JUKI TSU-471 Quick start guide
1-NEEDLE, BOTTOM FEED, LONG CYLINDER BED, LOCKSTITCH MACHINE FOR
EXTRA
HEAVY-WEIGHT
MATERIALS
WITH A SEMI-ROTARY
LARGE-CAPACITY
SHU
TILE
TSH-411
1-NEEDLE, TOP & BOTTOM FEED, LONG CYLINDER BED, LOCKSTITCH MACHINE
FOR EXTRA HEAVY-WEIGHT MATERIALS WITH A SEMI-ROTARY LARGE-CAPACITY
SHU
TILE
TSU-471
ENGINEER'S MANUAL
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29338100
No.OO
From the library of: Superior Sewing Machine & Supply LLC
PREFACE
This Engineer's Manual is written for the technical personnel who are responsible for the service and maintenance
of
the sewing machine. This manual describes "Adjustment Procedure", "Results
of
Improper Adjustment", and other
functions which are not covered by the Instruction Bookintended for the maintenance personnel and sewing operators
at
a sewing factory.
All personnel engaged
in
repair
of
TSH-411 and TSU-471 are required to carefully read Section 2 "Standard Adjustment"
which contains important information on the maintenance
of
TSH-411 and TSU-471.
The "Standard Adjustment" consists
of
two parts; the former part presents illustration and simplified explanation for
the convenience
of
reconfirmation
of
the required adjustment values in carrying out actual adjustment after reading
this manual once; and the latter part provides "Results
of
ImproperAdjustment" in which sewing and/or mechanical
failures, and the correcting procedures are explained for those persons who perform such adjustment forthe first time.
It is advisable to use "TSH-411 and TSU-471 Parts Book" together with this Engineer's Manual.
CONTENTS
1. SPECIFICATIONS ......................••.•.......•.......••••...•.•.........••......••....................... 1
2. ADJUSTMENTS •...•........................•.•.••••............................................•..............2
(1) The position
of
the shuttle when
it
is recessed
most
.......••...•.........•.........••......•...•..... 2
(2) Needle-to-shuttle timing......•.•••....•...•....•..•..•......................•............................................2
(3)
Height
of
the needle bar......................................•................................................•..........2
(4)
Clearance between the needle and the shuttle............................................................. 4
(5)
Clearance between the needle and the shuttle driver.................................................. 4
(6) Height
of
the feed dog•...•••.•••..•..........••......•.•...................................................•.............. 6
(7)
Longitudinal position
of
the feed dog ......•.................................................................... 8
(8)
Feed
timing
..................................................•....................................................................8
(9)
Movement
of
the walking
foot
(This item
is
applied only
to
the
TSU-471.) .............
10
1) Longitudinal position
of
the walking foot................................................................................................. 10
2) The amount
of
alternating vertical movement
of
the walking foot and the presserfoot ......................... 10
3) Operating height
of
the walking foot and the presser foot ...................................................................... 12
4) Feed amount
of
the walking foot ............................................................................................................ 12
5) Top feed timing ....................................................................................................................................... 14
3. PARTS WHERE ANAEROBIC ADHESIVE (LOCK-TITE) IS USED .............. 16
4. SELECTIVE CONNECTED PARTS LIST ....................................................... 17
5.
