Mitsubishi Electric LT2-2230-B1T User manual

A180E128P03
INSTRUCTION MANUAL
DOUBLE-NEEDLE LOCKSTITCH NEEDLE-FEED
AUTOMATIC UNDERTRIMMER
INDUSTRIAL SEWING MACHINE
LT2-2230-B1T
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andadjustmentonlubricationtothethreadtakeuplever … 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……………………………… 7
6Adjustmentoftheneedlethreadguide ………………………………………… 7
7Settingofbobbins …………………………………………………………………… 7
8Threadingofbobbinthreads ……………………………………………………… 8
9Adjustmentofbobbinthreadstension…………………………………………… 8
:Adjustmentofneedlethreadstension …………………………………………… 8
AAdjustmentofthethreadtakeupspring………………………………………… 8
BTimingbetweentherotatinghookmotionandtheneedlemotion…………… 9
CAdjustmentofthepresserfootpressure………………………………………… 10
DAdjustmentofthefeeddogheight ……………………………………………… 11
E
Relationshipbetweentherotatinghookmotionandthethreadtake-uplevermotion … 12
FRelationshipbetweentherotatinghookmotionandtheopenermotion …… 12
GRelationshipbetweentheneedlemotionandthefeeddogmotion…………… 13
HInstallationpositionofthefeedcam ……………………………………………… 14
IAdjustmentofforward/backwardfeedlength ………………………………… 14
JInstallationofthemovableknife…………………………………………………… 15
KInstallationpositionofthethreadtrimmercam………………………………… 16
LAdjustmentofthethreadtrimmercam ………………………………………… 16
MAdjustmentofthethreadtensionreleasing……………………………………… 17
N
Adjustmentofmeshingpressurebetweenthemovableknifeandthexedknife … 18
OSharpeningofthexedknife ……………………………………………………… 18
P
Adjustmentofthethreadtrimmerwithchangingthewidthbetweenneedles … 19
QInstallationofthesolenoidarm …………………………………………………… 20
RRemovalprocedureofthehook…………………………………………………… 20
SPECIFICATIONS ……………………………………………… 21

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3mm,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5mm,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
Blackmark
Upposition
Downposition
Adjustingtool
UP上
later
earlier
DOWN下 Timingoftheneedle
Ⓐ
Ⓑ
PREPARATION FOR OPERATION
—1 —

USAGE PRECAUTION
Amountofoil…… 5,6drops
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.
Oillevelmark
—2 —

Increase
Oilsightwindow
Decrease
Lubrication
adjustmentscrew
3 Lubrication condition and
adjustment on lubrication to
the thread take up lever
(1) Seedrippingofoilthroughtheoilsightwindow
tocheckoilingconditionduringoperation.
( 2 ) Adjustlubricationquantitytothethread
takeuplevermechanismbyturningthe
lubricationadjustmentscrew.
4 Adjustment of lubrication to the
rotating hook
Adjusting
screw
Decrease Increase
Nut
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.
USAGE PRECAUTION
—3 —

1 Installation of needles
Note: Before installing the needles, be sure to turn o󱐯 the power.
HOW TO USE
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
Needledistorted
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
—4 —

HOW TO USE
Threadtensionreleasingbutton R1L1
R2
R3
R4
R5
L2
L3
L4
L5
R6
L6
R7
R8L8
L7
R9
L9
R 10 L 10
R 11 L 11
R 12
R 13
R 14
L 12
L 13
L 14
A B A AB
Note:Whenneedles
ofsmallgauge(#11
orless)areused,each
needlethreadshould
bewoundabout3/4
rotationaroundneedles
andthenpassed
throughneedleeyesas
showninthegure,to
assureneatstitches.It
isrecommendedtouse
steppedneedle.
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.
Stwistthread
Ztwistthread
—5 —

HOW TO USE
3 . Ifthestrongtwistedthread(nylonorTetron,etc.)isusedandneedlethreadstensionisstrong(about
500gformore),therightthreadmaybereleasedfromthethreadtensiondisc.Inthiscase,thread
onlytherightthreadasshowninthegure(keeptheleftthreadstandard).
Pin
Needlethread(right)
—6 —

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.
Feedlengthsettingdial
Reversesewinglever
Touchbackswitch
6 Adjustment of the needle
thread guide
Adjusttheneedlethreadguideoftheneedle
threadtensionadjusteraccordingtothefabric,the
thread,andsewingcondition.
7 Setting of bobbins
( 1 ) Pullout5cmthreadtailfrombobbins.
( 2 ) Putbobbinsintohooksinthedirectionasthe
followinggure.
Needle
thread
guide
position
Leftside Center Rightside
Fabric Heavy Standard Light
Needle
thread
supply
More Standard Less
Bedslide
Hook
Bedslide
Thread
Hook
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