The needle thread
tension
is increased by
turning
tension
nut M
clockwise,
and decreas
ed, by turning it counter-clockwise (Fig. 13).
The bobbin thread tension is regulated by means of the small hook screwdriver. Turn
tension screw z in for more tension, or out, for less tension
(Fig.
15).
The tensions should be regulated according to the material to be sewn. Check to see
that the
stitches
are
tightly
drawn
in
without
puckering
the
material,
in
straight
sewing,
the
stitches
should
lie
in
a
straight
line,
and
in
zigzag
sewing,
should
form
a
perfect
zigzag pattern on the lop and
bottom
of the material
without
kinking.
Fig. 15
The grade of thread used plays an important part in obtaining a perfect seam on any
material. Sheer fabrics require a thin and soft thread, whereas stiff and resistant threads,
because of their low resilience, are unsuitable for almost any fabric.
You will
have
to
have
a little
experience
in
order
to be
able
to tell which
tension
needs
adjustment.
Fig. 16
Fig.
17
Fig.
18
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