Bernina Artista 730 Manual - Page 75

Missing, stitches

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to clean the shuttle race from jammed thread ends and lint, using the brush to do so. Never use hard instruments, such as screwdrivers a. s. o. to perform this, as otherwise the shuttle race might get damaged. After this cleansing has been done, replace first shuttle, then close locking bridge 56 with shuttle race cover 57, and finally insert again bobbin case. Make sure that the locking bridge has engaged correctly; el the shuttle race has been oiled correctly with a few drops of oil zee fig. 20); fl no thread ends are stuck between the thread tension discs; gi no thread ends are jammed under the bobbin case tension spring; h ) the machine can easily be started with handwheel. 2. The causes of upper thread breaking may be the following: a) The use of badly polished needles of inferior quality. Needles should always be purchased at a BERNINA shop; b) Needle incorrectly set. Long groove must always be in front; e) Needle is bent or blunt; d) The relation between size of thread and needle is not the right one (see table on page 13); e) Upper tension thread is too tight; f) Thread of bad quality, full of knots. Thread dried out by too long storage. Thread should never be stored in heated rooms. If the machine has been in use for a long time, thread breaking may have a cause only a competent sewing machine mechanic can deal with; g) Stitch plate hole has been damaged by the needle and requires re-polishing; h Shuttle point is damaged. 3. Cause of under thread breaking can be: a) Under thread tension too tight: b) Under thread badly wound on bobbin; el Bobbin is deformed and jamming in the case; dl Stitch plate hole has been damaged by the needle and requires re-polishing (ask the expert!). 4. Missing stitches may be caused by: a) using unsuitable needles of other make. Always use needles of system 705: b) needle is bent; c) needle not correctly set; long groove must always be exactly in front: when inserting needle push it up as far as it will go: 73

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to
clean
the
shuttle
race
from
jammed
thread
ends
and
lint,
using
the
brush
to
do
so.
Never
use
hard
instruments,
such
as
screwdrivers
a.
s.
o.
to
perform
this,
as
otherwise
the
shuttle
race
might
get
damaged.
After
this
cleansing
has
been
done,
replace
first
shuttle,
then
close
locking
bridge
56
with
shuttle
race
cover
57,
and
finally
insert
again
bobbin
case.
Make
sure
that
the
locking
bridge
has
engaged
correctly;
el
the
shuttle
race
has
been
oiled
correctly
with
a
few
drops
of
oil
zee
fig.
20);
fl
no
thread
ends
are
stuck
between
the
thread
tension
discs;
gi
no
thread
ends
are
jammed
under
the
bobbin
case
tension
spring;
h
)
the
machine
can
easily
be
started
with
handwheel.
2.
The
causes
of
upper
thread
breaking
may
be
the
following:
a)
The
use
of
badly
polished
needles
of
inferior
qua-
li
ty.
Needles
should
always
be
purchased
at
a
BERNINA
shop;
b)
Needle
incorrectly
set.
Long
groove
must
always
be
in
front;
e)
Needle
is
bent
or
blunt;
d)
The
relation
between
size
of
thread
and
needle
is
not
the
right
one
(see
table
on
page
13);
e)
Upper
tension
thread
is
too
tight;
f)
Thread
of
bad
quality,
full
of
knots.
Thread
dried
out
by
too
long
storage.
Thread
should
never
be
stored
in
heated
rooms.
If
the
machine
has
been
in
use
for
a
long
time,
thread
breaking
may
have
a
cause
only
a
com-
petent
sewing
machine
mechanic
can
deal
with;
g)
Stitch
plate
hole
has
been
damaged
by
the
needle
and
requires
re
-polishing;
h
Shuttle
point
is
damaged.
3.
Cause
of
under
thread
breaking
can
be:
a)
Under
thread
tension
too
tight:
b)
Under
thread
badly
wound
on
bobbin;
el
Bobbin
is
deformed
and
jamming
in
the
case;
dl
Stitch
plate
hole
has
been
damaged
by
the
needle
and
requires
re
-polishing
(ask
the
expert!).
4.
Missing
stitches
may
be
caused
by:
a)
using
unsuitable
needles
of
other
make.
Always
use
needles
of
system
705:
b)
needle
is
bent;
c)
needle
not
correctly
set;
long
groove
must
always
be
exactly
in
front:
when
inserting
needle
push
it
up
as
far
as
it
will
go:
73