JUKI DSC-245 User manual

Copyright © 2012-2013 JUKI CORPORATION
• All rights reserved throughout the world.
Please do not hesitate to contact our distributors or agents in your area for further information when necessary.
＊The description covered in this instruction manual is subject to change for improvement of the
commodity without notice.
13 · 09 Printed in Japan
SEWING MACHINERY BUSINESS UNIT
2-11-1, TSURUMAKI, TAMA-SHI,
TOKYO, 206-8551, JAPAN
PHONE : [phone]
FAX : [phone]
http://www.juki.com
No.02
40092228
INSTRUCTION MANUAL
DSC-245,-4,-7
DSC-245V,-4,-7
NOTE : Read safety instructions carefully and understand them before using.
Retain this Instruction Manual for future reference.

日本語
日本語

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For the sewing machine, automatic machine and ancillary devices (hereinafter collectively referred to as
"machine"), it is inevitable to conduct sewing work near moving parts of the machine. This means that there
is always a possibility of unintentionally coming in contact with the moving parts. Operators who actually
operate the machine and maintenance personnel who are involved in maintenance and repair of the machine
are strongly recommended to carefully read to fully understand the following SAFETY PRECAUTIONS
before using/maintaining the machine. The content of the SAFETY PRECAUTIONS includes items which
are not contained in the specications of your product.
The risk indications are classied into the following three different categories to help understand the meaning
of the labels. Be sure to fully understand the following description and strictly observe the instructions.
Warning label
❶
❷
❸
❶•Thereisthepossibilitythatslighttoseriousinjuryordeathmaybecaused.
•Thereisthepossibilitythatinjurymaybecausedbytouchingmovingpart.
❷•Toperformsewingworkwithsafetyguard.
•Toperformsewingworkwithsafetycover.
•Toperformsewingworkwithsafetyprotectiondevice.
❸•BesuretoturnthepowerOFFbeforecarryingout"machine-headthreading",
"needlechanging","bobbinchanging"or"oilingandcleaning".
❸
❷
❶
Electrical-shock
dangerlabel
DANGER :
Thisindicationisgivenwherethereisanimmediatedangerofdeathorserousinjuryifthepersoninchargeoranythird
partymishandlesthemachineordoesnotavoidthedangeroussituationwhenoperatingormaintainingthemachine.
WARNING :
Thisindicationisgivenwherethereisapotentialityfordeathorseriousinjuryifthepersoninchargeoranythird
partymishandlesthemachineordoesnotavoidthedangeroussituationwhenoperatingormaintainingthemachine.
CAUTION :
Thisindicationisgivenwherethereisadangerofmediumtominorinjuryifthepersoninchargeoranythirdpar-
tymishandlesthemachineordoesnotavoidthedangeroussituationwhenoperatingormaintainingthemachine.
Itemsrequiringspecialattention.
Pictorialwarningindication
Thereisariskofinjuryifcontact-
ingamovingsection.
Pictorialwarning
indication
Beawarethatholdingthesewing
machineduringoperationcan
hurtyourhands.
Thereisariskofelectricalshockif
contactingahigh-voltagesection.
Thereisariskofentanglementin
thebeltresultingininjury.
Thereisariskofaburnifcontact-
ingahigh-temperaturesection.
Thereisariskofinjuryifyou
touchthebuttoncarrier.
Beawarethateyedeciencycan
becausedbylookingdirectlyatthe
laserbeam.
Indicationlabel
Thecorrectdirectionisindicated.
Thereisariskofcontactbetween
yourheadandthesewingma-
chine.
Connectionofaearthcableis
indicated.
TO ENSURE SAFE USE OF YOUR SEWING MACHINE
(I)Explanationofrisklevels
(II) Explanationofpictorialwarningindicationsandwarninglabels

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SAFETY PRECAUTIONS
 1. Whenitisnecessarytoopenthecontrolboxcontainingelectricalparts,besuretoturnthepower
offandwaitforveminutesormorebeforeopeningthecoverinordertopreventaccidentleadingto
electricalshock.
Accidentmeans"tocause
personalinjuryordeathor
damagetoproperty."
DANGER
CAUTION
Basicprecaution
 1. Besuretoreadtheinstructionmanualandotherexplanatorydocumentssuppliedwithaccessoriesof
themachinebeforeusingthemachine.Carefullykeeptheinstructionmanualandtheexplanatorydocu-
mentsathandforquickreference.
 2. Thecontentofthissectionincludesitemswhicharenotcontainedinthespecicationsofyourproduct.
 3. Besuretowearsafetygogglestoprotectagainstaccidentcausedbyneedlebreakage.
 4. Thosewhouseaheartpacerhavetousethemachineafterconsultationwithamedicalspecialist.
Safetydevicesandwarninglabels
 1. Besuretooperatethemachineafterverifyingthatsafetydevice(s)iscorrectlyinstalledinplaceand
worksnormallyinordertopreventaccidentcausedbylackofthedevice(s).
 2. Ifanyofthesafetydevicesisremoved,besuretoreplaceitandverifythatitworksnormallyinorderto
preventaccidentthatcanresultinpersonalinjuryordeath.
 3. Besuretokeepthewarninglabelsadheredonthemachineclearlyvisibleinordertopreventaccident
thatcanresultinpersonalinjuryordeath.Ifanyofthelabelshasstainedorcomeunstuck,besureto
changeitwithanewone.
