The thread might be so tightly wound on the bobbin as to prevent its removal from the winder.But after this, my bobbin winder stopped working so I had to go to a sewing repair shop because I was unable to successfully fix the issue. Once I tried to wind a bobbin with an invisible thread to make a blind hem– hems are looking awesome with this thread! It is really invisible. Newer computerized machines are made (by the manufacturer) so they are difficult to take apart except by technicians.
In this case, the machine needs to be serviced. Something could be loose or broken inside, some dirt or particles that have made the winder stuck with friction.You can clean out the thread very carefully with tweezers (carefully unwind, just don’t cut this thread so it will not fall inside of the machine). This could keep the bobbin winder from spinning. Maybe you have gotten some thread wrapped around the pin that holds the bobbin. It can be hard to see under there, so a small flashlight helps. Make sure that the bobbin winder is engaged.Check if there are scratches or other defects on the bobbin.Check if the thread is passed through the bobbin winding guide correctly.Check if you aligned the groove in the bobbin with the spring on the bobbin winder shaft and pressed down on the bobbin until it snapped into place.Verify that you are using the correct size bobbins.
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