Bobbin machine sewing

SOURCE: Needle & Bobbin out of sync

This description sounds like the machine is out of time. The needle should match up with a cut out section in the bottom of the bobbin area. If it is hitting, the timing has slipped, probably from sewing on a fabric that was too heavy for the machine.

SOURCE: bobbin case case keeps jamming

I am having somewhat the same problem with the exception that my needle did not break. I've cleaned and oil, but the bobbin case and projection positioned spring is not communicating to allow sewing to continue. The thread keeps jamming and the bobbin raises up the plate. So, what else am I to do?

SOURCE: singer quantum sewing machine won't pick up bobbin thread

Try changing your needle

SOURCE: singer quantum cxl sewing machine needle hitting metal

Your needle is probably to long or you need to open it more

SOURCE: Singer Sewing Machine model 9224. Bobbin thread

If you turn the handwheel, can you see a metal ring rotating around the outer edge of the bobbin case? If not rotating, broken gear or timing belt off.
If that ring is turning, remove the needle plate and bobbin case. As this ring now rotates, you will a finger on the ring that will pass behind the needle from right to left and it should catch the thread from the eye of the needle. If this finger, the "hook" passes above the eye, you have a timing problem.

Let me know.