Dürkopp Adler 650-10, Operating Instructions Manual

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Operation
Operating Instructions 650-10 - 03.0 - 08/2016 29
4.7.2 Setting hook thread tension
Proper setting
The hook thread tension must be set so that the resulting seam
pattern looks like the figure in (

p. 27 ).
At the recommended hook thread tension of e.g. 25 g (measured
with a full bobbin), 12.5 g should be generated by the braking
spring and 12.5 g by the tensioning spring.
The basic setting for the tensioning spring is performed as follows:
When the bobbin case contains a full bobbin it must sink slowly
under its own weight.
Fig. 10: Setting the hook thread tension (1)
The braking spring prevents the bobbin running on when the
thread has been cut.
CAUTION
Risk of injury from sharp and moving parts!
Cutting or crushing possible.
Switch off the machine before setting the hook
thread tension.