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..........".-
Tension
of
under
thread.
Threadling and tension
of
upper
thread.
pressing
the button
as
shown
in
Fig.
10.
The
bobbin
lies
inside
the
case,
which
is
pushed
on
to
the
pin
in
the
shuttle"
The flap on the
bobbin
case
can
be opened
with
a
grip
as
shown
in
Fig.
tr7,
and
the
bobbin
case
with
bobbin can
rhen
be removed.
Tension of under
thread"
The
tension
of
the under thread
can
be
regulated
by
rneaRs
of
the
tension spring
on
the
outside
of
the bobbin case.
If
the
tension
is
to
be
altered,
this is
done
with
the
a.id
of
the
little
screw
driver,
to
turn the screw of
the
spring.
The
tension
of
the
thread
is
tightened
when
the
screw
is
turned
to
the
right and
loosened
when
the
screw'
is
turned
to
the
treft"
Usually llq
to llz
rurn
is
sufficient
to
effect
nhe
alteration.
On
delivery,
the
under thread
is
adjusted
for
normal
ten-
sion,
which
only
needs
ro
be
changed
if
very
thin
or
espe-
cially
thick
materials are
ro
be
used"
If
frequent
changes
are
.made f',rom sewing
thread
ro
dar.ning
thread,
it
mayj
be
'ad-
visable
to
procure an extrd bobbin
case,
so
that
each
case
can be
kept at its parricular
tension.
Threading and tension
of
upper
rhread.
Vhen
threading the upper thread, the take-up lever
.sh,,rrl,l
bein
its
highest
position (1, FiS.
13).
The
thread is
gtri.l,.,l
d
Threading and tension
of
upper
thread"
f'rom
the
reel
through
thread-guides
2
and
3, down
between
the
tension
discs
4, over the
regulating
spring 5, under
the
thread-guide 6,
then
upwards
to
the take-up
lever
1,
through
which the
thread
is
passed
from right
ro
lef
t,
downwards
through
thread-guide
7
and
into
thread-guide
8 on
the
needle
bar,
after
which
it
is
passed
through
the
eye
of
the
needle
from
front to
back
and
pulled
our
a
finger
lengrh.
FiS.
1,2.
Fig.
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