CONSUMABLE PARTS LIST •.•••..•...........................................••..••••••••.•........ 17
6. OPTIONAL PARTS .......••.•••••••••..••.......•.•••.••......•••...••.•.....•••••.••••••......•..........• 17
7. PROBLEMS WITH SEWING AND CORRECTIVE MEASURES .................... 18
8. DRAWING OF THE TABLE .....•.••.•......................................................•.••••..... 19
From the library of: Superior Sewing Machine & Supply LLC
1. SPECIFICATIONS
No. Item Specifications
1 Model TSH-411 TSU-471
2 Name
of
machine 1-needle, bottom feed, long cylinder 1-needle, top and bottom feed, long
bed,
lockstitch
machine
for
extra
cylinder bed, lockstitch machine for
heavy-weight materials with a semi- extra heavy-weight materials with a
rotary large-capacity shuttle semi-rotary large-capacity shuttle
3 Application Tents, bags, shoes, bag handles, safety belts, etc.
4 Sewing speed Max. 800 rpm
5 Needle
SCHMETZ794
6 Range
of
needle size Nm =130
to
Nm =280
7 Range
of
count
of
thread #00 to #8
8 Stitch length Max.
11
mm
{normal/reverse feed)
9 Lift
of
presser foot 12
mm
by hand
lifter/20
mm
by
pedal
10 Stitch adjusting method Lever
nut
type (feed connecting link fulcrum moving method)
11
Reverse feed stitching method By lever
12
Thread take-up lever Cam type thread take-up lever
13 Needle bar stroke
56mm
14 Alternate foot stroke 4
mm
to 8 mm (TSU-471 only)
15 Shuttle Semi-rotary large-capacity shuttle
16 Feed mechanism Rocking method
of
feed connecting link by feed eccentric cam
17 Top feed mechanism Bottom feed interlocking method
18 Shuttle driving shaft drive method Driving method
of
oscillating rock shaft by connecting rod eccentric cam
19 Lubrication Manual
20 Lubricating oil
New
Defrix Oil No. 1
21
Bobbin winder Built-in type
22 Free space forsewing 180 mm x 420 mm
23 Bed size 253 mm x 656 mm
24 Motor 4P, 400W clutch motor
25 Belt M type V-belt
-1-
From the library of: Superior Sewing Machine & Supply LLC
Standard Adjustment
2. ADJUSTMENTS
(1)
The position
of
the shuttle when
it
is recessed most
(2)
Needle-to-shuttle timing
Needle
Condition
• When the shuttleturns counterclockwise
until
it
will
go
no
further,
the
shuttle
should come in contactwith point A.
/ SCHMETZ 794-Nm 230
Blade point
of
shuttle
\
Lowest position
of
needle bar
Condition
• Whenthe blade point
of
the shuttle is aligned
with the center
of
the needleon conditionthat
the shuttle
is
counterclockwise pressed
to
the
shuttle
driver
while
the
needle
bar
is
rising from its lowest position.
(3)
Height
of
the needle bar
_j'"--"-A
f
Smm
[Reference value
of
the lowest position
of
the needle bar stroke]
Distance A from the uppersurface
of
the throatplate
to
the lower
end
of
the needle
bar
TSH-411 : 26.9
mm
TSU-471 : 26.4
mm
Distance from the top end
of
the needle eyelet
to
the blade
point
of
the shuttle
---~~
{ TSH-411
:2
mm
TSU-471 : 2.5
mm
Condition
• When the blade point
of
the shuttle
is
aligned with the
center
of
the needle
on
condition
that
the
shuttle
is
counterclockwise pressed
to
the shuttledriverwhilethe
needle
bar
is rising from its lowest position.
-2-
From the library of: Superior Sewing Machine & Supply LLC
Adjustment Procedures
1. Tum and stop the handwheel atthe position where the shuttle
turns counterclockwise until it will go no further.
2.
Loosen the shuttle driving shaft crank screw.
3.
Turn the shuttle
by
hnd to adjust the position
of
the blade
point
of
the shuttle. Then, fix the shuttle.
..
..
.
.
::
::
r~!
\.
::
!~·-·
l
~~~~iving
shaft crank screw
1. Loosen two setscrews (B) in the connecting rod eccentric
cam and setscrew (A)
in
the connecting rod eccentric cam.
2. Turn the connecting rod eccentric cam to adjust the lifting
amount
of
the needle barand tighten setscrew (A). (Reference
value) Align the marker dot engraved on the connecting rod
eccentriccam with the markerline engraved on the main shaft.
3.
Turn the handwheel toward you, and check the lifting amount
ofthe needle bar. Then, securely tighten two setscrews (B).
(Caution) Tighten
the
screws with
the
tightening torque
of
180
to
200 kgfcm.
Setscrew (A) in connecting rod
eccentric cam
Connecting rod eccentric cam
~
Engraved marker
dot
Setscrews (B) in connecting .
rod eccentric cam Marker hne
engrave~
on main shaft
~~~0
0
1. Turn and stop the handwheel at the position where the blade
point
of
the shuttle is aligned with the center
of
the needle
while the needle bar is rising from its lowest position.
