When using a sewing machine, the fabric is always wrinkled. Reasons: For a specific fabric, the stitches are too large; the needle tip is dull; the thread tension is not appropriate; the presser foot force is not enough; the fabric is too thin; the thread diameter or material difference of the upper thread and the bottom thread used Cause. You can reduce the stitch size; replace the needle; adjust the thread tension; increase the pressure of the presser foot; use a thin material backing paper; the upper thread and the bottom thread use the same quality and the same thread diameter.
The fabric is always wrinkled when sewing. There may be several reasons: tooth and presser foot failure or improper pressure adjustment, tooth screw loose, tooth position is too low, feed dog is too high, or the upper shaft crank and cam eccentric screw. The angle is wrong.
1.The tooth and the presser foot are malfunctioning or the pressure is improperly adjusted. The cloth moves forward by the cooperation of the cloth feeder and the presser foot. Therefore, when the above-mentioned irregular movement of the cloth occurs, it can be concluded that the tooth and the presser foot are malfunctioning or the pressure is improperly adjusted. For example, the presser foot pressure is too small. If the fabric is not pressed tightly, it will cause irregular movement. If the presser foot is too high to hold the clothing material, it will also cause the clothing material to move randomly or not at all.
2. When the tooth screw is loosened, the teeth will shake left and right, so that the clothing material cannot move forward regularly.
3. The tooth position is too low, and the movement of the cloth depends on the tooth transmission. When it appears that the clothing does not move at all, the only way to find faults on the teeth. If the tooth position is too low, it is impossible for the cloth to move forward.
4. The feeding teeth are too high and the plane of the teeth exposed on the needle plate is too high, and the teeth are always exposed outside the needle plate to move back and forth, causing the cloth to move back and forth.
5. The angle between the crank of the upper shaft and the cam eccentric screw is not right, so it can move forward rhythmically. It is completely driven by the cloth feeding cam. Because the cam itself is eccentric. Therefore, the teeth fork is moved back and forth, and the teeth fork drives the cloth feeding shaft and the teeth frame to promote the reciprocating movement of the teeth back and forth.
Extended data solution:
1. When adjusting the presser foot adjustment, first raise the presser foot wrench, loosen the guide frame screw, and then move the presser foot bar from top to bottom to adjust the distance between the presser foot and the needle plate to a height of 7-8 mm. Immediately tighten the screws before driving.
2. Adjust the tooth screw to remove the needle plate. Tighten the two teeth 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.
3. Adjust the position of the teeth, pull up the machine head, loosen the crank screw, and then gently lift the teeth frame with a screwdriver to make the feeding teeth face. Only 0.8-1 mm of the needle board is exposed. As long as it is adjusted to this position, the cloth can move normally. Finally tighten the screws.
4. When adjusting the height of the feed dog, loosen the screw of the lifting crank, and gently press the teeth with a screwdriver to lower the feed dog to the standard height, that is, the teeth are exposed to the size of the needle plate by 0.8-1 mm, and then tighten the crank Screw.
5. When the angle between the crank of the upper shaft and the cam eccentric screw is not adjusted correctly, pull down the back cover of the machine head to see the feed cam, insert a screwdriver into the housing, loosen the feed cam screw, and then Set the screw to the position of 260-300 with the crank of the upper shaft, and then tighten the cam screw.
