My bobbin wont wind

SOURCE: Bobbin won't wind

I have checked the gears underneath and see no missing teeth for the bobbin part. The bobbin "seat" does raise, but does not engage. Thanks

SOURCE: toyota sewing machinge 5500

If I understand the problem, the bobin winder has probably lost a rubber 'o' ring.

Unscrew the two top screws and remove the top cover. At the base of the bobin spindle is a metal disk that should have a rubber 'o' ring on it. This will perish over time and break off.

When the bobin winder is pushed sideways into the active position, this should contact the main turning handle thingy (that's a technical term) and be spun around. Check if the bobin 'o' ring is making contact or if it is even there at all. Any sewing machine repair shop (or good automotive store if you're desperate) will have a replacement.

SOURCE: Bobbin Winding problem

Pass the bitter end of the thread from the inside of the bobbin and up through the hole or slot in the bobbin to the top. Hold on to the thread as it turns to get it going.

SOURCE: when winding the bobbin the bobin wont spin ,the

Make sure you either tighten the knob or push in the wheel on the right end of the machine, at the hand feed wheel.

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.