9.2 Thread Tension Lift
Standard checking
Spring travel:
The thread controller spring 4 must keep the needle thread under a
minor tension from the raised position of the thread lever to the moment
the needle’s eye penetrates the material.
The thread controller spring 4 must abut on the stop not before the eye
of the needle has penetrated the material.
Spring tension:
The required tension of thread controller spring 4 depends on the
material to be sewn.
Caution: Danger of injury !
Switch off main switch.
Adjust thread controller spring only w hen sewing machine is
switched off.
Correction
Set spring tension:
–
Loosen core pin 1.
–
Pull complete thread guide unit out of the machine casing.
–
Loosen core pin 1.
–
Twist bolt 2 until the desired spring tension is reached.
–
Tighten core pin 1.
–
Mount thread guide unit.
–
Tighten core pin 3.
Set spring travel:
–
Loosen core pin 3.
–
Twist complete thread guide unit with bolt 2.
–
Tighten core pin 3.
–
Check whether the above-mentioned points are fulfilled.
If not, the adjustment has to be corrected.
40
1
4
2
3
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