Mitsubishi Electric LT2-2250-B1T User manual

Brand: Mitsubishi Electric

Model: LT2-2250-B1T

Category: Sewing machines

Type: User manual

The Mitsubishi Electric LT2-2250-B1T industrial sewing machine is designed for high-precision double-needle lockstitch and corner stitching applications. Equipped with an automatic undertrimmer, it ensures clean and accurate results. Its needle-feed system provides consistent stitch quality, making it ideal for a wide range of fabrics.

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.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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.

— 1 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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

— 2 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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

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 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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

— 4 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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

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.

— 5 —

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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

— 6 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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

Needle

thread

guide

position

Leftside Center Rightside

Fabric Heavy Standard Light

Needle

thread

supply

More Standard Less

— 7 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

8 Threading of bobbin threads

( 1 ) Extendthebobbinthread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.

Adjustment of bobbin threads tension

Adjustment of needle threads tension

Adjustneedlethreadstensionbyturningthread

tensionnuts.

Adjustment of the thread take up spring

1 .

Adjusting movable range of the thread take up spring

( 1 ) Toadjustthethreadtakeupspring ①

fortheleftthread,loosenthestopperstop

screw ②andmovethestopper ③.

( 2 ) Toadjustthethreadtakeupspring ④for

therightthread,loosenthestopperstop

screw ⑤andmovethestopper ⑥.

2 . Adjusting intensity of the thread take up spring

( 1 ) Leftthread:



Loosenthelocknut ⑦,andremovethefaceplate.

 Loosenthescrew ⑪inthearm.

 Turntheadjustingshaft ⑧.

 Afteradjustment,tightenthescrew ⑪,and

tightenthelocknut ⑦.

( 2 ) Rightthread:



Loosenthescrew ⑨,andturntheadjustingnut ⑩.

 Afteradjustment,tightenthescrew ⑨.

HOW TO USE

— 8 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

B Timing between the rotating

hook motion and the needle

motion

Adjustrightandlefttiminginthesamewayat

thesametime.

Note:

Ifyouremovethepresserfoot,thethroatplate,

andthefeeddog,itmakeseasiertoadjust.

( 1 ) Setfeedlengthto4.5mm.

( 2 ) Loosentwoscrews Ⓐ,andremovethelink.

( 3 ) Loosenallscrews Ⓑ,Ⓒ,Ⓓ,Ⓔ,andslideeach

hooksaddletooutside.

Note:Atthistime,don’tloosenthesetscrew

Ⓓtoomuch.

( 4 ) Checkthattherstscrewofthelargegear

entersanotch,andsettheneedlebaratthe

lowestposition.

( 5 ) Slidethelargegeartothehooksaddleand

meshwiththesmallgear.Atthistime,adjust

itsothatoneofthreesetscrews Ⓔfaces

upward.

( 6 ) Lifttheneedlebar2.4mmfromthelowest

position,andadjustthesaddlehookposition

sothatthegapbetweenthetipofthehook

andthescarfoftheneedleis0.05mmor

lower.

( 7 ) Tightenscrews Ⓑ,Ⓒ.

Note:BecarefulnottoovertightenscrewsⒸ.

( 8 ) Haveasmallgapbetweenthelargegearand

thesaddlehook,andtightenallsetscrews Ⓓ.

( 9 ) Lifttheneedlebar2.4mmfromthelowest

positionagain,andadjustthetipofthehook

positionsothatitisinthecenteroftheneedle.

(10) Whilecheckingthatthetipofthehookis

inthecenteroftheneedle,andtightenset

screws Ⓔ.

 Note:Tighteneachscrew Ⓔlittlebylittle.

(11) Installthelinkwiththescrews Ⓐasbefore.

(12) Returnthemachineheadtotheoriginal

positionandadjusttheneedleguideposition

sothatitcomelightlyincontactwiththe

needle.

HOW TO USE

Small gear

Large gear

Set Screw 󰽨

Figure seen from

the arrow direction

Screw 󰽤

Link

— 9 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

・Adjustment of the needle up and down position

Whentheneedleislifted2.4mmfromthelowest

position,adjusttheneedlepositionsothatthegap

betweenthetopofneedleeyeandthetipofthe

hookis1.0to2.0mm.

( 1 ) Removethesetscrew Ⓐ.

( 2 ) Rotateoneturntheneedleclamp Ⓑ

(Adjustmentpitchis0.6mm),orrotatehalf

turnthestopper Ⓓwithtakingo󰮏theset

screw Ⓒ(Adjustmentpitchis0.3mm).

( 3 ) Returntheneedleclamp Ⓑtotheposition

beforeadjustingandfullytightentheset

screw ⒶandⒸ.

C Adjustment of the presser foot

pressure

Adjustthepresserfootpressurebyturningthe

pressureadjustingscrew.

HOW TO USE

— 10 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Adjustment of the feed dog height

Thefeeddogheightandthepresserfootpressure

mustbeadjustedaccordingtothefabric.

