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 s ewn with the
lowest possible thread tension.
Too tight thread tensions can lead to undesired ruffling and thread
breakage, particularly when processing thin materials.
Upper thread tension
In general the upper thread tension has to be tighter than the looper
thread tension. The upper 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 upper thread
during the cutting operation under the throat plate.
Depending on the elasticity of the upper thread used, the r emaining
tension (cutting tension) has to be adjusted in such a way that the
upper thread end hanging out of the needle is long enough to ensure a
safe sewing start.
–
Adjust the main tension for the sewing operation via the control
panel (see chapter 10.3.3 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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