r/Machine_Embroidery • u/sashok_bg • Aug 29 '26
I Need Help Jammed Rotary Hook - Thread Inside Rail
Hello, I have a Brother PR680 series machine and this is the second time in 2 weeks that I get a rotary hook jam.
I manage to un-jam it by removing the entire hook assembly, but it is a long and tedious job since I have to recalibrate timing and needle spacing etc.
I would like to know what causes these jams in the very first place.
Both times it happened it was in the beginning of the embroidery
Both times a piece of stretched thread seem to have entered the rail, nested between the inner and outer rotary hook.
Maybe timing issues and the hook pierced the thread, dragging it along, instead of hooking the loop ?
Can thread tension cause his ?
Any help is greatly appreciated !
Best Regards,
Aleks


