~
NEEDLE BREAKAGE
CHECK
POINT
ADJUSTMENT
PAGE
1
Poor thread quality.
-
Use
thread
of
good quality.
l
2
Needle size
too
small.
-
Change it for more large one.
l
3
Needle
is
not
center
of
needle plate slot.
-
Adjust to proper position.
17.
18
!
4
Needle and looper
out
of
proper relation.
-
Adjust the position
of
needle guard and
19
I
looper properly.
5
Wrong adjustment
of
needle guard.
-
Adjust to proper position for needle guard.
19.21
~
IMPROPER THREAD TENSION
CHECK POINT
ADJUSTMENT
PAGE
1 Poor thread quality.
-
Use
thread
of
good quality.
!
2 Needle size
too
small.
-
Change it for more large one.
l
3
Too weak pressure
of
tension disc.
-
Adjust to proper pressure.
28
!
4 Wrong position
of
thread take-up.
-
Adjust
to
proper position.
24.25
I§] WRONG CHAINING-OFF
(Overlock
Stitch)
CHECK POINT
ADJUSTMENT
PAGE
1 Wrong threading.
-
Refer to thread diagram.
!
2
Excessive pressure
of
tension disc.
-
Adjust
to
proper pressure 28
l
3
Too weak pressure
of
tension disc.
-
Adjust
to
proper pressure. 28
l
4 Wrong position
of
looper thead take-up.
-
Adjust
to
proper position.
24
l
5
Wrong position
of
needle thread take-up.
-
Adjust
to
proper position.
16
l
6
Wrong installment
of
chain feed dog.
-
Adjust
to
proper position.
24
!
7
Needle plate has flaws.
-
Change it for
.a
new one, or smooth with
stone oil and buff.
~·
8 Wrong timing between needle and looper.
-
Adjust
to
proper timing.
18.
19
-36-
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