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Re: No lower thread
Make sure your needle is in correctly...flat side to the back and that it is not bent or damaged. Make sure to double check the thread is going through the tension in the bobbin case before inserting the case into the machine.
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Are you saying that the upper thread is not pulling the bobbin thread up to the top?
Install a brand new needle.
Remove the thread. RAISE the presser foot and rethread from the beginning--allows the thread to seat completely in the upper tension disk.
Check that the bobbin thread is inserted in the bobbin case facing the correct direction and that the bobbin case is threaded correctly through the bobbin case tension. Be sure to leave at least a 6" tail of thread on both the upper and lower threads.
If it is still not picking up the bobbin thread, the bobbin case may be defective/malfunctioning or your machine probably needs professional service.
Doesn't pick up bobbin thread
1. The bobbin may be in backwards.
2. The bobbin thread & top thread need to be pulled to the back before starting the stitching
3. You need a ballpoint rather than universal needle to sew on t-shirt knits.
4. the needle is in the machine backwards
5. Make sure the needle is the correct one for the fabric being sewed
6. Needle inserted wrong in the needle holder
7. Warped needle
8. Warped bobbin
9. Also could be a timing problem
There is not much of a secret to inserting a bobbin in a sewing machine. A couple of things to check, the thread from the bobbin should be pulled through the slot of the carrier, and make sure the thread comes through the sewing hole by manually lowering the threaded needle and then lifting it out of the hole again after it has picked up the thread from the bobbin. The video link posted below is useful if you have a Brother sewing machine.
If the stitching is still not right then check that the needle is fully inserted in its housing. (Push the needle up as far as it will go then tighten the screw.) How to wind and install the bobbin and thread the sewing machine PART 2...
You should do this by putting very slight pressure on the foot control (or turning the wheel by hand) with the machine's pressure foot up. Then pull the threads by hand to the back of the machine. If the upper thread does not catch the lower thread then the bobbin is not correctly threaded in the bobbin case.
try changing the needle try rethreading the machine top and bobbin make sure to use every thread guide-this is improtant for the thread tension make sure the bobbin is turned correctly in the bobbin case also could be a problem with the computer motherboard or there could be a problem with the timing
Drop bobbin in carrier such that the thread and bobbin form "P". When you pull on thread the bobbin unwinds counter clockwise. Lay loose thread in groove on plate coming toward front of machine. Replace cover. Rotate hand wheel towards you to pick up thread. Pull upper and lower threads to rear of machine under presser foot.
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 bobbin to make sure it's not warped
check the needle to make sure it's not bent-roll on flat surface to see if it roll correctly
make sure the bobbin is in the bobbin case correctly
make sure you have a 3 to 4 inch tail on the bobbin-so the upper thread can pick it up easily
make sure you have a 3 to 4 inch tail on upper thread also as it picks up the lower thread
or you can hold the upper thread with your hand to the side of the machine & use the handwheel to lower the needle as it picks up the lower thread
pull both threads to the back behind the needle
make sure there is no lint or loose threads in the bobbin area