Could be one of multiple problems. Be sure to use only fresh, good quality thread--no old or bargain bin threads. Check if there is a burr or rough spot somewhere in the bobbin thread path that is catching the thread and breaking it. (You can hand rotate the handwheel and watch the needle/thread action in the bobbin area and watch what is happening.) It could be that the bobbin thread tension is too tight, or the bobbin case may even need to be replaced (they do wear with use).
SOURCE: Janome Memory Craft 9500 Troubleshooting
The solution that I found last night was the thread tension. I have never touched the dial, only had it set on 'auto." When I started playing with it, I realized the top thread should be really easy to pull through the machine and it wasn't. I started turning the dial (to 3 or 4) and the thread slid through the machine perfectly. No more birds nest! I really thought it was bobbin initially because of the horrible sound it was making.
SOURCE: bobbin case case keeps jamming
I am having somewhat the same problem with the exception that my needle did not break. I've cleaned and oil, but the bobbin case and projection positioned spring is not communicating to allow sewing to continue. The thread keeps jamming and the bobbin raises up the plate. So, what else am I to do?
SOURCE: Bobbin problems
Are you using a size "A" (Class 15) bobbin? If you are using pre-wounds and they are not this size... they will jump around alot. The size of an "L" is very similar, but they are not as tall (height off the table when laying flat on the round side... like when sitting in the bobbin case.) There are tricks to using the thinner bobbins... See if you have a "taller" size "A"/Class 15 and if that corrects the trouble. [email protected]
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 Case Spins - in Huskystar C20
I had this problem when I first bought my machine. I took it in and they told me it was a recall problem. All the machines were having the same problem. They fixed it and I have not had the problem since. I bought mine at a Joanne fabrics. Hope this helps.
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