6.4 Adjusting the thread tension
6.4.1 Adjusting the hook thread tension
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 by the screw (1) with a screwdriver.
The tension is increased 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 below table, 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 Used needle-Number Tension in thread
grams
light 70 - 80 50
medium 90 - 110 65
heavy 120 - 160 90
17
EN
13
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