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Workspace, tools, machinery, and manufacturing / [Juki 1181N] Thread unwinding, breaking while reversing...
« on: June 15, 2020, 12:23:24 PM »
Hi,
I have a Juki 1181N that I do most of my sewing on. It has been mostly trouble free but yesterday it started misbehaving. While reversing the the thread started partially breaking and bunching up before the needle eye.
I checked the needle timing and it was a tiny bit of so I adjusted it, swapped the needle and the throat plate since it started to be a bit worn. After that I haven't been able to get it to run good at all. If a go slow trough only two fabric layers its running ok while reversing, not good but ok. But as soon as I increase the speed or add more layers the thread starts forming large loops on the underside or breaks. It seems to start unwinding through the tension disc as you can see in the picture.

Forward it seems pretty fine, if I look closely it looks like the thread starts to unwind through the tension disc but I'm not really sure. The thread is Gutermann Mara 40 Z-twist but i also tried some other threads.
Anybody have any ideas of what to adjust or change?
I have a Juki 1181N that I do most of my sewing on. It has been mostly trouble free but yesterday it started misbehaving. While reversing the the thread started partially breaking and bunching up before the needle eye.
I checked the needle timing and it was a tiny bit of so I adjusted it, swapped the needle and the throat plate since it started to be a bit worn. After that I haven't been able to get it to run good at all. If a go slow trough only two fabric layers its running ok while reversing, not good but ok. But as soon as I increase the speed or add more layers the thread starts forming large loops on the underside or breaks. It seems to start unwinding through the tension disc as you can see in the picture.

Forward it seems pretty fine, if I look closely it looks like the thread starts to unwind through the tension disc but I'm not really sure. The thread is Gutermann Mara 40 Z-twist but i also tried some other threads.
Anybody have any ideas of what to adjust or change?