Adjusting The Needle-Thread Tension - Duerkopp Adler 869 Instruction Manual

6.2 Adjusting the needle-thread tension

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Pre-tension
When the main tensioner 2 and supplementary tensioner 3 are open,
the needle thread must be under slight residual tension. This residual
tension is produced by the pre-tensioner 1.
The pre-tensioner 1 simultaneously affects the length of the end of the
severed needle thread (the starting thread for the next seam).
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Basic setting:
Turn knurled nut 4 until its front is flush with the bolt 5.
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To shorten the starting thread:
Turn knurled nut 4 clockwise.
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To lengthen the starting thread:
Turn knurled nut 4 counter-clockwise.
Main tension
The main tensioner 2 should be set to the minimum possible tension.
The interlacing of the threads must be in the center of the material.
With thin material excessive thread tension can cause unwanted
gathering and thread breakage.
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Adjust the main tensioner 2 so that the stitches are uniform.
To increase tension - Turn the knurled nut clockwise
To decrease tension - Turn the knurled nut counter-clockwise
Supplementary tension
The supplementary tensioner 3 is used for rapid change in
needle-thread tension during operation (e.g. with thickened seams).
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Set the supplementary tensioner 3 lower than the main tensioner 2.
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