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Re: Thread caught and messed up the tension spring.
You tension should always be between 3-5. There are several things that can cause a machine to not adjust properly. The most common is threading incorrectly. Another is pieces of thread caught in the tension assembly,usually between the metal tension discs. Try rethreading your machine with the presser foot in the up position.
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the tension screw for the bobbin thread is on the side of the bobbin carrier
that bit that you put the full bobbin in to clip it back onto the machine
t there is a small spring plate that you pull the bobbin thread under when you put the bobbin back in the carrier and you pull the thread down a slot and under that spring plate
the tension is adjusted by that small screw that holds that plate on
only very small adjustments make a lot of difference to the tension
don't touch any other screws or you will alter the needle /hook timing and that will put you a pickle
try tightening the needle thread tension as it appears to be too lose
try loosing of the bobbin thread tension a fraction as it may be to hard to pull out of the bobbin case under the spring
changing thread sizes and material thickness generally requires a tension adjustment of the threads
There is a screw on the bobbin case that can be used to adjust the tension. However, first I would check that there is not a thread or lint caught in the tension spring of the bobbin case. Use a stiff brush to clean bobbin case. Use a needle (or other sharp point tool), and check spring area for thread.
Check your top tension dial setting is on 5, as this sounds like the thread is not in tension fully so is looping up around the rotary hook and not being held back by the tension device. Is the pressure foot lowered (this turns the tension on) fully and is the thread through the tension discs correctly. Lower the pressure foot and pull the top thread from below the tension dial, it should feel firm to pull, if it comes out easy, its not undertension, device could be faulty and machine will need to be serviced.
Also, check that the bobbin case is fully inserted into the rotary hook in the correct position, bobbin is in and rotating the right way and thread is into the tension spring fully.
If you have the manual pull it out, and carefully check the threading up instructions and follow on your machine - it is probably one of these things causing the jamming.
check the needle to see if it's in backwards
check to see if the needle is bent
the thread might be hung up in the bobbin case(check area for lint or loose thread)
the tension spring could be bad-if this is the problem it would have to be replaced
check to see if it's threaded correctly(usually rethreading it is the best way to check)
check to see if the thread is caught on the spool pin or on the notch on the spool of thread it's self
make sure thread is not hung up on any of the guides
make sure the thread is not notty-if so replace
sometimes pieces of thread can be caught in the tension area
birdsnest refers to a mess of thread on the underside of fabric when you start sewing (after a few stitches all looks good). if this is the case and it is happening during embroidery, switch off jump stitch thread cutting.
if it happens at the start of normal sewing, either hold your needle thread when you start sewing or make sure the needle thread is under the presser foot and held by the presser foot when you start sewing. this way you will have an inch or so of thread on top of your fabric which you can trim instead of a mess underneath.
if there is a mess underneath for more than first few stitches, either your check spring in the needle tension area is set incorrectly, or your needle tension is set too loose (adjustable in sevice menu by tech only) or there is foreign matter caught in tension assembly preventing proper tension.
If you are having problems with the thread on the underside of the fabric, that is usually the upper tension. Check to make sure that it is threaded correctly. If so, make sure that the thread is inside the tension disc and that there are no pieces of thread caught in the tension. If it is threaded and there are no thread caught up in the tension assembly, adjust your tension dial to a slightly higher number. Do this until you get a good stitch.