Mitsubishi Electric LY2-3300-B0B User manual

A180E352P03
INSTRUCTION MANUAL
SINGLE-NEEDLE LOCKSTITCH UPPER AND LOWER FEED
INDUSTRIAL SEWING MACHINE
LY2-3300-B0B
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
USAGE PRECAUTION ……………………………………………… 1
1Lubrication …………………………………………………………………………… 1
2Adjustmentoflubricationtotherotatinghook ………………………………… 1
3Periodicalcleaning…………………………………………………………………… 2
4Installationofthebeltcover ……………………………………………………… 2
5Precautiononoperation …………………………………………………………… 2
HOW TO USE ……………………………………………… 3
1Installationoftheneedle …………………………………………………………… 3
2Windingofthebobbinthread……………………………………………………… 3
3Threadingoftheneedlethread…………………………………………………… 4
4Adjustmentoffeed(stitch)lengthandbackstitch……………………………… 4
5Balanceofthreadstension ………………………………………………………… 4
6Adjustmentoftheneedlethreadtension………………………………………… 4
7Adjustmentofthebobbinthreadtension………………………………………… 5
8Adjustmentofthepresserfootpressure………………………………………… 5
9Adjustmentofthefeeddogheight ……………………………………………… 5
:Adjustmentofthefeedfootandthepresserfoot ……………………………… 6
ATohandlethreadatthestartofsewing ………………………………………… 7
SPECIFICATIONS ……………………………………………… 8

1 Lubrication
●Pouroiluptothearrowpositionbeforestarting
operation.
…About3cc
…5,6drops
…1,2drops
Foroil,use“PulleySFoil”speciedby
Mitsubishi.
※Refer
 PulleySFoil：Specicgravity(15℃ )=0.86(g/cm3)
  ：Viscosity(40℃ )=18.0(mm2/s)
●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.
2 Adjustment of lubrication to the
rotating hook
Adjustthelubricationamountoftherotatinghook
byturningthescrewⒶ.
USAGE PRECAUTION
Ⓐ
ScrewⒶ
Decrease Increase
Line
Holeforsupply
Supply the oil to the tank of the bed
Filloiluptothelinewhentheoilwouldcome
bottomlevel.
At①and②,pleaselubricate
theoilbraidundertherubberplug.
②
①
—1 —

3 Periodical cleaning
1 . Machine
2 . Motor
Removedustfromthemotorltereveryoneortwomonths.(Continuedoperationwiththelter
cloggedwithlintordustmayoverheatthemotor.)
3 . Control Box
Removedustfromtheconnector.(Iftheconnectoriscoveredwithdust,themachinemight
malfunction.)
4 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.
5 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
Hook
Feeddog
Hook
Feedbar
● Removethethroatplateandcleanthe
feeddog.Reassemblyshouldbedoneby
screwinginthescrew2-3rotationsbyhand
atrst,thentighteningthemevenlyusinga
long-shaftedscrewdriver.
● Leanthemachineheadandcleanthehook
andremoveanydustand/orlintinsidethe
bobbincase.
—2 —

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
1 Installation of the needle
Note: Before installing the needles, be sure to turn o󱐯 the power.
Inserttheneedleuptothebottomof
needleclampandtightenthescrew
keepingthelonggroovesidefacing
totheleft.
Insufficientinsertion Needledistorted
Gap
Longgroove
leftside Timingmark
forDB×1
Timingmark
forDP×17
Needlebar
Note：Ifthreadsnappingoccursduringreversesewingwith
polyesterthreads,itmaybeavoidedbyttingtheneedle
withthelonggrooveshiftedtothefrontside.Normally,
avoidttingtheneedlewiththegroovefacingbackward.
BothneedlesDP × 17and
DB × 1canbeused.
Usethetimingmarksas
showninthegure.
HOW TO USE
—3 —

5 Balance of threads tension
6 Adjustment of the needle
thread tension
●Theneedlethreadtensionshouldbeadjusted
onthebasisofthebobbinthreadtension.
●Adjusttheneedlethreadtensionbyturningthe
threadtensionnut.
 Theneedlethread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.
3 Threading of the needle thread
Withthethreadtake-upleverlocatedattheupper
mostposition,passtheneedlethreadintheorder
showninthefollowinggure.
4 Adjustment of feed (stitch)
length and backstitch
●Adjustmentoffeed(stitch)length…Adjustfeed
lengthbyturningthefeedlengthsettingdial
whiledepressingthereversesewinglever.
●Backstitch…Directionofstitchingcanbe
reversedbydepressingthereversesewing
lever.
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
Feedlength
settingdial
Reversesewing
lever
②
⑥
③
④
⑤
⑪
⑩
⑨
⑧
⑦
①
HOW TO USE
—4 —

