In our previous article "How to Fix Common Sewing Machine Problems", we introduced how to solve the question from the feeding fault and working fault. In this article, we will focus on how to solve small problems in Stitching fault and Needle breakage fault for your reference.
Stitching fault
1. The surface line is floating
Analysis: The pressure of the thread clamp is too small.
Treatment: tighten the clamping thread, increase the tension of cotton thread.
2. Bottom thread is floating
Analysis: the bobbin spring is too loose.
Treatment: tighten the bobbin spring screws, increase the bottom thread tension.
3. Stitch length sometimes long and sometimes short
Analysis: Presser foot pressure is too small.
Treatment: Tighten the presser screw.
4. Each needle under the sewing material has a thread cover, which is like a towel thread cover.
Analysis: The action of feeding cloth and picking thread is not in line with each other.
Treatment: Adjust the cloth feeding cam screw so that the cloth feeding and thread picking actions are in harmony.
Needle breakage fault
1. Sewing thick material needle breakage
Analysis: The needle is too thin or bent, the thickness of the sewing material is not uniform, the needle bar is too large.
Treatment: change the new thick needle, adapt to slow down the sewing speed and help feed the material by hand, change the new needle bar or needle bar set.
2. The short stitch does not break the needle, the long stitch breaks the needle.
Analysis: the action of the cloth feed tooth lags, the cloth feed tooth is unqualified, the needle touches the back end of the cloth feed tooth and the needle breaks.
Treatment: should adjust the positioning of the cloth feeding cam, appropriate shortening of the needle distance or change the new cloth feeding teeth.
3. Needle broken under the needle plate
Analysis: the needle position is low, the needle touches the shuttle, the shuttle bed is not installed, the tip of the shuttle touches the needle, the shuttle bracket and the needle end of the gap between the two sides is too small or too large, the shuttle bracket touches the needle or the loss of the role of needle protection.
Treatment: adjust the position of the needle bar or needle, reload the shuttle, adjust the shuttle butt and the needle end gap.
4. Needle breakage on the needle plate
Analysis: the hand pulls the sewing material too violently, resulting in the needle bending, the presser foot screw is loose, resulting in the presser foot skewed to touch the needle, the cloth feeding cam displacement causes the sewing material to pull off the needle, there are hard objects in the sewing material so that the needle touches the broken.
Treatment: Strengthen the operation practice, adjust the presser foot to tighten the screw, adjust the position of the cloth feeding cam screw.