Setting The Needle Thread Tension - DURKOPP ADLER 670 Operating Instructions Manual

Operation
Operating Instructions 670/680 - 00.0 - 01/2017
4.7.1

Setting the needle thread tension

Fig. 13: Setting the needle thread tension
(4) - Main tensioner
(5) - Additional tensioner
Setting the pre-tensioner
When main tensioner and additional tensioner are open, a small
amount of residual tension of the needle thread is required.
This residual tension is generated by the pre-tensioner.
The pre-tensioner influences the length of the cut needle thread
end. The cut needle thread end is the initial thread for the next
seam. Reliable operation of the thread cutter can only be achieved
with a properly set pre-tensioner.
To set the pre-tensioner:
1. Turn the pre-tensioner (6) until the front side is flush with the
bolt.
• Set a shorter initial thread: turn counterclockwise
• Set a longer initial thread: turn clockwise
Setting the main tensioner
The main tensioner determines the normal tension during sewing.
Set the main tensioner as low as possible.
⑥
⑤
④
(6) - Pre-tensioner
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