Juki LU2-4410_4430-B1T-CS Manual

Juki Symaskine LU2-4410_4430-B1T-CS

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A181E09 P019

LOCKSTITCH COMPOUND-FEED

AUTOMATIC UNDERTRIMMER

INDUSTRIAL SEWING MACHINES

MODEL

INSTRUCTION MANUAL

LU2-4410-B1T- CS

(Single-Needle)

LU2-4430-B1T (Double-Needle)

PRECAUTION BEFORE STARTING OPERATION

1 Safety Precautions

1 . Whenturningthepoweron,keepyourhandsandngersawayfromtheareaaround/

undertheneedleandtheareaaroundthepulley.

2 . Thepowermustbeturnedo󱐯whenthemachineisnotused,orwhentheoperator

leaveshis/herseat.

3 . Thepowermustbeturnedo󱐯beforetiltingthemachinehead,installingorremoving

the“V”belt,adjustingthemachine,orreplacingparts.

4 . Avoidplacingngers,hairs,obstacles,etc.nearthepulley,“V”belt,bobbinwinder

wheel,ormotorwhenthemachineisinoperation.Injurycouldresult.

5 . Don’tputngersintothethreadtake-uplevercover,around/undertheneedle,or

pulleywhenthemachineisinoperation.

6 . Ifthebeltcover,thengerguard,and/ortheeyeguardareinstalled,don’toperate

themachinewithoutthesesafetydevices.

2 Precaution before Starting Operation

1 . Ifthemachine’soilpanhasanoilsump,neveroperatethemachinewithoutllingoil

init.

2 . Ifthemachineislubricatedbyadropoiler,neveroperatethemachinewithout

lubricating.

3 . Whenanewsewingmachineisoperated,verifytherotationaldirectionofthepulley

withthepoweron.

 (Thepulleyshouldrotatecounterclockwisewhenviewedfromthepulley.)

4 . Verifyvoltageand(singleorthree)phaseindicatedonthenameplateofthemotor.

3 Precaution for Operating Conditions

1 . Avoidusingthemachineatabnormallyhightemperature(35℃orhigher)orlow

temperature(5℃orlower).Otherwise,machinefailuremayresult.

2 . Avoidusingthemachineindustyconditions.

3 . Avoidusingthemachineinconditionslledwithalotofelectricnoisessuchashigh-

frequencywelders.

INTRODUCTION



Thank you very much for purchasing industrial sewing machine.

Please read this instruction manual before operating the sewing machine. Please read also

“Safety Manual”, “Instruction manual for LIMISERVO” and operate the sewing machine

correctly and safely.

CONTENTS

PREPARATION FOR OPERATION ……………………………………………… 1

1Adjustmentoftheneedlestoppingposition……………………………………… 1

USAGE PRECAUTION ……………………………………………… 2

1Lubrication(1)………………………………………………………………………… 2

2Lubrication(2)………………………………………………………………………… 2

3Lubricationcondition………………………………………………………………… 3

4Adjustmentoflubricationtotherotatinghook ………………………………… 3

5Precautionforthebuilt-intypedetector ………………………………………… 3

6Installationofthebeltcover ……………………………………………………… 3

7Precautiononoperation …………………………………………………………… 3

HOW TO USE ……………………………………………… 4

1Installationofneedles ……………………………………………………………… 4

2Windingofthebobbinthread……………………………………………………… 4

3Selectionofthethread……………………………………………………………… 5

4Threadingofneedlethreads ……………………………………………………… 5

5Adjustmentoffeed(stitch)lengthandbackstitch……………………………… 6

6Settingofbobbins …………………………………………………………………… 6

7Threadingofbobbinthreads ……………………………………………………… 7

8Adjustmentofbobbinthreadstension…………………………………………… 7

9Balanceofthreadstension ………………………………………………………… 7

:Adjustmentofneedlethreadstension …………………………………………… 7

AAdjustmentofthepresserfootpressure………………………………………… 7

BTimingbetweentherotatinghookmotionandtheneedlemotion…………… 8

CAdjustmentofthefeeddogheight ……………………………………………… 9

D

Relationshipbetweentherotatinghookmotionandthethreadtake-uplevermotion

… 10

ERelationshipbetweentherotatinghookmotionandtheopenermotion …… 10

FRelationshipbetweentheneedlemotionandthefeeddogmotion…………… 11

GSafetyclutch …………………………………………………………………………12

HAdjustmentofupperfeedlength(needleside) ………………………………… 13

IAdjustmentofforward/backwardfeedlength ………………………………… 13

JAdjustmentoftheoutsidepresserfootandtheinsidepresserfoot ………… 13

KInstallationofthemovableknife…………………………………………………… 15

LInstallationpositionofthethreadtrimmercam………………………………… 16

MAdjustmentofthethreadtrimmercam ………………………………………… 16

NAdjustmentofthethreadtensionreleasing……………………………………… 17

O

Adjustmentofmeshingpressurebetweenthemovableknifeandthexedknife

…… 18

PSharpeningofthexedknife ……………………………………………………… 18

Q

Adjustmentofthethreadtrimmerwithchangingthewidthbetweenneedles

… 19

RInstallationofthesolenoidarm …………………………………………………… 20

SRemovalprocedureofthehook…………………………………………………… 20

SPECIFICATIONS ……………………………………………… 21

PREPARATION FOR OPERATION

1 Adjustment of the needle stopping position

1 . Adjustment of “UP” position

Whenthepedaliskickeddownbyheel,themachinestopsat“UP”position.

