Stitch Failures And Corrective Measures; Specifications - JUKI MO-2404 Instruction Book

S T I T C H F A I L U R E CAUSES
C O R R E C T I V E M E A S U R E S
1. Needle breaking
( l )
N e e d l e t y p e l s w r o n g .
(2) Needle count is not correct.
(3) Needle is not installed correctly.
(4) Needle is not straight.
(5) Needle-to-needle guard is inadequate.
(6) Needle-to-looper relation is inadequate.
o Use a specified needle.
o Use a needle size suitable to the thread gauge
and type of fabrics.
o Install the needle in the correct way (See 8).
o Use a straight needle.
o Correct the relation (See 20).
o C o r r e c t t h e n e e d l e t o l o o p e r r e l a t i o n ( S e e 1 5 ) .
2. Cloth is not cut
( I ) Position of the upper and lower knife is
inadequate.
(2) Knife blade has worn out.
o Adjust the knife position ( See 1 9).
o Sharpen the lower knife or renew the upper
knife.
3. Stitch skipping
( l )
( 2 )
( 3 )
( 4 )
( s )
Needle-to-looper relation is wrong.
Looper blade is blunt.
Needle is threaded with S-twist (or left-
hand twist) thread.
Thread tension is wrong.
Double chain looper thread tension is not
enough.
o Correct the needle-toJooper relation (See 1 5).
o Correct the shape of the looper blade using
an oilstone, or replace it.
o Use a Z-twist (or right-hand twist) thread with
the needle.
o Adjust the t\read tension (See l0).
o Correct the position of the chain looper threac
c a m ( S e e l 7 ) .
4. Thread breaking
( 1) Quality of the thread is poor.
(2) Thread is too thick for the needle size.
(3) Needle is installed in a wrong way.
(4) Thread tension is too high.
(5) There is a scratch or bruise on the surface
of needle, looper, throat plate or needle
suard.
o Use a thread of good quality.
o Select a suitable needle or thread.
o Install the needle correctly (See 8).
o Adjust the thread tension (See 10).
o Remove scratches and bruises using an oil-
stone or buffing machine.
5. Double chain-off
thread stitching
are not correct.
( M O - 2 4 1 6 )
( I ) Presser foot does not evenly act on the feed
d o g .
(2) Rear presser is shaking.
(3) Needle thread and looper thread tensions
are not correct.
(4) Double chain looper is installed in a wrong
wav
o Correct the relation of the presser foot with
the feed dog.(See I 6).
o Adjust the rear presser. for smooth and
steady motion.
o A d j u s t t h e t h r e a d t e n s i o n ( S e e l 0 ) .
o Correct the double chain looper (see I 5).
6. Puckering
( I ) Needle is too thick.
(2) Tiread tension is too high.
(3) Pressure applied by the presser foot is too
high or too low.
(4) Feed dog comes up too niuch from the
throat plate surface.
(5) Knife fails to cut the fabrics sharply.
(6) Differential feed mechanism is not set
correctly.
o Select a suitable needle size for the thread
and materials.
Adjust the thread tension.
Correct the presser foot pressure (See I 1).
Lower the feed dog.
Sharpen the lower knife.
Correct the differential feed mechanism
( S e e 1 3 ) .
o
o
o
o
o
Irregular stitching
( I ) Thread is not supplied smoothly
(2) Thread tension is too low.
(3) Needle is blunt.
(4) Pressure applied by the presser foot is
inadequate.
( 5) Height of the feed dog is wrong.
Use smooth thread with even thickness or
c l e a n u p t h e t h r e a d p a t h .
Increase the thread tension.
Use a new needle.
Adjust the presser foot pressure (See I l).
Adjust the height of the feed dog (See I 6)
o
o
o
2 2 . S PE C I F IC A TION S
MO-2404
MO-2414
M O - 2 4 1 6
Sewing speed (Max.) 6 5 0 0 s . p . m . 6 5 0 0 s . p . m . 6 5 0 0 s . p . m .
Stitch length
0.8 - 4 mm(1 164" - 5132") (special model : up to 5 mm)
1 . 5 - 4 m m ( 5 m m )
Needle gauge
1 . 6 , 2 . 0 , 2 . 4
m m
1 . 6 , 2 . 0 , 2 . 4 , 3 . 2 , 4 . 8 , 6 . 8 m n
Overedge width
r . 6 , 2 . 4 , 3 . 2 , 4 . O , 4 . 8 , 6 . 4 m m 2 . 0 . 3 . 2 . 4 . 0 . 4 . 8
m m 3 . 2 , 4 . 0 , 4 . 8 , 5 . 6 , 6 . 4 m m
Differential feed ratio
G a t h e r i n g s t i t c h l : 2 ( M a x . l : 4 ) S t r e t c h i n g s t i t c h l : 0 . 7 ( M a x . l : 0 . 6 )
Needle
DC x 27 (standard) (DC x I may be used)
Presser foot lift
Max. 7.0 mm\9 132") (excluding some subclass models)
Lubricating oil JUKI New Defrix Oil No. 2
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