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Faults
in
sewing"
If
the
upper rhread
breaks,
it
the
following
faulrs:
is
usuailv
caused
bv
any
oi
Upper
chread
wrongly
rrhreaded.
Upper
rhread tension
roo
tigh
r.
Bent
or
blunt
needle,
or
faurty
in
some
other
wa),.
Damaged
point
on the
shuttle.
Needle
hole
in
rhe rhroar
prare
damaged
bv
rhe
needle.
Thread roo
coarse
in
reration
[o
rhe
needle.
If
the under
nhread breaks,
ir
nrav
be
due
ro
rhe
facr
char
the
rension
spring
on rhe
bobbin
case
is roo tighr
or
rhar
the
needle
hole
in
the throat
plare
is
damaged.
Poor
qr"rality
thread
may also
be rhe .urrr.
of
thread
breaki'g- Good thread
shourd
be
f
ree
from
knors
and
should
resist
normal
rhread
tension.
Skipped stitches
are mosr
often
caused
by
a benr
or blu*t
needle,
or
orle
thar
has been
wronglv
inserred
in the
[:ar.
If
the
needle breaks,
it
rnay
be
due rci
ir
having
bee,
bent.
If it is
necessary
to pull the
material
in
certain kinds
oi
sewing,
this
musr be done
cautioustry
so
as
nor
to
bend
rhe
needle so
that
its point
strikes
againsr
the hole
in
the throar
plate.
This
wilt
often
make
it
break
a'ci
may
also
damage
the
needle
hole
oi
the rhroat
place.
If
the
material
puckers,
it is
tisually due
to the
rhread
being
too tightly
tensioned
in
relarion
ro
rhe
rhickness ot
the material
and
rhe
cension
should
rherefore
be loosened.
If
the
marerial
is drawn
cogerher
by
the
zig-zag
seam,
the
troubie
is
usually
the
same.
If
so,
reduce
the
rhread
tension.
If
the
machine
does
not
feed
the
marerial
sarisfactorily.,
it
may
be due
tro
rhe
feed
motion
being
filled wirh fluit
from
rhe
materiatr
and
the
feed
motion
shouuld
in
rhar
case
be
cleaned.
"t
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