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Feeding fault
1.Sewing material wrinkles
Analysis: Broken needle tip, excessive thread tension, improper adjustment of the differential mechanism.
Treatment: Replace the needle with a new one, loosen the bobbin spring screw and readjust the differential mechanism.
2. The underside of the sewing material is "gnawed through" to form the teeth marks.
Analysis: The tip of the cloth feeding teeth is too sharp, and the pressure of the presser foot is too high.
Treatment: Use an oil stone to polish the tip of the cloth feed teeth, and loosen the presser foot adjusting screw.
3. There are threads under the sewing material, and the sound of interrupting fiber when sewing.
Analysis: The needle is broken or too blunt.
Treatment: Replace the needle with a new one.
4. Sewing material back and forth
Analysis: The cloth feeding tooth is too high.
Treatment: Adjust the cloth feeding teeth.
5. Sewing material backward cannot sew
Analysis: The cloth feeding cam is shifted.
Treatment: Adjust the position of the feeding cam.
6. Sewing material irregularly slanting away
Analysis: The fabric feeding teeth are mounted crookedly or the screws of the fabric feeding teeth are loosened.
Treatment: Correct the cloth feeding teeth and tighten the cloth feeding screws.
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Working fault
1. Head rotation stagnation
Analysis: add the wrong lubricant, especially the filling of vegetable oil; too much dirt in the shuttle bed; connecting rod screws, cone screws installed too tight.
Treatment: rinse with paraffin, refill the sewing machine oil; cleaning the shuttle bed; loosen the screws to ensure that the gap.
2. When sending a turn, half a circle of stagnation, half a circle of light slip or every turn of a circle there is a stagnation point
Analysis: the shuttle bed wheel has a thread, running not only half a circle stagnation and accompanied by violent shaking and noise; send the fabric teeth position is high or the teeth of the dirt accumulated in the seam, so that send the fabric teeth rise with the needle plate collision.
Treatment: clean up the bobbin, and add a little sewing machine oil; cleaning or lowering the cloth feed teeth; replacement or straightening of the needle bar.
3. The machine head is stuck and cannot be moved
Analysis: The position of the cloth feeding teeth is too far forward or too far back, touching the needle plate; needle bar installation position is too high, the needle clip touching the machine case.
Treatment: adjust the position of the cloth feed teeth, re-needle, adjust the height of the needle bar.
4. Noise from the needle mechanism
Analysis: needle bar, needle bar sleeve, small rod and other wear and tear to send too large; small rod screws, needle bar crank screws loose.
Treatment: replace the new needle bar, needle bar sleeve, small connecting rod and other accessories; re-tighten the small connecting rod screws, needle bar crank screws loose.
5. Noise from the feeding mechanism
Analysis: large tip top cone screw wear or loose, feed cloth teeth touch the needle plate, needle distance adjustment mechanism is loose.
Treatment: Grinding or readjusting the big pointed cone screw, readjusting the cloth feeding teeth touching the needle plate, readjusting or tightening the screw of the needle pitch adjustment mechanism.
6. Noise from the shuttle mechanism
Analysis: Pendulum shuttle and shuttle bed wear and tear resulting in a large gap between the pendulum shuttle and the pendulum shuttle bracket gap is too large to produce impact.
Treatment: Replace the new shuttle and shuttle bed, etc., adjust the distance or replace the new shuttle and shuttle butt.