It does not happen while winding the bobbin thread
SOURCE: Problem with winding thread onto
first you must make sure the winder shaft is turning by moving it to the right a little and see if you can turn it by hand.
If it is turning ok then there is a rubber ring on the other end of the winder shaft and it should come in contact with the drive which turnes it ,if it is worn it might need a new rubber.
SOURCE: Bobbin won't wind Singer 7422
Your problem lies with the main shaft that is to tight to release the bobbin winder mechanism, because of old grease and oil becoming sticky. A short term solution will be to remove the needle, in order not to hurt you, and then hold on to the needle bar with your left hand, while engaging the bobbin lever with your left hand. This will prevent the main shaft to rotate and your winder should work. In the long term, take it to your dealer to clean the oil and grease. You will not be able to open the machine casing yourselve, as you might damage the casing and or electronics.
Good luck!
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: Bobbin is not winding correctly
slide plate may be worn - i had the same problem. try holding down the center of the bobbin with a pin while slide plate is in the winding position.
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.
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