Not very experienced with sewing machines,so I do not know if my terminology is correct. The problem is when I try to sew the needle will move as if it is working for a few seconds, but the stitches are not completed. The upper thread is catching under the face plate and jamming up in the area of the bobbin. I have to take the area apart to remove the excess thread.
Make sure that you are using the correct bobbins and you have put the bobbin the right way around, make sure that you have threaded the machine correctly, and the needle is around the right way, these are a few things you can check.These are just a few simple things that a lot of inexerience sewers could check before going to a technician.
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Try winding it the opposite way you are doing it now in regards speed. If you are winding it on full speed, try winding the bobbin slower. If you are winding it slow, try faster. Also check that the thread is threading properly and is not catching somewhere, and also that the tension is correct. Finally, test with a thread that you have not experienced problems before.
try changing the needle rethread the machine top and bobbin make sure to use every thread guide make sure the top thread has not come off the thread take up lever--this can cause the sewing machine to jam if it's a top loading bobbin--take the bobbin out of the bobbin case and turn it around and reinsert the bobbin if it's a side or front loading bobbin take the bobbin and bobbin case out and make sure the bobbin is inserted correctly into the bobbin case and that the bobbin case is inserted correctly into the sewing machine.
Try these suggestions
1. Change needle
2. Rethread the machine--top --make sure to use every thread guide
3. Take the bobbin out --make sure it is inserted correctly into the bobbin
Case, & make sure the bobbin is turned the correct way
4. make sure the thread has not come off the thread take up lever
5. Clean under the needle plate & in the bobbin area for lint or threads
try changing the needle try rethreading the machine top & bobbin make sure the bobbin is inserted correctly into the bobbin case, some bobbins only go one way. clean under the needle plate & in the bobbin area for lint & threads
Start from the begining. Use your Instruction Book and make sure the machine is threaded correctly. Put in a new needle. Adjust the top tension to about halfway. Fit a fresh wound bobbin that does not have all sorts of different threads still wound on it(a bad habit with a lot of people). Make sure the bottom tension is correct. Make sure the bobbin is fitted corectly. Set the machine to do basic straight stitch(mid range stitch length). Try sewing and see if the problem is solved.
since you bought it used, if it is timing then a service tech can fix the problem.
& also since it is used having it serviced will give you peace of mind that everything is working correctly.
also after it's serviced, let them sew on it in your presence so you can see it's working properly, after all your paying for it to be fixed, & you should be allowed to see them sew on it after it's serviced.
check your needle to see if it's bent---roll on flat surface to see if it roll correctly
on some sewing machines when the thread comes off the thread take up lever it can cause the machine to jam
also if the bobbin thread becomes tangled it can jam
check the bobbin area for lint or loose threads
try having a top thread tail & bobbin thread tail of 3-4 inches
try holding the top thread tail & turn the handwheel on the right side on the machine manually & put the needle down into the bobbin area & see if the bobbin thread will pick up that way
Are you making sure that your pressure foot is up when you thread the upper thread? If it isn't then your thread is not seating correctly in the tension disks. It will then be loose and make a birds nest(mess) under what you are trying to sew. The other thing to check is which way you are putting the bobbin into the bobbin case, different machines do it different ways. Some want the thread to come out of the case in the same direction as the slot on the case and some want it to come off in the opposite direction.
Probably when your son broke the needle he knocked it out of time. You will need to have a sewing machine technician to repair that.