Duerkopp Adler 550-12-12 Operating Instructions Manual - Page 6
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2.3 Thread Tension
2.4 Upper Thread Quantity for Sure Stitch Formation
Elastic sewing threads:
8
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.
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.
3
4
5
Non-elastic sewing threads:
1
2
3
4
5