Newlong DS-9A - Troubleshooting Common Issues; Thread Break and Stitching Problems; Component Breakage and Tape Issues

t
I
a,
!t
6, Troubleshooting
*
Plastic contents
existent
in bag material
is melt by
the heated
needle and may stick
to needle,
etc., causing
skipping
stitches.
When
closing
woven cloth bags,
kraft
paper
bags
inclusive
of
polyetlrylene
coated
layer,
polyethylene
and PVC
bags,
etc-, dampen needle
thread
with oil
to
prevent
sticking of
plastic
contents.
Use
silicone oil
processed
thread
for
packing
rice
and other food
products.
Problem
Cause
Solution
Ref.
Needle
(looper)
thread breaks
1. Damaged looper
2.
Too much thread tension
3. Too little thread tension
4. Thread snarled
or hung
up
along
path
between thread
stand
and needle,/looper
5. Incorrect threading. Thread not between
tension discs
6. incorrect needle setting
7.
Bent or
damaged
needle
8. Double sewing
9.
Decreased
stitch leneth because
ofworn feed
dog teeth
Replace
Decrease
Increase
Correct
Thread correctly
Set correctly
Replace
Move up thread
controller
Replace
feed dog
5-3
5-1
5-1
3
3
5-3-b
5-3-b
5-1
5-4-b
No
chain
formed
between
bags
1. Incorrect threading
2.
Too much looper thread tension
3.
Too little needle
thread tension
4. Thread
controller too
low
5.
Needle
and looper not
timed
each other
6. Not enough
presser
foot
pressure
7. Thread is cut by feed dog
teeth
8.
Thread is
feedback
because feed
dog is set too
high
Thread
correctly
Decrease
Increase
Move it up
AdirLtst
timine
Increase
File
the row
offeed
dog teeth
that
comes in touch with
thread
Adir,rst
heieht offeed dog
3
5-1
5-1
5-1
5-3-c
tr_o
5-4
5-4-b
Skipping stitchs
1.
Wrong setting
of needle
2. Bent or damaged
needle
3. Thrcad controller too
low
4. Wom looper
point
5. Needle
too
high
6. Thread sticking to
needle due to
heat
7.
Needle
guard pushing
needle
8.
Looper
thread too
loose to form a
good
triangle
(reverse
skip)
9.
Needle
and looperwide
apart
(scoop
skip)
Set correctly
Replace
Move it up
Replace
looper
Lower needle
bar
Dampen needle
t}read
with
oil
Adirrst
needle
Suaxd
lncrease
looper
thread
tension
Adjr,rst
distance
needle
to
looper
5-3-b
5-3-b
5-1
5-3-c
5-3-b
*
5-4-d
5-1
5-3-c
Needle
or looper
breaks
1. Bent needle
2.
Looper
point
hitting needle.
Needle
point
hitting
looper
3. Needle
guard pushingneedle
orthey
are wide apart
Replace
AdjrLrst
timing of
needle and
looper
Adj,Lrst
needle
guard
5-3-b
5-3-c
5-4-d
Stitch
length nqt
uniforrn, Curved
seam
1. Not
enough
presser
foot
pressure
2.
Worn feed dog teeth
3. Bent
needle
Increase
Replace
feed
dog
Replace
5-2
5-4-b
s-3-b
Thread
bites into
ctepe
tape
1. Two
much needle
thread tension
Decrease
5-l
Crepe tape creases
1. Feed
dog, rear, is higher
than feed
dog front
a little
Adjrust height
5-4-b
13