Question about Bernina Activa 140

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Bottom stitch keeps getting tangled up after needle change

The needle broke when I was shortening jeans. I replaced the needle, seemingly without any problems. Now, when I sew, the stitch looks fine on the top, but when I turn over the fabric, it's a tangled mess on the bottom.  I've redone top and bottom thread 3 times and don't see anything wrong with it. Please help!

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Re: bottom stitch keeps getting tangled up after needle...

The solution provided sounded above my technical ability, so I took it in. They said the needle and the bobbin got misaligned, so they'll fix it. Thanks for the help, though.

Posted on Oct 23, 2007

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Re: bottom stitch keeps getting tangled up after needle...


Sounds like the needle has hit the hook.Open the bobbin area door, remove the bobbin and bobbin case. The swing the two lugs that hold the hook retaining ring to the side so you can remove the hook. CAREFULLY inspect the sharp tip of the hook. It will be sharp and 'chisel' shaped. ANY marks, scratches or burrs on the hook must be removed carefully with 180 or 400 grit 'wet and dry' abrasive. It must be as smooth as a 'babies bum' !! If you are not confident, take it to someone to do it for you. The hook is expensive, so don't mess it up!  

Good luck!

Posted on Oct 22, 2007

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The lower thread does not bring up , so that the uper thread does not come in contact with the lower thread .I hear unusaul noise while sewing.All these happend when I tried to sew a jeans .i used a thread...

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Those big industrial sewing machines that they top sew jeans on are very different to a domestic SM, many make a chain stitch or fell the jeans seams and are very heavy duty.

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Needle's thread gets tangled in bobbin

First, open the needle plate and make sure the bobbin area is clean and free of lint and thread.

Check the needle to make sure it is not bent and is properly inserted into the holder - usually with the flat side facing to the back of the machine.

Refer to your manual for bobbin insertion to be sure the thread is feeding from the bobbin in the correct direction and through the proper guides.

Always thread a sewing machine with the presser foot up. This opens the tension control and allows the thread to properly enter.

When the foot is down, the tension control closes to the sewing setting and if the thread is not in place, there is no tension on the thread and it gets loopy.

After threading, lower and raise the needle while holding onto the thread tail. This will pull the bobbin thread up through the needle plate. Take hold of both threads and take them under the presser foot and to the back of the machine.

Hand walk the first stitch when sewing and this should keep the top and bottom thread from tangling.

When stopping to change the position of the fabric (turning a corner, sewing a curved seam for example), do so with the needle down into the fabric. This not only anchors the fabric so it does not slip, but prevents mis-stitching.

If you are doing everything according to the manual and are still having a problem, the machine may need to be professionally serviced.

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Hi! Sounds like you're doing everything right to me, so let's see.

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2. Using your flywheel, lower the needle all the way through the stitch-making process to see if it's hitting anything along the way.

3. Oil your machine.

4. Make sure all the screws etc on your throat plate (also called needle plate) are tight. (I've had mine get loose and that will definitely throw a knock into the works!)

Check out these ideas and let me know if anything works, or if the problem is still there, ok?

Happy Sewing!


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