Tr�U�Les In Sewing And C�Rrective Measures - JUKI DLN-6390 Manuel D'utilisation

*. TR�U�LES IN SEWING AND C�RRECTIVE MEASURES
Causes of troubles n sewng and correctve measures
Troubles Causes (Items to be checked)
Sttch skppng Check whether clearance between needle
at overlapped and blade pont of hook s proper.
secton
Check whether knd or sze of needle s proper.
Check whether blade pont of hook has a
scratch or s blunt.
Check whether relaton of poston between
needle and needle hole s proper.
Check whether tenson of thread take-up
sprng s too hgh.
Check whether stroke of thread take-up s too
small.
Check whether thread tenson s too tght.
Check whether needle cooler ar pressure s
too hgh.
Check whether poston of hemmng bnder s
proper.
Check whether cloth s properly rolled.
Check whether needle s bent or needle tp s
blunt.
Check whether needle attachng s proper.
(Direction, insufficient insertion, etc.)
Check whether threadng s not wrong.
Thread breakage Refer to tem "Sttch skppng at overlapped
at overlapped secton".
secton
Loadng at Check whether cloth s properly rolled.
overlapped
secton
Check whether nstallng poston of needle
cooler ar ppe s proper.
Check whether pressure of presser foot (asm).
s too hgh.
Corrective measures
Make the clearance between needle and blade pont
of hook come near to "0" when thread s caught.
Replace the needle wth a proper one.
SCHMETZ UY80GVS s recommended.
(Sewng performance s stablzed when usng a
thck one f possble.)
Remove the scratch or replace the hook wth a new
one.
Adjust the poston of throat plate and presser foot
(asm.) to a proper one.
(The proper poston of needle n terms of needle
hole n the throat plate s n the center of both sdes
and that n terms of needle hole n the presser foot
(asm.) s slghtly to the rght sde.)
Adjust the tenson to a proper one.
(0.2 N s recommended.)
Adjust the poston of thread take-up thread gude to
a proper one.
(The poston of engraved marker lne s the
standard. Movng t to the left ncreases the stroke
of thread take-up.)
Decrease the thread tenson.
Set the ar pressure to a proper one (t s better to
set t to rather low).
Adjust the poston to a proper one. (Sttch skppng s apt
to occur when needle perces almost the edge of fold.)
Adjust by handlng so that hemmng of the bottom
can be properly performed.
(Feed force s not stablzed when cloth becomes
thck due to the falure of rollng.)
Replace the needle wth a new one.
Properly attach the needle.
Properly pass the thread.
Refer to tem "Sttch skppng at overlapped secton".
Adjust by handlng so that hemmng of the bottom
can be properly performed.
(Feed force s not stablzed when cloth becomes
thck due to the falure of rollng.)
Adjust the poston to a proper one.
(If the poston s mproper, the ar ppe nterferes
wth the presser foot (asm.) and may hnder the lft
of the presser foot (asm.).)
Properly adjust the presser foot (asm.) pressure.
(If the presser sprng regulator s excessvely
tghtened, the lftng amount of the presser foot
(asm.) decreases.)
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