2.
Loosen two setscrews
in
the needle barconnection.
3.
Move the needle barup and down to adjustthe height. Then,
fix it.
Setscrew in needle bar
connection
-3-
Results
of
ImproperAdjustment
0 Stitch skipping
or
thread breakage
will occur.
0 Stitch skipping orthread breakage
will occur.
0 Stitch skipping
or
thread breakage
will occur.
From the library of: Superior Sewing Machine & Supply LLC
Standard Adjustment
(4)
Clearance between the needle and the shuttle
I.
0.25
to
0.35 mm
Condition
• When the blade point
ofthe
shuttle isaligned with the center
of
the needle while the needle bar is rising from its lowest
position.
(Position as shown in the illustraion
of
item (3) on page 2)
(5)
Clearance between the needle and the shuttle driver
Shuttle driver
0 to 0.05
mm
Condition
• When the convex section
of
the needle is aligned
with the needle guard section
of
the shuttledriver.
-4-
From the library of: Superior Sewing Machine & Supply LLC
Adjustment Procedures
Adjust the clearance between the needle and the shuttle by
replacing the shuttle race back. The shuttle race back comes
in
six different thickness
in
addition to the standard thickness.
To replace the shuttle race
back:
1.
Remove two setscrews
in
the shuttle race, remove the shuttle
race, and remove the shuttle.
2.
Turn the handwheel until the shuttle driver is brought to the
position where the shuttle race back comes off as shown
in
the illustration. Then, replace the shuttle race back.
Shuttle driver
Setscrews In shuttle race
1. Loosen two setscrews, and remove the thrust collar
of
the
feed bar driving shaft.
2.
Loosen two setscrews, and move the thrust collar
of
the feed
rocker shaft.
3.
Loosen two setscrews in the shuttle driving shaft thrust collar,
setscrew in the shuttle driving shaft front bushing and screw
in
the shuttle driving shaft crank.
4. Adjust the clearance by moving the shuttle driving shaft front
bushing to the left and right.
5.
Afterthe adjustment has been completed, fix the shuttle driving
shaft thrust collar, making sure that there is no axial play
of
the shuttle driving shaft. Then, fix the shuttle driving shaft
crank.
6.
Finally, secure the respective thrust collars, making sure that
there is no play in the feed rocker shaft and the feed bar
driving shaft.
Thrust collar
of
feed
rocker shaft
Setscrew /
Setscrew
In
shuttle
Thrustcollar
of
feed driving shaft crank
bar
driving shaft
Shuttle driving shaft Setscrew in shuttle driving shaftthrustcollar
front
bushing Setscrew In shuttle driving
shaft
front
bushing
-5-
Results
of
ImproperAdjustment
0 Ifthe clearance is excessivelysmall,
needle and hook will interfere with
each other. As a result, damage
of
the both will result.
0 Ifthe clearance is excessively large,
stitch skipping
or
thread breakage
will result.
0 Ifthe clearance is excessively small
and shuttle driver presses needle,
stitch skipping or thread breakage
will result.
0 Ifthe clearance is excessively large,
needle and hook will interfere with
each other. As a result, damage
of
the both will result.
From the library of: Superior Sewing Machine & Supply LLC
Standard Adjustment
[The standard
for
adjusting the clearance between the needle and the blade
point
of
the shuttle]
Needle
SCHMETZ794
Clearance :
"0"
(6) Height
of
the feed dog
<%)
®
Conditions
• Maximum stitch length feed
(11
mm)
• Needle bar
at
its
upperdead point
-6-
Minimum
clearance
From the library of: Superior Sewing Machine & Supply LLC
Adjustment Procedures
Use a standard SCHMETZ 794-Nm230 needle.
CD
Turn and stop the handwheel atthe position where theconvex
section
of
needle is aligned with the needle guard section
of
shuttle driver, and adjust the clearance between them to "0".
@ Tum and stop the handwheel at the position where the blade
point
of
shuttle is aligned with the center
of
needle while the
needle bar is going up from its lowest position, and press the
needle against the needle guard section
of
shuttle driver.
