Operation Manual

2.3 Thread Tension
The tension of the needle thread (upper thread) must be greater than
that of the hook thread (lower thread).
Too great thread tensions cause a puckering of the material. A too low
hook thread tension leads to missing stitches.
–
Set the needle thread tension with the knurled screw 1.
–
Set the hook thread tension with the knurled screw 2.
2.4 Upper Thread Quantity for Sure Stitch Formation
With elastic sewing yarns (e.g. synthetic fiber yarns or monofilament
yarns) a certain upper thread quantity must be drawn off
for assured
stitch formation
.
Elastic sewing threads: Non-elastic sewing threads:
1
2
3
4
5
3
4
5
8