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Lervia KH 4000 Manual

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10. Settings
The tension of the upper and lower thread is
set correctly if the twining of the two threads
cannot be seen on the top or bottom sides of
the material after sewing.
If even one of the two tensions is not set cor-
rectly, an unclean seam will result. The stitches
will then lie flat on the material.
a) Setting the upper thread tension
• You can select the strength of the upper
thread tension by turning the selector wheel
for the upper thread tension
r
. If this thread
is ...
- too tight (higher setting), then the upper
thread is loose and the material is being
'sewed' with the lower thread only.
- too loose (lower setting), then the lower
thread is loose and the material is being
'sewed' with the upper thread only.
The upper thread tension is normally
between 4-6.
b) Setting the lower thread tension
• You can set the strength of the lower
thread tension by turning the screw
on the bobbin case
l
. Turn it ...
- clockwise to increase the tension.
- anti-clockwise to reduce the tension.
Be certain not to turn the screw
completely out of the bobbin case
l
.
• The lower thread tension is set correctly if
the bobbin case
l
can be turned slowly and
evenly ("fall down test").
18 f
18 f
Lervia KH 4000
r
l
18 f
IB_SewingMachine_UK 12.06.2006 14:52 Uhr Seite 15
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