Husqvarna Zig Zag - Presser foot, throat plate, and feed motion; Adjusting feed motion; Stitch length regulation

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