White 415 - Blind Stitch Selector [MODEL 415]; Adjusting Thread Tensions

BLIND
STITCH
SELECTOR
[MODEL
415]
Automatic
blind
hem
stitching
and
Pine-leaf stretch
hem
stitching
is
available
on
Model
415
with
blind
stitch
selector
to
the
left
The
former
is
made
with
stretch
stitch
lever
at
M
and
the
latter
is
with it
at
S.
For
both,
stitch
width
control
should
be
at
0.
In
ordinary
stitching,
this
control
be at
M
position.
In
shifting
the
control
to
position,
lift the
control
up a
little
bit,
then
shift
it
to
the
right.
CONTROLS:
ADJUSTING
THREAD
TENSIONS
Always
adjust
the
upper
thread
tension
with
the
presser
foot
down,
as
the
tension
is
released
when
it
is
raised.
To
increase
the
tension
on
the
upper
thread,
turn
tension
control
to
the
right.
To
decrease,
turn
to
the
left.
Before
adjusting
the
tension
be
sure
that
the
machine
is
threaded
properly.
It
is
seldom
required
to
adjust
the
bobbin
thread
tension,
however,
when
necessary
to
change
bobbin
thread
tension,
turn
small
screw
on
side
of
the
bobbir(cae
clockwise
to
tighten
,
counterclock
wise
to
lobsen.
When
both
tensions
are
properly
balanced,
a
perfect
stitch
will
be
formed
with
both
threads
interlock
ing
in
fabric
(A).
When
the
upper
tension
is
too
tight,
the
bobbin
thread
is
pulled
up
over
the
upper
thread
which
is
lying
flat
on
the
fabric
(B).
When
the
upper
tension
is
too
loose,
the
upper
thread
forms
loops
over
the
bobbin
thread
lying
flat
on
the
fabric
(C).
When
the
upper
and
bobbin
thread
tensions
are
balanced
but
fabric
is
puckered
in
sewing
direction
on
sheer
fabrics,
both
tensions
are too
tight.
Loosen
both
tensions
evenly.
It
is
recommended
to
adjust
the
tension
balance
under
medium
stitch
length.
In
case
of
satin
stitching
for
buttonholes
and
em
broidery,
slightly
loosen
the
upper
thread
tension.
[I
•
I
411
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18