I have a Janome sewing machine. It is so frustrating, the machine sews fine for approximately 3-4 inches and then the top thread breaks. I have cleaned the bobbin and changed the thread. I tried changing the tension on the top and this was in vain.
Answers: Sewing Machine Top Thread Keeps Breaking
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Check the tension; if its tight the thread will snap.
Changing the thread to a better quality can help too. I had this problem with thread I bought at walmart. I bought the same kind of thread (multi purpose) from a sewing store and you could visually see that this thread was better. Pretty much solved the problem.
Have you changed the needle? If not, try that. Sometimes a needle will get slightly bent and cause all kinds of trouble.
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