Thread Take-Up Spring - Duerkopp Adler 669 Service Instructions Manual

2.12.2

Thread take-up spring

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Caution: Risk of injury!
Turn off the main switch.
Check and set the thread take-up spring only when the machine is
switched off.
Standard checking
The standard setting for the spring travel and spring tension only apply
to usual thread sizes.
Very thick or very thin threads or sewing material may require different
settings.
Spring travel
The thread take-up spring 1 has to keep the needle thread from the
moment of the thread lever lifting until the needle eye's penetrating of
the material under a light tension.
In order to achieve a regular seam with a low thread tension, the travel
of the thread take-up spring may be increased.
The thread take-up spring must only meet the stop when the needle
eye has penetrated the material.
Spring tension
The spring tension should be lower than the thread tension.
Correction
Spring travel
–
Loosen the screw 2.
–
Turn the stopping collar 4.
Turning counter-clockwise = larger travel
Turning clockwise = smaller travel.
–
Fasten the screw 2.
Spring tension
–
Loosen the screw 2.
–
Adjust the tension disc 3 without changing the stopping collar's 4
position.
Turning the disc clockwise = less spring tension
Turning the disc counter-clockwise = higher spring tension
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