Mitsubishi Electric LT2-2250-B1T User manual

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 … 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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
R2
L2
R3
R4
R5
R6
L3
L4
L5
L6
R7
L7
R8
R9L9
L8
R 10
L 10
R 11 L 11
R 12 L 12
R 13
R 14
R 15
L 13
L 14
L 15
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
Pin
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 —

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.
9
Adjustment of bobbin threads tension
:
Adjustment of needle threads tension
Adjustneedlethreadstensionbyturningthread
tensionnuts.
A
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
Pre-tensionnut
Tighten
Loosen
Tighten
Loosen
Threadtensionnut
Decrease
Increase
⑤
②
③
⑥
⑨-Rightside
⑧-Leftside
⑦-Leftside
④
⑪
①⑩-Rightside
Tighten
Loosen
Thread
Thread
Opener
Loosen Tighten
Threadtensionscrew
—8 —

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
Tipofthehook
0.05mmorlower
0.05mm
ScrewⒷ
ScrewⒸ
SetscrewⒹ
Smallgear
Largegear
SetScrewⒺ
Figureseenfrom
thearrowdirection
ScrewⒶ
Link
—9 —

・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
SetscrewⒸ
SetscrewⒶ
StopperⒹ
NeedleclampⒷ
Pressureadjustingscrew
Lightfabric
Weaken
Heavyfabric
Strengthen
—10 —

D
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
Throatplate
Feeddog
1.2mm
Feedbarscrew
Feedbar
—11 —

E
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.
F
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
Timingbeltpulley
Timingmark(arrow)
Blacklineonbossof
lowershaftbearing
Timingbelt
Approx.0.2mm
Opener Openerholder
ⒶScrewⒷ
—12 —

G
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
Link
Needlebar
Pressurebar
Feedrockshaftcrank(right)
14.1
ScrewⒷ
ScrewⒸ
Feedrockshaftcrank(middle)
ScrewⒶ
ScrewⒷ
Feedrockshaftcrank(right)
Link
—13 —

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
Pushlever
Stoplever
Angleofcornerstitching
（40°）
Numberofstitch(6)
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 —

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.
K
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.
Studrod
Nut
Nut
Guidepin
115ｍｍ
Stoplever
Hingedpin
Needlebarguidebracket
C
C
SetscrewⒶGuidepin
Cam
Hingedpin
CC-cross
section
AB
Screw
Needlebar
guidebracket
Rubbercushion
Smallneedle
barclamp
Needlebar
Eccentricbushing
Needlebarcrankrod
Rubberplug
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.
Notch
Notch
HOW TO USE
—15 —

L
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.
Arm
Redmarkpoint
Pulley
Blackmarkpoint
Reversesewinglever
Feedlength
settingdial
Forwardstitch
Backwardstitch
Feedcam
Feedconnectingrod Setscrew
Backwardstitchlengthincreases
Reversestitch
shaftcrank
Reverse
block
Eccentricpin
Markpoint
Screw Forwardstitchlengthincreases
HOW TO USE
—16 —

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).
Movableknife
Lugofinnerhook
Innerhook
Approx.0.5mm
ScrewⒶ
ScrewⒷ
Threadtrimmer
rockingcrank
BoltⒶ
Threadtrimmerrockingcrank
BoltⒷ
Pitmanrod
Threadtrimmercam
Camroller
Camfollowercrank
Movableknife
0to0.5mm
Fixedknife
HOW TO USE
—17 —