Bernna 140 presser foot clamp

That depends on which of the presser foot designs you are dealing with. For all presser feet, lift the presser bar to the highest level before removing the foot. For the snap-on foot, push up on the toe (the front of the presser foot) as high as it can go until the foot releases from the clamping shank. When you put on another foot of this type, you line up the foot on the needle plate and lower the presser bar. Press down on the presser foot thumb screw on the presser foot shank as you lock in the presser foot.

For one-piece presser feet, loosen the thumb screw and let the foot down. Then tighten the thumb screw around the shank of the next presser foot. On the super-high bar shank feet, you must push down the presser foot lock to detach the foot. See page 23 (page 24 of the PDF) of the manual for the presser foot attachment details. Sears Parts Direct currently has the manual here: https://c.searspartsdirect.com/mmh/lis_pdf/OWNM/L0909123.pdf .

I hope this helps.

Cindy Wells

pls tight ur button hole foot...while inserting needle

Here's a manual you can download. It should have instructions for attaching your presser foot:

Instruction Manual White 955

If you are using snap-on feet, be sure that you have the low-shank snap-on adapter for your machine (looks something like these) that actually clamps onto the presser foot:

Snap on Shank Low Shank


...

You can correct this.

Put an ordinary foot on. There's a clamping screw at the back of the part that has twisted round. The head of the screw faces towards the right of the machine (towards the hand wheel). Get a decent screwdriver and loosen the clamping screw a little. Turn the part round so that the sides of the feet are precisely parallel to the slots in the needle plate. Retighten the clamping screw.

Try not to let the misaligned part slide up or down which it will if you slacken the clamping screw too much. It's at the right height when the little lever you use to hold the foot in place has engaged about one third to one half it's length on the lump on the side of the foot at the top.

If you got inside and cleaned and oiled the presser spring... then you have probably loosened the clamping mechanism that holds the presser bar. Get back inside. Look for a mark on the bar and adjust it so that the mark is UP near the clamp.

there are 2 type of presser bar foot clamps
one allows you to snap on the foot--raise & then lower the presser foot holder until the cut out is directly above the pin on the foot,,as you lower the presser foot holder the presser foot will automatically engage when put down on the pin area

the second is a shank & foot combined & there is a screw on the presser bar,,unscrew it some & put the shank up around the screw & retighten the screw

You will need a certified Bernina tech to take a look at the machine to see what may or may not be needed.

Bernina does not give out info as readily as other manufacturers do.

First, raise the presser bar, remove the presser foot, the presser foot holder and screw.

Turn the handwheel to bring the needle to its highest position.

Place the darning foot on the presser bar and make sure that the metal bar of the darning foot is above the needle clamp and put the screw back on and tighten.

As the needle bar raises and lowers, the foot will hop up and down slightly.

Make sure that you always lower the presser bar when using this foot. Lower the feed dogs also if your machine has this feature.

I have seen these machines with broken presser bar clamps (something inside the head). If it is just a bind then some oil on the presser bar may work, if the clamp is broken then it is probably not worth fixing.
Good luck!

This may be a lubrication problem on the presser foot shaft. Try freeing up with penetrating oil or Triflow. After letting set for an hour lower the presser foot and pull down on the ankle. If that does not work you need to open the machine and loosen the clamp screw on the presser foot shaft. Then try to twist the shaft to loosen it up.