Mitsubishi Electric LY2-3310-B1T User manual

A180E388P03
INSTRUCTION MANUAL
SINGLE-NEEDLE LOCKSTITCH UPPER AND LOWER FEED
AUTOMATIC UNDERTRIMMER
INDUSTRIAL SEWING MACHINE
LY2-3310-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 …………………………………………………………………………… 2
2Adjustmentoflubricationtotherotatinghook ………………………………… 2
3Periodicalcleaning…………………………………………………………………… 3
4Precautionforthebuilt-intypedetector ………………………………………… 4
5Installationofthebeltcover ……………………………………………………… 4
6Precautiononoperation …………………………………………………………… 4
HOW TO USE ……………………………………………… 5
1Installationoftheneedle …………………………………………………………… 5
2Windingofthebobbinthread……………………………………………………… 5
3Threadingoftheneedlethread…………………………………………………… 6
4Adjustmentoffeed(stitch)lengthandbackstitch……………………………… 6
5Balanceofthreadstension ………………………………………………………… 6
6Adjustmentoftheneedlethreadtension………………………………………… 6
7Adjustmentofthebobbinthreadtension………………………………………… 7
8Adjustmentofthepresserfootpressure………………………………………… 7
9Adjustmentofthefeeddogheight ……………………………………………… 7
:Adjustmentofthefeedfootandthepresserfoot ……………………………… 8
ATohandlethreadatthestartofsewing ………………………………………… 9
BAdjustmentofthethreadtrimmerdevice ……………………………………… 9
CAdjustmentofthegapbetweenthepulleyandthemachinehead…………… 12
SPECIFICATIONS ……………………………………………… 13

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2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.
PREPARATION FOR OPERATION
Timingmark
Rotatingdirection
1stmark
Pulley
Upposition
Downposition
1stmark
3rdmark
3rdmark Ⓐ
ⒷAdjustingtool
UP
later
earlier
Pulley
DOWN Timingoftheneedle
—1 —

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
At①and②,pleaselubricate
theoilbraidundertherubberplug.
②
①
Ⓐ
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.
—2 —

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.)
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.
—3 —

4 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.
5 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.
6 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
—4 —

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
HOW TO USE
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.
—5 —

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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.
②
⑥
③
④
⑤
⑪
⑩
⑨
⑧
⑦
①
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
Touchbackswitch
PUSHlever
Feedlength
settingdial
Reversesewing
lever
HOW TO USE
—6 —

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.
HOW TO USE
ScrewⒶ
Threadtensionspring
Loosen
Tighten
Standard30mm
Strengthen
<Presserfootpressure>
Weaken
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
StrengthenWeaken
<Feedfootpressure>
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