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The Bernina foot 37 is called the 'Patchwork Foot'. It is very useful in piecing quilt tops as the foot features an accurate 1/4" and 1/8" on both sides of the needle. It also has a 1/4" guide in front and behind the needle to allow accurate 1/4" stops and starts from the end of the pieces being stitched together.
An excellent reference guide is available on line at: http://berninainstitches.com/pdfs/Bernina_Presser_Feet_Guide.pdf
You may need to increase the foot pressure to cope with the heavy denim material. Look carefully at the material as the machine tries to stitch ... if the foot is not keeping the material firmly on the stitch plate, it might be riding up on the needle (denim tends to be rather 'grippy') which will prevent the thread loop being formed correctly below the stitch-plate and therefore not getting picked-up by the CB hook. Changing to a bigger diameter needle might actually make the situation worse in this case ... go back to an 80 and try again.
The machine Knows the foot number buy the small glass part of the foot just on the upper right side of the foot. Check to see if that is not damaged and clean. Also check the sensor on the machine just above the foot for not damage and clean. If that is good make sure your foot is paralel with the stitch plate. Do this buy putting a single hole foot on your machine and make sure the needle is right in the center. If this does not work you will need to take it in. May be a bad sensor or unpulged but that is rare.
Also not all bernina feed have this foot sensor, if this is the case it will not read it
hope this helps
When you thread the top thread, ALWAYS RAISE the presser foot so the thread will seat completely in the tension disk. If this doesn't improve the stitch, try tightening the top tension. If it is too loose, the bobbin thread will lay on the surface of the fabric. When the top tension is tightened, it will pull the bobbin thread up into the fabric.
I have a Bernina Virtuosa so not the same machine - but this may help. There is an icon on the front of the machine - it is a needlepoint pointing at a dot in an oval - there are arrow buttons on either side. These move the needle left or right of center and it shows on LED screen. I checked mine just now and if you turn machine off and on it resets to center automatically. Hope this helps - Happy Sewing!!
First the simple solution. Make sure your needle is inserted flat side to the back and all the way up.
The only other thing I can think of is that your hook is out of time and this will take a technician to re-time it. You may need to take it in for a servicing.
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