No.
2
3
Break
ow
n
Therad
br
ea
kage
Skipping
stitch
Twist
ed
stitches
Cause
I Poor thread quality
2 Thread being too
thi
ck
3 Fusing thread due to
hi
gh
temper
at
ure
of
needle
caused by machin
es
operation at high speed
4 Tension being too
hi
gher
5
Br
eakage
of
needle,
lo
oper, throat
pl
ate, and
needle gua
rd
at the
location
of
thread guide
6 Failure to adjust thread
amount
!.Skipping stitch
of
needle
thread (leaking
of
two stitches
due to the loopers
fa
ilure to
hook the
need1
e thread)
2. skipping stitch
of
bobbin
thread (leaking
of
one stitch,
needle failure to ent
er
the
looper eyelet)
3.
Skipping stitch when thread
of
chemical fribre be
in
g
in
use
4.Skipping stitch when thread
of
polyester fibre being in use
1. Needle thread tension being
too low.
2.
Bobb
in thread tension being
too low
3.
Sewing thread being too
thi
ck
4. Improp
er
po
sition
of
the
frame thread
ey
elt.
S.lmproper
position
of
thread
take-up tension plate
6. Throat plate
Measures to be taken
1.
Quality thread to be used.
2.
R
ep
lacement t.o be made
by
an appropriate thread
3.
Silicone oil to be used a
nd
speed to be reduced
4. The tension nut to be loosen
ed
5.
Fir
st grinding with oil stone and then polishing
6. Adjusting the thread amount adjusting plate
1.
Adjusting thread-hooking amount
of
looper.
2.
Adjusting clearance
bet
ween looper and n
ee
dle.
3.
The
timing
of
needle
in
reference to looper.
4. Adjusting the thread-amount adjusting
pl
ate on
thr
ead
amount chang
in
g conditions.
5. Adjusting the frame thread eyelet.
6.
Checking whether the mounting positon
of
the
needle is proper
or
not.
7.
To
see if
th
e location
of
needle guard is
in
an
appropriate way and
the timing
of
it is weU
regulated in relation to another.
8.
To see
if
th
e needle thread threading is
in
a proper
way.
1) Reference to the above cases I and 2, as to skipping
stitch
of
the needle
of
the needle thread.
2) To see
if
th
e timing
of
bobbin thread cam has been
we
ll
reulated.
3) Increas
in
g tension
of
bobbin thread a
bi
t
hi
ghe
r.
4) To see if the threading
of
bobbin thread is
in
a
correct way.
1)
Using sillicone oil
2) Reduc
in
g speed
3)
Using needle for threead
of
chemical fibre.
I Reducing speed
2 Silicone oil to be used
l. Tightening tension nut
of
needle thread.
2. Tightening tension nut
of
bobbin thr
ea
d.
3.
Needle of large size to be used.
4. Read
ju
sting
it
to a proper position.
5. Readjusting its position
in
an appropriate way.
6.
the eyelet
of
thr
oa
t plate to be used be
ing
bi
gger
than normal on
e.
-14-
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