Adjusting The Needle Thread Tension - Duerkopp Adler 669 Instruction Manual

6.2

Adjusting the needle thread tension

3 2 1
Pre-tensioner
When the main thread tensioner 2 and the supplementary tensioner 3
are open, there must still be a slight tension remaining on the needle
thread. This residual tension is created by the pre-tensioner 1.
The pre-tensioner 1 influences both the length of the cut needle thread
and the starter thread for the next seam.
–
Basic adjustment:
Turn dial 4 until its front side is flush with the bolts 5.
–
For a shorter starter thread:
Turn the dial 4 clockwise.
–
For a longer starter thread:
Turn the dial 4 counter-clockwise.
Main tensioner
The main tensioner 2 should be adjusted as little as possible. The
threads' cross-over point should be in the centre of the material.
If the thread tension is too strong, crimping and thread tearing
canoccur when working with a thin material.
–
Adjust the main tensioner 2 so that you attain a consistent stitch
pattern.
To increase the tension,turn the dial clockwise.
To decrease the tension, turn the dial counter-clockwise.
Supplementary tensioner
The switchable supplementary tensioner 3 is used for quick changes to
the thread tension (for example, when working with thicker seams).
–
The supplementary tension 3 should be set lower than the main
tension 2.
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