JUKI LU-1520NCS-7 User manual

LU-1520NCS-7
INSTRUCTION MANUAL

i
CONTENTS
BEFORE OPERATION ........................................................................................................1
SPECIFICATIONS................................................................................................................1
1. INSTALLATION..............................................................................................................2
2. ADJUSTING THE BELT TENSION................................................................................3
3. ADJUSTING THE STOP POSITION..............................................................................3
4. ATTACHING THE BELT COVER...................................................................................4
5. THE AIR DRIVE UNIT OF THE SEWING MACHINE EQUIPPED WITH AUTOMATIC
REVERSE FEED DEVICE AND AUTO-LIFTER............................................................4
6. INSTALLING THE THREAD STAND.............................................................................7
7. LUBRICATION ...............................................................................................................8
8. ATTACHING THE NEEDLE .........................................................................................10
9. ATTACHING AND REMOVING THE BOBBIN ............................................................ 11
10. THREADING THE HOOK ............................................................................................11
11. INSTALLING THE BOBBIN WINDER THREAD GUIDE ............................................. 11
12. WINDING A BOBBIN ...................................................................................................12
13. THREADING THE MACHINE HEAD...........................................................................13
14. ADJUSTING THE STITCH LENGTH...........................................................................14
15. THREAD TENSION......................................................................................................15
16. THREAD TAKE-UP SPRING .......................................................................................15
17. HAND LIFTER..............................................................................................................15
18. ADJUSTING THE PRESSURE OF THE PRESSER FOOT ........................................16
19. NEEDLE-TO-HOOK RELATION..................................................................................16
20. ADJUSTING THE HOOK NEEDLE GUARD ...............................................................17
21. ADJUSTING THE BOBBIN CASE OPENING LEVER................................................17
22. ADJUSTING THE POSITION OF COUNTER KNIFE AND MOVING KNIFE..............18
23. ADJUSTING THE KNIFE PRESSURE ........................................................................19
24. ADJUSTING THE POSITION OF BOBBIN THREAD CLAMP....................................19
25. ADJUSTING THE CLAMP PRESSURE ......................................................................20
26. ADJUSTING THE LIFTING AMOUNT OF THE PRESSER FOOT AND THE
WALKING FOOT..........................................................................................................20
27. SEWING SPEED TABLE .............................................................................................20
28. RESETTING THE SAFETY CLUTCH..........................................................................20
29. ADJUSTING THE AUTOMATIC PRESSER FOOT LIFTER........................................21
30. Needle thread clamp device (option)........................................................................21
31. CAUTIONS WITH REGARD TO THE SEWING OPERATION ....................................21
32. ADJUSTING AND CHECKING THE STOP POSITION OF SEWING MACHINE........22
33. TROUBLES IN SEWING AND CORRECTIVE MEASURES.......................................23

– 1 –
• Beforeyouputthemachineintooperationforthersttimeaftertheset-up,cleanitthoroughly.
Removealldustgatheringduringtransportationandoilitwell.
• Conrmthatvoltagehasbeencorrectlyset.
Conrmthatthepowerplughasbeenproperlyconnectedtothepowersupply.
• Neverusethemachineinthestatewherethevoltagetypeisdifferentfromthedesignatedone.
• Thedirectionofnormalrotationofthemachineiscounterclockwiseasobservedfromthepulleyside.
Takecarenottoallowthemachinetorotateinthereversedirection.
• Whentiltingthemachinehead,tiltitafterremovingkneelifterhook.
• Neveroperatethemachineunlessthemachineheadandtheoiltankhavebeenlledwithoil.
• Foratestrun,removethebobbinandtheneedlethread.
• Fortherstmonth,decreasethesewingspeedandrunthesewingmachineataspeedof80%or
lessofthemaximumsewingspeed.Astothemaximumsewingspeed,referto"27. SEWING SPEED
TABLE" p. 20.
• Operatethehandwheelafterthemachinehastotallystopped.
BEFORE OPERATION
SPECIFICATIONS
CAUTION :
Checkthefollowingsoastopreventmaloperationofanddamagetothemachine.
Sewing speed Max. 2,000 sti/min (Refer to "27. SEWING SPEED TABLE" p. 20.)
Stitch length (max.) Normal feed : 7 mm, Reverse feed : 7 mm
Needle GROZ-BECKERT 135×17 (Nm 120 to Nm 160) (Standard : Nm 120)
Thread #30 to #5 (US : #46 to #138, Europe : 20/3 to 60/3)
Hook Vertical-axis 2.0-fold capacity hook
Lift of presser foot Hand lifter lever : 9 mm, Auto-lifter : 16 mm
Lubricating oil JUKI New Defrix Oil No. 2
Noise
-Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 80.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821-
C.6.2 - ISO 11204 GR2 at 900 sti/min.
Machine head weight 48 kg

