Bernina 740 Manual - Page 72

Bernina 740 Manual

Get Bernina 740 PDF manuals and user guides View all Bernina 740 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 72 highlights

ft Thread of bad quality, full of knots. Thread dried out by too long storage. Thread should mover be stored in healed rooms. If the machine has been in use for a fairly long time, thread breaking may have a rause only a competent sewing machine mechanic can deal with; gi Stitch place hole has been damaged by the needle and requires re-polishing: ask for the specialist. h I Shuttle point is damaged. 3. Cause of under thread breaking run be: al Under thread tenqion t.s. tight; III under thread badly wound on bobbin; c1 Bobbin is deformed and jams in the bobbin ease: Stitch plate hole has been damaged by the needle and requires re-polishing. Call for a skilled sewing machine mechanic. 4. Missing stitches May be caused by: al using unsuitable needles of other make. Always employ needles of system 130: b) needle is bent: c i needle not correctly set. Long groove must always be exactly in front. When inserting needle push It up as far as it will go: d) needle of inferior quality or badly polished: ei size of needle is not fit for size of thread, or vice versa. 5. Needle breaking may have the following masons: ai Needle holder screw Is not securely tightened: Upper thread tension is too tight: c ) The material has been pulled from under the presser foot towards the front. after having finished with the sewing work. Thereby the needle got bent. Always remove the cloth from the machine by pulling it back from under the presser foot base: in Size of needle end sire of thread are not in correct relation together. Often the needle is too thin for to thick a yarn. whereby the needle becomes bent of course: et Use of thread of inferior quality. showing knots or unevenly twisted: 11

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
ft
Thread
of
bad
quality,
full
of
knots.
Thread
dried
out
by
too
long
storage.
Thread
should
mover
be
stored
in
healed
rooms.
If
the
machine
has
been
in
use
for
a
fairly
long
time,
thread
breaking
may
have
a
rause
only
a
competent
sewing
machine
mechanic
can
deal
with;
gi
Stitch
place
hole
has
been
damaged
by
the
needle
and
requires
re
-polishing:
ask
for
the
specialist.
h
I
Shuttle
point
is
damaged.
3.
Cause
of
under
thread
breaking
run
be:
al
Under
thread
tenqion
t.s.
tight;
III
under
thread
badly
wound
on
bobbin;
c1
Bobbin
is
deformed
and
jams
in
the
bobbin
ease:
Stitch
plate
hole
has
been
damaged
by
the
needle
and
requires
re
-polishing.
Call
for
a
skilled
se-
wing
machine
mechanic.
4.
Missing
stitches
May
be
caused
by:
al
using
unsuitable
needles
of
other
make.
Always
employ
needles
of
system
130:
b)
needle
is
bent:
c
i
needle
not
correctly
set.
Long
groove
must
al-
ways
be
exactly
in
front.
When
inserting
needle
push
It
up
as
far
as
it
will
go:
d)
needle
of
inferior
quality
or
badly
polished:
ei
size
of
needle
is
not
fit
for
size
of
thread,
or
vice
versa.
5.
Needle
breaking
may
have
the
following
masons:
ai
Needle
holder
screw
Is
not
securely
tightened:
Upper
thread
tension
is
too
tight:
c
)
The
material
has
been
pulled
from
under
the
presser
foot
towards
the
front.
after
having
fi-
nished
with
the
sewing
work.
Thereby
the
needle
got
bent.
Always
remove
the
cloth
from
the
machine
by
pulling
it
back
from
under
the
presser
foot
base:
in
Size
of
needle
end
sire
of
thread
are
not
in
cor-
rect
relation
together.
Often
the
needle
is
too
thin
for
to
thick
a
yarn.
whereby
the
needle
be-
comes
bent
of
course:
et
Use
of
thread
of
inferior
quality.
showing
knots
or
unevenly
twisted:
11