In the process of using the sewing machine sewing cloth, sometimes cloth movement speed uneven stitch length short irregularities.

　　For this failure phenomenon, the author analyzes cloth move around thanks to send the dog and presser foot with forward transport, when clothing such irregular movement, we can conclude that the teeth and presser foot fault or pressure improperly adjusted. The presser foot pressure is too low, the pressure is not tight fabric, it will cause to move around irregular. At this time we just put down the regulator screw rotating, to press the cloth.

　　In addition, the presser foot is too high, lockstitch sewing machine the same presser foot can not suppress the cloth, can also cause any clothing walk around, or do not move around. After adjustment, we should first get a presser foot wrench lift, loosen the screws of the guide bracket, then impress presser foot lever from the top down, so that the distance of the presser foot and the needle plate is adjusted to the height of 7mm-8mm, then screw tighten, and then drive to use.

　　It is worth noting that there is a reason: lockstitch sewing machine teeth loose screws, running around the teeth caused shaking, so that the cloth can not be moved forward rules. In this regard, we proposed approach: we will remove the lockstitch sewing machine needle plate, and tighten the screws of the two teeth. Tighten the needle plate is installed, check the teeth on both sides, one with the edge of the needle plate slot conflicts. Friction caused by the noise and the machine re-phenomenon, this time only lifted the needle plate, loosen teeth screws, adjust the tooth position to the middle of the needle plate slot, tighten teeth screw, and then loaded the needle plate.