– 2 –
Align
❹
7 mm
Operator’sside Table
4) Attaching the oil pan
Fix the oil pan ❹supplied with the machine by
tightening eight wood screws.
7) Fit hinge 󱢶into the opening in the machine bed,
and t the machine head to table rubber hinge
before placing the machine head on rubber seats
on the four corners.
5) Attach drain plug ❺, oil seal ❻and washer ❼to
the oil pan ❹. Attach packing ❾and washer 󱢵
to screw ❽ and x them with nut 󱢳.
6) After they are xed, screw in waste oil container
󱢴into drain plug ❺.
󱢶
1) Carry the sewing machine with two persons.
(Caution)Donotholdthehandwheel.
2) Do not put protruding articles such as the screw-
driver and the like at the location where the sew-
ing machine is placed.
3) Attaching the hinge seats and the support rub-
bers of the machine head
Fix the hinge seats ❶and the support rubbers ❷
supplied with the machine on the table using nails
❸.
1. INSTALLATION
❺
❻
❾
❽
❼
󱢳
󱢴
󱢵
❾
❹
❶
❷
❸
[Hingeattachinghole]
Standard
TableforLU-2210type

– 3 –
8) Securely attach head support rod 󱢷to the table
until it goes no further.
󱢷
15 mm
9.8 N
Handwheel
Motor pulley
2. ADJUSTING THE BELT TENSION
Adjust the belt tension with the height of the motor
so that the belt sags 15 mm when the center of V
belt is applied with a 9.8 N load.
3. ADJUSTING THE STOP POSITION
1) The respective stop positions and adjusting po-
sitions are those when marker dot ❶engraved
on the machine arm aligns with marker dot ❷
engraved on the handwheel. For the marker dots
engraved on the handwheel, refer to the table of
marker dot on the handwheel.
2) In case of adjusting the UP stop position, adjust
it with screw ❸, and in case of adjusting the
DOWN stop position, adjust it with screw ❹.
Refer to "32. ADJUSTING AND CHECKING THE
STOP POSITION OF SEWING MACHINE" p. 22
for how to check and adjust the stop position after
the completion of setup of the sewing machine.
❶
❷
❹
❸
WARNING :
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthe
followingworkafterturningthepoweroffandascertainingthatthemotorisatrest.
WARNING :
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthe
followingworkafterturningthepoweroffandascertainingthatthemotorisatrest.
Marker dot on handwheel
Center, White-White UP stop position
Yellow DOWN stop position
Red For adjusting thread trim-
ming cam

– 4 –
4. ATTACHING THE BELT COVER
2.5 mm
10 mm
❾󱢳
1) Attach belt cover stud ❼to the screw hole in the arm.
2) Fix belt cover (right) ❶on the arm with screws ❷and ❽.
3) Fit belt cover (left) ❸to notch Aand Bof the belt cover (right) ❶.
4) Fix belt cover (left) ❸with screws ❹, ❺and ❻.
5) Fix belt cover auxiliary plate ❾at the position of 10 mm from the rear end with wood screws 󱢳when
there is a clearance of 2.5 mm between the belt cover and the auxiliary plate ❾.
6) When tilting the machine head, loosen wood screws 󱢳and move the belt cover auxiliary plate ❾in the
direction of the arrow until it stops. Then, tilt the machine head.
(Caution)Afterattachingthebeltcover,conrmwhetherornottherespectivecordsdonotcomeincon-
tactwiththebeltandthehandwheel.
Disconnectionofthecordswillresultwhentheycomeincontactwithoneanother.
❷
❺
❹
❸
❼
❽
❻
❶
B
A
5. THE AIR DRIVE UNIT OF THE SEWING MACHINE EQUIPPED WITH AUTOMATIC
REVERSE FEED DEVICE AND AUTO-LIFTER
(1) Attaching the air control unit
1) Attach regulator (asm.) ❶to the underside of
the table with wood screws ❷supplied with the
regulator.
2) Attach solenoid valve (asm.) ❸to the four places
on the underside of the table with wood screws
❹supplied with the unit.
❶
❷
❸
❹
WARNING :
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthe
followingworkafterturningthepoweroffandascertainingthatthemotorisatrest.
WARNING :
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthe
followingworkafterturningthepoweroffandascertainingthatthemotorisatrest.

