Duerkopp Adler 271 Betriebsanleitung - Seite 13
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3.3 Replacing the Bobbin and Setting the Looper Thread Tension
- Risk of Injury -
Turn the main switch off!
Removing the Bobbin
Lift up lid 3 and remove the upper part of the bobbin case
with the bobbin.
3
4
Inserting the Bobbin
The insertion of a new, filled bobbin can be seen in the
following illustration.
The thread is pulled in the slit a under the leaf spring b up
to the hole c. When the thread is pulled off the bobbin
must turn in the direction of the arrow.
Important Note!
In order that the bobbin brake spring 5 can move freely
the area behind it is to be cleaned at regular work
intervals of sewing dust. Raise the spring, e.g. with a
needle, and blow out.
6
5
6
7
Setting the Looper Thread Tension
With a recommended looper thread tension of e.g. 30g,
15g should be achieved through the brake spring 5 and
15g through the tension spring 7.
As the base position of the tension spring 7 the following
applies:
Allow the bobbin case to slowly lower through its own
weight. See sketch.
The brake spring 5 blocks the run-on of the bobbin during
thread trimming.
Set its braking effect sensitively.
15