Applicationandmodication
 1. Neverusethemachineforanyapplicationotherthanitsintendedoneandinanymannerotherthanthat
prescribedintheinstructionmanualinordertopreventaccidentthatcanresultinpersonalinjuryor
death.JUKIassumesnoresponsibilityfordamagesorpersonalinjuryordeathresultingfromtheuseof
themachineforanyapplicationotherthantheintendedone.
 2. Nevermodifyandalterthemachineinordertopreventaccidentthatcanresultinpersonalinjuryor
death.JUKIassumesnoresponsibilityfordamagesorpersonalinjuryordeathresultingfromthema-
chinewhichhasbeenmodiedoraltered.
Educationandtraining
 1. Inordertopreventaccidentresultingfromunfamiliaritywiththemachine,themachinehastobeused
onlybytheoperatorwhohasbeentrained/educatedbytheemployerwithrespecttothemachineoper-
ationandhowtooperatethemachinewithsafetytoacquireadequateknowledgeandoperationskill.To
ensuretheabove,theemployerhastoestablishaneducation/trainingplanfortheoperatorsandedu-
cate/trainthembeforehand.
Itemsforwhichthepowertothemachinehastobeturnedoff
Turningthepoweroff: Turningthepowerswitchoff,thenremovingthepowerplugfromtheoutlet.
Thisappliestothefollowing.
 1. Besuretoimmediatelyturnthepoweroffifanyabnormalityorfailureisfoundorinthecaseofpower
failureinordertoprotectagainstaccidentthatcanresultinpersonalinjuryordeath.
 2. Toprotectagainstaccidentresultingfromabruptstartofthemachine,besuretocarryoutthefollow-
ingoperationsafterturningthepoweroff.Forthemachineincorporatingaclutchmotor,inparticular,
besuretocarryoutthefollowingoperationsafterturningthepoweroffandverifyingthatthemachine
stopscompletely.
 2-1. Forexample,threadingthepartssuchastheneedle,looper,spreaderetc.whichhavetobethread-
ed,orchangingthebobbin.
 2-2. Forexample,changingoradjustingallcomponentpartsofthemachine.
 2-3. Forexample,wheninspecting,repairingorcleaningthemachineorleavingthemachine.
 3. Besuretoremovethepowerplugbyholdingtheplugsectioninsteadofthecordsectioninordertopre-
ventelectrical-shock,earth-leakageorreaccident.
 4. Besuretoturnthepoweroffwheneverthemachineisleftunattendedbetweenworks.
 5. Besuretoturnthepoweroffinthecaseofpowerfailureinordertopreventaccidentresultingofbreak-
ageofelectricalcomponents.
– 19 –
29.TROUBLES AND CORRECTIVE MEASURES
Trouble Cause Corrective measures
1.Thread breakage
(Thread frays or
wears out.)
①The thread path,needle point,hook point or bobbin
case positioning nger has scratches.
○ Remove the scratches on the hook point using a ne sand
paper. Buff the bobbin case positioning nger.
②The needle thread tension is too high. ○ Properly adjust the needle thread tension.
③The needle hits the hook point. ○ See "17.NEEDLE-TO-HOOK RELATIONSHIP".
④Lubrication to hook is inadequate. ○ Properly adjust the lubrication. See "4.LUBRICATION".
(Needle thread
remains 2 to 3 cm on
the wrong side of the
cloth.)
⑤The needle thread tension is too low. ○ Properly adjust the needle thread tension.
⑥The thread take-up spring has an excessively high
tension while it has an excessively small stroke.
○ Decrease the tension,and increase the stroke.
⑦The timing between the needle and hook is too
early or late.
○ See "17.NEEDLE-TO-HOOK RELATIONSHIP".
⑧The bobbin races frequently. ○ Increase the spring pressure. Alternatively,reduce the
thread trimming speed.
2.Stitch skipping ①The clearance between the needle and the hook
point is too large.
○ See "17.NEEDLE-TO-HOOK RELATIONSHIP".
②The timing between the needle and the hook point
is too early or late.
○ See "17.NEEDLE-TO-HOOK RELATIONSHIP".
③The presser foot pressure is too low. ○ Increase the presser foot pressure.
④The clearance between the top edge of the needle
eyelet and the hook point is not correct.
○ See "17.NEEDLE-TO-HOOK RELATIONSHIP".
⑤The size of the needle is wrong. ○ Replace the needle by one which is one
grade thicker.
⑥ A synthetic ber thread or thin thread is used. ○ Wind the thread round the needle as illustrat-
ed.
3.Loose stitches ①The thread has not been passed through the notch
of the bobbin case tension spring.
○ Properly thread the bobbin case.
② The thread path is poorly nished. ○ Grind it using a ne sand paper or a buff.
③The bobbin does not rotate smoothly. ○ Replace the bobbin or hook.
④The bobbin thread tension is too low. ○ Properly adjust the tension.
⑤The bobbin thread has been wound too tight. ○ Properly adjust the needle thread tension.
⑥An untwisted synthetic thread is used. ○ Slightly reduce the sewing speed.(2,000 sti/min)
⑦A coated cloth or nylon yarn is used. ○ Use a ball-point needle..
4.A few stitches are
skipped.
①The bobbin thread is too short. ○ Replace the bobbin by a standard one (aluminum).
②The bobbin thread breaks. ○ Decrease the bobbin thread tension and the thread trim-
ming speed.
③A nylon thread is used when sewing lightweight
material.
○ Use the soft start function.
5.The thread slips off ①The tension of the auxiliary thread tension ○ Decrease the tension.
