Sometimes the thread can get caught on the spool pin
or on the notch on the thread spool itself
on some machines the thread can come off the thread take up lever
it can also get caught in the top tension area
also check your needle to see if it's bent--roll on flat surface to see if it rolls correctly
there are 3 types of bad needles-bent
blunt--makes a popping sound when going thru fabric
damaged--broke tip
also check your bobbin area for lint or loose threads
check your bobbin to see if it's warped--I've come across some that were warped
check your top thread tension
SOURCE: Upper thread knots up with bobbin thread when sewing a stich
Thread test
Test your thread quality to start, thread your machine and LIFT the presser foot (this opens the tension disks). Pull your top thread straight back. If you feel no tension no mater how much thread you pull, your thread is good. If that your machine passes that test, then let me know, we can go to step 2. If not, try different spool of thread, same test until you get a smooth pull (tip: always check your thread this way when you thread your machine)
Step 2:
Pull on your threaded bobbin thread while it’s in the machine. Does it pull smooth and even? If so, go to step 3. If not, try a new bobbin (bobbins get bent or distorted if wound too tight).
Clean thoroughly in the hook and bobbin case area and oil 1-2 drop is all.
Thread knotting on the bobbin can be a lot of things but here's some guidance:
Tension:
If the thread is loose on the bottom of the fabric, it's actually the top thread is too loose. Think of 2 little elves playing tug of war in your machine, one on toip and one underneath. If you have loops on bottom, the top needs to pull harder (tighten top tension)
Jamming bobbin case:
If it is damaged from turning out of place once, it could have rough spots on it that makes the thread hang on it, and keeps making it turn over and over. Use a finger nail board (fine sanding) and smoothall rough spots. Then reset the bobbin case taking care to put the notch in the bobbin case in alignment with the proper spot in the machine (basically 5 o’clock) when looking at the round area where the bobbin case goes.
SOURCE: upper thread breaking on singer machine
Check that your bobbin thread is not wound too tightly or too loose. Also adjust your tension down a click at a time until it stops breaking, testing on scrap fabric. Singer provided manuals online. Look it up here: http://www.singerco.com/accessories/manuals.html
SOURCE: why does the thread keep breaking ?
The most common reason is the needle not inserted correctly (backwards), other causes can be burrs on the needle plate opening or burrs on the parts in the bobbin area.
SOURCE: Top thread keeps breaking during
This could be more than one issue, first I don't think you have the machine threaded correctly. Make sure when you thread that the thread is seated betweeen the tension disc on the top and also, make sure that you have properly but tin the bobin
SOURCE: Hi, there i have a problem
here are some suggestions
change the needle & make sure it's inserted correctly-flat side to the back, unless other wise stated in the operation manual
check the tension usually 3 or 4 is good
clean under the needle plate where the feed dogs are for lint
clean in the bobbin area for lint or loose threads
rethread the machine
check to make sure the bobbin is wound correctly & inserted correctly
check the thread to make sure it's not notty
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