14
9.
Settings
The tension in the upper and lower
thread has been set
correctly
if no
twining of the thread is visible on the
top or on the underside of the material
after sewing.
If the tension on only one of the threads
is set
incorrectly,
the resulting seam
will be untidy. The stitches lie flat on the
material, seams are not formed and the
material is not drawn through.
a)
Setting the upper thread
tension
You can use the thumbwheel for the
upper thread tension
to set the
tightness of the upper thread. If this
thread is ...
- too tight
(higher setting), then the
upper thread is loose and the mate-
rial is being 'sewed' with the lower
thread only.
- too loose
(lower setting), then the
lower thread is loose and the mate-
rial is being 'sewed' with the upper
thread only.
The upper thread tension is normally
set between 4 and 6.
b)
Setting the lower thread
tension
You can turn the
screw
on the
bobbin case to set the tightness of
the lower thread. Turn it ...
- clockwise
to
increase
the tension.
- anticlockwise
to
reduce
the ten-
sion.
The lower thread tension has been
set correctly if the bobbin case
unwinds slowly and evenly ("Drop
test").
IB_Sewingmachine_content_UK.qxd 22.07.2004 12:21 Uhr Seite 14
