Operation Manual

6.4.2 Adjusting the needle thread tension

Adjusting the pre-tensioner (1)

–

Adjust the supplementary tensioner (1) so that it has the lowest

tension possible, but so high that, when taking out the sewn

material after the preceding trimming (when the tensioners (2)

and (3) are switched off), the thread is not pulled out of the

tensioner (1). (Tensioner (1) is not switched off at the foot lifting).

Adjusting tensioners (2) and (3)

ECO and CLASSIC machines with electro-magnetic control

–

The machine can be equipped with a lever (4) for the tensioner (2)

temporary switching off. In this case, two thread tension values can

be pre-selected and a good stitch tightening can be achieved when

sewing over a variable number of layers of the sewn material with

one seam.

–

Switch the tensioner off (2) with the lever (4) and sew on a smaller

number of layers.

–

Regulate the thread tension with the tensioner (3), till a good

thread loop is achieved (see below).

–

Switch the tensioner on (2) by the lever (4) shifting out and sew on

a greater number of layers.

–

Regulate the thread tension with a tensioner (2), till a good thread

loop is achieved (see below).

–

If the machine is not equipped with the lever (4), regulate the

tension by both tensioners (2) and (3) at the same time so that their

nuts are screwed approximately in the same height.