Thread-Guiding Parts; Thread Take-Up Lever - Duerkopp Adler 511 Service Instructions Manual

4.

Thread-Guiding Parts

4.1

Thread take-up lever

Caution – Risk of injury !
Turn the main switch off.
Check and adjust the thread controller spring only when the
automatic bartacker is switched off.
Rule and control
The adjustment rules for spring travel and spring tension refer to
normal needle thread sizes.
In the cases of extremely thick or thin needle threads or fabrics,
different adjustments may be required.
Spring path
The thread controller spring 2 must hold the needle thread under minor
tension from the highest position of the thread lever to the moment the
needle's eye penetrates the fabric.
In order to achieve a uniform seam pattern with a low thread tension, it
is possible to further lengthen the path of the controller spring.
The thread controller spring must abut on the stop after the needle's
eye has penetrated the fabric.
Spring Tension
The spring tension should be lower than the needle thread tension.
2
3
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