Trouble
Cause
Remedy
1.
Need
le thread is broken.
(1) The tension of the tension ODecrease the tension
of
the tension
controller No.2 is too tigh
t.
controller No.2
(2) The tension
or
the stroke
of
ODecrease the tension
or
the stroke
the take-up spring is too grea
t.
of
the take-up spring.
(3) Blade point
of
sewing hook
OBuff the blade point
of
the sewing
has burr or scratches.
hook
or
replate the sewing hook.
(4) Poor timing
ofthe
sewing
OReadjust the sewing hook' s timing
by the tirning gauge.
hook.
OBuff the thread path by cloth files
,
(5) The thread path has scratche
s.
etc.
(6) The needle is too thin.
OReplace by a thick needle.
2.Thread slips
out
of
the (J) The needle thread trimmer
OMove back the needle thread
needle. opens too early. trimmer driving plate B.
(2) The needle thread trimmer OMove back the needle thread
opens when the work
cI
amp trimmer driving plate B.
check is comming down. ODecrease the tension
of
the
(3) The whip stitch is not formed tension controller
No.l
.
at the start
of
sewing. OPerform correct threading.
(4) Wrong threading.
3.Wobbling stitch
es
(l)
The tension disc No.2 is too OIncrease the tension
of
the
are
formed in the. loose. tension disc No.2
overedging seams. (2) The tension and stroke
of
the OReadjust the take-up spring.
take-up spring is not enough.
ODecrease the bobbin thread
(3) Bobbin thread tension is too tension
(1
5 to 20g for purl
high. stitches).
4. Wobbling stitches are
(1) The tension disc No.l is too OIncrease the tension
of
the
formed
at
the
start
of
loose.
tension disc No. l (15 to 30g)
sewmg.
(2) The position
of
the needle OLower the trimmer as low as
thread trimmer is too high.
possible
, provided
it
does not
(3) The stroke
of
the take-up
come in contact with the work
spnn
g IS too grea
t.
cI
amp check.
ODecrease
th
e stroke
of
the take-
up spring
, and increase the spring
pressure.
5.
The
needle thread
at
the (1) The tension disc No.l is OIncrease the tension
of
th
e
first
bar
tacking
comes
too loose.
tension disc
No.l.
out
and
lumps
on
the
(2) The bobbin thread tension
ODecrease
th
e bobbin thread
bottom
of
cloth. is too high. tension
CI
5 to 20g).
6.Stitches float
over
cloth.
(1) Bobbin thread tension is Olncrease the bobbin thread
not enough. tens
lO
n.
(2) Bobbin thread slips out
of
the OProperly thread the bobbin case.
thread path on the bobbin
ca
se.
7. Stitches are skipped.
(1) The work clamp check is too
O
Change
the
work
clamp
check
large for the buttonhole.
with a smaller one.
(2) The cloth is made
of
light-
ODelay the
time
of
the
needle
weight materials.
and
the
s
ewing
hook.
(Lower
the
needle bar
by
approx. O.5mm (1/2"))
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