JUKI LU2-4652-B1T Manuale utente

A181E101P01

SINGLE-NEEDLE LOCKSTITCH COMPOUND-FEED

AUTOMATIC UNDERTRIMMER

INDUSTRIAL SEWING MACHINE

MODEL

INSTRUCTION MANUAL

LU2-4652-B1T

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Installingtheaircylinderassembly ……………………………………………… 1

2Connectingtheelectriccablestothecontrolbox ……………………………… 1

3Adjustmentofthestitchlengthbeforetrimming ……………………………… 3

4Operationspeedadjustmentofinstantalternatingaircylinder ……………… 4

5Heightadjustmentoftheautomaticpresserfootlifter………………………… 4

6Adjustmentoftheneedlestoppingposition……………………………………… 5

USAGE PRECAUTION ……………………………………………… 6

1Lubrication( 1 )  ……………………………………………………………………… 6

2Lubrication( 2 )  ……………………………………………………………………… 6

3Lubricationcondition………………………………………………………………… 7

4Adjustmentoflubricationtotherotatinghook ………………………………… 7

5Precautionforthebuilt-intypedetector ………………………………………… 7

6Installationofthebeltcover ……………………………………………………… 7

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

HOW TO USE ……………………………………………… 8

1Installationoftheneedle …………………………………………………………… 8

2Windingofthebobbinthread……………………………………………………… 8

3Selectionofthethread……………………………………………………………… 9

4Threadingoftheneedlethread…………………………………………………… 9

5Adjustmentoffeed(stitch)lengthandbackstitch……………………………… 10

6Settingofthebobbin………………………………………………………………… 10

7Adjustmentoftheneedlethreadguide ………………………………………… 10

8Threadingofthebobbinthread…………………………………………………… 11

9Adjustmentofthebobbinthreadtension………………………………………… 11

:Balanceofthreadstension ………………………………………………………… 11

AAdjustmentoftheneedlethreadtension………………………………………… 11

BAdjustmentofthepresserfootpressure………………………………………… 11

CAdjustmentoftheoutsidepresserfootandinsidepresserfoot ……………… 12

DInstantalternatingswitch ………………………………………………………… 13

EThestopperscrewforadjustingthemaximumalternatingstroke ………… 13

FInstallingthefeedregulatorbracket……………………………………………… 14

GAdjustmentofthealternatingstrokesensingpotentiometer ………………… 14

HTimingbetweentherotatinghookmotionandtheneedlemotion…………… 15

IAdjustmentofthefeeddogheight………………………………………………… 16

J

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

… 17

KRelationshipbetweentherotatinghookmotionandtheopenermotion …… 17

LRelationshipbetweentheneedlemotionandthefeeddogmotion…………… 18

MSafetyclutch ………………………………………………………………………… 19

NAdjustmentofupperfeedlength(needleside) ………………………………… 20

OAdjustmentofforward/backwardfeedlength ………………………………… 20

PInstallationofthemovableknife…………………………………………………… 21

QInstallationpositionofthethreadtrimmercam………………………………… 22

RAdjustmentofthethreadtrimmercam ………………………………………… 22

SAdjustmentofthethreadtensionreleasing……………………………………… 23

T

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

… 24

USharpeningofthexedknife ……………………………………………………… 24

SPECIFICATIONS ……………………………………………… 25

1 Installing the air cylinder assembly

( 1 ) Aligntheaircylinderassemblytothebackofthearmasshownbelowandthentthedrivinglink

intothepin.

 Fitadrivinglinkbetweenthenylonwashers.

( 2 ) Installtheaircylinderassemblyonthebackofthearm.

 Tightenthebracketandthebackofthearmwiththeenclosedbolt.

2 Connecting the electric cables to the control box

Connectwiresandpipesasfollows.

( 1 ) Installthesolenoidvalveandthelterregulatorassembly①withinthereachoftheurethanetube

/cordunderthetable.

( 2 ) Installtwoattachedelbowunions②,③ontherearcoverlocatingatthebackofthearm.

( 3 ) Arrangepipingbyurethanetubesbetweentheupperelbowunion②installedbystep( 2 ) andthe

portB( ④ B )oftheupperpresserfootliftersolenoidvalve④,andbetweenthelowerelbowunion

③andtheportA( ④ A ).

( 4 ) Connecttheconnecter⑤ofthepresserbarliftersolenoidvalve④tothepresserfootlifter

connectoronthecontrolbox.

( 5 ) Connecttheurethanetube⑥fromthetopofthesewingmachinetotheportA( 7 Ⓐ ) ofthe

instantalternatingsolenoidvalve⑦.

( 6 ) Connectthe3-pinconnector⑧ofthesewingmachineconnectorandtheconnectoroftheinstant

alternatingsolenoidvalve⑦.

( 7 ) Whenthekneeswitch⑨issubstitutedfortheinstantalternatingswitch,connectthe2-pin

connector⑩suppliedasanoptionBtothekneeswitch.

Drivinglink

Nylon

washer

Bracket

Backofthearm

Bolt

Aircylinderassembly

PREPARATION FOR OPERATION

—1 —

( 8 ) Connectbyurethanetubebetweentheupperpartelbowunions⑪installedontheaircylinder

assemblyandportAofthesolenoidvalveassembly⑬.