②Thread take-up timing is too early. ○ See "21.ADJUSTING THE THREAD TRIMMING CAM".
③Returning force of the thread take-up spring is
excessively strong.
○ See "9.THREAD THE MACHINE HEAD". Replace the
thread guide with an appropriate one.
④The feed dog and walking foot trims thread. ○ Replace the walking foot with an appropriate one.
⑤Actuating quantity of the picker is inadequate. ○ See "24.ADJUSTING THE OPERATING STROKE OF
THE PICKER".
6.The needle thread
cannot be trimmed.
(The bobbin thread
can be trimmed.)
①The last stitch has been skipped.(The clearance
between the needle and the hook is too large.)
○ See "17.NEEDLE-TO-HOOK RELATIONSHIP".
7.Both needle and bob-
bin threads cannot be
trimmed.
①The thread trimming timing is wrong. ○ See "21.ADJUSTING THE THREAD TRIMMING TIMING".
②The knife has been damaged. ○ Replace the knife.
③The knife pressure is inadequate. ○ Increase the knife pressure.
④The movement of the rotary knife is short. ○ See "23.ADJUSTING MAX. MOVING POSITION OF THE
ROTARY KNIFE".
⑤The thread trimming solenoid fails to work. ○ Check the motor solenoid for proper operation.
8.Thread cannot be
trimmed sharply.
①The thread trimming timing is wrong. ○ See "22.ADJUSTING THE THREAD TRIMMING TIMING".
②The knife pressure is inadequate. ○ Increase the knife pressure.
③The knife blade is blunt. ○ Replace the knife.
9.Chain off thread
doesn't come out.
①Breakage due to thread frayed caused by standing
and apping of thread.
○ Use the furnished thread guide and the presser foot with a
slot.
②Breakage between the bottom face of the presser
foot and the contact face with throat plate.
10.Stepped part is
clogged.
①The presser foot slips when riding on the stepped
part.
○ Use B15242450AB presser foot (option) and B147024500B
walking foot (option).
11.When the alternate lift
is increased,the pitch
cannot be achieved
as per the scale.
①Sewing speed is too fast,resulting in reducing the
feed force.
○ Reduce the sewing speed.

– 18 –
1 . Use the 3-phase 400 W AC clutch motor.
2 . Use an M type V belt.
3 . The following table shows the relationship among the motor pulley and the sewing speed.
28.MOTOR PULLEY AND SEWING SPEED (DSC-245, DSC-245V)
Model Sewing speed Effective diameter
of handwheel
Number
of poles Frequency Rotational speed of motor
Effective diameter
of motor pulley
DSC-245
DSC-245V 2,200 sti/min ø76.0 4 50Hz 1430 rpm ø115
60Hz 1715 rpm ø95
(Caution)
The effective diameter of the motor pulley is obtained by subtracting 5 mm from the outside diameter.
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PRECAUTIONSTOBETAKENINVARIOUSOPERATIONSTAGES
Transportation
1. Besuretoliftandmovethemachineinasafemannertakingthemachineweightinconsideration.Refer
tothetextoftheinstructionmanualforthemassofthemachine.
2. Besuretotakesufcientsafetymeasurestopreventfallingordroppingbeforeliftingormovingthe
machineinordertoprotectagainstaccidentthatcanresultinpersonalinjuryordeath.
3. Oncethemachinehasbeenunpacked,neverre-packitfortransportationtoprotectthemachineagainst
breakageresultingfromunexpectedaccidentordropping.
Unpacking
1. Besuretounpackthemachineintheprescribedorderinordertopreventaccidentthatcanresultin
personalinjuryordeath.Inthecasethemachineiscrated,inparticular,besuretocarefullychecknails.
Thenailshavetoberemoved.
2. Besuretocheckthemachineforthepositionofitscenterofgravityandtakeitoutfromthepackage
carefullyinordertopreventaccidentthatcanresultinpersonalinjuryordeath.
Installation
(I)Tableandtablestand
1. BesuretouseJUKIgenuinetableandtablestandinordertopreventaccidentthatcanresultinper-
sonalinjuryordeath.IfitisinevitabletouseatableandtablestandwhicharenotJUKIgenuineones,
selectthetableandtablestandwhichareabletosupportthemachineweightandreactionforceduring
operation.
2. Ifcastersarettedtothetablestand,besuretousethecasterswithalockingmechanismandlock
themtosecurethemachineduringtheoperation,maintenance,inspectionandrepairinordertoprevent
accidentthatcanresultinpersonalinjuryordeath.
(II)Cableandwiring
1. Besuretopreventanextraforcefrombeingappliedtothecableduringtheuseinordertoprevent
electrical-shock,earth-leakageorreaccident.Inaddition,ifitisnecessarytocableneartheoperating
sectionsuchastheV-belt,besuretoprovideaspaceof30mmormorebetweentheoperatingsection
andthecable.
2. Besuretoavoidstarburstconnectioninordertopreventelectrical-shock,earth-leakageorreaccident.
3. Besuretosecurelyconnecttheconnectorsinordertopreventelectrical-shock,earth-leakageorre
accident.Inaddition,besuretoremovetheconnectorwhileholdingitsconnectorsection.
(III)Grounding
1. Besuretohaveanelectricalexpertinstallanappropriatepowerpluginordertopreventaccidentcaused
byearth-leakageordielectricstrengthvoltagefault.Inaddition,besuretoconnectthepowerplugtothe
groundedoutletwithoutexceptions.
