I have a Bernina Activa 140. I have tried to use the overlock foot no.2 but the needle is not seating properly and is hitting the foot not the the fabric.

Ok, the needle may not be shoved up high enough into the needle shaft, or the bobbin may not be seated properly in the bobbin case.

Likely the needle is not I. All the way up, or the machine is seriously out of time. A Bernina tech cure

As far as I know, the Patchwork 140 doesn't have a needle stop up/down button. You'll need to use the hand wheel to bring the needle up or down, as needed. The Bernina machines that have a needle stop up/down button have this button below the LCD screen. (On those machines, it's usually the left-most button below the LCD.) I suspect the index giving a page number for the Needle Stop Up/Down button is a artifact of using the same index for multiple machines.

The manual for the Patchwork 140 is available at Manuals Lib here: https://www.manualslib.com/manual/1002243/Bernina-Activa-131.html . The Bernina 135 has the needle stop up/down button. See https://www.bernina.com/en-US/Support-US/Machines/BERNINA-activa/BERNINA-activa-135 . The manual for this model is https://www.bernina.com/getdoc/90f75840-2b12-4f46-88f2-76f09e35d8d4/030529-52-04_0303_a135-a145_EN .

I hope this helps.

Cindy Wells

Likley only by hand

switch off bobbin winder

Almost every time this will be due to the machine being not threaded correctly. I've been sewing for 45 years and still mis-thread my machine occasionally. It's also possible that the bobbin thread didn't seat quite right when you put in the bobbin. Or, I've had mine do that if I didn't quite get the presser foot lever down completely. (working with heavy fabrics usually)

If that is not the case here, try replacing your needle with a new one, as it might have developed a small burr, and be certain that it's the correct needle for the fabric. Sometimes it can also be that the needle is in backwards. Also, cleaning it, (the bobbin area), out thoroughly by using a soft brush and some canned air can do wonders for it. Then use a drop or two of sewing machine oil where your manual indicates it to go in that area.

If none of that fixes the problem, let me know and I'll see if there is a problem specific to your machine that can happen.

Happy Sewing! :)

Fit a new needle, clean and oil the hook race, whether-or-not your manual says it doesn't need it and check that you have some tension on the thread coming out of the bobbin case and top tension unit. Are you threading the top thread with the foot up or down ? You should always thread the machine with the foot up to ensure the thread goes through the tension unit properly.

#1 Use only Mettler or Gutermann thread. Coats thread is very rough and will pucker the fabric. #2 Make sure that the tensions are balanced. #3 Use the regular zig zag foot. #4 Use a new needle, universal, size 80/12. A blunted point will pucker the fabric.

If you don't see a button that you can select for needle up / down, then you can't. Your foot control might might have a symbol at the lower side that shows and up / down arrow. If so you can tap the bottom edge of the foot control and the machine will half cycle, stopping with the needle in the down position.

feed dogs button will not pop out so it is flush with the machine