DURKOPP ADLER 540-100-1, Manual Complete

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3.7 Thread tension (540-100)
Thread tension 1
The tension serves the purpose of sewing flat-form tacks and
buttonhole seams.
The tension is always effective and opens only with thread cutting.
Thread tension 2
The thread tension can be switched on and off. The complete tension
of thread tension 1 and thread tension 2 generate raised-form tacks
and buttonhole seams. The selection can be freely programmed for
each buttonhole section of a buttonhole.
The tension is only effective if programmed and opens during thread
cutting.
Check:
–
Thread the needle and hook thread with different coloured yarn.
–
Make a trial seam.
–
For the flat parts of the buttonhole the cross-over point of the
thread should be in the middle of the material.
Setting: Change the thread tension 1
–
For the raised parts of the buttonhole the cross-over point of the
thread should be on the top side of the material.
Setting: Change the thread tension 2 until the seam pattern is
regular.
With the correct setting, in the flat buttonhole parts the upper thread
and in the raised buttonhole parts only the looper thread will be visible
on the material top side.
Increase tension Turn knurled nut clockwise.
Reduce tension Turn knurled nut anti-clockwise.
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1
1
2