Pre-Setting The Shuttle Thread Tension - Duerkopp Adler 669 Instruction Manual

6.8 Pre-setting the hook thread tension
1
16
4
Caution: danger of injury !
Turn the main switch off.
Only adjust the hook thread tension when the machine is turned off.
Brake spring
The brake spring 1 is responsible for preventing a bobbin overrun
during a machine stop and when the hook thread is being cut. It cannot
be adjusted!
Setting the tension spring
–
Adjust the tension spring 4 with the adjustment screw 3. Turn until
the required tension force is present.
Raising the hook thread tension
–
Turn the screw 3 clockwise.
Decreasing the hook thread tension
–
Turn the screw 3 counter-clockwise.
2
3