®
In
the state
of@,
adjust the clearance to a minimum, making
sure that the needle does not come in contact with the blade
point
of
shuttle.
* By this adjustment, the clearance between the needle and
the blade point
of
the shuttle will be 0.25 to 0.35 mm.
1.
Remove two setscrews in the shuttle race to remove the
shuttle race, and remove the shuttle.
2.
Turn the handwheel to move the shuttle driver to the position
where the setscrew in the feed dog can be observed.
3.
Loosen the setscrew
in
the feed dog, and adjust the height
of
the feed dog by moving the feed dog
up
ordown.
4. After the adjustment, firmly tighten the setscrew in the feed
dog.
Setscrew in
shuttle race
Setscrew in
feed dog Feed dog
-7-
Results
of
ImproperAdjustment
0 When the height is high, the feed
dog comes
in
contact with the throat
plate. In addition, damage
of
the
sewing product will result.
0 When the height is low, the feed dog
comes in contact with the shuttle
race and the shuttle race back. In
addition,
the
feed
force
will
be
deteriorated.
From the library of: Superior Sewing Machine & Supply LLC
Standard Adjustment
(7)
Longitudinal position
of
the feed dog
Condition
• Maximum stitch length
(11
mm)
0 0 0
(8) Feed
timing
Feed eccentriccam
VNeedle
I
~
1)1JI11J
~'
Feed dog
Feeding motion starts at the same time when the needle
bar
starts
descending from Its highest dead point.
-8-
From the library of: Superior Sewing Machine & Supply LLC
Adjustment
Procedures
1. Maximize the stitch length
(11
mm).
2.
Loosen two setscrews
in
the feed rock shaft crank.
3.
Move the feed dog to the right and left to adjust so that the
longitudinal clearance between the window hole
of
the throat
plate and the feed dog is equal when the feed dog moves,
and fix the feed dog.
Setscrews in feed
rock shaftcrank
0
Feed dog
1.
Loosen two setscrews in the feed eccentric cam.
2.
Turn the feed eccentric cam to adjust the timing and fix the
cam.
(Standard)
Align the marker line engraved on the side plate
of
the feed
eccentric cam with the markerline engraved
on
the main shaft
to obtain the standard timing.
Marker line engraved
on main shaft
Marker line engraved on side plate
of
feed eccentric cam
-9-
Results
of
Improper
Adjustment
0 The feed dog comes in contact with
the throat plate and contact noise
will occur.
0
Stitch
length
in
terms
of
the
. graduations on the feed lever will
change.
In addition, stitch length
of
normal
and
reverse
feed
stitches
will
change.
0 Irregular stitches will occur.
From the library of: Superior Sewing Machine & Supply LLC
Standard Adjustment
(9) Movement
of
the
walking
foot
(This item
is
applied
only
to
the
TSU-471.)
1)
Longitudinal position
of
the walking
foot
0
2mm
Conditions
• Maximum stitch length
(11
mm)
• When walking
foot
is
most
close
to
presserfoot.
2)
The amount
of
alternating vertical movement
of
the walking
foot
and the presser
foot
-10-
Amount
of
alternating
vertical movement
From the library of: Superior Sewing Machine & Supply LLC
Adjustment
Procedures
1.
Maximize the stitch length
(11
mm).
2.
Lower the presserfoot
on
the throat plate, turn and stop the
handwheel atthe position where the walking footis mostclose
to the presser foot.
3.
Loosen the screw in the center shaft rear arm.
4.
Move the walking foot to adjust the clearance and fix it.
Screw in center
shaft rear ann
1.
Bring the needle barto the lowest position
of
its stroke. Then,
lower the presser foot.
2.
Loosen the screw in the walking foot arm (front).
3.
Move the walking foot arm (front) :
• In the direction
of
(A) and fix
it-+
arrountofrrovementofthe
presser foot
is
decreased.
• In the direction
of
(B) and fix
it-+
arrountofrrovementofthe
presser foot is
increased.
Screw in walking
foot
ann (front)
Walking
foot
arm
(front)
-11-
Results
of
Improper
Adjustment
0
If
the clearance is smaller than the
specified value, the walking foot
comes in contact with the presser
foot and contact noise will occur.
