I know this is probably not the answer but: are you sure the thread is coming off of the bobbin on the left side (bobbin in machine correctly), and when I first got my machine I tied to use the bobbins that I had on hand that fit my Singer machine. I had tons of problems with the "odd" bobbins that did not fit correctly into my machine. There is a VERY small size difference, but it does make a difference.
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Clean out the bobbin area thorougly. The bobbin must be the right size. If it is too tall it will cause the thread to wrap around the bobbin. Make sure you insert the bobbin and check to see if it is higher than the bobbin.
Most likely you have thread wrapped around and in the bobbin area of the machine that is not allowing the machine's handwheel or bobbin to turn completely. Open up the bottom of the machine and remove all the thread, etc. that does not belong.
try rethreading the machine--use EVERY thread guide
make sure the needle is inserted up into the needle holder and turned the right direction
make sure the bobbin is inserted correctly into the bobbin case and turned the right direction
clean under the needle plate and in the bobbin area for loose thread or lint
make sure thread has not come off the thread take up lever
also the jam could have caused the machine to jump time and needs a timing or a adjustment
try these suggestions rethread the machine top and bobbin, using every thread guide try a new needle--one for the fabric being sewed--make sure the needle is inserted correctly into the needle holder make sure the thread does not come off the thread take up lever try a different bobbin make sure the bobbin is turned the right way in the bobbin case clean under the needle plate and in the bobbin area for lint
try a new needle rethread the machine top and bobbin make sure the bobbin is not warped or damaged make sure the bobbin is inserted in to bobbin case correctly clean under the needle plate and in the bobbin area for lint if the problem still happens,, then it would be a good idea to have the machine checked for a timing problem
Try these suggestions
1. Change needle
2. Rethread the machine--top --make sure to use every thread guide
3. Take the bobbin out --make sure it is inserted correctly into the bobbin
Case, & make sure the bobbin is turned the correct way
4. make sure the thread has not come off the thread take up lever
5. Clean under the needle plate & in the bobbin area for lint or threads
try changing the needle try rethreading the machine top & bobbin make sure the bobbin is inserted correctly into the bobbin case, some bobbins only go one way. clean under the needle plate & in the bobbin area for lint & threads