Remove the needle and place it back in, the needle may have just slipped down out of place a little. Another thing to watch for is the foot that comes down to thread the needle may no longer be straight you might need to slowly push down the cartridge and watch to see if it tilts down to the left if it does you can carefully place your finger under the part that holds the thread and slightly lift it till its straight and continue to thread the needle. I have had that problem and just bent it back up carefully and no longer have that problem.
Hope that helps
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is the needle in the holder the correct way ( groove in the needle facing the thread )
Is the needle eye the correct size for the thread in use
remove it from auto tension setting and adjust it your self
make sure that the top thread is between the tension plates and not around the thread behind the plates
the thread tension is close to correct when you need a bit of a pull to pull it along to the needle
is the method of threading to the needle correct as any areas where the thread reverses direction will cause it to break
what do mean that the bobbin is constantly breaking or is it the bobbin thread that is breaking
have you got the thread down the case slot and under the flat spring correctly
the bobbin has to be inserted into the case in such a manner that when the thread is pulled , it flows down the slot freely as the bobbin turns
if the direction is wrong , the thread has to move across the sharp edge of the slot and will cut easily
If by "won't stitch" you mean that the top thread will not pick up the bottom thread, make sure you have the needle threaded properly. If the machine is a top loading bobbin, the thread goes in the needle from front to back. Same if it's a side loading bobbin (bobbin faces you as you sew). If it's a front loading bobbin (bobbin faces left of machine), the thread goes in the needle from left to right.
you thread the machine the normal way, using every thread guide, and if the automatic theader works it will thread the needle,
if the auto threader doesn't work, then it needs to be checked.
also make sure the needle is turned the correct way and inserted correctly into the needle holder.
that use to happen to me on my sewing machines, I would rethread the machine to make sure the thread is not caught on anything like the thread spool, or around anyone of the thread guides
also for both top & bottom threads, I keep a thread tail of 3 to 6 inches & before I start sewing I pull the thread behind the needle to the back of the machine & the I put the fabric under the foot & start sewing & now I don't have that problem anymore
The bottom thread won't come up? Make sure you: -Have the top threaded and through the eye of the needle (Basics are best to check, I've missed it once or twice! lol) -Are holding the tail of the top thread when you lower your needle and pull it back up (Hold it too tight though, and it might not grab) -Have an inch or two of "tail" or extra thread for the needle to grab on your bobbin thread (sometimes it won't grab if there's not much there) -Have all your lower pieces in and secure. (Mine tend to jump around if I'm not putting 'em in right) If it's still not grabbing, I'm not sure. Sorry, hope it helps.
Need more information. Is the auto thread component going down to the needle? Is it missing the needle hole? If this is the problem, make sure that the needle position is in the correct position by pushing the needle position button. This will bring the needle to correct height for the thread to be inserted. I had a problem similar and it was because the needle was not in the correct position. When using the thread insertion press it slowly and watch to see where the insertion part is going.