0 If the clearance is larger than the
specified
value,
stitch
length in
terms
of
the graduations
on
the feed
lever will change.
0 It is effective when the amount
of
movement
of
the walking foot is
slightly increased according to the
sewing product.
(Sponge, excessive heightdifference
at stepped section, etc.)
0 When
the
amount
of
alternating
vertical movement
of
the walking
foot and that
of
the presserfoot are
excessively
different
from
each
other, stitch length in terms
of
the
graduations on the feed lever will
change.
From the library of: Superior Sewing Machine & Supply LLC
Standard Adjustment
3)
Operating height
of
the walking
foot
and the presser
foot
Operating height
Standard
• Fix the walking
foot
rod to the top
of
the
slot
in the walking
foot
arm (rear).
4)
Feed amount
of
the walking foot
Top feed
Bottom feed
Feed amount
Standard
• Bottom feed amount versus top feed amount is 1 : 1.
-12-
From the library of: Superior Sewing Machine & Supply LLC
Adjustment
Procedures
1.
Loosen the hinge screw
in
the walking foot rod.
2.
Fix the walking foot
rod
:
• to the bottom (A)
of
the slot
in
the walking foot arm (rear}
-4
operating height is maximized
(8
mm).
• to the top (B)
of
the slot
in
the walking foot arm (rear)
-4
operating height is minimized
(4
mm).
Walking
foot
arm (rear)
Hinge screw in walking
foot
rod
1.
Raise the hand lifter lever.
2.
Loosen the top feed adjusting lever.
3.
Tum the top feed adjustment screw:
-1. Tum clockwise
-4
top feed amount
is
decreased.
-2. Tum counterclockwise
-4
top feed amount is increased.
© Align the outer diameter of the top feed adjusting roller
shaft
with the marker
dot
engraved on the top feed
adjusting base
-4
bottom feed amount versus top feed
amount is 1 :
1.
4.
After the adjustment, tighten the top feed adjusting lever to
fix.
Top feed adjustment
Top feed adjusting
roller shaft
Marker
dot
engraved on
top
feed adjusting base
Top feed adjusting lever
-13-
Results
of
Improper
Adjustment
0 It is effective when the operating
height
is
increased according to the
sewing product.
(Sponge,
excessive
height
difference at stepped section, etc.)
0
When
the
operating
height
is
excessively high, stitch length in
terms ofthegraduations
on
the
feed
lever will change.
3-1
When the top feed adjusting roller
shaft is at the top position :
Upperfabric
is
fed less and
bent in the direction
of
the
arrow.
u
Slippage
3-2 When the top feed adjusting roller
shaft is at the bottom position :
Upperfabric is fed more and
bent in the direction
of
the
arrow.
Slippage
r1
From the library of: Superior Sewing Machine & Supply LLC
Standard
Adjustment
5)
Top feed timing
Needle
Top surface
of
throat plate
--------------~----+-~-----------
Tip
of
needle
is
aligned with the top surface
of
throat plate when the needle as well as the
presser
foot
come down.
At
the same time, the preser
foot
is
aligned with the
top
surface
of
throat plate.
-14-
From the library of: Superior Sewing Machine & Supply LLC
Adjustment
Procedures
1.
Loosen two setscrews
in
the top feed
cam.
2.
Tum the top
feed
cam
to
adjust the timing and fix
it.
(Standard)
Adjust so that setscrew
No.2
faces exactly sideways when
the needle bar is in the upper dead point
of
its stroke.
Top feed cam
Setscrew No. 2
-15-
Results
of
Improper
Adjustment
When
the
timing
is
excessively
advanced:
0 Thread tightening is
deteriorated.
0 Stitch length in terms
ofthe graduations
on
the
feed
lever
will
change. (Stitch length
is decreased.)
0 Reverse feed motion
is
applied
to
the
walking foot.
When
the
timing
is
excessively
retarded:
0 Thread tightening is
deteriorated.
0 Stitch length
in
terms
ofthe graduations
on
the
feed
lever
will
change. (Stitch length
is increased.)
