Dürkopp Adler 868-M Operating Instructions Manual page 51

Operation
Operating Instructions 868-M - 01.0 - 12/2020
Fig. 31: Setting the needle thread tension (2)
(4) - Adjusting wheel
Pre-tensioner
The pre-tensioner (1) generates a residual tension of the needle
thread. When main tensioner (3) and additional tensioner (2) are
open, a small amount of residual tension of the needle thread is
required.
The pre-tensioner also affects the length of the cut needle thread
and, thus, the length of the initial thread for the new seam.
Proper setting
Turn the adjusting wheel (4) until the front side is flush with the
bolt (5).
To set the length of the initial thread:
Shorter initial thread
1. Turn the adjusting wheel (4) of the pre-tensioner (1) clockwise.
Longer initial thread
1. Turn the adjusting wheel (4) of the pre-tensioner (1) counter-
clockwise.
⑤ ④
(5) - Bolt
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