SINGER 1371A2 User Manual
Page 40
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Trouble
Cause
Remedy
Page
1. Needle thread is bro- (1) The tension of the tension controller
O Decrease the tension of the tension
ken.
No. 2 is too tight.
controller No. 2
20
(2) The tension of the stroke of the take-up
O Decrease the tension or the stroke of the
spring is too great.
take-up spring.
20
(3) Blade point of sevnng hook has bvirr or
O Buff the blade point of the sewing hook,
scratches.
or replate the sewing hook.
(4) Poor timing of the sewing hook.
O Readjust the sewing hook's timing by the
29
timing gauge.
(5) The thread path has scratches.
O Buff the thread path by cloth files, etc.
16
(6) The needle is too thin.
O Replace by a thick needle.
13
2. Thread slips out of
(1) The needle thread trimmer opens too
OMove back the needle thread trimmer
the needle.
early.
driving plate B.
31
(2) The needle thread trimmer opens when OMove back the needle thread trimmer
the work clamp check is coming dovra.
driving plate B.
31
(3) The whip stitch is not formed at the
O Decrease the tension of the tension
start of sewing.
controller No.l.
20
(4) Wrong threading.
O Perform correct threading.
16
3. Wobbling stitches
(1) The tension disc No. 2 is too loose.
O Increase the tension of the tension disc
20
are formed in the
(2) The tension and stroke of the take-up
No.2.
overedging seams.
spring is not enough.
O Readjust the take-up spring.
20
(3) Bobbin thread tension is too high. O Decrease the bobbin thread tension (15 to
20
g for purl stitches).
20
4. Wobbling stitches
(1) The tension disc No. 1 is too loose.
O Increase the tension of the tension disc
20
are formed at the
(2) The position of the needle thread
No. 1 (15 to 30g),
start of sewing.
trimmer is too high.
O Lower the trimmer as low as possible.
31
(3) The stroke of the take-up spring is too provided it does not come in contact with
great.
the work clamp check.
O Decrease the stroke of the take-up
spring, and increase the spring pressure.
20
5. The needle thread
(1) The tension disc No. 1 is too loose.
O Increase the tension of the tension disc
at the first bar tac-
No. 1.
20
king comes out
(2) The bobbin thread tension is to high.O Decrease the bobbin thread tension (15 to
and lumps on the
20
g).
bottom of cloth.
20
6
. Stitches float over
(1) Bobbin thread tension is not enough.
O Increase the bobbin thread tension.
20
cloth.
(2) Bobbin thread slips out of the thread
O Properly thread the bobbin case.
path on the bobbin case.
16
7. Stitches are ski-
(1) The work clamp check is too large for
O Change the work clamp check with a
pped.
the buttonhole.
smaller one.
22
(2) The cloth is made of light-weight
O Delay the timing of the needle and the
materials.
sewing hook, (lower the needle bar by
approx. 0.5mm (1/64"))
29
37