From the library of: Superior Sewing Machine & Supply LLC
3. PARTS WHERE ANAEROBIC ADHESIVE (LOCK-TITE) IS USED
Needle bar crank
Needle bar shaftnut
crank shaft
~
~-~It
LOCK-TITE
use.~
~
Needle bar
crank seat(B)
~Roller
follower
Roller
guide~
•
~:CK-TI~
~_1-J
Tn~ngle
lever used Presser bar
hange
screw guide bracket
{TSU-471
only)
Hand lifter cam
thrust
collar Top feed rod hinge screw
Rod
LOCK·TITE
~
-Hinge screw
---·~
used
LO~K-TIT
~
•
used
Hand lifter lever R d
h.
o mge screw
{TSU-471
only)
J;l~~sed
{TSU-471
only) LOCK·TITE used
Driving shaft Feed eccentric cam
sid~e
plate etscrew
LOCK·TITE
~
used
~~
OCK·TITE
Feed used
LOCK·TITE
~
used
Hook
cover
,
i
Hook cover
setscrew
LOCK-TITE used
-~
eccentric
cam
Feed connecting
Feed rock
shaft
crank rod hinge screw
{TSH-411
only)
Feed regulator
Lifting link
;~a~:ecting
S:type metal fitting
k hongescrew
0
0
5
.:.~---i
metal ) I
fitting LOCK-TITE used
Hook driving
shaftcrank
k.Siide
block stud
~-~
~-
LOCK-TITE used
Roller shaft
nut
Parts shown in the illustration above are fixed by LOCK-TITE.
LOCK-TITE
0~
Feed7
connecting
link
hinge
screwB
When
these
parts are disassembled, be sure
to
wash
the
LOCK·TITE
used
connected section using a paint thinner, remove any moisture 1
from the mating faces, and re-assemble it using LOCK-TIT
E.
Ifit is hard to remove a screwwhich has been fixed using LOCK-
TITE, heat it using a torch lamp to help remove the screw.
~~:~i~~e
..
(Caution)
It
is advisable
not
to
disassemble these parts
if
screw
possible.
-16-
LOCK-TITE
used
~-
Top feed
link
B hinge screw
{TSU-471
only)
Top feed link B
LOCK·TITE
used
ar?-·
Triangle lever
hinge screw
{TSU-471
only)
Feed connecting link
·~lnge
screw A nut
From the library of: Superior Sewing Machine & Supply LLC
4. SELECTIVE CONNECTED PARTS LIST
Part
No.
Name
ofpart Remarks
10519502 Thread take-up lever roller Standard (Outer diameter
11.1
~.ooamm
)
21046107 Thread take-up lever roller (Outer diameter
11.1
~:~~
mm
)
21046206 Thread take-up lever roller (Outer diameter
11.1:g:~mm)
21155007 Shuttle
race
back
(1)
(Thickness 2.9
_g.o3mm
)
21155106 Shuttle
race
back
(2)
(Thickness
3.1
_g.o3mm
)
21155205 Shuttle
race
back
(3)
(Thickness
3.3
_g.o3mm
)
21155304 Shuttle
race
back (4) Standard (Thickness
3.5.g.o3mm
)
21155403 Shuttle
race
back (5) (Thickness
3.7
~.o3mm
)
21155502 Shuttle
race
back (6) (Thickness
3.9
~.o3mm
)
21155601
Shuttle
race
back (7) (Thickness
4.1
!.o3mm
)
5. CONSUMABLE PARTS LIST
Part
No.
Name ofpart Remarks
MC532002300 Needle (794Nm =
230)
21041850 Shuttle (asm.)
21057401
Bobbin
21059605 Thread take-up spring A
21059704 Thread take-up spring B
6. OPTIONAL PARTS
Part
No.
Name ofpart Remarks
21064605 Detector support
arm
NS6150430SSP Detector support
arm
nut
GAK720000AO
Air-type auto-lifter AK-72A
Knee
switch type
GAK720000BO
Air-type auto-lifter AK-728 Pedal kick-back type
21150404 Throat plate (short)
21170303
Feed
dog
(herringbone) ForTSH-411
21166103 Presser bar connecting foot For
TSH-411
21166202 Presser bar for connecting foot For
TSH-411
SS8660512TP Presser bar connecting foot screw For
TSH-411
21164058 Eye guard kit
-17-
From the library of: Superior Sewing Machine & Supply LLC
7. PROBLEMS WITH SEWING AND CORRECTIVE MEASURES
Problem
1.
