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Most bobbin cases have a latch that must be released to remove or install in the machine. Be sure to hold the latch open while you insert the bobbin case into the machine. Rotate the bobbin case slightly until it feels seated. Then release the latch. If the bobbin case is not latched in place, it will continue to fall out whenever you begin to sew.
I would recommend using an authentic bobbin case and bobbins for your Bernina. Your dealer will have them. Just be sure to tell them the model you have.
FWIW, you can remove the shuttle hook and bobbin case by turning the 2 little black levers at the bottom right and left in the bobbin area, Once you do that, the circular piece that holds the bobbin mechanism in place can drop down and the bobbin case and shuttle hook can be removed as one unit. You should probably do this frequently to brush out the lint and debris and to oil the "shelf" where the hook resides. Oiling the hook shelf should be done about every 8 hrs of sewing.
Make sure the needle is facing in the correct direction,stitches don't form, or skip badly when the needle is turned around.
Put the bobbin in the bobbin case (right way around) leaving a 2-3" tail.
Thread the top of the machine correctly, leaving a 3-4" tail after threading the needle.
make certain your bobbin in locked into position in it's case and the thread is coming from the bobbin in the correct direction. When holding my metal bobbin in my hand, the thread pulls counter clockwise before placing it into my front loading bobbin case.
Also check if the needle is not properly installed in the needle bar,the machine is not threaded properly or the machine needs adjustment or repair..
Once the bobbin case is damaged you need to replace it or the problem only get worse. If you are on your third case then something is not right. This machine does not have that kind of history of problems with the bobbin case. Typically this kind of problem is caused by the thread not being inserted into the thread take up lever correctly. (this is the lever that moves up and down when you sew and you see it at the top when you thread it) There is a small spring gate that the thread needs to pass thru when you thread it, There could be a problem with the positioning brackets that hold the bobbin case in place so I would explain that you feel three bobbin cases replaced is excessive and you need some help in getting the problem corrected.
I have assumed that the dealer is replacing the cases for you, if you are just buying the case and putting in yourself, then the problem may well be the brackets, Good Luck!
Make sure the bobbin case sets sort of on top and not under the ridge of the metal ring. There is a small latch on the upper left of the bobbin case. It is metal. rotate the latch to cover the bobbin case and this should stabilize the case without making it immobile
there may be uneeded friction occuring. are you sure you inserted it correctly? sorry. photos aren;t appearing. but it may be that it is the wrong type or in the wrong place. do some trial and error and fit it into different positions on the bobbin runner
I was having the same problem with my machine and finally the spring broke. I couldn't find any parts for this so my husband made me a new spring out of a coke can! LOL!! Anyway, he messed with it for a while and it kept doing it. He figured out that it was not the spring but the other piece under the spring was not pushed up far enough to keep the bobbin case in place so he took a screw driver and pushed it forward toward the bobbin case and now my bobbin case does not move!! And the machine is sewing perfect! At least for now. Anyway, it's not the spring or the thread adjusting screw!
If your machine is older than 18 months, it needs a free upgrade from your dealer. The plastic see through needle plate needs to be replaced by a newer version that will keep the bobbin down. Further more a bobbin case position finger needs to be installed.