Nesting Bobbin Thread
 

I have been using a Singer 15-91 and a Singer 201 for quilting Lapthrows. In the last several weeks, I notice that the top spool will jerk and if you continue to sew thinking the thread is wound too tightly in that spot then on the underneath side the bobbin thread is nesting. I have tried adjusting the pressure on the foot, changing the thread so that the bobbin is filled from the spool that is on top of the machine. Sometimes it will sew several rows before this happens. I really like sewing on these two machines but this is getting very frustrating. I am using a walking foot. I haven't tried piecing on these machines because I use the featherweight or one of the 301's and sometimes I use the new Singer 160 for that. Can anyone help me.

Don't know what type of thread you are using, but if it is on a small spool: See if the thread is not winding on the spool holder as it is coming off the spool; check to see if it is not getting caught on the "nick" on the spool edge that you put the end of the thread in when storing; to remedy, turn spool around. Something is hindering the top spool from spinning and that is making it jerk.

You can try to use a thread holder (some make their own. Check on some threads on this board) That might help.

Good luck.

When my machine acts like that, it usually means either the spool of thread is feeding off the wrong direction or the bobbin is in feeding from the wrong direction. Good luck.

Are you using a spool cap? That will keep the thread from catching on the spool end and causing the jerking. It happens mostly when you are using a spool that has the slit to hold the thread end. A spool cap will guide the thread away from the spool. They are inexpensive. The caps weren't needed with the wooden spools used at that time.

When my 15-91 did that it was one of 4 things, wrong bobbin, thread coming off the bobbin in the wrong direction or the thread on the bobbin is too tight or too loose, or the top thread has jumped out of one of the guides.