Thread often breaks, thread splits
finely,
or
correct stitch
cannot
be
formed (half-finished stitch).
2. Stitches are offten skipped.
Cause
G)
Flaw is found out at thread path, needle point,
shuttle blade point,
or
needle
eyelet
@ Improperfinish around the recess in the needle
@ Excessively tightened needle thread tension
® The needle interferes with the blade point
of
the
shuttle.
® The timing
of
the needle and the shuttle is too
early or too slow.
@ Due to heat generated by the needle
0 Excessive height difference
at
stepped section
(J)
The needle-to-shuttle blade point clearance is
excessive.
@ The timing
of
the needle and the shuttle is too
early or too slow.
@ The presser foot pressure is insufficient.
Corrective measures
0 Remove flaw by smoothing flaw with fine paper
file.
0 Replace the needle with a new one.
0 Adjust the needle thread tension.
0 Referto "(4) Clearance between the needle and
the shuttle" on page 4.
0 Refer to "(2) Needle-to-shuttle timing • on page
2.
0 Decrease the sewing speed
of
the machine. Use
silicone oil.
0 Increase the amount
of
movement
of
the thread
take-up spring.
0 Referto "(4) Clearance between the needle and
the shuttle" on page 4.
0 Refer to ·(2)Needle-to-shuttle timing· on page
2.
0 Tighten the presser adjusterscrew.
® The distance from the upperend
of
the needle 0 Refer to "(3) Height
of
the needle bar" on page
eyelet
to the blade point
of
the
shuttle
is
not
2.
proper.
® The needle is improperly selected. 0 Replace the needle with a
one-count
thicker
needle.
@ The amount
of
movement
of
the thread take-up 0 Decrease the amount of movement
of
the thread
spring is excessive. take-up spring.
0 Overheated needle
or
shuttle,
or
thread is not 0 Use silicone oil.
pulled smoothly.
® Reverse feed stitching is made at low speed on 0 Wind the needle thread around the needle.
light-weight material using nylon thread.
3. Improper thread tension, irregular
G)
The thread path
in
the
needle hole
of
the presser 0 Smooth the surface with a fine paper file
or
using
stitch, or excessive bobbin thread foot, in the needle hole
of
the
feed dog,
or
of
a buff.
tension thread guides is poorly finished.
@ The bobbin slides unsmoothly. 0 Replace the bobbin
or
the shuttle.
@ Weak bobbin thread tension 0 Adjust the bobbin thread tension.
® Bobbin thread is wound too tightly. 0
Decrease
the
tension
of
the
bobbin
thread
winder.
® Needle thread flaps. (Needle thread flaps and 0 Thread thetension guide baras illustrated below.
comes
out
of
the thread
tension
disk
due
to
excessive needle thread tension.)
(Needle thread flaps too much and is caught in
other parts.) To the needle
thread tensioner
@Too
thin bobbin thread is used to combine with 0 Use silicone oil.
needle thread.
4. Poor gloss
of
the needle thread 0 Excessive height difference
at
stepped section 0 Use silicone oil.
5.
lnconsisyently
finished
seam
0 Needle is too thick. 0 Replace the needle with a thinner one.
(stitches are
not
made straight but Use the cutting point needle.
~
made such
as"~".)
6.
Bobbin
thread tension
cannot
be 0 The bobbin thread tension spring
of
the shuttle 0 Clean by removing
the
bobbin thread tension
increased. has become dusty
or
dirty. spring.
7.
The beltslips.
CD
The V belt is degraded. 0 When degradation isfound outto the Vbelt, such
(Motor
stoppage
occurs,
if
an
as wear, cracking, etc., replace with a new one.
electronic-stop motor is used.) @ The V belt tension is not enough. 0 Adjustthe slack amountin the V beltto 10mm/1
kg
f.
I
_J....._
I
Handwheel
•,
Motorpulley
-
1-
-18-
From the library of: Superior Sewing Machine & Supply LLC
This manual suits for next models
1
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