Pfaff 339 Owner's Manual - Page 71
itinder, slips
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Uneven stitching 1. The thread is uneven or too thick - change the thread. 2. Tne tension is wrong - adjust it (see pages 24 and 25;. 5, The bobbin has been replaced impro perly check the position of the bob - bin in the bobbin case following in structions on pages 15 and 16. 3. Upper and bobbin thread do not un wind evenly because there is dirt lodg ed in the bobbin or between the tensian discs in the upper tension shell - clean the machine where necessary. 4. The needle is blunt or bent - change the needle. The bobbin itinder slips The friction surface is oily - take off the top cover and wipe the oil off the bobbin winder and the friction surface on the handwheel until they are dry. 73
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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