Operation
Operating Manual 512/532 Version 00.0 - 12/201322
4.2 Setting the needle thread tension
Figure 2: Setting the needle thread tension
Preliminary tension of the needle thread
With an open primary tensioner (2) a small amount of residual
tension of the needle thread is required. The residual tension is
generated by the preliminary tensioner (1).
The preliminary tension also affects the length of the cut needle
thread end (starting thread for the next seam).
1. Turn the preliminary tensioner (1) clockwise (– direction) for
a shorter starting thread.
2. Turn the preliminary tensioner (1) counterclockwise
(+ direction) for a longer starting thread.
Primary tension of the needle thread
1. Set the primary tension of the needle thread (2) to be as low
as possible.
The thread interlacing should be exactly in the middle of the
material being sewn. With thin sewn material, excessive thread
tension can lead to undesired ruffing and thread breakages.
①
②
(1) – Preliminary tensioner knurled nut (2) – Primary tensioner
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