2. Besuretogroundtheearthcableinordertopreventaccidentcausedbyearthleakage.
(IV)Motor
1. Besuretousethespeciedratedmotor(JUKIgenuineproduct)inordertopreventaccidentcausedby
burnout.
2. Ifacommerciallyavailableclutchmotorisusedwiththemachine,besuretoselectonewithanentan-
glementpreventivepulleycoverinordertoprotectagainstbeingentangledbytheV-belt.
Beforeoperation
1. Besuretomakesurethattheconnectorsandcablesarefreefromdamage,dropoutandloosenessbe-
foreturningthepoweroninordertopreventaccidentresultinginpersonalinjuryordeath.
2. Neverputyourhandintothemovingsectionsofthemachineinordertopreventaccidentthatcanresult
inpersonalinjuryordeath.
Inaddition,checktobesurethatthedirectionofrotationofthepulleyagreeswiththearrowshownon
pulley.
3. Ifthetablestandwithcastersisused,besuretosecurethetablestandbylockingthecastersorwith
adjusters,ifprovided,inordertoprotectagainstaccidentcausedbyabruptstartofthemachine.
Duringoperation
1. Besurenottoputyourngers,hairorclothingclosetothemovingsectionssuchasthehandwheel,
handpulleyandmotororplacesomethingnearthosesectionswhilethemachineisinoperationinorder
topreventaccidentcausedbyentanglementthatcanresultinpersonalinjuryordeath.
2. Besurenottoplaceyourngersnearthesurroundareaoftheneedleorinsidethethreadtake-uplever
coverwhenturningthepoweronorwhilethemachineisinoperationinordertopreventaccidentthat
canresultinpersonalinjuryordeath.
3. Themachinerunsatahighspeed.Neverbringyourhandsnearthemovingsectionssuchaslooper,
spreader,needlebar,hookandclothtrimmingknifeduringoperationinordertoprotectyourhands
againstinjury.Inaddition,besuretoturnthepoweroffandchecktobesurethatthemachinecomplete-
lystopsbeforechangingthethread.
4. Becarefulnottoallowyourngersoranyotherpartsofyourbodytobecaughtbetweenthemachine
andtablewhenremovingthemachinefromorreplacingitonthetableinordertopreventaccidentthat
canresultinpersonalinjuryordeath.

iv
iv
5. Besuretoturnthepoweroffandchecktobesurethatthemachineandmotorcompletelystopbeforere-
movingthebeltcoverandV-beltinordertopreventaccidentcausedbyabruptstartofthemachineormotor.
6. Ifaservomotorisusedwiththemachine,themotordoesnotproducenoisewhilethemachineisatrest.
Besurenottoforgettoturnthepoweroffinordertopreventaccidentcausedbyabruptstartofthemotor.
7. Neverusethemachinewiththecoolingopeningofthemotorpowerboxshieldedinordertopreventre
accidentbyoverheat.
Lubrication
1. BesuretouseJUKIgenuineoilandJUKIgenuinegreasetothepartstobelubricated.
2. Iftheoiladheresonyoureyeorbody,besuretoimmediatelywashitoffinordertopreventinamma-
tionorirritation.
3. Iftheoilisswallowedunintentionally,besuretoimmediatelyconsultamedicaldoctorinordertopre-
ventdiarrheaorvomiting.
Maintenance
1. Inpreventionofaccidentcausedbyunfamiliaritywiththemachine,repairandadjustmenthastobe
carriedoutbyaservicetechnicianwhoisthoroughlyfamiliarwiththemachinewithinthescopedened
intheinstructionmanual.BesuretouseJUKIgenuinepartswhenreplacinganyofthemachineparts.
JUKIassumesnoresponsibilityforanyaccidentcausedbyimproperrepairoradjustmentortheuseof
anypartotherthanJUKIgenuineone.
2. Inpreventionofaccidentcausedbyunfamiliaritywiththemachineorelectrical-shockaccident,besure
toaskanelectricaltechnicianofyourcompanyorJUKIordistributorinyourareaforrepairandmainte-
nance(includingwiring)ofelectricalcomponents.
3. Whencarryingoutrepairormaintenanceofthemachinewhichusesair-drivenpartssuchasanaircyl-
inder,besuretoremovetheairsupplypipetoexpelairremaininginthemachinebeforehand,inorderto
preventaccidentcausedbyabruptstartoftheair-drivenparts.
4. Besuretocheckthatscrewsandnutsarefreefromloosenessaftercompletionofrepair,adjustment
andpartreplacement.
5. Besuretoperiodicallycleanupthemachineduringitsdurationofuse.Besuretoturnthepoweroff
andverifythatthemachineandmotorstopcompletelybeforecleaningthemachineinordertoprevent
accidentcausedbyabruptstartofthemachineormotor.
6. Besuretoturnthepoweroffandverifythatthemachineandmotorstopcompletelybeforecarryingout
maintenance,inspectionorrepairofthemachine.(Forthemachinewithaclutchmotor,themotorwill
keeprunningforawhilebyinertiaevenafterturningthepoweroff.So,becareful.)
7. Ifthemachinecannotbenormallyoperatedafterrepairoradjustment,immediatelystopoperationand
contactJUKIorthedistributorinyourareaforrepairinordertopreventaccidentthatcanresultinper-
sonalinjuryordeath.
