Adjusting The Needle Thread Tension; Needle Thread Quantity For Safe Stitch Formation - Duerkopp Adler 171 Instruction Manual

6.3

Adjusting the needle thread tension

6.4

Needle thread quantity for safe stitch formation

3
14
The needle thread tension has to be tighter than that of the looper
thread.
Increase the needle thread tension: Turn setting wheel 1 in clockwise
direction.
Reduce the needle thread tension: Turn setting wheel 1
counter-clockwise.
Too tight thread tensions cause puckering of the material.
A too loose looper thread tension may lead to skipped stitches.
1
In case of elastic sewing threads, e.g. synthetic fibre threads or
monofilament threads, a certain needle thread quantity must be pulled
to guarantee a safe stitch formation.
This is done in thread lever position "down" in conjunction with the
thread regulator 2.
Adjust the thread regulator in position "down" of the thread lever 4 as
follows:
In case of elastic sewing threads the lower thread bore is visible.
Thread the needle thread past the bow 3 on the left (see fig. a).
In case of less elastic sewing threads, as e.g. cotton, the upper thread
bore is visible. Thread the needle thread past the bow 3 on the right
(see fig. b).
4
fig. a
2
3
fig. b
4