That is a fairly common issue on that model. The feed system seizes from a lack of lubrication. It is normally an expensive repair because the parts are scarred now. Probably time to replace it.
After working with it for a day, I have retired it. New sergers are cheaper than fixing my old one. Thank you
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SOURCE: Feed dogs not feeding material
Make sure that you did not disengage the feed dogs by accident. You should have some type of button that allows you to control the feed dogs.
SOURCE: I have an older 1998 portable Bernina with feeder problems.
Maybe just working that bullet shaped part will get it going. If it's a 930, you need to turn the handwheel to make the dogs get back into 'operational mode' after you move the knob.
Sometimes the mechanism is stuck behind the knob. Don't force the knob. It's possible to take the motor casing off and work it loose. Use TriFlow lubricant (small black bottle Sherwin-Williams) and leave for a while. Push gently with a pencil. Whatever you do, don't whack it with a hammer, like some folks say. It likely needs to move in the other direction (if it's stuck in 'regular' mode) i.e. towards the needle end.
SOURCE: The feeder won't work right.
The machine is old and may not have been maintained. The feed dogs may be rusted.
Remove the needle plate and bobbin. Lightly mist the feed dogs with wd-40. Wipe away the excess with cotton swabs.
SOURCE: The feed dogs will not move the material
check the feeddogs & see if there in the up position, if there not move the lever or knob to the up position
if the lever is up then there is something wrong with the feeddogs & it needs to be serviced
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