Bernina 742 Manual - Page 71

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HOW TO AVOID MACHINE TROUBLE First of all we should like to give you some hints how machine troubles might be avoided, then what may be their cause, and finally how to remedy them. I. On principle In most cases troubles are resulting from faulty manipulationa of the sewing machine. However, if other causes arc presumed, the machine should be examined, whether: a) the needle has been correctly inserted. The long groove should always be In front, i.e. on the side where the machine has to be threaded ; b) the needle is the correct size for the thread used; for darning of fine fabrics take needle mire no. 70. and for other sewing work needle size no. 80 or no. 90. As regards sizes of needles with corresponding threads see page 13; c) The machine is properly cleaned. Remove free arm cover plate and clean all lint thereunder. Then cleanse feed dog with brush; d) shuttle is properly cleaned with but a few drops of oil (see fig. 181: c) no thread ends arc stuck between the thread tension discs; f) no thread ends are jammed under the bobbin ease tension spring: g) the sewing machine can easily he alerted with the handhweel. Noir; Make if a ricir oilcans to raise firreott talcr-up lever to its newest position: it will help to avoid lot !), ainehint froribteA. 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; bl Needle incorrectly set. Remember that long groove must always be in front ; c) Needle in blunt or bent; d) The relation ebtween size of thread and needle is not o. k. (see table on page IS): et Upper tension thread is too tight; 70

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HOW
TO
AVOID
MACHINE
TROUBLE
First
of
all
we
should
like
to
give
you
some
hints
how
machine
troubles
might
be
avoided,
then
what
may
be
their
cause,
and
finally
how
to
remedy
them.
I.
On
principle
In
most
cases
troubles
are
resulting
from
faulty
manipulationa
of
the
sewing
machine.
However,
if
other
causes
arc
presumed,
the
machine
should
be
examined,
whether:
a)
the
needle
has
been
correctly
inserted.
The
long
groove
should
always
be
In
front,
i.e.
on
the
side
where
the
machine
has
to
be
threa-
ded
;
b)
the
needle
is
the
correct
size
for
the
thread
used;
for
darning
of
fine
fabrics
take
needle
mire
no.
70.
and
for
other
sewing
work
needle
size
no.
80
or
no.
90.
As
regards
sizes
of
needles
with
cor-
responding
threads
see
page
13;
c)
The
machine
is
properly
cleaned.
Remove
free
arm
cover
plate
and
clean
all
lint
thereunder.
Then
cleanse
feed
dog
with
brush;
d)
shuttle
is
properly
cleaned
with
but
a
few
drops
of
oil
(see
fig.
181:
c)
no
thread
ends
arc
stuck
between
the
thread
tension
discs;
f)
no
thread
ends
are
jammed
under
the
bobbin
ease
tension
spring:
g)
the
sewing
machine
can
easily
he
alerted
with
the
handhweel.
Noir;
Make
if
a
ricir
oilcans
to
raise
firreott
talcr-up
lever
to
its
newest
position:
it
will
help
to
avoid
lot
!),
ainehint
froribteA.
2.
The
causes
of
upper
th
read
breaking
may
be
the
following:
a)
The
use
of
badly
polished
needles
of
inferior
Quality.
Needles
should
always
be
purchased
at
a
Bernina
shop;
bl
Needle
incorrectly
set.
Remember
that
long
groove
must
always
be
in
front
;
c)
Needle
in
blunt
or
bent;
d)
The
relation
ebtween
size
of
thread
and
needle
is
not
o.
k.
(see
table
on
page
IS):
et
Upper
tension
thread
is
too
tight;
70