Operation Manual

Settings via the software
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Operating Instructions 841 - 00.0 - 09/2014
6.2 Manual sewing mode parameters
6.3 Setting the needle thread tension
1. Switch the machine on and reference it.
2. Select the thread tension menu item.
3. Select the value for buttonhole seam and tacking ( 6.5 Pro-
gramming mode parameters, page 41 and  6.6 Selectable tacking
types, page 43).
4. Enter value and confirm by pressing OK.
Increasing the needle thread tension in the second third of the bobbin
The needle thread tension can be increased as a percentage up to fives
times to obtain a constant sewing result on the bobbin as the amount of
remaining thread decreases.
1. Select the thread tension menu item and scroll right down to the
bottom.
2. Enter a value for counter 1 for buttonhole counting.
3. Enter an increase in needle thread tension as a percentage, see table
in the example below.
4. For further increases in needle thread tension, start again at step 1 for
counters 2 to 5.
Example for increasing the needle thread tension to guarantee the
quality for the buttonhole in the second third of the bobbin:
1. In the U-thread menu 120 buttonholes might be set, the counter needs
to be activated, i.e. be set to on – The placket item must be deactivated
i.e. set to off.
2. After 70 buttonholes have been sewn, the machine should increase the
overall thread tension (zigzag/tacking) by 2%.
3. After 90 and 100 buttonholes have been sewn, it should be increased
by 1% again.
Symbol Parameters Meaning
Basket • Using the OK button, the sewing basket can be
vented and lowered.
• The same function is applied by pressing the
P button.
Start • Using the OK button, the sewing process can be
started.
The sewing basket is lowered and the currently
selected buttonhole is sewn.
• The same function is applied by pressing the
S button.