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Grasp the threads and hold them down when you start your seam. If it still happens make sure your thread is seated into your upper tension mechanisms. If that still isn't solving your problem... CLEAN between the tension discs with some sturdy fabric folded in half. (wax build up from threads can cause issues)
1. make sure your machine is threaded right.2. set the tension between 3 and 4 and play with the tension as you need it to adjust it.3. make sure the bobbin is threaded right.make sure to visit the site below; it has solutions to multiple problems and instructions how to thread the needle or bobbin. Good luck.htt://Fix Looping/Knotting Thread Fix Knotting/Bunching Thread Looping Bunching & Knotting Thread
If I'm understanding the problem right it sounds like you have no tension on the bobbin. Take it out and see if the thread has any resistance when you pull it out. If you hold it up by thel thread and let it dangle and it just drops to the floor the tension isn't right. Check and make sure it is threaded correctly and tighten the tension. Test it again and when you dangle it, it should drop a bit with resistance when you hold it by the thread.
Also check that the top tension isn't too tight, but in this case it is more likely that the bobbin is too loose. And check to see if the dogfeed (the teeth that comes through the plate opening under the needle) is up and moving the material through the presser foot. If the material isn't moving at all it will sort of stitch "in one place" which will give you a bunch of threads all knotted up underneath. If those underneath threads are loopy that is a sign the bobbin thread is too loose (tension too loose)
When loading the bobbin there is most likely not enough tension on the thread letting it overlap incorrectly. Try wrapping thread around a tensioner when filling and that should help. That way the bobbin is rolled as tight as the tension on the upper thread when sewing.
First ensure that your bobbin is threaded correctly. Most drop in style bobbins the thread will feed off in a clockwise motion. Also make sure to only move the hand wheel (on the right) toward you (counter clockwise). When you begin sewing ensure that you start with the needle in the fabric and when you end that your needle is in the highest position.