DURKOPP ADLER 669 CLASSIC, Operating Instructions Manual

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Operation
Operating Instructions 669 - 00.0 - 08/2019 33
4.6.6 Setting the hook thread tension
Fig. 11: Setting the hook thread tension
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!
To set the tension spring :
1. Adjust the tension spring (3) with the screw (2). Turn until the
required tension force is present.
To increase the hook thread tension:
1. Turn the screw (2) clockwise.
To decrease the hook thread tension:
1. Turn the screw (2) counter-clockwise.
WARNING
Risk of injury from sharp and moving parts!
Puncture or crushing possible.
Switch off the machine before setting the hook
thread tension.
(1) - Brake spring
(2) - Screw (3) - Tension spring
①
② ③