Operating instructions

4.11 Needle Thread Tension

At the factory the machine head is set so that buttonholes with

flat-form tacking and raised-form buttonhole seams are sewn.

Pre-tension

The pre-tension 4 is always in effect. It serves to quiet the needle

thread. The setting value should be very small (5-10 g). The

pre-tension 4 has little influence on the seam construct.

Main tension

The main tension 5 is effective when sewing the two buttonhole seams

of the buttonhole. The main tension 5 is open during sewing of the

tacking as well as during thread trimming.

Tacking tension

The tacking tension 6 opens only during thread trimming, otherwise

this tension is closed during the complete sewing procedure.

Buttonhole seam tension

The buttonhole seam tension is mutually generated by the main

tension 5 and tacking tension 6, whereby about 1/3 of the buttonhole

seam tension should be generated by the tacking tension 6.

Setting

–

Thread the needle thread so that it does not run through the main

tension 5.

–

Call up the "

One-time Sewing (1X)

" menu and sew a buttonhole.