Trouble Cause Reme
dy
1.
Needle
thread is broken.
(
1)
The tension
of
the tension ODecrease the tension
of
the tension
controller No.2 is too tight.
controller No.2
(2) The tension
or
the stroke
of
ODecrease the tension
or
the stroke
the take-up spring
is
too great.
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
of
the sewing
OReadjust the sewing book's timing
by the timing gauge.
hook.
O
Buff
the thread path by cloth files,
(5) The thread path has scratches.
etc.
(6) The needle is too thin.
OReplace by a thick needle.
2.Thread s.lips out
of
the
(I)
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 clamp trimmer driving plate B.
check is comming down. ODecrease the tension
of
the
(3) The whip stitch is not formed tension controller No.I.
at the start
of
sewing. OPerform correct threading.
(4) Wrong threading.
3.Wobbling stitches
(I)
The tension disc No.2 is too Oincrease the tens
ion
of
the
are
formed in the. loose. tension disc No.2
overedging
sea
ms. (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 tens
ion
is too tension (
15
to 20g for purl
hjgh. stitches).
4. Wobbling
st
itches are
(1) The tension disc No. I is too Olncrease the tension
of
the
formed
at
the
start
of
loose. tension disc No.I (
15
to 30g)
sewing.
(2) The position
of
the needle OLower the trinuner 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
spring is too great. clamp check.
ODecrease the stroke
of
the take-
up spring, and increase the spring
pressure.
5.
The
n
eedle
thread
at
the
(I)
The tension disc No.I is Oincrease the tens
ion
of
the
first
bar
tacking
comes
too loose.
tension disc No.I.
out
and lumps
on
the
(2) The bobbin thread tension ODecrease the bobbin thread
bottom
of
cloth. is too high. tension (15 to 20g).
6.Stitches float
over
cloth.
(1) Bobbin thread tens
ion
is Olncrease the bobbin thread
not enough. tension.
(2) Bobbin thread slips out
of
the OProperly thread the bobbin case.
thread path on the bobbin case.
7. Stitches
are
skipped.
(1) The work clamp check
is
too
O
Change
the work
clam
p
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
sewing
hook.
(Lower
the
needle bar
by
approx.
O.Smm
(1/2"))
From the library of: Superior Sewing Machine & Supply LLC
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