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6.4
Adjusting the thread tension
6.4.1
Adjusting the hook thread tension
3
Caution! Risk of injury!
Turn off the main switch.
The hook thread tension may only be adjusted with the machine
switched off.
–
Adjust the hook thread tension via the screw (1). Insert a
screwdriver through the hole (2).
Increase the tension by tightening the screw.
–
Measure the thread tension with a dynamometer. Thread the
thread according to the picture and pull in the arrow direction (3).
This tension is adjusted in the factory in dependence on the
selected sewing equipment according to the table below, and it is
suitable for the usual sewing operations.
For sewing thin soft materials, it is necessary to reduce the
tension. If the seam is to be tightened strongly, it is necessary to
increase the tension and reduce the sewing speed at the same
time.
–
Thread tension of the hook located to the left of the needle is
adjusted and measured in a similar way. For this hook, the tension
is set up by 10 - 20 % lower than for the hook on the right.
Hook thread tension mean value
Sewing category
light
medium
heavy
1
2
Used needle-Number
70 - 80
90 - 110
120 - 160
Thread tension in
grams
50
65
90
13
GB
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