I have a Janome my lock 634D. The left needle thread seems to be caught by teh upper looper thread in front of the needle and then it will pull and eventually break. I am sewing cloth diapers and I was only sewing 2 layers of an OLD bathroom towel into a soaker pad... If I run it through just one layer it does fine .. Any ideas what teh problem is?? Am I just trying to serge through to many layers???? I had serged less than 10 inches and it happened about 6 times.. QUITE discouraging and frusterating.. I just had it serviced not long ago.....
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overlockers and sergers are annoying in that every time you change materials and threads they must be re-tensioned.
Get a scrap piece of material. Thread your machine correctly according to the instructions in your manual. If no manual most sergers are threaded, upper looper, lower looper then needles from right to left. Make sure you thread with the presser foot UP.
You want to balance the stitches Begin by adjusting the looper dials, you want them to meet right at the cut edge. Then adjust your needles. Keep doing test seams until you have them balanced. If you are a novice... try threading with each thread point having it's own color. That will help you identify which thread is giving you fits.
I would suggest that you check the needles again, make sure they are both fully up into the needle housing. Also they should be at different heights in order to form the stitch sequence.
It is important that you thread the loopers first in the sequence shown in your manual, then the needles. So you may need to recheck the threading again and make sure the threads are in all the eyes correctly, especially the lower looper. Also some overlockers, have a sliding eye on the lower looper for ease of threading, if yours does, make sure it has been slid back to normal operating position.
When you have checked the threading up, take all four threads under the raised pressure foot and make sure that the upper looper thread and lower looper threads are not crossing over each other. Lower the pressure foot and try to chain off again. I hope this helps you to resolve the issue.
I scanned my manual for it, and it can be downloaded for free here.
The gist of it, is that you should do the lower looper first, upper looper, right needle, then left needle. From the front of the machine, this is starting with the rightmost holes on the threadguide plate, and finishing with the leftmost holes on the threadguide plate.
I had a similar problem with my machine. What I've started doing with mine is setting the stitch length at 3 and the differential feed ratio at 1.0 then I set all 4 thread tensions at 3. I thread the machine from right to left, and then when everything seems to be working okay I take scrap material to test the tension and then set them to suit the material I'm using. Right now I'm working with a twill so my settings are 4-4-5-5. This seems to have stopped the thread slipping off the bottom looper and I haven't had any more needles break. I hope this is helpful.
It is impossible for a looper to come unthreaded if you are holding one end and the other is still feeding off the spool. Somewhere a thread broke - must be either the upper looper or the needle. Try completely re-threading your machine. Many machines have an "order" they prefer to be threaded. Try starting from the right tension guide and work to the left.