Try a new needle. If that doesn't do it, then the timing is off. You might need a repair shop to fix it.
SOURCE: Bobbin thread not being picked up
This unfortunately sounds dismally like a timing problem. When a sewing machine makes a sudden mechanical stop as when a needle is bent slightly and hits the needle plate, sometimes the other machine bits revolve along further causing the needle to be introduced into the hook either to early or to late to catch the thread.
To test this, remove the thread, the needle plate and and the bobbin case. Replace the needle with a brand new one. Yes, again. Revolve the machine by hand via the balance wheel and watch closely as the needle goes into the hook region allow it to it move down and then just start to move up. If the tip of the hook is not pretty close to right behind the needle than it is more than likely a timing problem.
If the tip of the hook is behind the needle in the scarf (the slight hollow on the back of the needle) than it is not timing. Thread the machine normally like it is and watch what happens as you manually turn the machine via the balance wheel. The thread should catch and be pulled around the hook and let go.
Try this and then either you figured it out the problem or contact me again. Either way please vote. Thanks
SOURCE: can't get top thread to pull up bobbin thread on my sewing machine
Try the regular first steps of change the needle make sure the flat side of the needle goes to the back and is all the way in. From there try rethreading the machine from scratch. If none of these work it may be the timing from the needle to the hook of the machine but start easy first.
SOURCE: needle thread will not pick up bobbin thread
Needle may need to be changed. Be sure it is the correct needle for the machine.
SOURCE: Singer CG 550 Top thread keeps wraping around the bobbin and jam
Have you checked the top thread is correctly placed in the spring of the bobbin case?
SOURCE: Top thread won't pick up the bobbin thread
re insert the needle, maybe you did not put the needle up as far as it is to go. Make sure the flat side of the needle is to the back of the machine. Without any thread in the machine hand turn the wheel and look to see if the hook of your bobbin would/could catch the thread (to see if timing is right)
then thread the machine and hand turn the wheel and see what it is doing.
Your timing might be off, but I do not think that is likely. Though it is possible that when the needle fell out, it hit something hard, broke, and pushed the machine out of timing. then you need to bring it in.
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