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3.4 Setting the Thread Tensions

The thread tension of the needle thread must be

higher than that of the bobbin thread. The control

knob for the bobbin thread tension thus has a

spring of thinner wire.

Too high thread tensions cause a puckering of the

material.

Too low bobbin thread tensions can cause faulty

stitches.

For setting a greater thread quantity in the seam

see Section 3.5.

Furthermore, one can work with or without

pneumatic tension opening during the stroke of the

sewing foot.

The tension opening is necessary when the sewing

material with thread is to be pulled forward under

the sewing foot. Here the arm cover must be

removed and the coupling plug inserted into the

preattached coupling socket.

Attention!

When sewing corners with sewing foot stroke a

loose stitch results. Thus, pneumatic tension

opening should only be used when there is no

sewing foot stroke during the course of the seam.