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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.
4
5
6
1
19
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