Dürkopp Adler M-TYPE 667, Инструкция по эксплуатации

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3.8 Setting the hook thread tension
Fig. 10
Brake spring
The brake spring 1 is responsible for preventing a bobbin overrun when the
machine stops 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.
Increasing the hook thread tension
– Turn screw 3 clockwise.
Decreasing the hook thread tension
– Turn screw 3 counter-clockwise.
Caution: Risk of injury!
Switch off the main switch.
The hook-thread tension may only be adjusted with the sewing machine
switched off.
4
3 2
1