◆ Thefabricwillbedamagedifthefeed

dogextendstoohigh,orifthepresserfoot

pressureistoolarge.

◆ Anevenstitchlengthcannotbeassuredif

thefeeddogistoolow,orifthepresserfoot

pressureistoosmall.

◆ Thefeeddogheightisthepositionwherethe

needleisatthetopposition.

Adjustment of the feed dog height

( 1 ) Leanthemachineheadbackward.

( 2 ) Turnthepulleybyhandandstopitatthe

positionwherethefeeddogrisestothe

maximumheight.

( 3 ) Loosenthefeedbarscrew.

( 4 ) Verticallymovethefeedbar(inthedirection

indicatedbythearrowinthegure)toadjust

ittoanadequateheight.

( 5 ) Afteradjusting,tightenthefeedbarscrew.

The feed dog height is factory-adjusted to 1.2 mm.

HOW TO USE

— 11 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Relationship between the rotating

hook motion and the thread take-up

lever motion

Whenthetimingbeltisremovedforreplacement,

etc.,therelationbetweentherotatinghookmotion

andthethreadtake-uplevermotionshouldbe

adjustedasfollows:

( 1 ) Turnthepulleyandstopwhenthethread

take-upleverisliftedtothehighestposition.

( 2 ) Leanthemachineheadbackwardandcheck

thatthearrow(timingmark)putonthe

timingbeltisalignedwiththeblacklineon

thebossoflowershaftbearing.

( 3 ) Ifthetimingmarkisnotinlinewiththe

blackline,removethetimingbeltandinstall

itagaintoadjust.

Relationship between the rotating

hook motion and the opener motion

( 1 ) Turnthepulleybyyourhandandstopit

atthepositionwheretheopenerholderis

locatedmostremotelyfromthethroatplate.

( 2 ) CheckthatthegapbetweenthelugⒶand

theopenerisapproximately0.2mm.

( 3 ) Ifthegapistoolargeorsmall,loosenthe

openerholderscrewⒷandadjustpositionof

theopener.

HOW TO USE

— 12 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Relationship between the needle

motion and the feed dog motion

( 1 ) Setthestitchlengthto“0”onthefeedlength

settingdial.

( 2 ) Settheneedleatthelowestposition.

( 3 ) Leanthemachineheadbackward.

( 4 ) Loosenthefeedrockshaftcranksetscrews

Ⓐ,Ⓑ.

( 5 ) Adjustthedistancebetweenthepressurebar

andtheneedlebarto14.1mmandtemporary

tightenthefeedrockshaftcranksetscrews

Ⓐ,Ⓑ.

( 6 ) Checkthatthefeedrockshaftcrank(right)

isconnectedwiththelinkatarightangleas

showninthegure.

( 7 ) Iftheconnectionisnotarightangle,remove

theRearcover,loosenscrewⒸandmovethe

linktoconnectthefeedrockshaftcrank(right)

withthelinkatarightangle.

( 8 ) Afteradjusting,fullytightenallscrewsⒶ,Ⓑ,

Ⓒ.

 Atthistime,checkthattheneedleentersthe

holeatcenterofthefeeddog.

HOW TO USE

— 13 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

H Operation of the needle bar

(left or right)

●

Thestoplevershouldbesetto“L”or“R”position.

( 1 ) Leftneedlebarstopoperation

Movethestopleverto“L”positiontostop

theleftneedlebar.

( 2 ) Rightneedlebarstopoperation

Movethestopleverto“R”positiontostop

therightneedlebar.

( 3 ) Doubleneedlebaroperation

Tochangesingle-needle(leftorright)

operationtodouble-needleoperation,depress

thepushleverbackward.Thestoplever

willautomaticallyreturnto“0”positionand

double-needleoperationbecomespossible.

Note:Beforeoperatingthestoplever,checkthat

theneedlebarpositionissetatthelowest

positionandthemachineisstoppedoperation.

I Relationship between angle of

the corner stitching and stitch

length

( 1 ) Inordertoassureneatcornerstitching,stitch

lengthshouldbedeterminedinreferenceto

angleofcornerstitchingfromthefollowing

table(applicableonlyto1/4needlegauge).

( 2 ) Bydeterminingstitchlengthofinside

stitchingforagivenangleofcornerstitching,

thenumberofoutsidecornerstitchescanbe

identiedfromthetable.

( 3 ) Forexample:Whenstitchlengthof40°

cornerstitchingisdeterminedto2.9mm,the

numberofstitchesis“6”.

