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Bobbin thread is not entering material. Upper thread is in large very loose loops around bobbin thread on underside of material.

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Sounds like top thread is not under tension at all. Rethread machine referring to your manual threading diagram and ensure the thread is passing between the tension discs.

If you lower the pressure foot and pull the top thread just before the needle, it should feel firm and not pull easily. If not, its not under tension.

What number is your tension dial set to, if you turn the dial while pulling the thread as above, can you feel any difference in the resistance?

Also a good idea to clean the tension discs regularly, turn number to zero, then run the selvage edge of a piece of clean cotton offcut between the discs. Thread sheds fibres and dye particles and this can build up with time so good practice to clean this regularly.

It is possible that the top tension device has broken, they sometimes have a little spring in there which may have failed.

But try these things first, then if no luck, might be time for a service technician to take a look.

Posted on Apr 08, 2011

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Most of the time the bobbin stitch is correct. Occasionally there is a loop in the bobbin thread. Any suggestions as to what this could be?


Is it actually the bobbin thread that loops or is the loop appearing on the underside of the fabric as you stitch? If it is a loop under the fabric, that's usually an indication it is an upper thread issue. Thread irregularities that appear on the topside of the fabric are generally bobbin related.

First thing to try is installing a brand new needle. Verify it is the correct needle for the fabric and thread being used.
All About Needles
Sometimes, the fabric being stitched will "grab" the thread and hold it for a second before releasing and will cause a loop. In this case, a needle with a larger scarf and eye may be helpful.

You might also open the upper tension as much as possible, RAISE the presser foot and run a piece of UNwaxed dental floss through the tension disk a few times to clear out any gunk that may be stuck there. A piece of pearl cotton dipped in rubbing alcohol and squeezed moist/dry will also work.

Remove the upper thread. RAISE the presser foot and rethread the top thread from the beginning. Use only fresh, good quality thread--NO old or bargain bin variety! Try using the same thread in the top and bobbin. Make sure the thread is firmly seated in the tension disk and the thread path is correct. Check that there are no burrs or snags in the thread path that could be catching the upper thread. Especially, check that the thread is not catching on the spool "slit" that holds the thread when in storage. Every time the thread navigates around the thread spool, it could be catching on that slit just enough to cause a loop.

Try changing the bobbin. There could be something amiss with the current bobbin--could be nicked or could even be the wrong bobbin for the machine. Also, make sure the bobbin is loaded and turning the correct direction in the machine.

Set the upper tension to the midway point. This is usually the starting point, although it will probably require some tweaking. Test your stitch and adjust the tension so the upper and bobbin threads meet in the middle of the fabric. Neither thread should dominate one side of the fabric or the other.

Understanding Thread Tension Threads

Last thing to try is a different presser foot.

If you still have the intermittent loop, you might want to take it for service. Could be a problem within the tension disk.

Nov 05, 2016 | Sewing Machines

2 Answers

The bottom thread is real loopy. I have adjusted the top tension and it helps a bit but still to loose


Remove all the thread from your machine. Install a brand new needle. Raise the presser foot and re-thread the upper thread, making sure you are following the correct threading sequence. Confirm that the bobbin thread is threaded through the bobbincase properly. Now, perform another test stitch. Is the bobbin thread still looping?

If you have already tightened the upper thread tension and the bobbin tension is still too loose, then you may need to tighten the bobbin tension. First, mark with a permanent marker where the slash of the screw head meets the bobbin case. This will mark where the screw was originally set before you begin making adjustments and allows you to return the screw to that position should you need to.

Set the upper tension to the halfway point between the high & low number. This is what would normally be the standard.

Then gently turn the bobbin tension screw to the right 1/8th of a turn at a time. Then test. Keep adjusting until the bobbin thread tension is correct. The tensions are correct when the upper thread and the bobbin thread meet in the middle of the fabric.

...

