Question about Bernina Virtuosa 150

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Bernina Virtuoso 150 - all of a sudden my machine is dropping stitches and the bobbin thread is bunching up. It also most feels like my machine is trying to do a gather stitch. I changed the needle and took the bobbin assembly apart to clean, but I can't get it right. Any suggestions?

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Check that the thread is tight around the bobbin. Make sure that the bobbin is in the right way around - the bobbin thread should double back on itself coming out of the bobbin holder. The bobbin tension adjustment is the small screw in the plate on the bobbin case that the thread passes under as it comes off the bobbin and goes out.

Posted on Mar 17, 2011

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Posted on Jan 02, 2017

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My Bernina Bernette 65 has a problem with the thread bunching up every 10-15 stiches on the bottom. Some of the thread stitches on the bottom of the fabric are in a straight line, and then the thread will...


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then try to adjust the top thread tension again, if the stitches remain loose and the tension won't adjust then the tension knob needs to be checked to see if there is something wrong with it.
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If the thread is bunching under the fabric, most likely it is bird nesting.

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My top stitch is flat, but the bobbin is bunching and looping extra thread. cotton fabric, polyester thread


What looks like a bobbin problem is sometimes the threading of the top thread.

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Sewing a bunch of thread from the bottom, this stops the machine from actually sewing


Yes, it does. There are a couple of reasons the bobbin thread could be bunching up on the underside of the fabric. It could simply be that the machine needs cleaning. Take the bobbin assembly out, brush all the old lint out as best you can, reoil the machine once it's all clean, and make sure there aren't any little bits of thread caught in the bobbin assembly. Rethread the machine (carefully) and change the needle. This solves the problem usually--especially if the machine was sewing along fine and the problem develops suddenly. '
The other thing to check is your tension. It could be that the top tension is too loose. But different color thread in the top and in the bobbin, stitch a few inches (be sure to held the top and bobbin thread ends behind your needle as you start to stitch) and check. WIth the pressure foot down, adjust the tension, and stitch again. Keep stitching, checking, and adjusting until you see little if any bobbin thread on the top or top thread on the bobbin.
Another thing to reminder: use the appropriate thread and needle for the fabric you're sewing.
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In checking I can either adjust the tenion screw and if that does not work, purchase a new bobbin case.

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Try these time savers:
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