Everything was fine. Then my machine started knocking and the bobbin thread jamming in the bobbin area and on the fabric.I cleaned the bobbin race area and added machine oil, as the guide book suggested. It didn't help.
Have you tried a new needle
Correct needle insertion is mandatory for proper use of your sewing machine.
Raise the needle bar to the highest point, then loosen the needle clamp screw to remove the old needle.
Place the new needle in the needle clamp with the flat side of the needle facing the back, (round needle, the groove in the needle should face away from the shaft).
Push the needle all the way up as far as it will go. Then tighten the needle clamp screw.
check the bobbin to make sure it's not damaged
rethread the machine top & bobbin
clean under the needle plate & in the bobbin area for lint or threads
also make sure the top thread doesn't come off the thread take up
lever
SOURCE: Thread jamming on the bottom of fabric
The tension must have gotten loose during use, try adjust the tension on the thread, and the bobbin casing.
SOURCE: On my Singer Scholastic, the thread jams in the bobbin area
It sounds like it is not threaded properly through the tension disc. Try rethreading and make sure the presser foot lever is in the up position. If it continues, once threaded and with the presser foot down, pull on the thread through the needle. If it has resistance, it is threaded properly. If it pulls easily then there is a problem in the tension area. Check to see if there are peices of thread broke off in between the tension disc.
SOURCE: Singer 7470 thread getting caught on hook
Take out the bobbin and parts again and check there is nothing caught in that area. Ensure you put them back in correctly as sometimes they can go in slightly misaligned. Also rethread the top to ensure smooth running. Make sure all dials are set to a straight stitch and it is not some misalignment of these causing the knocking.
SOURCE: thread
you need to do a tension assembly test.
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(To do this test, adjust your tension setting to normal or medium or 5 orsomething in the middle. Raise the presser foot and pull the thread through thetension. It should pull easily!! Lower the presser foot and pull the thread. Itshould pull noticeably harder.)
If it doesn’t work this way then you probably have a pieceof thread or lint stuck inside the tension discs. To remove it, turn thetension to 0 zero and raise the presser foot.Using a small screwdriver, openthe space between the discs and spray with canned or compressed air. The stuffshould come out. Do the tension test again to make sure you got everything andthen try sewing again.
sewman7
SOURCE: My machine isn't quite picking up the bobbin
It definitely sounds like tension adjustments,m make sure the top tension is about 4 or 5, you should only just about be able to pull the bottom thread through with some resistence, if it is too tight slacken the screw about a quarter of a turn anti clockwise and test sew and keep doing that until you get it right.
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I have cleaned, oiled, rethreaded, new bobbin, and new needle. Still jams.
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