Bobbin case is loose and jamming
the tension for the top thread needs to be adjusted.it's also because the bobbin thread has slipped out of the little case. Make sure you load the bobbin into the case with the thread tailing off into your left hand, then pull it all the way down into the little slot. Give it a tug to make sure it's going to roll smoothly. take the bobbin out and reinsert it in the case, try both ways, you could have it in backwards.
Increase the tension on the top thread. The bobbin tension is so tight, it is dragging all the stitches over to the back side of the fabric, so you need to increase the tension on the top thread to compensate.
**Do this first: re-thread the top thread. A lot of times, it slips out of the tensioner disc, or something else happens, and re-threading the whole thing magically fixes it (you could see it if you really looked, but it is easier to re-thread it).
It could be the bobbin case itself has the tension too tight, but that is not usually an issue.
Are you holding the thread ends as you start to sew? You get a big jam up at the beginning if you do not do this.
Your problem lies within these three letters... TNT.
Remember these. Threading, Needle, and Tension. These are always the 3 main problems. First make sure its threaded right. Be sure your bobbin (spool) on the bottom is in correctly also and threaded right. It may be upside down in its bobbin case and turning the wrong way.
Second, make sure you have a NEW needle and that it is inserted all the way up.
Third is tension. If your upper tension is too loose you will have all kinds of problems. to make sure you inserted the bobbin into the bobbin casing the correct way (clockwise vs. counter clockwise), Than pull on the thread in a yo-yo motion. The thread should pull out a little bit than stop. If it pull out more than that tighten the screw.
Also make sure you have you bobbin thread wound tight enough, and that your machine tension is correct.Check the bobbin thread tension once you have the bobbin threaded into the case. Hold the bobbin thread in your fingers and drop the case down quickly like a yo-yo. If it doesn't move at all, the tension is too tight. If it slips down by just holding the thread, it's too loose. The case comes pre-adjusted, but occasionally you may have to turn the little adjusting screw on the case slightly to tighten or loosen it.Some machines recommend a drop of oil on the bobbin case, but a few have plastic components and suggest that you don't oil them.so check that option also if there is a plastic component or metallic component.
Return the bobbin case by holding the latch on top of the bobbin case and inserting it into the well. The small arm sticking out on the side of the case fits into a slot on the well. Make sure the bobbin is engaged in the proper position before replacing the bobbin cover.
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