower engraved line, the tip of the shuttle is in line with the center line of the needle. Just loosen the hook fixing screw. can be adjusted; when adjusting the height of the upper end of the needle hole and the tip of the hook, adjust a small screw inside the hook to raise or lower the hook; The screw can move the hook left and right.