The bobbin is not winding correctly. The thread is winding under the bobbin.
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: Singer 7444 trouble winding bobbin
It sounds like you don't have any tension on the thread when winding the bobbin. Make sure that you are running the thread through the tension disc on the top of the machine before going to the bobbin winder.
SOURCE: Singer 6267 self winding bobbin winds around shaft under
I just figured out why my bobbine was winding on shaft instead of on the bobbin. first of all make sure the bobbin is setting up high enough, top of bobbin needs to be a fraction higher then the bobbin shuttle, next check to make sure there are no burrs on the bobbin, then make sure that the thear is catching in the groove (**** in top) of the bobbin. In order to get mine to wind i had to lett the tread go down and then slip the thread in the groove. also remember to leave the pressure foot up do not put it down. let me know if this helps.
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.
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