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4.
Thread-guiding parts
4.1 Thread controller spring
Caution: Danger of injury!
Switch off main switch.
Check and adjust thread controller spring only when the button
sewing automat is switched off.
Standard checking
The adjustment standards for spring travel and spring tension refer to
normal needle thread sizes.
In case of extremely thick or thin needle threads or fabrics different
adjustments may be required.
Spring travel
The thread controller spring 2 must hold the needle thread under a
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
it possible to further increase the thread controller spring travel.
The thread controller spring must abut on the stop not before 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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