Recently (I think it first started happening after I hit a straight pin), there seems to be a problem with the thread getting caught down around the bobbin casing of my Singer 2662. I've changed out the needle, used a different bobbin, taken it apart, made sure nothing was jammed up, tried adjusting the tension, etc. Nothing seems to work--after about 2 stitches, both the bobbin and top thread get caught up in a horrible tangle, creating a huge knot and jamming the works. It's almost as if the top thread is getting caught up in the hook race, somehow. Any suggestions?
This is a bit late, could the bobbin case not be seated properly? You need to put it into place and then turn it clockwise until it seats soundly in the opening.
Also, check for burrs...the needle may have left a rough mark on the plastic or metal in the bobbin area. A piece of batting, or even an old knee hi should snag on any rough areas.
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Grab some scrap fabric of the same type you'll be sewing. Tighten your top tension and test sew until you see until you see the top thread of a seam go like a straight line and the bobbin thread loops on top of the seam. Then back off of the top tension until those loops disappear.
If you never see it the top thread go like a straight line... your top tension needs to be cleaned... and make sure you have the pressure foot UP when you thread the upper thread.
Most likely, when the needle hit the pin, the machine was knocked out of time. First thing, be sure to install a brand new needle. If that doesn't improve things, you'll probably need to take it for service.
Avoid sewing over pins. Accidents happen, but it's best to pull pins before the needle gets to the pin. The other helpful hint may be placing the pin parallel with the seam edge and placed further away so the presser foot will pass by the pin.
Does not matter what machine you have from a 50's straight stitch to a newer model right out of the box. If your needle is hitting you are out of time. It needs to be reset and on that I can not help you as it is mechancal on the underside. What the needle is hitting is the bobbin arm.
When the bobbin arm swings around it picks up the top thread and loops it over the bobbon thread then releases the threads together for the loops and swings again for the next thread. When you hear the needle hit it is hitting this swing arm. That needs to be adjusted and that is called timing.
Open the bobbin case and turn the needle down by hand. You will see the needle as it goes through the throught plate down the catch the bobbon thread. You will see it hit the arm.
This needs to be backed off or set forward. Takes a trained person as I have never been able to do it myself. This happens when you sew to thick of a fabric, or go over several seams from light to thick. Or is you are pulling the fabric. If you head a CLUNK when it started then that is what I think it is.
check to see if your needle is bent-roll it on a flat surface to see that it roll good
check to make sure the thread is not coming off the thread take up lever
check in the bobbin area for lint or loose threads
check to make sure the thread is not getting caught on the spool, sometimes the notch on the spool can catch the thread
check to make sure the thread is not winding around the spool pin
you need to replace your shukle that holds the tread bobbing below.it is either slack or broken . if it is slack then you tighten the little screw that holds a cover that gives the thread tension .if its broken then replace it.once the thread is slack below it will cause your thread to bundle up.