In the process of using the Jeans Sewing Machine to sew clothing, sometimes the speed of the clothing is not uniform, and the stitches are long and short. Clothing material moves forward by the cooperation of feeding teeth and presser foot. Therefore, when the above-mentioned irregular movement occurs in the clothing material, it can be concluded that the teeth and presser foot have malfunctioned or the pressure is not adjusted properly. For example, the presser foot pressure is too low. If the fabric is not pressed tightly, it will cause irregular movement. At this time, just turn the pressure adjusting screw downward to compress the clothing material. If the presser foot is too high, it will not be able to press the material, and it will also cause the material to move randomly or not at all. When adjusting, first lift the presser foot wrench, loosen the screw of the guide frame, and then move the presser foot lever from top to bottom, so that After adjusting the distance between the presser foot and the needle plate to a height of 7-8 mm, tighten the screws immediately before driving.

Another reason is that the tooth screws are loose, causing the teeth to shake from side to side during operation, so that the clothing cannot move forward regularly. The solution is to remove the needle plate. Tighten the two tooth screws. After tightening, install the needle plate and check whether the two sides of the teeth rub against the edge of the needle plate groove. If there