Operation
16 Operating Instructions 513/533 - 01.0 - 09/2023
4. When using silicone oil, also thread the needle thread through
the optional silicone lubricator (1).
3.2 Adjusting the needle thread tension
Fig. 2: Adjusting the needle thread tension
Needle thread pretension
If the main tension (2) is open, a small amount of residual tension
of the needle thread is required. The residual tension is generated
by the pretension (1).
The pretension also affects the length of the cut needle thread
end (starting thread for the next seam).
To adjust the needle thread pretension:
1. Turn the pretension (1) clockwise (- direction) for a shorter
starting thread.
2. Turn the pretension (1) counterclockwise (+ direction) for a
longer starting thread.
Needle thread main tension
To adjust the needle thread main tension:
1. Set the main tension of the needle thread (2) to be as low as
possible.
The thread interlacing should be exactly in the middle of the
(1) - Pretension (2) - Main tension
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