2.11.2 Thread controller spring
Caution: Danger of injury !
Switch off main switch.
Check and adjust the thread controller spring only when the sewing
machine is switched off.
Standard checking
The adjustment standards for spring travel and spring tension apply 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 1 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.
The thread controller spring must abut on the stop not before the
needle’s eye has penetrated the fabric.
Thread tension
The spring tension should always be lower than the needle thread
tension.
Correction
Spring travel
–
Loosen screw 2.
–
Turn stop bushing 4.
Turn counter-clockwise = longer spring travel
Turn in clockwise direction = shorter spring travel
–
Tighten screw 2.
Spring tension
–
Loosen screw 2.
–
Adjust tension disc 3 without changing the position of the stop
bushing 4.
Turn the disc in clockwise direction = less spring tension
Turn the disc counter-clockwise = more spring tension
–
Tighten screw 2 without changing the position of the stop bushing 4
and the tension disc 3.
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