Ifmarksdeviatelargerthan3mm,adjustasfollows.

( 1 )Disconnecttheplug(12pins)ofcablefromthemachinehead.

( 2 )Runthemachineandstopat“UP”position.

( 3 )Whileholdingthepulley,insertthe“Adjustingtool”inthehole Ⓐ,thenturnthetool.

2 . Adjustment of “Down” position

Whenthepedalis“Neutral”themachinestopsat“Down”position.

Ifmarksdeviatelargethan5mm,adjustasfollows.

( 1 )Disconnecttheplug(12pins)ofcablefromthemachinehead.

( 2 )Runthemachineandstopat“Down”position.

( 3 )Whileholdingthepulley,insertthe“Adjustingtool”inthehole Ⓑ,thenturnthetool.

3 . Conrmthestopoperation,thensettheplug(12pins)comingfromthemachineheadintothe

receptacle.

Timingmark

Whitemark Upposition

DownpositionBlackmark

Adjustingtool

UP上

later

earlier

DOWN下 Timingoftheneedle

Ⓐ

Ⓑ

— 1 —

— 2 —

MC70M Specific gravity (15 ) = 0.86 (g/cm： ℃ 3)

arrows in the below figure.

For oil, use “MC70M” specified by 

our company.

Oil level should be periodically checked. If oil level

Fill the oil reservoir with oil up to “H” mark.

is found below “L” level replenish oil to “H” level. 



   

  

 

USAGE PRECAUTION

Oillevelmark

Lubrication (2)

Lubrication (1)

※ Refer

： ℃Viscosity (40 ) = 10.9 (mm2/s)

When a new sewing machine is used for the

first time, or sewing machine left out of use for

considerably long time is used again, replenish a

suitable amount of oil to the portions indicated by

USAGE PRECAUTION

3 Lubrication condition

Seedrippingofoilthroughtheoilsightwindowto

checkoilingconditionduringoperation.

Conrmthatoilhasbeendrainedfromtheoil

tankwhentheoperationisstopped.

Whendust,etc.accumulateintheoiltank,remove

therubberplugtoclean.

4 Adjustment of lubrication to the

rotating hook

5 Precaution for the built-in type detector

1 . Sincetheopticaltypedetectingelementisusedinthedetector,preventdustoroilfromstickingto

thedetectingplatewhenthesewingmachinepulleyisremovedforadjustment.

Iftheyhavestuck,wipethemo󱐯withsoftclothcarefullysothatthesurfaceisnotscratched,do

notletoilpermeatetheclearanceonthedetectingplate.

2 . Incaseofdisconnectionofthepositiondetectorconnector,runningo󱐯thebeltorcomplete

constraintandoverload,themotorisautomaticallyturnedo󱐯afterpredeterminedtimetoprevent

burningofthemotor.(However,incaseofhalf-constraintandoverload,thepowermaynotbe

turnedo󱐯.)Afterthefailureiseliminated,thenormaloperationisresumedbyturningo󱐯thepower

oncethenturningonagain.

Thesameoperationoccursforthedetectormalfunctionorthelinebreakage.

6 Installation of the belt cover

1 . Installthebeltcoveronthemachinesideforsafety.Refertotheprovidedinstructiondocument

containedinthesamepackage.

2 . Installthebeltcoveronthemotorsideforsafety.

7 Precaution on operation

( 1 ) Whenthepoweristurnedonoro󱐯,keepfootawayfromthepedal.

( 2 ) Itshouldbenotedthatthebrakemaynotworkwhenthepowerisinterruptedorpowerfailure

occursduringsewingmachineoperation.

( 3 ) Sincedustinthecontrolboxmightcausemalfunctionorcontroltroubles,besuretokeepthe

controlboxcovercloseduringoperation.

( 4 ) Donotapplyamultimetertothecontrolcircuitforchecking,otherwisevoltageofmultimeter

mightdamagesemiconductorcomponentsinthecircuit.

Oilsight

window

Rubberplug

Adjusting

screw

Decrease Increase

Nut

— 3 —

HOW TO USE

1 Installation of needles

Note: Before installing the needles, be sure to turn o󱐯 the power.

2 Winding of the bobbin thread

Note: When bobbin thread is wound, keep the presser foot lifted.

　Adjustment ●Tension of wound thread Slackwindingisrecommendedforpolyesterthreadand

nylonthread.

●Conically wound thread Movethethreadguidetowardsmallerdiameterofwound

threadlayer.

●Amount of wound thread Loosenthewindingamountadjustmentscrewtodecrease

threadwindingamountandtightenthescrewtoincrease

threadwindingamount.

Windingtension

adjustmentnut

Evenwinding

amountof80%

offullcapacity

Windingamount

adjustmentscrew

Threadguide

Double-Needle

Inserttheneedleuptothebottomofneedle

clampandtightenthescrewkeepingthe

longgroovesideofneedlefacetoface

Insuﬃcientinsertion

Gap

Longgroovesareopposite

Longgroove

leftside

Needledistorted

Single-needle

— 4 —

Produkt Specifikationer

Mærke:	Juki
Kategori:	Symaskine
Model:	LU2-4410_4430-B1T-CS

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