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Bobbin case tention spring bernina b740

Tension spring came out of bobbin

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  • Bernina Master
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It may be better to just buy a replacement bobbin case. It will be factory pre-set.

Posted on Apr 23, 2017

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Posted on Jan 02, 2017

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Will not sew,looks like its sewing but can pull right out. have changed needle, rethread,checked tension, not changed bobbin tention got any ideas


the needle thread is not picking up the bobbin thread
could be a case of needle /hook timing, not pulling the bobbin thread down the slot in the bobbin case to under the spring
Take it to a sewing machine repair shop for a service

Jan 05, 2016 | Sewing Machines

1 Answer

Bobbin tention


general guide - full bobbin if threaded into the bobbin case , there is a small screw on the spring - the correct tension is - when whole bobbin case with bobbin inside - being held by thread (like yo-yo) and the lot should drop just a fraction when jerked down-up a little. Then match the top thread tension.

Nov 06, 2015 | Sewing Machines

1 Answer

How to adjust bobbin tension bernina 150


On the side of the bobbin case is a half moon shaped curved spring with a screw through it securing it to the bobbin case
take the small yellow or red screwdriver that came with your machine and turn the screw clock wise to tighten and counter clockwise to loosen. Correct tension is achieved by inserting a full bobbin of thread, into bobbin case, remove the half moon shaped shuttle from machine, put the bobbin case on to the shuttle, now hold just thread and with a youo motion shake the above and the shuttle and bobbin case should slide down the thread about 12 to 24 inches for correct tension

Jul 09, 2014 | Bernina Virtuosa 150

1 Answer

Loose top thread bernina 1008, tension problem but no solutions yet...


Are you sure you are getting the top thread between the tension discs? You should be able to tell the difference when you lower the pressed foot.

Jan 27, 2013 | Bernina 1008

1 Answer

My mother has a bernina 1008 and now that we have taken the bobbin casing out to clean it won't catch when threaded. Any ideas?


Are you threading the bobbin case correctly - the bobbin should rotate clockwise when pulling the thread out under the tension spring. Are you ensuring that the bobbin case is firmly clicked back into position when replacing it. Check your needle is OK. Did you remove the hook from the hook race when cleaning out - have you oiled the hook race ?

Jan 22, 2012 | Bernina Sewing Machines

1 Answer

How to replace the tension spring in a bobbin case?


There are two springs on the bobbin case of a rotary hook machine like the 180 and I suspect you're talking about the thread tension spring on the outside of the case - this is held on and the tension adjusted by a two very small screws. The other spring is the brake spring which is a complicated shape spring that sits in the bottom of the case and puts a slight amount of pressure on the bobbin itself. Assuming the thread tension spring has been recovered along with its two screws, it should be fairly self-evident how it fits back onto the bobbin case - the spring lays across the **** in the bobbin case, through which the thread is pulled, so that the tip of the spring with a small right-angle bend just sits down into the aperture where the thread comes out. Now, importantly, the two screws are different sizes ... the one with the smallest head holds the spring onto the bobbin case and is screwed-down firmly through the hole in the flat end of the spring. The larger screw adjusts the thread tesnsion and is screwed through the hole with the slight conical sides. Now the tension should be adjusted to 5g using a proper gauge, but failing that, insert a bobbin loaded with a thread such as Metrosene and thread the bobbin case up. hold the end of the thread so that the bobbin case hangs on the thread - it should not move/unreel itself. If it does, adjust the tension screw (the bigger one) a little bit at a time until it doesn't unwind. The approximately correct tension is obtained when the bobbin will only unreel when you **** the thread upwards gently. You can fine adjust the tension to get the correct balance by ensuring the top tension is set to normal (red line) and adjusting the bobbin tension until the stitch lays properly in the fabric - use different colours top and bottom to check this. Be aware that the bobbin thread tension varies quite alot with only a small rotation of the adjusting screw, so take it is small steps.
Hope this helps.

Jan 05, 2012 | Bernina Artista 180

1 Answer

I just loaded the bobbin and when I sew the bobbin thread is wavy Is it a tension problem or did the bobbine not load properly or do I have the bobbin in wrong?


