Thread-Guiding Parts; Thread Controller Spring - Duerkopp Adler 910 Service Instructions Manual

4.

Thread-guiding parts

4.1 Thread controller spring

22
Caution: danger of injury!
Turn off the main switch.
Check and adjust thread controller spring only when the sewing unit is
switched off.
Note and control
The adjustment standards 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.
Path of spring
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