Bernina bernette just stopped sewing . have rethreaded many times . both needless put thread through material but the looper thread does not get caught by them top or bottom , so no loops are formed just two rows of straight stitches that pull out easily. can not see anything obviously wrong. but something is.
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The 335 has a two thread chain stitch (stitch type 401), and the overlock side (right needle side), is a three thread plain overlock. If you are describing the plain overlock as the problem, I would first suggest the following in re-threading:
1. Thread the upper looper
2. Thread the lower looper
3. Thread the needle last (important)
If the needle threaded, you cannot re-thread the lower looper without breaking the thread.
In order to thread the lower looper, the lower looper must pass by the needle thus picking up the needle thread. So, instead of threading the lower looper thread underneath the needle thread, the looper would be threaded on top and cannot sew without breaking the thread.
Make sure that the threads are bedded between the tension disks. Check this by stretching the thread fore and aft of the tension disks as well as visually noting that the threads are not accidentally threaded behind the disks. You can also loosen the tension disks when threading so as to allow the threads to bed deeply between the disks.
Please reply with your observations.
Grasp the threads and hold them down when you start your seam. If it still happens make sure your thread is seated into your upper tension mechanisms. If that still isn't solving your problem... CLEAN between the tension discs with some sturdy fabric folded in half. (wax build up from threads can cause issues)
Try rethreading all the threads making sure you thread in the recommended order: Upper Looper first, Lower Looper second with the tail Crossing Over the Upper Looper as the last step, then thread the needles.
I had read where someone said their lower looper tension dial had pulled apart. Sure enough, mine had too. We snapped it back together and Voila problem solved!
I have found with any serger I have used that you have to cut the looper (bottom) threads before re threading the needle threads. You then rethread the loopers. If you don't do this, the needle threads keep breaking. Hope this helps.
It could be that there is a loose piece of thread, or some fluff which is obstructing the tension gauge. Try blowing around the theading area (or even run the hoover pipe near it to see if you can **** it out). I cleared mine by folding a piece of non fluffy material and rubbing gently between the tension dial and machine.
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