<Adjusting the stitch tension >
1.
Bobbin thread tension
2.
Needle thread tension
3.
Thread take·UP spring
• Thread take-up spring operation range
• The bobbin thread tension varies with the
material
and
thread. Turn tension regulating
screw
0
to
adjust the tension.
The
standard
tension
Is 40
to
50 g
for
m~cHum·thick
to
thick materials when sewing
with
#50 spun yarn.
• Turn tension control nuts 8 to adjust the
needle thread tension.
Once the bobbin thread tension has been
adjusted, the needle thread tension adjustment
alone can provide a well-balanced, neat
seam.
o~H
? Well-balanced, neat seam
X~
{#
Excessive needle thread tension
Z:
or Insufficient bobbin thread tension
x?_
/
f=
H)
/ij Insufficient needle thread tension
..._
or
excessive bobbin thread tension
The standard operation range of thread take-up spring 0 is 7 to 1 0 mm.
To adjust the range of spring
0,
loosen screw 8 and turn stopper
8.
• Thread·take-up spring tension
The standard thread take-up spring tension is
20
to
40
g.
To adjust the tension, loosen screw 0
and
setscrew 0 and turn tension stud
8.
-27-
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