Do you mean that the thread on the underside of the stitching is wavy? if so, yes it sounds as if the bobbin thread is not under tension.

Take the bobbin out of the bobbin case and reload, make sure that the bobbin is in the right way and then hold the bobbin still and press the thread tail into the tension spring until you hear it click in. Usually the thread will come off the bobbin, through the tension then reverse direction in a "v" shape.
tally_girl_43.jpgI think this is your bobbin case. So bobbin would go in and rotate anticlockwise, and thread would go into the tension spring south, then reverse direction north so rotary hook catches the thread.

Just make sure thread is fully into the tension spring, pull backwards on it and it should stay in the tension device if its in properly. If not, it will come out.

If you can't get a resolution then the tension spring may have failed, you can buy replacment bobbin cases from Brother, a local dealer or
http://www.sewingpartsonline.com/bobbin-case-babylock-bernina-brother-riccar-x59802101.aspx

I trust this helps you resolve the issue, often its just threading up and a bit of a break away for five mins, then fresh eyes, rethread carefully, checking the manual directions, and issue will resolve.

Jul 05, 2011 | Brother PS-1250 Pacesetter

1 Answer

How do you adjust bobbin to the correct tension


to regulate the lower tention,turn small screw on tension spring of bobbin case with small screwdriver.to increase tension turn clockwise very slightly .to decrese tention turn counter clockwise.very slightly

Jul 03, 2010 | Brother XL-5500 Mechanical Sewing Machine

1 Answer

The upper thread tension on my Bernina 930 is too loose. I have changed the needle (it is in correctly) Checked for dust/thread remnants in both the tension springs and bobbin. Cleaned and oiled the bobbin...


If you threaded the machine with the presser foot lever raised and the stitching is still loose, the tension control may need a new spring or the entire control may need to be replaced.

Berninas tend to be the only brand that hold their value and it would be worth the expense to take it to an authorized Bernina dealer for service and repair.

Mar 25, 2010 | Sewing Machines

1 Answer

Bobbin tension


Bobbin Tension Adjustment:

1. Do you have a genuine Bernina bobbin casing and not an Oriental copy? If yes, proceed as follows:
2. To set the bobbin tension, wind a genuine Bernina bobbin with Metrosene thread, type 1161 white thread as your "gaging thread". Load the bobbin case so that the bobbin turns CW. Attach the bobbin case to the hook body from the machine. Wind a couple of revolutions of thread around your index finger with the assembled bobbin case and hook body dangling about 6" to 12" below your finger. Gently and rapidly move your finger back and forth in a "sideways" motion about 1/4" to create a gentle vibration on the bobbin assembly. (Do not shake the bobbin assembly up and down). When the tension is right, the bobbin assembly should fall slowly and as you stop the movement, the assembly should stop.
The adjustment is found on the small screw, holding the flat tension spring against the bobbin case. If the tension is too tight, one must loosen the screw (past) the desired location and always make the adjustment by tightening to the correct position.

There are other checks for tension imbalance and associated problems on the bobbin case that I won't go into here. For further information I can help you later on.

Top Tension Adjustment:

1. The top tension rarely changes and can be depended on throughout the life of that machine providing that tension assembly is maintained occasionally. This can be done by blowing out the tension disks with the presser bar lever in the up position. One can also drag or pull a piece of sized percale or muslin through the disks with the presser bar lever in a down position. Perhaps both methods can be employed.
2. Load the top of the machine with Metrosene 1161 thread in a dissimilar color. I prefer to use a pastel color so as not to create an optical illusion of imbalanced tension.
3. Sew a satin stitch (.25 on the Nova 900) in sized cotton muslin with a thin piece of paper between two plys of fabric. The width should not exceed 4.5mm (standard width on the 900 Nova), however the newer machines have wider stitch widths so one must adjust as specified. The result will be a slight amount of top thread in symmetric lines on both the right and left sides of the satin stitch.

Typically, the top tension will not need adjusting. If the Nova 900 needs adjustment, please ask for additional help.

Sep 11, 2008 | Bernina 1008

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