Setting up
39
9.08 Adjusting the needle thread tension
Fig. 9 - 06
Shread and insert the bobbin case according to the required type of buttonhole, see ●
Chapter 9.03 Inserting the bobbin case / adjusting the bobbin thread tension.
Switch on the machine and select the required type of buttonhole ( purl or fl at buttonho- ●
les ) on the control panel, see Chapter 9.07 Selecting the type of buttonhole / bartack
For purl buttonholes ( A ):
Open tension unit ● 1 to the full extent and adjust tension unit 2 so that the stitches are in-
terlooped in the centre of the material.
Adjust tension unit ● 1 so that the interloops of the purl seam stitches are pulled upwards.
For fl at buttonholes ( B ):
Adjust tension unit ● 2 ( less tension ) so that the interloops of the stitches are pulled to
the bottom side of the material.
Carry out the adjustment with different coloured needle and bobbin threads.
56-017a
56-017b
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