 Similarly,connecttheurethanetubebetweenlowersideofelbowunions⑫andportBofthe

solenoidvalveassembly.

( 9 ) ConnecttheairsupplysourcetotheINportofthelterregulator①.

(10)Tietogetherurethanetubesandcordswithattachedbindingbands.

Note:Setthestandardairpressureoftheregulatorto0.4MPa(4kgf/cm2).

⑥④Bport ⑬Bport

⑬Aport

④Aport

⑦Aport

INporttotheair

supplysource

Kneeswitch

LF-FM-CFT

(Option)

①

Urethanetube

OPTIONBOPTIONAF・L S.M

⑪

⑫

②

③

⑤

⑨

⑩

⑧

Aircylinderassembly

PREPARATION FOR OPERATION

—2 —

3 Adjustment of the stitch length before trimming

Dependingonsewingconditions,thestitchimmediatelybeforetrimmingmaynotbeformedcorrectly.

Thismaycausethetrimmedtaillengthtobelong.

Inthiscase,adjustthelengthofthestitchimmediatelybeforethetrimmingpositiontoensurethata

properstitchisformed.Asreference,thestandardstitchlengthis1to2mm.Thelengthofthestitch

immediatelybeforetrimmingcanbeadjustedbymovingthepositionoftheknuckletotheair

cylindershaftup/down.Adjustwiththefollowingmethods.

( 1 ) Loosenthenutontheknuckle.

( 2 ) Rotatetheaircylindershaft.

 Adjustthepositionoftheknuckletotheair

cylindershaft.

( 3 ) Thestitchimmediatelybeforetrimmingisas

follows.

・Duringforwardstitching:

Lookingfromabove,turntheshaft

clockwisetochangetoreversestitching.

・Tooshortduringreversestitching:

Lookingfromabove,turntheshaft

clockwise.

・Toolongduringreversestitching:

Lookingfromabove,turntheshaft

counterclockwise.

Thestitchlengthchangesabout1mmwhen

theshaftisrotatedonce.

Inthepositionoftheknucklewhenshipping,

dimensionAbetweenthelowersurfaceofthe

aircylinderandtheuppersurfaceofthe

knuckleis22mmliketherightgurewiththe

aircylinderdrawnin.

Shaft

Nut

Knuckle

PREPARATION FOR OPERATION

—3 —

4 Operation speed adjustment of instant alternating air cylinder

( 1 ) Toadjustthespeedoftheaircylinderatthemaximuminstantalternating,adjustthehandle①

withplatedlocknutonthedualspeedcontrolleroftheinstantalternatingsolenoidvalve(lower

side).

( 2 ) Toadjustthespeedoftheaircylinderattheinstantalternatingreturn,adjustthehandle②with

theblackcoloredlocknutonthedualspeedcontrolleroftheinstantalternatingsolenoidvalve(lower

side).

5 Height adjustment of the automatic

presser foot lifter

Thepresserfootlifterheightattheautomaticpresser

canbeadjusted.

( 1 ) Removethetopcover.

( 2 ) Slidethestopperplateonthepresserfootlifterair

cylinderupanddowntoadjust.

①

②

Stopper

Backofthearm

PREPARATION FOR OPERATION

—4 —

PREPARATION FOR OPERATION

6 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3mm,adjustasfollows.

( 1 )Disconnecttheplug(12pins)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5mm,adjustasfollows.

( 1 )Disconnecttheplug(12pins)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(12pins)comingfromthemachineheadintothe

receptacle.

Timingmark

Whitemark

Blackmark

Upposition

Downposition

Adjustingtool

later

earlier

DOWN Timingoftheneedle

Ⓐ

Ⓑ

—5 —

MC70M ：Specific gravity (15℃) = 0.86 (g/cm3)

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

—6 —

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.

3 Lubrication condition

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

checkoilingconditionduringoperation.

4 Adjustment of lubrication to the

rotating hook

USAGE PRECAUTION

Oilsightwindow

Adjustingscrew

IncreaseDecrease

Nut

—7 —

Indice

Manuali Macchina da cucire popolari di altre marche

Riccar

Riccar RL634DE Manuale utente

Singer

Singer 2517 Manuale utente

Pfaff

Pfaff 3307-1 SERIES Manuale utente

Janome

Janome Quilt Maker Pro 18 VERSA Manuale utente

Siruba

Siruba C007JP Manuale utente

Husqvarna Viking

Husqvarna Viking Designer SE Manuale utente

Singer

Singer 148-5 Manuale utente

IKEA

IKEA SY Manuale utente

Pfaff

Pfaff 571 Manuale utente

Singer

Singer 15-91 Manuale utente

Brother

Brother BB370 Manuale utente

Pegasus

Pegasus WT100 Series Manuale utente

Reliable

Reliable 7100DB Manuale utente

Pfaff

Pfaff 937 Manuale utente

Singer

Singer 6038 Manuale utente

Singer

Singer 413K Manuale utente

Pfaff

Pfaff 1471 E1 Manuale utente

Kenmore

Kenmore 16677 - Serger Sewing Machine Manuale utente