– 5 –
3) Adjust the number of the air hose to the number
of the air cylinder joint and insert the hose to the
joint.
Solenoid valve Cylinder
BT A ①
AK C ②
AK D ③
Condensed stitches B ⑤
–E–
–F–
(Caution)Donotrunthesewingmachinewhile
thepresserfootisheldraisedwiththe
auto-lifter.Needlebarcomesincontact
withpresserfoot.Asaresult,theymay
bedamaged.
(2) Adjusting the air pressure
1) After the completion of entire air piping, supply air
through joint ❺of regulator (asm.) ❶.
2) The operating air pressure is 0.45 to 0.5 MPa.
Adjust the air pressure using air pressure regulat-
ing knob ❻of the regulator (asm.) ❶.
(Caution)Iftheairpressureisinadequate,delay
inoperationoftherespectiveaircylin-
derscanbecaused,resultinginmaterial
slippageorfaultythreadtrimmingduring
automaticreversefeedstitching.
A
F
E
D
C
B
①
②③
⑤
(3) Install the needle thread clamp device (option) by following the steps of procedure described below.
Start installation procedure after stopping the air supply to the regulator.
After the completion of installation procedure, make sure that you have completed entire air piping before
supplying air to the regulator again.
 *Inordertooperatetheneedlethreadclampdevice,itisrequiredtochangethefunctionsettings
ontheSC-922controlbox.(Referto"30. Needle thread clamp device (option)" p. 21 and the
InstructionManualfortheSC-922forhowtochangethesetting.)
1) Air hose ❼connects regulator (asm.) ❶and so-
lenoid valve (asm.) ❸which are installed on the
undersurface of the sewing machine table. Now,
detach air hose ❼from the regulator side.
❶
❼
❸
Decrease Increase
❻
❺
❶

– 6 –
2) Install solenoid valve (asm.) ❽for the needle
thread clamp device on the back side of regulator
mounting plate ❾with screws 󱢳(two pieces)
supplied with the unit.
3) Insert air hose ❼which you have detached in
step 1) into joint 󱢴of solenoid valve (asm.) ❽.
4) Insert air hose 󱢵which is connected to joint 󱢴to
joint 󱢶of regulator (asm.) ❶.
5) Install air hose 󱢷for needle thread clamping
along the piping of touch-back switch 󱢸and con-
nect to needle thread clamp device 󱢹.
󱢷
󱢷
󱢷
󱢹
󱢸
󱢷
❾
❶
❽
󱢴
󱢵
󱢶
❼
❸
󱢳

– 7 –
6. INSTALLING THE THREAD STAND
Assemble the thread stand, set it up on the machine
table using the installation hole in the table and tight-
en nut ❶gently.
❶
6) Insert two wires (red and black wires of solenoid
valve (asm.) ❽into the 18-pin connector of sole-
noid valve (asm.) ❸. (Insert the black wire into
No. 8 and red wire into No. 17.)
1018
19
(←Redwire)
(←Blackwire)
Insertionpositionof18-pinconnector
*Theabovediagramrepresentsthemodel
withoutDLdevice.FortheDLdeviceequipped
model,acordisconnectedtoNo.3andNo.12.

– 8 –
7. LUBRICATION
(1) Lubricating procedure for the face plate
portion
1) Loosen and remove screw A.
2) Open the face plate in the direction of
arrow mark B.
3) Apply an adequate amount of oil once a
day to the points marked with the arrow
marks.
4) Close the face plate.
5) Tighten and attach screw A.
(2) For other parts
1) Apply an adequate amount of oil once a day to
the points marked with the arrow marks.
2) Before you operate your machine for the rst
time, or after an extended period of disuse, apply
an adequate amount of oil to the points marked
with the arrow marks and to each felt and oil wick
after removing top cover ❶.
(Caution)Ifoilislledmorethanrequired,oilleak-
agemayresult.
(3) Insert the projection located at the bottom of oil
tank ❷into the waste oil hole of the oil pan.
(4) Insert oil pipe ❸ into lter ❹ of the oil tank and x
the pipe with a clip.
(5) Pour the JUKI New Defrix Oil No. 2 into the oil
tank ❷until HIGH level is reached.
(6) Add the same lubricating oil up to HIGH level
as soon as the oil level has come down to LOW
level.
(7) After the lubrication, you can see from oil sight
window ❺that the oil rises up when the opera-
tion is normal. (However, the machine should run
at 1,500 sti/min or more.)
❶
❺
❸
❹
❸
❹
❷
B
A
WARNING :
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthe
followingworkafterturningthepoweroffandascertainingthatthemotorisatrest.