Operation Manual

Uneven
stitching
1. The
thread
is uneven
or
too thick
— 5,
The bobbin
has
been
replaced
impro
change
the thread.
perly
— check
the position
of
the bob
bin
in the bobbin
case
following
in
2. Tne
tension
is wrong
— adjust
it
(see
structions
on pages
15 and 16.
pages 24
and 25;.
3. Upper and
bobbin
thread
do not
un
wind
evenly because
there
is dirt lodg
ed in
the bobbin
or between
the ten-
The
bobbin itinder
slips
sian discs
in the upper
tension shell
—
clean
the
machine
where
necessary.
The
friction
surface is
oily — take
off
the
top
cover and
wipe
the oil
off
the bobbin
4. The
needle is
blunt or
bent
— change
winder
and
the
friction surface
on the
the
needle.
handwheel
until they
are dry.
73