[!]
Bobbin
case
installation
and
threading
(1) Pull
the
shuttle
race cover 0
forward
and
then
open
the
cover.
(2)
Lift
the
bobbin case latch and
remove
the
bobbin case.
III
Thread
tension
1 .
Bobbin
thread
tension
(3) Insert
the
bobbin
into
the
bobbin case, pass
the
thread
through
the
cut
line
8,
and
pull
it
out
through
the
thread
hole
8.
Make sure
the
bobbin
turns
in
the
direction
of
the
arrow
when
the
thread
is
pulled.
(4) Pass
the
end
of
the
thread
through
the
thread hole 8
.in
the
horn, and pull approxima-
tely
30
mm
of
thread out. ·
2.
Upper
thread
tension
* The bobbin thread tension should
be
adjusted so
that
the
bobbin
will
not descend
of
its
own
weight
when
suspended
by
the
bobbin thread. Turn
adjustment screw
0 to adjust.
Turn
the
thread
tension
control
nut
8
to
adjust
the
upper thread tension to the material being sewn.
Adjust
thread
tension control
nut
8 so
that
the
thread remainder is between 35
to
40
mm.
3. Thread
take-up
spring
height
Loosen screw 8 and turn the entire thread take-up
unit to adjust so that the height
of
the thread take-up
spring
is
6--8
mm.
4.
Thread
take-up
spring
tension
Increase
·.
Adjust
the
thread take-up spring tension by
turning
the
tension stud 8
with
a screwdriver.
-6-
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