8. Ifthefusehasblown,besuretoturnthepoweroffandeliminatethecauseofblowingofthefuseand
replacetheblownfusewithanewoneinordertopreventaccidentthatcanresultinpersonalinjuryor
death.
9. Besuretoperiodicallycleanuptheairventofthefanandinspecttheareaaroundthewiringinorderto
preventreaccidentofthemotor.
Operatingenvironment
1. Besuretousethemachineundertheenvironmentwhichisnotaffectedbystrongnoisesource(electro-
magneticwaves)suchasahigh-frequencywelderinordertopreventaccidentcausedbymalfunctionof
themachine.
2. Neveroperatethemachineinanyplacewherethevoltageuctuatesbymorethan"ratedvoltage±10%"
inordertopreventaccidentcausedbymalfunctionofthemachine.
3. Besuretoverifythattheair-drivendevicesuchasanaircylinderoperatesatthespeciedairpressure
beforeusingitinordertopreventaccidentcausedbymalfunctionofthemachine.
4. Tousethemachinewithsafety,besuretouseitundertheenvironmentwhichsatisesthefollowing
conditions:
Ambienttemperatureduringoperation 5°Cto35°C
Relativehumidityduringoperation 35%to85%
5. Dewcondensationcanoccurifbringingthemachinesuddenlyfromacoldenvironmenttoawarmone.
So,besuretoturnthepoweronafterhavingwaitedforasufcientperiodoftimeuntilthereisnosign
ofwaterdropletinordertopreventaccidentcausedbybreakageormalfunctionoftheelectricalcompo-
nents.
6. Besuretostopoperationwhenlightningashesforthesakeofsafetyandremovethepowerplugin
ordertopreventaccidentcausedbybreakageormalfunctionoftheelectricalcomponents.
7. Dependingontheradiowavesignalcondition,themachinemaygeneratenoiseintheTVorradio.Ifthis
occurs,usetheTVorradiowithkeptwellawayfromthemachine.
8. Inordertoensuretheworkenvironment,locallawsandregulationsinthecountrywherethesewing
machineisinstalledshallbefollowed.
Inthecasethenoisecontrolisnecessary,anearprotectororotherprotectivegearshouldbewornac-
cordingtotheapplicablelawsandregulations.
9. Disposalofproductsandpackagesandtreatmentofusedlubricatingoilshouldbecarriedoutproperly
accordingtotherelevantlawsofthecountryinwhichthesewingmachineisused.
– 17 –
2. Installation process
1) Fit spring 󱣍over screw 󱣌. In this state, x
feed bar hinge stud 󱢽.
2) Attach feed driving pin 󱣋in place.
3) Attach feed bar block A 󱣊on feed bar oscil-
lating arm 󱢼.
4) Attach feed bar block shaft 󱣇on feed bar 󱢺.
5) Attach feed bar block B 󱣉in feed bar block
shaft 󱣇using E ring 󱣈.
6) Attach feed 󱣆on feed bar 󱢺with feed set-
screw 󱢻.
7) Attach feed bar block shaft 󱣇and feed bar 󱢺
on which feed 󱣆has been attached in place
on feed bar hinge stud 󱢽.
8) Install spring support shaft 󱢹in place.
9) Tighten feed setscrew 󱢻to allow the needle
to come just at the center of the needle hole
in the feed 󱣆.
10) Top cover spring 󱣅of the bed,feed bar shaft
cover 󱢸and screw 󱢷of the feed bar shaft
cover 󱢸in place.
11) Fix top cover 󱣄of the bed by tightening
screw 󱣃in the top cover of the bed.
12) Attach throat plate 󱣂 in place and x it using
screw 󱣁of the throat plate.
13) Install presser foot (asm.) 󱢿and walking foot
󱣀in place.
(Caution)
1．The parts attached with an asterisk ( * ) are the exclusive parts for the DSC-245V-4 or -7.
2．The feed driving pin has engraved marker lines. Use the pin which has many marker lines to raise the feed dog,or
use the pin with less marker lines to lower it.
Note No. Part No. Part Name Q'ty Remarks
22 B15242450A0 Presser foot (asm.) 1
23 B1470245000 Walking foot 1
24 SS2110915SP Screw in throat plate 2 11/64 40 thread ridges, L=8.5
25 B1105245000 Throat plate 1
* D1105245E00 Throat plate 1
26 SS2090710TP Screw in top cover of bed 1 9/64 40 thread ridges, L=7
27 B1173245000 Top cover of bed 1
* D1173245E00 Top cover of bed 1
28 B1175245000 Spring of top cover of bed 1
29 B1613245000 Feed 1
* D1613245E0A Feed 1
30 B1645245000 Feed bar block 1
31 RE0300000K0 E ring 1
32 B1644245000 Feed bar block B 1
33 B1643145000 Feed bar block A 1
34 B163224500C Feed driving pin 1 Selective part (caution 2)
35 B1641245000 Feed bar hinge stud screw 2
36 B1642245000 Feed bar hinge stud screw spring 2
List of parts to be replaced
Part No. B163224500A B163224500B B163224500C B163224500D B163224500E
Length(mm) 5.7±0.05 5.9±0.05 6.1±0.05 6.3±0.05 6.5±0.05
Number of marker lines 1 2 3 4 5

– 16 –
27.HOW TO CHANGE FROM HORIZONTAL FEED TO ELLIPTICAL FEED
(Caution) 1．The parts attached with an asterisk(*) are the exclusive parts for the DSC-245V-4 or 7.
2．★marks mean the parts used succeedingly after replacement.
