What you have going on is probably a bobbin problem. The knots are referred to as birds' nests and happen usually happen when your bobbin thread gets caught on something in the bobbin area. To be certain it's a bobbin problem, change your needle. Even if the needle looks fine, it could be just slightly bent and still look fine to the naked eye. If that doesn't solve the problem, take the fabric out of the sewing machine and turn the machine wheel by hand. Watch what happens thru the plastic window in the bobbin area, or if you don't have a plastic window leave the bobbin covering off. Is the thread catching somewhere and causing a bunch of thread to gather in the bobbin area? Be very careful when investigating in the bobbin casing/area-it's easy to chip things in there! Often times, a piece of something falls in there and can be pulled out with tweezers. Just as often, the bobbin casing is slightly tilted and needs to be straightened or has a chip in it and needs to be replaced. You can normally get a replacement on eBay, searching with your machine model number. Also, check out SewVacUSA. If you need help replacing the bobbin casing (it's easy, you just need to be careful), or if these solutions don't work, leave me a comment. I check back daily, so I'll get back to you within 24 hours normally. Leave me as much detail as possible and I'll do everything I can to help you!
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