Operation
Operating manual 171/173 Version 01.0 - 01/201628
5.6 Adjusting the thread tension and quantity
5.6.1 Thread types and stitch formation
Both the thread tension and the thread quantity for stitch formation
must be adjusted to the desired seam appearance for both needle
thread and looper thread.
A differentiation is made between 3 seam types:
• Tight seams (1)
• Normal seams (2)
• Highly elastic seams (balloon stitch) (3)
Fig. 13: Different seam types
5.6.2 Adjusting the thread tension
Correct setting
The desired stitch formation is achieved.
The tension of the needle thread must be tighter than
the tension of the looper thread.
Faults due to incorrectly set tension
• Excessively tight tensions: Th
e sewing material
is pulled together
• Looper thread tension too loose: Missed stitches
The thread tension is adjusted using the adjusting wheels
of the relevant thread tensioner on the machine column.
(1) - Tight seam
(2) - Normal seam
(3) - Highly elastic seam
(balloon stitch)
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