Hello,
Please apply the below recommendation to solve the problem of your machine that loop up
When customers bring their sewing machine in for repair at my shop, a
frequent complaint I hear is the thread bunches under the fabric. This
usually then leads to a jam of some sorts and the customer fiddling
with the tensions and oiling everything in sight. The finished result
is a machine that is jammed, tensions out of whack and a slippery
machine.
Thread bunching can be a symptom of a few ills your sewing machine may
have. Some ills are easily rectified and some others I would recommend
you take the machine to your nearest sewing repair shop.
Usually, thread bunching under the fabric is a symptom of something
wrong above the fabric. There is an inverse relationship between fabric
and thread (top of fabric is bottom thread, bottom of fabric is top
thread). Most people think thread bunching on the bottom is the
bobbin/bottom thread. This is incorrect. We must look for problems
starting at the needle and upwards.
Follow the checklist and instruction below to repair the thread
bunching issue. If by the end of the steps the problem is not fixed you
should bring it to a sewing repair shop.
THREAD MACHINE - This first and easiest thing to do is to re-thread the
entire machine. Pay special attention to the take-up lever and the
tension assembly.
Always have the presser foot in the UP position when threading the
machine. This opens the tension disc to allow the thread to nestle
inside the assembly.
Make sure the thread passes through the take up lever
Make sure you inserted the thread in every thread guide
NEEDLE - I always recommend a sharp needle. You may not notice any
slight bends, burrs or dullness in the needle which would throw off the
timing and the stitch quality.
SPOOL CAP - If you have a horizontal spool pin a spool cap is very
important. Its also very important the spool cap covers the end of the
spool of thread but make sure its not too big or it will throw off the
thread tension.
TOP TENSION DIAL - The setting should be between 3 and 5 on most machines.
Make sure thread is in-between the tension discs. On some machines you
can visually see the discs. On newer machines it is hidden.
The best way to know if you threaded the tension assembly correctly is
to put the presser foot in the DOWN position. Now take the thread from
the right of the tension assembly and pull. Is there tension on the
thread or does it pull out very easily? If it pulls out easily you
threaded it incorrectly. Try it again -- see step one.
FEED DOGS - Be sure the feed dogs are moving and feeding the fabric
evenly. Turn the hand-wheel towards you a few times. Can you see the
feed dogs moving up and down? Feed dogs are located on the needle plate.
If the feed dogs are not moving
Some machines have a lever to engage and disengage the feed dogs; make sure they are engaged.
If they still are not moving then you may a broken gear.
Now you can test your sewing machine. Set the machine to the widest
zig-zag and the longest stitch length. Put a test cloth (one fold in
the fabric) under the presser foot and give a go for about 20 or 30
stitches. Did it jam? Is there bunching? I hope not!
Now check the stitch quality. Look at the stitches on the test cloth.
Is the thread knot visible on either side of the fabric? The knot
should be invisible. This means the knot is nestled between the layers
of the fabric and you cannot see it. This is a good indicator of a good
stitch.
If you can see the knot, then your tensions are out of balance and they
need to be adjusted. All sewing machines have a top tension and a
bottom tension. Both tensions must be in balance to have a good stitch
quality. It takes quite a bit of experience to balance tensions
correctly. I do not recommend doing it yourself.
If you have any questions please feel free to leave me a comment.
Good luck and thanks for using fixya.
I have worked on a ton sewing machines, but now facing the same problem.
I have a singer promise ans is just a few months old. Sewed very well and suddenly gives me loose under stitches since 2 days. I have tried different threads, bobbins, all stichtes and tension options on different fabrics, but no result. Whenever I pull the upper thread a bit up right in tje beginning, it sews a lot better and sometimes almost perfect stitches, but I dont get the logic of this and were it might be wrong and why/how? Pls help me.
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