Sounds like bird nesting.
Remove the top thread.
ALWAYS RAISE the presseer foot and rethread from the beginning.
On the bobbin holder, there is a tiny adjuster you should be able to undo or do up with fingernail or small screwdriver cotton should be firm when pulled by hand not to loose or not to tight.
SOURCE: bobbin thread bunches up creating a tangled mess under the plate
This could either be due to the bobbin being wound too loosely, or the tension on the top thread is too loose. This just happened to me the other day, and I thought it was the bobbin thread, but then I put another bobbin in with a different color than the top thread (this is a huge help in diagnosing thread issues), and I was surprised to find that it was actually the top thread that was a big loopy mess on the underside of the fabric. I fixed it by tightening the tension on the top thread (quite a bit), and everything was fine.
SOURCE: janome straight stitch loose
I don't know if this is the right answer for any of you, but thought I'd put my 2 cents worth in. Often this can be the bobbin in backwards. It needs to unwind a certain way depending on the machine. I've heard a phrase for this: Mind your p's and q's which means some wind off to the right like a q, others to the left like a p. Mine has to unwind one way then be slipped backwards into a little slot or it does that loose bottom thread looping and bunching someone here mentioned. It seems everytime I get that problem I rethread the top thread 100 times before it clicks again and I remember it could be the bobbin thread. Either your manual will tell you the correct way, or you could experiment and try one or the other. Once you figure out whether you're a p or a q, mark it on your machien somewhere to remind yourself.
Good Luck and Happy Sewing!
SOURCE: bobbin
Hi Sally,
Don't forget to change your needle too. It may not look bent, but it probably is.
SOURCE: The bobbin thread is bunching on the under side of
Make sure that you use the F foot when using decorative stitches.
The stitch balance my be off. Remove the accessory bin and you will see a large plastic screw with a + and a - and an arrow. Using a coin, turn the arrow to the center and test. Turn the arrow towards the + to stretch the pattern out.
If this doesn't work, it must me calibrated internally and requires an experience hand.
SOURCE: Babylock sewing machine, upper thread is bunching
the tension is wronge has the lower bobbin case been unwound and refilled)(check that this is threaded right as well)
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