Thread Tension; Setting The Needle Thread Tension - DURKOPP ADLER 581 Operating Instructions Manual

Operation
Fig. 23: Threading the gimp thread: Subclass 121 and 321 (2)
4.8

Thread tension

The thread tensions depend on the type and quality of the thread
as well as on the sewing material. The buttonhole looks best when
sewn with the lowest possible thread tension.
Overly tight thread tensions can result in undesired ruffing and
thread breakages with thin materials.
4.8.1

Setting the needle thread tension

The needle thread tension must generally be tighter than the
tension of the looper thread. The thread tension is electronically
regulated. It comprises the main tension for the sewing process
and a remaining residual tension (cutting tension) for tightening
the needle thread during the cutting operation below the throat
plate.
Regulate the residual tension (cutting tension) to suit the elasticity
of the needle thread used, so that the thread end hanging from
the needle is sufficiently long to ensure a safe sewing start.
34 Operating Instructions 581 - 01.0 - 05/2016