Nov 15, 2015 | Sewing Machines

2 Answers

Top thread leaving loops on the bottom of the fabric.


what you describe is an indication of the needle top thread tension being too loose
make sure that the thread is between the pressure plates of the tensioner and not behind it
next remove the plates around the base at the bit the moves the material through so that you can see when the needle is approaching the bobbin hook
when the needle is at the bottom of the movement, that bobbin hook should be almost at the eye of the needle .
that is called needle position timing
if the hook is not near the eye of the needle or past it then you will have to have the machine serviced and that timing corrected
check the way the need is installed
the cut away bit should be facing the hook and the small groove is where the thread sits so that it does not jam as it goes through the material

Sep 24, 2015 | Sewing Machines

1 Answer

Looped threads


Hello Rosemary
Looped thread on the underside are created by the upper thread. Loops on the top of the fabric are created by the bobbin thread. Whichever one is looping, has very little tension. This may be corrected by:
1. Re-threading the upper thread according to manufacturer's specifications.
2. Re-wind bobbin and re-set it into bobbin case and bobbin case area according to manufacturer's specifications.
3. Ensure that the needle is correctly installed and is the correct needle for the sewing machine.
4. Ensure that he bobbin being used is the correct one for the machine.
5. Double check that the tension on the upper thread is at the correct setting.
6. Double check that the tension unit is clean and free of dust, lint or lodged thread/s.
7. Double check that the bobbin tension is correctly set ... if you are comfortable doing so, otherwise leave it for a qualified technician
8. Make sure that he presser foot is down when stitching.
Please let me know how you go.
Happy stitching.

Nov 14, 2014 | Sewing Machines

1 Answer

Tension is loose underside


Loops appear on the surface (top side) of the fabric?
Reduce the tension by turning the upper tension control dial to a lower number. If the loops still appear on the surface of the fabric after you adjust the upper tension, the bobbin thread may be too loose. In this case, turn the screw clockwise, being careful not to over-tighten the screw, approximately 30-45 degrees to increase bobbin tension. After you adjust the bobbin thread, adjust the upper thread to match the bobbin thread.
Make sure you reset before your next project.

Apr 26, 2013 | Brother LS-2125 Mechanical Sewing Machine

2 Answers

The stiching on my machine is real loose and catches on the underside of the fabric and bunches up, like the tension is real loose but it is set right can you help?


Check the bobbin tension and that the thread is tight around the bobbin. Make sure that the bobbin is in the right way around - the bobbin thread should double back on itself coming out of the bobbin holder.

Feb 24, 2011 | Necchi 4575 Mechanical Sewing Machine

2 Answers

My bobin thread gets tangled and loose


have you checked the tension? In the older machines you could adjust the thread tension by tightening the screw on the side of the bobin case. With alot of the newer machines you have to lift out the bobbin and then lift out the casing to adjust the screw on the underside of the casing.

Oct 28, 2010 | Sewing Machines

1 Answer

BOBBIN TREAD LOOPING UNDERNEATH


looping thread on the bobbin side means that the upper tension is too loose... make sure it's threaded correctly.

Jun 14, 2009 | Feiyue FS288

1 Answer

Machine is threaded but thread not sewing into material, just holes!


Check bobbin thread....Insert the bobbin thread into the bobbin case in a clockwise direction...pull the thread through the **** on side of bobbin case and slide up into small opening...make sure you pull through about 2 inches of thread to enable upper thread to loop. Good Luck

May 10, 2009 | Sewing Machines

1 Answer

Thread or bobbin tension


Thread tension. Beware of adjusting the bobbin screw. Pfaffs maintain their tensions just fine without adjusting the bobbin tension, unless you're using some crazy thick or fine thread. If you must change your bobbin tension, you would be well-advised to buy an extra bobbin case, because re-calibrating your tensions after changing them can be less than fun.

Increase your top tension, and your looping should cease. I normally keep my tension around 4.5. Also make sure you're using a good quality thread, and that there's nothing in the upper tension assemblies. Sometimes a tiny piece of debris can keep the top tension from applying enough tension, so turning the machine off and blowing some canned air in there can help as well.

Good luck,

-R

Mar 10, 2009 | PfaFF Creative 7570

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