wsmeador

Thank you all for your quick replies. Unfortunately, my wife and I got too busy with work and life to get back to the machine until now. Catskin's suggestion ended up being the solution. Flipping the bobbin worked even though it seemed to be the opposite of what the manuals showed. After the semester ended this week, we happened to be in our local sewing machine shop picking up some needles and thread and my wife described the issue to the well-seasoned machine repairman there and without a hesitation he said flip the bobbin. Convinced, she tried it and it sews like a champ.

Hello, The machine is properly threaded and makes near perfect stitches through, both multiple layers of interfaced cotton fabric, and leather. Test swatches are about 9 inches long. After about four passes (straight stitching, then lifting presser foot and changing direction) the machine begins to malfunction. Stitches are no longer forming properly and the bobbin tension has gone haywire. After cutting the thread and removing the bobbin case, it is apparent that the thread has come unthreaded from the bobbin case. We've cleaned and oiled the machine including removing and cleaning the shuttle driver and race to remove old thread dust and gummed oil. This problem started before removing the race. Attached is the test swatch top and underside. Any thoughts on why the thread would come unthreaded from the bobbin? Thanks! Scott