Duerkopp Adler 550-16-26 Manual de instrucciones - Página 10
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4.7 Setting the Hook Thread Tension
8
5
Caution Risk of Injury!
Turn the main switch off .
Set the hook thread tension only with the machine turned off.
Half of the necessary hook thread tension should be created by the
brake spring 8 and halb by the tension spring 5.
Setting the tension spring
–
The bobbin case top 3 should slowly lower under is own weight
(see right illustration).
–
Set the tension spring 5 at the adjusting screw 10 until the
necessary tension value is reached.
Note:
The hook thread tension should amount to 20 +/- 5 grams.
10
3
1
13