Operation Manual

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 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 Used needle-Number Thread tension in

grams

light 70 - 80 50

medium 90 - 110 65

heavy 120 - 160 90