Dürkopp Adler 650-16 Operating Instructions Manual page 35

Operation
Operating Instructions 650-16 - 01.0 - 06/2014
Figure 10: Setting the hook thread tension
(1) - Braking spring
(2) - Tension spring
Steps
1. Turn back the adjusting screw (3) so far that the tension on
the tensioning spring (2) is completely removed.
2. Bend the braking spring (1) such that half the recommended
hook thread tension value is applied through the braking
spring.
3. Insert the bobbin into the bobbin housing upper section and
thread in the hook thread  5.4 Winding the hook thread,
page 28.
4. Insert the bobbin housing together with the bobbin into the
hook.
5. Hold the free thread end tightly with one hand.
6. Turn the handwheel until the sewing machine performs one
stitch.
7. Pull the hook thread on to 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°. About half the tension value should be evident.
9. Then tighten the adjusting screw (3) up to the recommended
tension value.
2
1
(3) - Regulating screw
3
33