White 4050 - CHECK LIST FOR BETTER SEWING

—34—
t.
CHECK
LIST
FOR
BETTER
SEWING
IF
MATERIAL
IS
NOT
FED
IF
UPPER
THREAD
BREAKS
1.
Feed
dog
is
down.
1.
Upper
threading
is
not
correct.
2.
Pressure
on
presser
foot
is not
enough.
2.
Needle
eye
is
not
sharp.
3.
Stitch
length
regulator
is
at
“0”
-
no
feeding.
3.
Upper
thread
is
too
large
for
needle
eye.
=
4.
Upper
thread
tension
is
too
tight.
5.
Needle
is
inserted
incorrectly.
IF
NEEDLE
BREAKS
1.
Needle
is
inserted
incorrectly.
2.
Needle
clamp
screw
is
loose.
IF
LOWER
THREAD
BREAKS
3.
Bent
needle
is
used.
1.
Lower
thread
is
entangled
in
shuttle.
4.
Upper
threading
is
not
correct.
2.
Lower
thread
tension
is
too
tight.
5.
Upper
thread
tension
is
too
tight.
3.
Lower
threading
is
not
correct.
6.
Wrong
needle
and
thread
for
cloth
being
sewn
are
used.
7.
Material
pulled
excessively.
IF
MACHINE
SKIPS
STITCHES
1.
Needle
is
not
sharp
and
straight.
2.
Needle
is
inserted
incorrectly.
IF
LOOPS
FORM
ON
FABRIC
3.
Wrong
needle
and
thread
for
cloth
being
1.
Tension
of
upper
or
lower
thread
is
wrong.
sewn
are
used.
4.
Upper
threading
is
not
correct.
5.
Lint
is
clinging
to
under-side
of
needle
IF
MATERIAL
BECOMES
CR
EASY
plate.
1.
Thread
tension
is
too
tight.
2.
Threading
is
not
correct.
3.
Thread
is
caught
by
something.
IF
MACHINE
RUNS
HEAVY
OR
NOISY
4.
Lower
thread
is
unevenly
wound
on
bobbin.
1.
Machine
is
in
need
of
oiling.
2.
Lint
is
accumulated
on
shuttle
and
teeth
of
feed
dog.
If
your
machine
skips
stitches
only
on
certain
fabris,
try
all
of
the
above
procedures
before
calling
a
repairman.
Check
the
needle
plate
area,
if
there
are
scratches
and
marks
around
the
needle
hole
opening,
your
machine
is not
being
cleaned
properly.
Always
remove
the
needle
plate
and
clean
the
feed
dogs
periodically.
Improper
and
lack
of
cleaning
will
cause
an
accu
mulation
of
lint
which
hampers
the
feeding
mechanism,
this
in
turn
will
cause
the
operator
to
impatiently
pull
or
push
the
cloth
causing
the
needle
to
bend
and
strike
the
plate,
foot
or
hook,
causing
a
slip
in
the
timing
mechanism.
Continuous
striking
will
cause
defects
making
it
necessary
to
call
a
serviceman.