7 Adjustment of the bobbin
thread tension
1 . Thebobbinthreadtensioncanbeadjusted
byturningthescrewⒶ.
8 Adjustment of the presser foot
pressure
1 . Adjustthepresserfootpressureaccordingto
thefabricbyturningthepressureadjusting
screw.
2 . Pressureontheboththepresserfootand
thefeedfootcanbeadjusted.(Theadjusting
screwpositionisfactory-adjustedasshownin
thegure.)
3 . Sewingpressureshouldbeadjustedtothe
minimumrequiredstrength.
9 Adjustment of the feed dog
height
1 . Turnthepulleyandstopitattheposition
wherethefeedliftingrockshaftcrank(right)
swingstotheinnermostposition.
2 . LoosenthescrewⒶ.
 Note:Becarefulnottomovethefeedlifting
rockshaftcrank(right)inthelateraldirection.
3 . Adjustthefeeddogheightbyswingingthe
feedliftingrockshaftcrank(left)andmoving
thefeedbar.
4 . Afteradjusting,fullytightenthescrewⒶ.
The feed dog height is factory-adjusted to 1.0 mm.
ScrewⒶ
Threadtensionspring
Loosen
Tighten
30mm
<Presserfootpressure>
StrengthenWeaken
Standard
Throatplate 1.0mm
Feeddog
Feedliftingrockshaftcrank(left)
Feedbar
ScrewⒶ
Feedliftingrock
shaftcrank(right)
20mm
Standard
Strengthen
<Feedfootpressure>
Weaken
HOW TO USE
—5 —

: Adjustment of the feed foot
and the presser foot
1 . To change the balance of the alternating
movements between the feed foot and presser foot
(1) Forexample,toincreasetheriseofthefeed
foot,anddecreasetheriseofthepresserfoot .
①Turnthepulleyuntilthepresserfootis
slightlyraisedfromthethroatplate.
② LoosenthesetscrewⒶ(ontherightside)
locatedonthefeedliftingrockshaftcrank(right).
③Thebuilt-inspringpullsdownthepresser
footuntilitmakescontactwiththethroat
plate.Then,tightenthesetscrewⒶ.
④Thiscompletestheadjustment,i.e.,the
protrusionofthepresserfoothasbeen
decreasedbyasetdistance.And,the
verticalmotionofthefeedfoothasbeen
increasedbythatsamedistance.
(2) Asacontrarycase( 1 ),todecreasetheriseofthe
feedfoot,andincreasetheriseofthepresserfoot.
 First,turnthepulleyuntilthefeedfootis
slightlyraisedfromthethroatplate.Next,
loosenthescrewⒶ.Finally,tightenthe
screwⒶagain.
 Thisdecreasestheriseofthefeedfoot.
2 . Adjustment of the movement height of the
presser foot and feed foot
Note:Whensewingathinfabric,theupanddown
movementshouldbeadjustedatminimum.
●Toadjust,loosenthescrew,andshiftthe
positionofcrankrodboss.
 Upward →Theupanddownmovement
willincrease.(Max.5mm)
 Downward→Theupanddownmovement
willdecrease.(Min.2mm)
3 . A gap between the feed foot and the presser foot
Note: Attheconditionthestitchlengthisatmax.,the
min.gapbetweenthefeedfootandthepresser
footisadjustedtobe5mmasstandard.
●LoosenthescrewⒶ,thenturnthefeed
drivingshaft,sothatthegapⒷcanbe
adjusted.
 Afteradjusting,fullytightenthescrewⒶ.
4 . Proper timing between the upper and lower feed
Note:Althoughtheupperfeedamount(feedfoot)
adjustthelowerfeedamount(feeddog)
areadjustedby1:1,pleaseadjusttheupper
feedamountincreasinglyordecreasingly,
accordingtothematerialtobesewn.
●Toadjust,loosenthenutandshiftthesquare
blockupanddown.
 Upward →Feedingamountwilldecrease
 Downward→Feedingamountwillincrease
Nut
Feedliftingrock
shaftcrank(left)
ScrewⒶ
5mmⒷ
Feedfoot
Presserfoot
Feeddrivingshaftcrank(right) Feeddrivingshaft
Screw
Large
Small
Crankrod
Feedliftingrockshaftcrank(right)
Ⓐ
HOW TO USE
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A To handle thread at the start of
sewing
1 . In the case of open sewing:
Whentheneedlethreadisnotheldbythe
presserfootduringsewing,theendofthe
needlethreadisstitchedontothereverseside
ofthecloth,thusenhancingasewingnish.
Slowlystarttotakeupafewstitchesatthe
beginningsoastopreventtheneedlethread
frombeingo󱐯outoftheneedle.
2 . When the needle thread is held by the
presser foot:
Theendoftheneedlethreadremainsonthe
surfaceofthecloth.
Tostitchinthisway,itispreferabletopull
outthesewnfabrictotheothersideofthe
presserfootattheendofsewing.
Needlethread
Needlethread
Cloth
Needlethread
Cloth
Bobbinthread
HOW TO USE
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