Mitsubishi Electric LT2-2250-B1T Bedienungsanleitung

A180E191P02

INSTRUCTION MANUAL

DOUBLE-NEEDLE LOCKSTITCH NEEDLE-FEED

CORNER STITCHING AUTOMATIC UNDERTRIMMER

INDUSTRIAL SEWING MACHINE

LT2-2250-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

…

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Operationoftheneedlebar(leftorright)………………………………………… 14

IRelationshipbetweenangleofthecornerstitchingandstitchlength ……… 14

JAdjustmentofthecornerstitchingdevice“0”position ……………………… 15

KAdjustmentofthecornerstitchingdevice/heightoftheneedlebar ……… 15

LInstallationpositionofthefeedcam ……………………………………………… 16

MAdjustmentofforward/backwardfeedlength ………………………………… 16

NInstallationofthemovableknife…………………………………………………… 17

OInstallationpositionofthethreadtrimmercam………………………………… 18

PAdjustmentofthethreadtrimmercam ………………………………………… 18

QAdjustmentoftheholdingpressureofthebobbinthread …………………… 19

RAdjustmentofthethreadtensionreleasing……………………………………… 20

S

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

… 21

TSharpeningofthexedknife ……………………………………………………… 21

U

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

… 22

VInstallationofthesolenoidarm …………………………………………………… 23

WRemovalprocedureofthehook…………………………………………………… 23

SPECIFICATIONS ……………………………………………… 24

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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

Ⓐ

Ⓑ

—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

Pressurebar

—2 —

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

USAGE PRECAUTION

Adjusting

screw

Increase

Nut

Decrease

Increase Decrease

Oilsight

window

Lubrication

adjustmentscrew

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 —

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.

HOW TO USE

Windingtension

adjustmentnut

Evenwinding

amountof80%

offullcapacity

Windingamount

adjustmentscrew

Threadguide

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

—4 —

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.

HOW TO USE

Threadtensionreleasingbutton

R1L1

R9L9

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

A B A AB

—5 —

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).

HOW TO USE

Needlethread(right)

—6 —

7 Setting of bobbins

Threadingintherotatinghook(withtension

spring)andinstallationofthebobbincase

( 1 ) Passthebobbinthreadslit①sothatthethread

canbeunwoundontheleftsideofthebobbin.

( 2 ) Passthebobbinthreadintheorderfrom①to

④inthegure.

( 3 ) Matchtheprotrudedportionoftherotating

hookwithrecessedportionⒶofthebobbin

caseandinstallthehookandthebobbincase

totherotatinghookshaft.

( 4 ) Setthebobbincaselatchlever.

( 5 ) Leavethethreadtailonthebed.

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.

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.

HOW TO USE

Feedlengthsettingdial

Reversesewinglever

④Spring

③Guideeye

②Guideeye

①Slit

Thread

Bobbin

Bobbincase

latchlever

Ⓐ

Bobbincase

Needle

thread

guide

position

Leftside Center Rightside

Fabric Heavy Standard Light

Needle

thread

supply

More Standard Less

Touchback

switch

—7 —

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