DURKOPP ADLER 281 Operating Manual page 33

Operation
Operating manual 281 Version 06.0 - 05/2013
Figure 15: Adjusting the tension values for the hook thread
(1) - Braking spring
Adjusting the tension values for the hook thread tension
1. Turn back the adjusting screw (3) such that the tension on the
tensioning spring (2) is completely removed.
2. Bend the braking spring (1) such that 50% of the
recommended hook thread tension value is applied through
the braking spring (1).
3. Insert the bobbin into the spool housing upper section and
thread in the hook thread ( Section 5.4 Inserting and winding
on the hook thread, page 23).
4. Insert the spool housing together with the bobbin into the hook.
5. Hold tight the free thread end with one hand.
6. Turn the handwheel until the sewing machine carries out one
stitch.
7. Pull the hook thread onto the upper side of the needle hole
using the needle thread.
8. Remove the hook thread in the direction of sewing at an angle
of 45°.
 Fifty percent of the tension value should be achieved.
9. Then tighten the adjusting screw (3) up to the total tension
value.
②
①
(2) - Tensioning spring
(3) - Adjusting screw
③
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