HOW TO USE

Relationship between stitch length and number of

stitches (applicable only to ¼ needle gauge)

Numberof

stitches

Angleof

cornerstitching

2345678

30°

40°

50°

60°

70°

80°

90°

100°

110°

120°

130°

140°

5.5

4.6

3.8

3.2

2.7

2.2

1.8

1.5

1.1

4.6

3.7

3.0

2.5

2.1

1.8

1.5

1.2

4.4

3.4

2.8

2.3

1.9

1.6

1.3

4.8

3.5

2.7

2.2

1.8

1.5

1.3

4.0

2.9

2.3

1.9

1.5

1.3

3.7

2.5

2.0

1.6

3.0

2.2

1.7

— 14 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

J Adjustment of the corner

stitching device “0” position

( 1 ) Whenthestopleverisset“0”position,adjust

sothatthegapAandBbetweenthecam

andtwohingedpinsoftheneedlebarguide

bracketareequalasfollows.

① Roughadjustment:

 Adjustsothatthecenterdistance

betweentwoholesofthestudboltis115

mmbylooseningthenutandturningthe

studbolt.

② Fineadjustment:

 Loosentheguidepinsetscrew Ⓐ ,and

setsothatthegapAandBbetweenthe

camandtwohingedpinsareequal.

( 2 ) Afteradjusting,movethestopleverto“L”

or“R”position,andcheckthatthecorner

stitchingdeviceworkcorrectly.

Adjustment of the corner stitching

device / height of the needle bar

Ifoneneedlestopisn’tworkingcorrectlyin“L”or“R”

position,adjustheightoftheneedlebarasfollows.

( 1 ) Removethefaceplateandtherubberplug.

( 2 ) Movetheneedlebartothepositionwhere

thescrewoftheneedlebarcrankrodisable

tobeadjustedbyturningthepulley.

( 3 ) Loosenthescrew.



Note:Becarefulnottoloosenthescrewtoomuch.

(4)

Turnthepulleyandstopitatthepositionwhere

theneedlebarcomestothehighestposition.

(5)

Adjusttheeccentricbushing,andtightenthescrew.

Workingcontents Howtoadjust

Whenoneneedlestopisn’tenough

(Whenthestoppingneedlebarfallen)

Liftthe

needlebar

Loweranotchofthe

eccentricbushing.

○Whentheneedlebarthatstoppingwobbled

○Whenthesmallneedlebarclampcontact

therubbercushionoftheneedlebarguide

bracketstronglyandthemachinetorque

becomeheavier

Lowerthe

needlebar

Raiseanotchofthe

eccentricbushing.

HOW TO USE

— 15 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Installation position of the feed cam

( 1 ) Setthefeedlengthsettingdialtomaximum.

( 2 ) Turnthepulleyandstopitattheposition

wheretheredmarkpointonthepulleymeets

theblackmarkpointonthearm.

( 3 ) Movethefeedcamtothepositionshownin

thegure,andrepeattheforwardstitchand

thebackwardstitch.

 Atthistime,setthefeedcamtothelower

shaftatthepositionwheretheneedle(feed

dog)stops.

M Adjustment of forward/

backward feed length

Theforward/backwardfeedlengthcanbeadjusted

bymovingtheeccentricpinasshowninthegure.

( 1 ) Loosenthereversestitchshaftcrankscrew.

( 2 ) Toincreaseforwardstitchlength,turnthe

eccentricpinclockwise.

 Toincreasebackwardstitchlength,turnthe

eccentricpincounterclockwise.

Note:Pleaseadjustintherangewherethemark

pointoftheeccentricpinisfacingtothe

reverseblocksideasshowninthegure.

HOW TO USE

— 16 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

N Installation of the movable knife

1 . Initial position of the movable knife

( 1 ) Turnthepulleyandstopitatthepositionwheretheneedlecomestothelowest.

( 2 ) Putthecamrollerintothethreadtrimmercamgroovebypushingthecamfollowercrank.

( 3 ) Inthiscondition,turnthepulleyandstopitatthepositionwheretheblackmarkpointonthe

armmeetsthewhitemarkpointonthepulley.

 Setthecamfollowercrankatthispositionwithascrewdrivertemporarilypreventingthecam

rollercomingoutfromthecamgroove.

( 4 ) LoosenboltsⒶandⒷ.

( 5 ) Adjustsothatthetipslantportionofthemovableknifeprotrudes0to0.5mmfromthexed

knife,asshowninthegureandtightenboltsⒶandⒷ.

2 .

Gap between the movable knife and the lug of

inner hook

( 1 ) Turnthepulleyandstopitattheposition

wheretheneedlecomestothelowest.

( 2 ) Whilepushingthecamfollowercrank,turn

thepulleyandstopitatthepositionwhere

themovableknifemovetothepositionas

showninthegure.

( 3 ) Turntheinnerhookandadjustsothatthe

gapbetweenthemovableknifeandthe

lugofinnerhookisabout0.5mm(screws

ⒶandⒷshouldbeloosenedforthis

adjustment).

HOW TO USE

— 17 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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Mitsubishi Electric LT2-2250-B1T User manual

Brand: Mitsubishi Electric

Model: LT2-2250-B1T

Category: Sewing machines

Type: User manual

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Mitsubishi Electric LT2-2250-B1T User manual

Mitsubishi Electric LT2-2250-B1T User manual

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