Bernina 730 Manual - Page 74

Avoid, Machine, Trouble

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HOW TO AVOID MACHINE TROUBLE First we should like to give you some hints how machine troubles might be avoided, what may be their cause, and how to remedy them. 1. On principle ... In most cases troubles are resulting from faulty manipulations of the machine. However, should other causes be presumed, the machine has to be examined, whether: a) the needle is correctly set. The long groove should always be in front and the needle threaded from front to back; b) the needle is the correct size for the thread; for darning of fine fabrics use needle size no. 70, for other sewing work needle size no. 80 or no. 90. Re sizes of needles and threads see page 13; c) the machine is properly cleaned. Remove free arm cover plate and clean all lint. Cleanse feed dog with the brush; d) shuttle race is properly cleaned. This cleansing is made in the following way: For proper care and thorough cleansing of the machine the shuttle should be removed from time to time out of its race. Raise needle bar to its uppermost position and with the thumb of left hand press down spring lever part 55 to the left of shuttle race, thus enabling the locking brigde 56 to swivel down together with shuttle race cover 57. After having withdraen bobbin case with shuttle, it will be easy Fig. 95 a 56 • 72

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HOW
TO
AVOID
MACHINE
TROUBLE
First
we
should
like
to
give
you
some
hints
how
machine
troubles
might
be
avoided,
what
may
be
their
cause,
and
how
to
remedy
them.
1.
On
principle
...
In
most
cases
troubles
are
resulting
from
faulty
manipulations
of
the
machine.
However,
should
other
causes
be
presumed,
the
machine
has
to
be
examined,
whether:
a)
the
needle
is
correctly
set.
The
long groove
should
always
be
in
front
and
the
needle
threaded
from
front
to
back;
b)
the
needle
is
the
correct
size
for
the
thread;
for
darning
of
fine
fabrics
use
needle
size
no.
70,
for
other
sewing
work
needle
size
no.
80
or
no.
90.
Re
sizes
of
needles
and
threads
see
page
13;
c)
the
machine
is
properly
cleaned.
Remove
free
arm
cover
plate
and
clean
all
lint.
Cleanse
feed
dog
with
the
brush;
d)
shuttle
race
is
properly
cleaned.
This
cleansing
is
made
in
the
following
way:
For
proper
care
and
thorough
cleansing
of
the
machine
the
shuttle
should
be
removed
from
time
to
time
out
of
its
race.
Raise
needle
bar
to
its
uppermost
position
and
with
the
thumb
of
left
hand
press
down
spring
lever
part
55
to
the
left
of
shuttle
race,
thus
enabling
the
locking
brigde
56
to
swivel
down
together
with
shuttle
race
cover
57.
After
having
withdraen
bobbin
case
with
shuttle,
it
will
be
easy
Fig.
95
56
•
a
72