• THREAD BREAKAGE (Double
Chain
Stitch
Needle)
CHECK POINT
ADJUSTMENT
PAGE
1
Wrong threading.
-
Refer to threading diagram.
l
2
Excessive pressure
of
tension disc.
-
Adjust to proper pressure.
31
l
3
Poor thread quality.
-
Use
thread
of
good quality.
l
4
Needle groove or needle eye poorly fmished.
-
Change needle for a good one.
l
5
Wrong position
of
chain stitch needle thread guide. -
Adjust to proper position.
16
l
6
Wrong position
of
looper thread take-up.
-
Adjust to proper position.
25
l
7 Needle thread passage has flaw.
-
.Change thread guide for a new one.
l
8 Double chain stitch looper has flaw.
-
Change it for a new one or smooth surface
20
with oil stone
or
buff.
~Blunt
Flaws
9 Wrong adjustment
of
needle guard.
-
Adjust to proper clearance between needle
21
and needle guard.
\
~
-
~Clearance
10
Wrong timing
of
needle and looper.
-
Adjust to proper timing.
21
121
THREAD BREAK (Looper Thread)
CHECK
POINT
ADJUSTMENT
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
Wrong position
of
looper thread take-up.
Adjust to proper position.
24
l
5
Looper thread passage has flaw.
Change thread guide for a new one.
l
6
Needle plate has flaw.
Change it for a new one and smooth surface
with oil stone
or
buff.
-33-
To Next Page
Loading...
