Causes of common difficulties – SINGER W7317 User Manual
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31. CAUSES OF COMMON DIFFICULTIES
BRËAKING OF THE UPPER THREAD:
2. Upper thread tension too tight.
1.
Incorrect threading.
3.
Faulty needle or needle set in incorrectly.
4.
Needle brushing against presser foot or other attachments.
5.
Upper thread too big for needle eye.
6. Starting the machine suddenly or with a jerk.
7. Starting the machine with the take up lever at its highest position.
2. Lower thread tension too tight.
BREAKING OF THE LOWER THREAD;
1. Incorrect threading of the bobbin case.
3.
Bobbin being wound too fully.
4.
Rough edge of hole in needle plate caused by improper needle action.
BREAKING OF THE NEEDLE;
1.
Pulling the fabric while machine is sewing thus causing the needle to strike the needle plate or shuttle hook.
2.
Using bent needle or incorrect setting.
SKIPPING STITCHES;
2. Needle inserted incorrectly.
4. Using wrong size needle.
1. Using bent or blunt needle.
3. Needle threaded improperly.
5. Pressure of presser foot insufficient, especially when sewing heavy material.
UNEVEN STITCHES;
1. Presser foot not resting evenly on material.
3.
Too short stitches used.
5.
Using too fine a needle with too coarse a thread.
2. Feed dog not being high enough.
4.
Pulling the cloth while the machine is sewing
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