Setting The Hook Thread Tension - Duerkopp Adler 550-16-23 Operating Instructions Manual

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.
9
10
3
1
13