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6. Operation
6.1 Threading the needle thread
Caution - danger of injury !
Turn off the main switch!
The needle thread may only be threaded with the sewing
machine switched off.
Thread the needle thread as shown in the illustration.
6.2 Adjusting the needle-thread tension
Pre-tensioners 1
The pre-tensioners 1 should be set at a lower tension than the main tensioners 3.
Adjust the pre-tensioners 1 by turning the knurled nuts.
After making major changes to the pre-tensioners 1, readjust the main tensioners 3.
Main tensioners 3
The main tensioners 3 should be set to the minimum possible tension.
The looping of the threads must be in the centre of the material (see fig. a).
With thin material excessive thread tension can cause unwanted gathering and thread
breakage.
Adjust the main tensioner 2 so that the stitches are uniform.
Supplementary tensioner 2
The supplementary tensioner 2 can be switched in to effect a rapid change in
needle-thread tension during operation (e.g. with thickened seams, on the flap when
backstitching the front edge of a jacket or overcoat).
Set the supplementary tensioner 2 lower than the main tensioner.
The supplementary tensioner 2 is switched on during operation at the keypad on
the sewing-machine arm.
When the supplementary tensioner is switched on the LED over the relevant key
lights up.
6.3 Opening the needle-thread tensioners
The main tensioners 3 and supplementary tensioner 2, if it is switched on, open
automatically:
when the sewing feet are lifted electro-pneumatically (see section 6.9).
GB
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