Operation
Operating Instructions 650-10 - 03.0 - 08/201630
Fig. 11: Setting the hook thread tension (2)
You set the hook thread tension as follows:
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 50% of the recommen-
ded hook thread tension value is applied through the braking
spring.
3. Insert the bobbin into the bobbin case upper section and
thread in the hook thread ( p. 32).
4. Insert the bobbin case together with the bobbin into the hook.
5. Hold the free thread end tightly with one hand.
6. Turn the handwheel until the 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.
(1) - Braking spring
(2) - Tension spring
(3) - Regulating screw
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