5 Thread tension
5.1 Needle thread and looper thread tension
The thread tensions are dependent on the type and quality of the
threads and fabrics. The buttonhole looks best if it is sewn with the
lowest possible thread tension.
Too tight thread tensions can lead to undesired ruffling and thread
breakage, particularly when processing thin materials.
Needle thread tension
In general the needle thread tension has to be tighter than the looper
thread tension. The needle thread tension is designed as an electronic
tension. It consists of the main tension for the sewing process and a
remaining tension (cutting tension) for tightening the needle thread
during the cutting operation under the throat plate.
Depending on the elasticity of the needle thread used, the remaining
tension (cutting tension) has to be adjusted in such a way that the
needle thread end hanging out of the needle is long enough to ensure
asafesewingstart.
–
Adjust the main tension for the sewing operation via the control
panel (see chapter 9.3.2 Adjusting the thread tension in the main
level).
–
Adjust the remaining tension (cutting tension) via the control panel
(menu item 130).
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