1. Straight thread is not correct; check the height and orientation of the needle, so that when the needle moves down slightly in front of the needle plate hole; 3. Straight
Size; 6. Curved needle can not be caught on the left side of the straight needle needle ring, the next line on the right side of the line jump needle;
The needles needles broken, bending, etc .; replace the needle; 4. curved needle tip blunt; sandpaper and other grinding machine needle, or replace the curved needle; 5. suture tension is too large or too small; adjust the suture tension to the appropriate
Here to introduce some of the sewing machine sewing machine fault handling (before the reasons to determine, ";" after the maintenance method), hoping to provide you with reference.
