Note
on
Items 1 and 2:
Broadcloth tends to pucker
so
that the thread tension must be decreased
as
much
as
possible.
Use
a single type presser foot for efficient feeding.
Note on Item 3:
If wooly nylon thread
is
used for double chain stitches, it can resist stretching up to 130 to 150%.
Jersey tends to deviate much
so
decrease the presser pressure
(to
2 to 3kg) and use a double type presser foot.
Remarks:
If
a single type presser foot
is
used except when sewing thin materials, initial stitches may skip, the thread
may break, and chaining-off thread break may occur.
Note
on
Item
5:
Denim also tends to deviate much
so
that the presser pressure must be decreased to 2 to 3
kg
{by about
12
to
15
screw
threads).
Use
gauge parts for denim specification.
8.
TROUBLE
SHOOTING
[]]
THREAD BREAKAGE (Overlock Stitch
Needle)
CHECK POINT
ADJUSTMENT
PAGE
1 Wrong threading.
-
Refer to "Threading diagram."
l
2
Excessive pressure
of
tension disc.
-
Adjust to proper pressure.
28
l
3 Poor thread quality.
-
Use
thread
of
good quality.
-
l
4
Needle groove or needle eye poorly finished
-
Change needle for a good one.
l
5
Wrong position
of
looper thread take-up.
-
Adjust to proper position.
24
l
6
Needle thread passage has flaws.
-
Change thread guide for a new one.
l
7 Needle plate has flaws.
-
Change it for a new one or smooth surface
with oil stone or buff.
Fmws~
8 Under looper has flaws.
-
Change it for new one or smooth surface
18
with oil stone or buff.
Flaws
lf==Blunt
9 Wrong timing
of
needle and looper.
-
Adjust to proper timing, needle clearance
19
and position
of
needle guard.
-32-
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