1. When using a fully automatic sewing machine, the cloth is moved forward by the cooperation of the feeding dog and the presser foot. Therefore, when the clothing appears the above irregular movement, we can conclude that the feed dog and foot pressure has a fault or improper pressure regulation. If the pressure is too small, which is not tight cloth, it will cause irregular movement. At this point we just turn the regulator screw down to press the clothing. The pressure foot is too high, the flat seam machine press foot also can not press the clothing material, will also cause the clothing to move around arbitrarily, or not move around at all.
2. When the bottom thread of the trimming is short, first check the depth of the knife. The shallower the depth of the knife, the shorter the bottom thread. Secondly, check whether the buckle fork is fastened too tightly. The proper tension of the bottom thread is that the bottom thread can be pulled by hand after the buckle fork is buckled. In addition, check whether the bobbin case is deformed. After the bobbin case is deformed, it will affect the tension of the bottom thread when rotating.
3. There may be the following two reasons for the continuous cutting of the thread. It is possible that the knife is too shallow to cut the thread; the other may be that the line separation angle is too large or too small. You need to change the parameters and check whether the line separation angle is 310° ~315°.
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