I have a Janome 360 Embroidery Machine. The thread keeps knotting up on the underneath side of the material causing my machine to stop. It was just serviced.
1.check the needle & see if it's bent--if so replace
2.lay the needle on a flat surface & roll the needle over if it doesn't roll true replace
3.check for blunt needle-if needle makes a popping sound when needle penetrates fabric
4.needle is not all way up in holder
on my mechanical sewing machine sometimes the threads come off the take up lever, that causes the thread to bunch up under something I'm working on
also check thread in bobbin
Always bring your thread to the top and hold before starting. Or make sure that your top thread is threaded properly as it sometimes jumps out, this causes bird nests underneath.
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