Operation
30 Operating Instructions 171/173 - 02.0 - 09/2019
4.7 Thread tension
Together with the looper thread tension, the needle thread tension 
influences the final seam pattern. With thin sewing material, 
excessive thread tension can lead to undesired gathering and 
thread breakage.
Proper setting
If the tension of needle thread and looper thread is identical, the 
thread interlacing lies in the middle of the sewing material.
Set the needle thread tension so that the desired seam pattern is 
achieved with the lowest possible tension.
A differentiation is made between 3 seam types:
• Tight seams (1)
• Normal seams (2)
• Highly elastic seams (balloon stitch) (3)
Fig. 12: Thread tension 
(1) - Tight seam
(2) - Normal seam
(3) - Highly elastic seam 
(balloon stitch)