Adjusting The Hook-Thread Tension - Duerkopp Adler 609 Instruction Manual

6.6 Adjusting the hook-thread tension

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Adjusting the braking spring 1
The braking spring 1 prevents the idle motion of the bobbin when the
machine halts or during a jerky drawing of the hook thread for example
when pulling the thread of the thread-pulling knife.
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Unscrew the adjustment screw 5 until no tension remains in the
tension spring 3.
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Adjust the braking spring 1 with adjustment screw 4.
The braking force is correctly adjusted if the braking spring 1
is approx. 1 mm above the surface 2.
Adjusting the tension spring 3
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Adjust the tension spring 3 with adjustment screw 5.
To increase the hook-thread tension = turn screw clockwise
To decrease the hook-thread tension = turn screw anti-clockwise
For stitch formation see sketch on page 9.
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