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We don't know what machine you have, but I'm guessing perhaps you dropped the feed dogs for darning. The feed dogs will still move backward, down, then forward, but in darning mode, they never rise above the needle plate to grab the fabric.
When you wind a bobbin, the thread usually goes through a "feeder" which creates a tiny bit of tension and a lot of direction. Make sure you have it through this. It is usually two circular discs, cupped, and back to back.
I'm going to guess on this one; if your stitches are even (no bunching or pulling), you might have a build up of thread somewhere in the machine. Take out the bobbin and, if possible, the bobbin casing and check for any tangled or loose threads. Second guess, check the feeder on top of the machine, thread may be working its way into and catching on that feeder... be very careful when threading through the feeder because thread will often catch. If neither of these 'fixes' work, might be time to take the machine in for a cleaning and tuneup.
machines can have single or double feeders. what type does yours have? feeding problems can usually be fixed by a good cleaning+ oiling of the feeder mechanism which regularly gets clogged with lint+threads/scrap threads. brush it out thoroughly with a stiff-bristled brush like an acid brush. apply 1 drop of oil to each feeder seen on the foot-plate. wipe excess oil off with a clean dry rag being sure not to get any debris from the rag caught in the feeder(s). other problem might be your bobbin tension. this is usually adjusted on the bobbin race with a very small screwdriver.
you can try changing the needle but it sounds like the machine is out of time & needs to be checked for timing issues & also to see if the needle bar is bent or damaged & to see if the feed dogs are out of time or just need a adjustment
I took off the foot, plate and where the bobbin is kept. Cleaned it out and there was a thread that was caught there. I put it back together and it worked fine.
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