White 219R - Page 7

8
PDJUSTING
THE
TENSIONS
PLACING
BOBBIN
CASE
A /
B
Fig.
8
Raise
needle
bar
to
highest
position,
arid
lift
hinged
cover
plate.
(See
15
Fig.
1)
I-bId
the
bobbin
case
latch
(0,
Fig.
8),
between
the
thumb
and
forefinger
of
the
left
hand,
with
at
least
three
inches
of
thread
running
from
the
top
of
the
bobbin
case
to
the
right.
Insert
and
center
the
bobbin
case
on
the
stud
of
the
shuttle
body,
(C).
Be
sure
the
bobbin
case
linger
(E)
is
opposite
the
shuttle
race
notch,
(A).
Press
the
bobbin
case
)B)
into
the
shuttle
as
far
as
possible
until
latch
catches
on
the
center
post
of
the
shuttle.
Then
release
the
bobbin
case
latch,
(0).
Press
bobbin
case
again
after
latch
has
been
released
to
make
sure
the
bobbin
case
is
locked
securely.
Close
the
cover
plate.
Always
adjust
the
upper
tension
with
the
presser
foot
down,
as
the
tension
is
released
when
it
is
raised.
To
increase
the
tension
on
the
upper
thread,
turn
dial
(Fig.
9)
to
the
right.
To
decrease,
turn
to
the
left.
Before
adjusting
lower
tension
be
sure
that
the
machine
is
threaded
properly.
When
necessary
to
change
the
bobbin
tension,
turn
small
screw
(Fig.
10)
on
side
of
the
bobbin
case
clockwise
to
tighten,
counterclockwise
to
loosen.
When
the
upper
tensions
are
properly
balanced,
a
perfect
stitch
will
be
formed
with
both
threads
interlock’
ing
in
fabric
(Fig.
11).
When
the
upper
tension
is
too
tight,
the
lower
thread
is
pulled
up
over
the
upper
thread
which
is
lying
flat
on
the
fabric
(Fig.
12).
When
the
upper
tension
is
too
loose,
the
upper
thread
forms
loops
over
the
tosser
thread
lying
flat
on
the
fabric
(Fig.
13>
Fig.
to
Fg.
ii
F 15
12
Fig.
13
Fig.
9