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 t hread 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.