Mitsubishi Electric LU2-4410-B1T-CS User manual

A180E271P03
INSTRUCTION MANUAL
LOCKSTITCH COMPOUND-FEED AUTOMATIC UNDERTRIMMER
INDUSTRIAL SEWING MACHINES
LU2-4410-B1T-CS (Single-Needle)
LU2-4430-B1T (Double-Needle)
MODEL

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Mitsubishiindustrialsewingmachine.
Pleasereadthisinstructionmanualbeforeoperatingthesewingmachine.Pleasereadalso
“SafetyManual”,“InstructionmanualforMitsubishiLimiservoX”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 —

1 Lubrication (1)
Filltheoilreservoirwithoilupto“H”mark.
Oillevelshouldbeperiodicallychecked.Ifoillevel
isfoundbelow“L”levelreplenishoilto“H”level.
Foroil,use“MC70M”speciedbyMitsubishi.
※Refer
MC70M：Specicgravity(15℃ )=0.86(g/cm3)
：Viscosity(40℃ )=10.9(mm2/s)
2 Lubrication (2)
Whenanewsewingmachineisusedforthe
rst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
arrowsinthebelowgure.
USAGE PRECAUTION
Oillevelmark
—2 —

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 —

HOW TO USE
3 Selection of the thread
Itisrecommendedtouse“S”twistthreadintheleftneedle(viewed
fromfront),and“Z”twistthreadintherightneedle.
Whendiscriminateuseofneedlethreadsisimpossible,use“Z”twist
threadinboththeneedles.
Forbobbinthread,“S”twistthreadaswellas“Z”twistthreadcanbe
used.
4 Threading of needle threads
1 . Passeachneedlethreadthroughthreadguide(A).
Note:Whenthinslipperythread(polyesterthreadorlament
thread,etc.)isused,
Passthethreadthroughthreadguide(B)aswell.
2 . Withthethreadtake-upleverlocatedattheuppermostposition,
passeachneedlethreadintheordershowninthefollowinggure.
Note:Pushingtheneedlethreadtensionreleasingbuttonshown
inthegurebelowopensthesauceroftheneedlethreadtension
adjuster,andtheneedlethreadcaneasilypulledout.
LU2-4410
LU2-4410
LU2-4430
LU2-4430
, , (Detail) to , to (Detail)
L12 L14 R10 R12
(Seedetailedfigure)
Leadthethreadleftward.
(Seedetailedfigure)
Leadthethreadrightward Leadthethreadrightward
Threadtension
releasingbutton
10
14
12 13
12 13 14
11
8
9
7 6
5
3
2
4
1
R2
L2
R1L1
R 10
R 11
L 10
R5R6
R3
R4
R7
R9
R8
L3
L8 L7
L4
L 11
L 12
L 13
L 14
L 15
L 16
R 12
R 13
R 14
L5
L9
L6
Threadtension
releasingbutton
15
16
Stwistthread
Ztwistthread
A B A AB
—5 —

HOW TO USE
5 Adjustment of feed (stitch)
length and backstitch
●Adjustmentoffeed(stitch)length…Adjustfeed
lengthbyturningthefeedlengthsettingdial
whilepushingPUSHlever.
●Backstitch…Directionofstitchingcanbe
reversedbydepressingthereversesewing
leverorpushingthetouchbackswitch.
●Touchbackswitch…Inthecasethattheswitch
isturnedtothearrowdirectionby180°,no
backwardstitchingoccursevenwhenthe
switchispushed.
Usethisfunctiontoavoidthemalfunctionsuch
asunnecessaryreversestitchinginthecase
thatthefabriccomesincontactwiththeswitch
duringsewing.
6 Setting of bobbins
( 1 ) Pullout5cmthreadtailfrombobbins.
( 2 ) Putbobbinsintohooksinthedirectionasthe
followinggure.
Touchback
switch
Feedlengthsettingdial
Reversesewinglever
Bedslide
Hook
Bedslide
Thread
Hook
—6 —

7 Threading of bobbin threads
( 1 ) Putbobbinthreadintotheslit①,passunder
thelug②andextenditabovethebed.
( 2 ) Whileholdingtwoneedlethreadswithyour
lefthand,turnthepulleyonerotationwith
yourrighthand.Thebobbinthreadswill
comeupwhenneedlethreadsareliftedup
asshowninthegure.Needlethreadsand
bobbinthreadsshouldbealignedandled
backwardtogether.
8
Adjustment of bobbin threads tension
9 Balance of threads tension
:
Adjustment of needle threads tension
●Needlethreadstensionshouldbeadjustedon
thebasisofbobbinthreadstension.
●Adjustneedlethreadstensionbyturning
threadtensionnuts.
 Needlethreadstensioncanbealsoadjustedby
changingintensityandmovablerangeofthe
threadtake-upspringincaseofsewingthe
specialfabricandthread.
A
Adjustment of the presser foot pressure
Adjustthepresserfootpressureaccordingtothe
fabricbyturningthepressureadjustingscrew.
HOW TO USE
A○
B×
C×
Balancedtension
Tighttheneedlethreadtensionor
loosethebobbinthreadtension
Loosetheneedlethreadtensionor
tightthebobbinthreadtension
Threadtensionnut
Tighten
Loosen
Thread
①
②
Thread
Opener
Loosen Tighten
Threadtensionscrew
Pressureadjusting
screw
Strengthen Weaken
—7 —