I just solved this problem with much persistence and a few possible causes. Mkae sure the thread is good quality and cant shred, at least until problem is fiwed. Unscrew plate behind bibbin and check if there is any caught thread, this happens after bottom thread has been looping. Remove any and replace, wind down the needle to check it goes in the centre of hole.
And probably the most important fix it; the tension;
Have your tension set to zero, thread the machine, and when the foot is DOWN, make sure it is very hard to pull the thread. It should be easy to pull the thread when the foot is UP. If the thread is easy both ways it has not caught correctly in the tension plates, thread it again (and again) until this happens. It shouldn't be possible to thread the machine without it going in the right place, but it is. And make sure when you rethread that the foot is UP until you thread the needle-
Another problem maker I also had to fix; ever so slightly bent needle.
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try changing the needle--use a needle according to the fabric being sewed if thin fabric is being sewed try using a stablizer rethread the machine top and bobbin--use every thread guide make sure the bobbin is inserted correctly and turned correctly in the bobbin case also try adjusting the top thread tension just a little
try changing the needle check the top thread tension to make sure it's not to loose rethread the machine top & bobbin, make sure the bobbin is wound correctly & inserted correctly into the machine make sure the thread has not come off the thread take up lever
Make sure you hold thread in back of the lowered presser foot when you begin stitching, and that the needle is piercing the fabric so that the fabric isn't slipping down into the feed dogs (under needle plate area).Hope this helps you out,alexlefebvre.Jimmy
Yes, it does. There are a couple of reasons the bobbin thread could be bunching up on the underside of the fabric. It could simply be that the machine needs cleaning. Take the bobbin assembly out, brush all the old lint out as best you can, reoil the machine once it's all clean, and make sure there aren't any little bits of thread caught in the bobbin assembly. Rethread the machine (carefully) and change the needle. This solves the problem usually--especially if the machine was sewing along fine and the problem develops suddenly. '
The other thing to check is your tension. It could be that the top tension is too loose. But different color thread in the top and in the bobbin, stitch a few inches (be sure to held the top and bobbin thread ends behind your needle as you start to stitch) and check. WIth the pressure foot down, adjust the tension, and stitch again. Keep stitching, checking, and adjusting until you see little if any bobbin thread on the top or top thread on the bobbin.
Another thing to reminder: use the appropriate thread and needle for the fabric you're sewing.
Let me know if this works, ok?