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Threading and tension
of
upper
thread"
Presser
foot,
throat
plate and feed motion"
The
tension
of
the
upper thread
is
negulated
with
tension
discs
4 by
means
of
a
grooved
screw.
Correct
tension
caR
be judged
by the
appearance
of
the
stitches.
The
red mark
on
the
icrew
serves
as
a
starting
point
whera
altering
the
tension.
The
tension
is
increased
when
the
screw
is
turned
to
the
right
and
reduced
when
it
is turned
to
the
left.
Right
tension
of
the
threads
is important
for all
kinds
of
sewing."
Thick
or
hard
materials
require
hard
tension
of
the
upper thread,
in
order
to
enable
it
to pull
up the
under
thread.
Thin or
loosely-woven
f
abrics
will
pucker
if
the
tension
of the
thread
is too tight. On the
other
hand,
slack
tension
on
thick
materials results
in
seams
that
,gape""
The
following
diagrams
illustrate
how
correct
and
f
aulty
rension
of the
thread
affects
the
stitching.
Presser
foot,
rthroat
plate,
feed
motion
and length
o[
stitches"
feet
are therefore supplied
with the
machine
(see
'Page
23)"
It
is
important
to
keep
the
edges
of
the
needle
hole
polished
and even, so
as
not to
damage
the
needle
or
thread.
Never,
therefore,
pull
the
material
while
sewing,
for
this
will
bend
the
needle,
which
may
strike
agains*
the
edges
of
the.needle
hole
and
damage them"
Fig.
14.
Fig.
Ls.
rela-
and
ten-
has
the
Fig.
L4
shows correct
tion
between
the
upper
lower
thread.
Fig.
15
shows
thar
the
sion
of the
upper
thread
been
to
slack,
or that
of
under thread
too
tight.
Fig.
16
shows
the
opposite;
the under thread
is
so
slack
that
it is
drawn
up
through
the material and
the
interloc-
king
of
stitches
is
visible
on
the
surf
ace.
Fig.
17
b.
The
feed
motion
can be
raised
or
lowered
by
turning
the
wheel
as
shown
in
Figs. 77 a and
b.
For
zig-zag and straight
seams,
the
symbol
in
the window
above
the
wheel
should
indicate
zrg-zag
or
straight
seams,
Fig.
L7
a; for
darning,
embroidery and
sewing
on
buttons,
it
should indicate
rhc
darning
sign,
FiS.
t7
b.
Length of
stitches"
Thc
lcrrgth
of
the
stitches
is
regulated
with
handle 1,
Fig.
18,
and
thc
lcngth
for
the
stitches
which
has
been
ser
can
be
seen
on
t
lr
c
scalc
to
the
left
of
the
handle.
The
movc-
ment
of
thc
lr.rndlc
is
arrested
for
each
length
of
stitch
[r]'
Fig.
L7
a.
FiS.
1,6.
Fresser'
foot, throat plate and feed motion.
The rype
of
presser
foor
must
be
adapted
to
the
k
inrl
.I
work
for
which
it
is
intended, and various types
of
l)r'('\\('l
14'
I5
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