By Deb L.
Here are the recent answer to this question.
By Frugal Sunnie 09/29/2013
Hiya! I'm a sewing teacher and self-taught sewing machine repair tech:)
That metal V looking thing is part of the bobbin case mechanism - you should be able to see it when you lift the bobbin spool from the bobbin case. Try not to disturb it, it can be a finicky little fellow. Consult the user guide (link to a free download at the Singer site follows) if you have disturbed it for a step-by-step guide to replacing it into the machine:
http://www.singerco.com/uploads/dow ... e675e38ed11eefeaa7d7a62f19f53a03.pdf
In the user guide, see also page 18 for basic troubleshooting info relating to your problem.
If that doesn't help, let me ask you a few questions:
Had you just wound a bobbin? Is it possible you pulled the filled bobbin off the winder pin without snapping the pin back to sewing mode position?
Have you been using metal bobbins? (I believe your machine uses a magnetic float bobbin system, using metal bobbins will over time cause your bobbin case to not engage with the needle to form a stitch - you'll need to take the machine to a qualified repair tech for replacement and rebalancing)
Have you been the correct class plastic bobbins? (Your machine should always be used with a 15 class. Other classes may look exactly the same and may even work 'ok' but there are very subtle variations that can cause problems over time.)
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