1. Removing process
1) Remove presser foot (asm.) 󱢵and walking
foot 󱢶.
2) Loosen throat plate setscrew 󱢴and remove
throat plate 󱢳.
3) Loosen screw 󱢷in the feed bar shaft cov-
er,and remove top cover ❹of the bed,top
cover spring ❾of the bed and cover 󱢸of
feed bar shaft.
4) Remove the feed unit with tape guide
❼,screw ❽in the tape guide,screws ❺in
the binder and nuts ❻of the screws in the
binder attached on top cover ❹of the bed.
5) Remove spring support shaft 󱢹.
6) Remove feed bar 󱢺.(At this time,it should
be removed with feed ❸,feed bar block
shaft ❷attached in place.)
7) Remove feed bar block ❶from feed bar
oscillating arm 󱢼.
8) Remove feed bar block shaft
❷
from feed bar
󱢺
.
9) Loosen screws 󱢻in the feed,and remove
feed ❸.
10) Remove feed bar stud 󱢽,screw 󱢾.
This model can be changed to elliptical feed by changing the related parts accordingly.
List of parts to be replaced
Note No. Part No. Part Name Q'ty Remarks
1 MAQ09210000 Feed bar block 1
2 MAQ09211000 Feed bar block shaft 1
* MAQ09411000 Feed bar block shaft 1
3 MAN10451000 Feed 1
* 21305206 Feed 1
4 MAQ09202000 Top cover of bed 1
* MAQ09402000 Top cover of bed 1
5 MAQ09204000 Screw in binder 2 11/64 40 thread ridges
6 MAQ09205000 Nut of screw in binder 2 11/64 40 thread ridges
7 MAQ09206000 Tape guide 1
8 SS7110510SP Screw in tape guide 1 11/64 40 thread ridges, L=5
9 MAQ09203000 Spring of top cover of bed 1
* 10 MAQ09201000 Throat plate 1
MAQ09401000 Throat plate 1
11 SS2110930SP Screw in throat plate 2 11/64 40 thread ridges, L=8.5
12 MAQ093080A0 Presser foot (asm.) 1
★13 MAN10452000 Walking foot 1
★14 B1653245000
Screw in the feed bar shaft cover 1 9/64 40 thread ridges, L=10
★15 B1640245000 Cover of feed bar shaft 1
★16 B1638245000 Spring support shaft 1
★17 D1606245E00 Feed bar 1
★18 B1652245000 Screw in feed 2 1/8 44 thread ridges, L=3.7
19 B1603245000 Feed bar oscillating arm 1
20 B1639245000 Feed bar hinge stud 1
21 SS7110910SP Feed bar hinge stud screw 2
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
v
CAUTION :
Note that safety devices such as “eye guard”, “nger guard”, etc. may be omitted from the
illustrations in this Instruction Manual for easy explanation.
When operating the machine, be sure not to remove these safety devices.
1. For the safety, never operate the sewing machine with the ground wire for the
power supply removed.
2. Be sure to turn OFF the power switch in prior when connecting/disconnecting the
power plug.
3. When thunders occurs, stop the work for the safety and disconnect the power plug.
4. When the sewing machine is suddenly moved from a cold place to a warm place,
there is a case where dew condensation may occur. Turn ON the power after there
is no worry of the drop of water.
5. To prevent res, periodically draw out the power plug from the plug socket and
clean the root of the pins and the space between pins.
6. The hook rotates at a high speed while the machine is in operation.
To prevent possible injury to hands, be sure to keep your hands away from the
vicinity of the hook during operation. In addition, be sure to turn OFF the power to
the machine when replacing the bobbin.
7. To avoid possible accidents due to abrupt start of the machine, be sure to turn OFF
the power to the machine.
8. Be careful of handling this product so as not to pour water or oil, shock by dropping,
and the like since this product is a precision instrument.
9. When tilting or returning the sewing machine to the home position, hold the upper
side of the machine head with both hands and perform the work quietly so that
ngers or the like are not caught in the machine.
1. To avoid personal injury, never put your ngers under the needle when you turn ON
the power switch or operate the sewing machine.
2. To avoid personal injury, never put your ngers into the thread take-up cover while
the sewing machine is in operation.
3. Turn OFF the power switch when tilting the machine head, or removing the belt
cover or the V belts.
4. To prevent possible personal injury caused by being caught in the machine, keep
your ngers, head and clothes away from the handwheel and the thread take-up
while the sewing machine is in operation. In addition, place nothing around it.
5. To avoid personal injury, never operate the sewing machine with the nger guard
removed.
6. To avoid personal injury, be careful not to allow your ngers in the machine when
tilting the machine head.
Precautions to be taken so as to use
the DSC-245,-4,-7,DSC-245V,-4,-7 more safely

vi
BEFORE OPERATION
• Before you put the machine into operation for the rst time after the set-up, clean it thoroughly .
Remove all dust gathering during transportation and oil it well.
• Conrm that voltage has been correctly set.
Conrm that the power plug has been properly connected to the power supply.
• Never use the machine in the state where the voltage type is different from the designated one.
• The direction of normal rotation of the machine is counterclockwise as observed from the
pulley side.
Take care not to allow the machine to rotate in the reverse direction.
• Never operate the machine unless the machine head and the oil tank have been lled with oil.
• For a test run, remove the bobbin and the needle thread.
• For the rst month, decrease the sewing speed and run the sewing machine at a speed of 2,000 sti/
min or less.
