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Re: singer solid state-bobbin part
Check your tension disks, with your presser foot up, and the tension dial on zero. Sometimes a piece of cotton breaks off between the tension disks and then prevents the disks to work properly. Also make sure when you thread the machine, the thread does go through the disks and over the take up lever. After you threaded the machine, before putting the thread through the eye of the needle, lower the presser foot and while pulling on the thread with your left hand, increase the tension with your right hand. Do it slowly and you should feel in difference in tension. If this is the case, your machine should work fine. Also use a ball-point needle on t shirt material. Good luck!
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It is the upper thread which pulls the bobbin thread up. If the bobbin thread is taken up to much, one solution is to loosen the upper thread -- but the upper thread is too loose. Therefore, the same problem needs to be combated from the bobbin side.
The thread from the bobbin should slide through a wedge. On that wedge should be a screw. It needs tightened. The bobbin thread should be tight as follows:
A fully loaded bobbin should tangle by the thread without falling. While dangling the bobbin by the thread, bounce the bobbin (yo-yo style). An easy tug should cause the bobbin to release an inch or two of thread and then the bobbin should stop falling on its own.
Once the bobbin tensioner is correct, you should be able to tighten the upper tensioner.
Is it getting tangled while you're spooling the bobbin on the top right corner of the Singer 1507 machine? If this is the case, you have to pull the thread through the top tiny hole in the bobbin, and hold on to the thread end. Then click the bobbin to the right to lock it in place, power up your machine. Keep holding the thread as you begin spooling the bobbin. Let go of the thread once the bobbin starts to spin a few rounds and the thread should not get tangled.
I had this same problem yesterday. I took apart the needle tension casing and now it doesn't get tangled or stop. The only thing is the bobbin is not sewing...it looks fine on the top, but the bottom is just loose loops.
* Un-thread your machine and remove your bobbin. Clean any loose thread or lint out of your bobbin case. Re-thread your machine, reinsert and re-thread your bobbin.
* Change your bobbin There could be a nick along the edge of your bobbin spool that’s catching your thread as you sew.
* When you start to sew a seam, grasp the upper and bobbin thread tails. Hold them back and out of the way as you sew your first couple of stitches. This will keep them from getting caught in your machine.