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 —