• When carrying the machine, do not hold it by the synchronizer located at the rear of the
handwheel.
• Operate the handwheel after the machine has totally stopped.
• Observe the standard thread trimming speed, 185 sti/min.
CAUTION :
Check the following so as to prevent maloperation of and damage to the machine.
– 15 –
Note No. Part No. Part Name Q'ty Remarks
20 MAQ09210000 Feed bar block 1
21 MAQ09211000 Feed bar block hinge stud 1
*
MAQ09411000 Feed bar block hinge stud 1
22 MAQ09209000 Feed 1 For attaching a narrow tape
MAQ09309000 Feed 1 For attaching a broad tape
*
MAQ09409000 Feed 1 For attaching a narrow tape
*
MAQ09509000 Feed 1 For attaching a broad tape
23 MAQ09202000 Bed top cover 1
*
MAQ09402000 Bed top cover 1
24 MAQ09204000 Binder setscrew 2 11/64 threads 40
25 MAQ09205000 Binder lock nut 2 11/64 threads 40
26 MAQ09206000 Tape guide 1
27 SS7110510SP Tape guide setscrew 1 11/64 threads 40, L=5
28 MAQ09203000 Bed top cover spring 1
29 MAQ09201000 Throat plate 1
*
MAQ09401000 Throat plate 1
30 SS2110930SP Throat plate setscrew 2 11/64 threads 40, L=8.5
31 MAQ092080A0 Presser foot (asm.) 1 For attaching a narrow tape
MAQ093080A0 Presser foot (asm.) 1 For attaching a broad tape
32 MAQ09207000 Walking foot 1 For attaching a narrow tape
MAQ09307000 Walking foot 1 For attaching a broad tape
List of parts to be replaced
2. Installation process
1) Install feed bar block 󱢽on feed bar rocker
arm 󱢻.
2) Install feed bar block hinge stud 󱢾on feed
bar 󱢴.
3) Temporarily install feed 󱢿on feed bar 󱢴.
4) Install feed bar 󱢴on which feed bar block
hinge stud 󱢾and feed 󱢿have been mount-
ed.
5) Install spring support shaft 󱢳.
6) Tighten feed 󱢿so that the needle locates in
the center of needle hole.
7) Screw binder setscrew 󱣁into bed top cover
󱣀.At this time,install binder setscrew 󱣁
after applying adhesive to it.
8) Screw binder lock nut 󱣂into binder setscrew
󱣁.
9) Install tape guide 󱣃on bed top cover 󱣀by
tape guide setscrew 󱣄.
10) After performing 7), 8) and 9), install bed top
cover 󱣀.
11) After installing bed top cover spring 󱣅and
feed bar hinge stud cap ❾,tighten feed bar
hinge stud cap screw ❻.
12) Install throat plate 󱣆 and x it by throat set-
screw 󱣇.
13) Install presser foot (asm.) 󱣈and walking
foot 󱣉.
(Caution) The parts attached with an asterisk(*) are the exclusive parts for the DSC-245-4 or 7.

– 14 –
26.HOW TO CHANGE FROM ELLIPTICAL FEED TO HORIZONTAL FEED
(Caution) 1．The parts attached with an asterisk(*) are the exclusive parts for the DSC-245-4 or 7.
2．★marks mean the parts used succeedingly after replacement.
1. Removing process
1)
Remove presser foot ❶and walking foot ❷.
2) Loosen throat plate setscrew ❸and re-
move throat plate
❹
.
3) Loosen setscrew ❺and cap screw ❻,and
remove bed top cover ❼,bed top cover
spring ❽and feed bar hinge stud cap ❾.
4) Remove spring support shaft
󱢳
.
5) Remove feed bar
󱢴
.(At this time,remove
it with feed
󱢵
and feed bar hinge stud
󱢶
,
etc. mounted.)
6) Remove setscrew
󱢷
to remove feed
󱢵
from feed bar
󱢴
.
7) Remove E ring
󱢸
,and remove feed bar
block B
󱢹
from feed bar hinge stud
󱢶
.
8) Loosen feed bar hinge stud
󱢶
and remove
it from feed bar
󱢴
.
9) Remove feed bar block A
󱢺
from feed
bar rocker arm 󱢻.(it is unnecessary to
remove 󱢻.)
10) Remove upper/lower feed pin 󱢼.
This model can be changed to horizontal feed suitable for attaching tapes by replacing parts.
Note No. Part No. Part Name Q'ty Remarks
1 B15242450A0 Presser foot (asm.) 1
2
B1470245000 Walking foot 1
3
SS2110915SP Throat plate setscrew 2 11/64 threads 40, L=8.5
4 B1105245000 Throat plate 1
*
D1105245E00 Throat plate 1
5
SS2090710TP Bed top cover setscrew 1 9/64 threads 40, L=7
★6
B1653245000 Feed bar cap screw 1 9/64 threads 40, L=10
7 B1173245000 Bed top cover 1
*
D1173245E00 Bed top cover 1
8
B1175245000 Bed top cover spring 1
★9
B1640245000 Feed bar hinge stud cap 1
★10
B1638245000 Spring support shaft 1
★11
D1606245E00 Feed bar 1
12
B1613245000 Feed 1
*
D1613245E0A Feed
13 B1645245000 Feed bar block hinge stud 1
★14
B1652245000 Feed bar setscrew 2 1/8 threads 44, L=3.7
15 RE0300000K0 E ring 1
16
B1644245000 Feed bar block B 1
17
D1643245000 Feed bar block A 1
★18
B1603245000 Feed bar rocker arm 1
19
B163224500C Upper/lower feed pin 1
List of parts to be replaced
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
vii
ENGLISH
ENGLISH
DECLARATION OF INCORPORATION OF PARTLY COMPLETED MACHINERY
We hereby declare that the sewing machine (sewing head) described below ;
1. Must not be put into service until the machinery to which it is incorporated has been declared in
conformity with the provisions of the Directive 2006/42/EC, and
2. Conforms to the essential requirements of the Directive 2006/42/EC, described in the technical
documentation, and
3. To be prepared with the above technical documentation compiled in accordance with part B of
Annex VII, and
4. Also to conform to the RoHS Directive 2011/65/EU
5. Relevant information on which should be transmitted in response to a reasoned request by the
national authorities, by the electronic method or other according to the request.
