My 640 E Bernina sews for a bit, then I get a bobbin warning and the machine stops till I press ESC. Then it starts again. I have taken the entire bobbin case and insides and cleaned them think ink it was lint on the eye. Any ideas??

SOURCE: Bobbin Carriage clanking noise, yet the machine sews fine??

If your bobbin area is making a noise, then do NOT sew with the machine until a reputable technician looks at it. You may have thrown something just a little off line - not enough to affect sewing NOW, but it could easily cause troubles down the line.

I suggest you call ahead and talk directly to the repair person - not to the sales person. Ask if you can bring in the machine while he/she is in the shop so they can listen while you run it.

You aren't trying to cheat the store out of the repair charge, just ensuring that the problem is diagnosed correctly.

You paid lots of money for this machine - it deserves good care.

SOURCE: skipping stiches

1) It’s possible the machine is threaded incorrectly. Remove the thread completely and rethread the machine. Be sure to use good quality thread--don't buy the cheapest you can find. A good thread will help your machine perform better and your projects last longer.

2) Poor stitch quality can be caused by the needle. Make sure you're using a new needle that's right for the job. Many times machines are taken in for repairs and all they need is a new needle. If you can't remember the last time you changed the needle--it's past time. Needles should be changed at least every eight hours of sewing.

3) When inserting a new needle, make sure the flat side of the needle faces away from the bobbin area. For example, if your machine has a frontloading bobbin, the flat side of the needle faces the back of the machine. If your machine has a side-loading bobbin, the flat side faces the right side of the machine. Some older sergers require special needles that don't have a flat side. Refer to your owner's manual to properly install a serger needle.

4) Thread that shreds or breaks can be blamed on the needle. Use a good thread and make sure the needle eye is large enough for the thread type. Also use the right type of needle for the fabric;
5) The machine tension adjustments put stress on the thread so it doesn't simply flow through the machine. When the upper and lower tensions are balanced, the stitch forms correctly. Tension is easy to adjust--stitch on fabric samples with a different thread colour for the upper and lower threads. Observe the stitch, adjusting the tension until the stitch is formed correctly. As a general rule, adjust the upper tension first. If the stitch still isn't right, adjust the bobbin tension.

SOURCE: Bernina 1130 not catching bobbin thread

there will be a adjustment in that you should select the stiching mode and in that give the straight mode the problem will be solved

SOURCE: Bobbin Case

I'm having a similar problem today. I took out the bobbin case and when I went to put it back in, the whole system locks up. I've tired cleaning, changing needle taking the metal plate and piece that holds bobbin case out and put it all back in after cleaning. Nothing. My symptom is I can't get a complete stitch, the needle goes down, the whole deal acts like it will work and as soon as the arm of the bobbin case gets to 8 o' clock on the gears, It jams and won't hardly move. I cannot pull the bobbin case out easily after this. Perhaps there is someone out there that can help us!

SOURCE: bobbin case case keeps jamming

I am having somewhat the same problem with the exception that my needle did not break. I've cleaned and oil, but the bobbin case and projection positioned spring is not communicating to allow sewing to continue. The thread keeps jamming and the bobbin raises up the plate. So, what else am I to do?