I have threaded & rethreaded many times checking if this was the problem. also bought new needles today (Universal lasse). I really need this machine going because I know it does really beautiful satin stitch & I need to finish off some applique cushions I am making to sell for Xmas! It has been out of use for a few years but was serviced not long before it was stored. I have oiled it and it doesn't seem to have excess lint. Help! Julie-Anne Jones, Otaki Gorge, New Zealand.
I needed to have it fixed as soon as poss so I had to take it to a machine repair man. He saw straightaway that it had a broken gear which was something I could never have sorted myself. Thanks for your reply.
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Your sewing machine tension
controls the rate at which the thread is fed through either the upper
section of your machine or through the bobbin case. If your upper or
bobbin threads aren't threading properly, sometimes adjusting the
tension will correct this problem.
Your sewing machine works by
passing the upper thread through the needle of the sewing machine at
precisely the same time the bobbin brings its thread to its uppermost
position. If either the needle or the bobbin thread reach these
positions too soon or too late, the threads won't interact and create
the knots that make the seam. You can throw off your timing by sewing
too many layers of fabric or hitting a pin with your needle. See you
sewing machine repair facility to correct any timing issues.
Thread can get snagged or caught
in the upper section of your machine or on lint pieces in the lower
bobbin section. If your threads aren't catching properly, you may be
able to fix it by unthreading and rethreading both your upper thread and
Is the needle thread actually going through the needle eye?
Is it chaining off without fabric under the foot? If not, then you need to revisit your threading up, there is a specific sequence that you need to thread the loopers then needles, then pull the threads under the foot, lower pressure foot and press the foot control to make a few stitches, a chain of thread should form.
If this is not happening and you have threaded it up in the right sequence, then check both needles are fitted correctly, fully up into the housing and flat shank to the back. On most sergers the two needles sit at different heights in order to form the stitches. If you haven't done it for a while, change the needles.
If you still can't get a chain of stitching then it is possible that the timing between the loopers and needles has gone out and it will need to be serviced by a technician to get this back right.
Is this the first time you have used the machine? If so you need to bring up the bobbin thread by hand before stitching. Only when both bobbin and top threads are up through the needle plate nad pulled towards the back of machine, will the machine form a stitch.
Most likely is the left looper thread is trapping the needle threads.
Remove the threads and start over in this sequence....
Left looper - right looper - left needle - right needle.
If you thread the needles before the lower looper, the needle thread wrapped over the looper will be under the looper thread and will never be free to form a stitch, so the threading sequence is critical.
1) It’s possible the machine is threaded incorrectly. Remove the thread completely and rethread the machine. Be sure to use good quality thread--don't buy the cheapest you can find. A good thread will help your machine perform better and your projects last longer.
2) Poor stitch quality can be caused by the needle. Make sure you're using a new needle that's right for the job. Many times machines are taken in for repairs and all they need is a new needle. Ifyou can't remember the last time you changed the needle--it's past time. Needles should be changed at least every eight hours of sewing.
3) When inserting a new needle, make sure the flat side of the needle faces away from the bobbin area. For example, if your machine has a frontloading bobbin, the flat side of the needle faces the back of the machine. If your machine has a side-loading bobbin, the flat side faces the right side of the machine. Some older sergers require special needles that don't have a flat side. Refer to your owner's manual to properly install a serger needle. 4) Thread that shreds or breaks can be blamed on the needle. Use a good thread and make sure the needle eye is large enough for the thread type. Also use the right type of needle for the fabric; 5) The machine tension adjustments put stress on the thread so it doesn't simply flow through the machine. When the upper and lower tensions are balanced, the stitch forms correctly. Tension is easy to adjust--stitch on fabric samples with a different thread colour for the upper and lower threads. Observe the stitch, adjusting the tension until the stitch is formed correctly. As a general rule, adjust the upper tension first. If the stitch still isn't right, adjust the bobbin tension.
Probably your looper timing is off. This is common, and just a necessary evil of sergers. Their tolerances are tight.
The operation of creating a serger stitch is a succession of thread grabing and delivering. One looper grabs a thread and delivers it to the needle and so on.
To check this, turn your handwheel slowly and check to see that the upper looper is meeting the lower looper by passing very close to the indented part at the back of the lower looper (indented part is called the scarf, this is where the looper threads form a lock) If not, it's the looper timing. If they seem to meet properly then check your needle. Is your needle up into the needle clamp all the way? Try a new needle. Even a slight bend to the needle will not allow the loopers to meet and grab or deliver thread. You might check the tensions. Thread has to have some resistance in order for the loopers to do their job,
If your looper timing is off, find a sewing repair person to retime the serger. Don't try it yourself or put this repair off. If the loopers go further out of timing, they might hit something and replacement can be costly.