Applied harmonized standards, in particular :
EN ISO12100, EN ISO10821, EN 50581
Manufacturer :
JUKI CORPORATION
2-11-1, Tsurumaki, Tama-shi, Tokyo, Japan
Model
Description Industrial Sewing Machine
Function make stitches and sew
DSC-240 Series

viii
CONTENTS
SPECIFICATIONS........................................................................................................................ 1
1.SETTING UP THE SEWING MACHINE ................................................................................... 2
2.INSTALLING THE THREAD STAND........................................................................................ 2
3.INSTALLING THE BELT COVER AND THE BOBBIN WINDER ............................................. 3
4.LUBRICATION .......................................................................................................................... 3
5.ATTACHING THE NEEDLE ...................................................................................................... 4
6.WINDING A BOBBIN ................................................................................................................ 4
7.THREADING THE BOBBIN CASE........................................................................................... 5
8.INSTALLING THE TAKE-UP THREAD GUIDE ROD............................................................... 5
9.THREAD THE MACHINE HEAD .............................................................................................. 6
10.ADJUSTING THE STITCH LENGTH...................................................................................... 6
11.FORWARD/REVERSE SEAM RATIO..................................................................................... 6
12.THREAD TENSION................................................................................................................. 7
13.THREAD TAKE-UP SPRING .................................................................................................. 7
14.PRESSURES OF THE PRESSER FOOT AND WALKING FOOT ......................................... 7
15.HEIGHT OF THE FEED DOG (DSC-245,-4,-7) ...................................................................... 8
16.ADJUSTING THE WALKING FOOT AND THE PRESSER FOOT ........................................ 9
17.NEEDLE-TO-HOOKRELATIONSHIP ................................................................................... 10
18.AUXILIARY THREAD TENSION CONTROLLER (DSC-245-4,-7, DSC-245V-4,-7) ............ 10
19.ADJUSTING THE PRESSURE OF THE FIXED KNIFE (DSC-245-4,-7, DSC-245V-4,-7) ... 11
20.ONE-TOUCH TYPE REVERSE FEED STITCHING MECHANISM
(DSC-245-4,-7, DSC-245V-4,-7)............................................................................................ 11
21.ADJUSTING THE THREAD TRIMMING CAM ..................................................................... 12
22.ADJUSTING THE CAM ROLLER ARM AND THE CAM ROLLER ARM PRESSER
(DSC-245-4,-7, DSC-245V-4,-7)............................................................................................ 12
23.ADJUSTING MAX MOVING STROKE OF THE ROTARY KNIFE
(DSC-245-4,-7, DSC-245V-4,-7)............................................................................................ 12
24.ADJUSTING THE OPERATING STROKE OF THE PICKER
(DSC-245-4,-7, DSC-245V-4,-7)............................................................................................ 13
25.HOW TO REPLACE THE KNIVES (DSC-245-4,-7, DSC-245V-4,-7) ................................... 13
26.HOW TO CHANGE FROM ELLIPTICAL FEED TO HORIZONTAL FEED .......................... 14
27.HOW TO CHANGE FROM HORIZONTAL FEED TO ELLIPTICAL FEED .......................... 16
28.MOTOR PULLEY AND SEWING SPEED (DSC-245, DSC-245V) ....................................... 18
29.TROUBLES AND CORRECTIVE MEASURES .................................................................... 19
– 13 –
24.ADJUSTING THE OPERATING STROKE OF THE PICKER (DSC-245-4,-7, DSC-245V-4,-7)
25.HOW TO REPLACE THE KNIVES (DSC-245-4,-7, DSC-245V-4,-7)
1.Turning the handwheel, align the red marker dot in
the machine arm with the white marker dot in the
handwheel.
2.Loosen setscrew
❶
in the picker driving plate and
push picker driving plate
❷
by hand.
3.Adjust the position of the picker driving plate so that
picker
❸
operates 2 mm longer from the end face of
hook cover
❹
.
4.After adjustment,tighten the setscrew.
○ When the clearance between the picker driving bar
❺
and the picker driving plate is large,the operating
stroke decreases,and when it is small,the operating
stroke increases.
1.Remove the throat plate and the feed dog.
2.Rotary knife ❶can be removed by removing con-
necting screw ❸in driving plate ❷, and xed knife
❹can be done by removing setscrew ❺ of the xed
knife.
3.After replacement,adjust the knife pressure.
(Method for adjusting the knife pressure,see「19.
ADJUSTUING THE PRESSURE OF THE FIXED
KNIFE」）
(Caution)
Attach the counter knife so that it is in parallel to
the throat plate base.
すき間
Clearance
(When operating)
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Parallel