Sewing machines
Singer 306K Service — Service manual
Service manual for Singer 306K Service. 174 pages in English. Read the original PDF, download or print a copy without registration.
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- Singer
- Model / document
- Singer 306K Service
- Document type
- Service manual
- Language
- English
- Pages
- 174
- File size
- 22.8 MB
- Category
- Sewing machines
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- Not specified in catalog
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FormForm 2073220732
PrinterPrinter inin llll SS AA
SERVICESERVICE MANUALMANUAL
FORFOR
SINGERSINGER
SWING-NEEDLESWING-NEEDLE
SEWINGSEWING MACHINESMACHINES
FORFOR COMBINEDCOMBINED STRAIGHTSTRAIGHT ANDAND ZIGZAGZIGZAG STITCHINGSTITCHING
REVERSIBLEREVERSIBLE FEEDFEED
"SINGER"SINGER SS
MachineMachine 306w25306w25
SeeSee IndexIndex onon pagespages 169169 toto 174174
THETHE SINGERSINGER MANUFACTURINGMANUFACTURING COMPANYCOMPANY
*A*A TrademarkTrademark ofof THETHE SINGERSINGER MANUFACTURINGMANUFACTURING COMPANYCOMPANY
InsertInsert inin placeplace ofof CorrespondingCorresponding SheetSheet inin FormForm 2073220732 (257)(257)View original page 1Page 2 · Read text
PROPERTYPROPERTY OFOF
THETHE SINGERSINGER MANUFACTURINGMANUFACTURING COMPANYCOMPANY
ThisThis isis aa privateprivate andand confidentialconfidential communicationcommunication toto andand forfor thethe useuse ofof onlyonly
thethe employeesemployees ofof TheThe SingerSinger ManufacturingManufacturing CompanyCompany andand itsits affiliatedaffiliated com-com-
panies.panies. Reproduction,Reproduction, sale,sale, distribution,distribution, oror publicationpublication thereofthereof toto thethe publicpublic
isis forbidden.forbidden.View original page 2Page 3 · Read text
TABLETABLE OFOF CONTENTSCONTENTS
PacePace
SINGERSINGER AutomaticAutomatic Swing-NeedleSwing-Needle SewingSewing MachinesMachines ................ 33 toto 7979
SINGERSINGER Non-AutomaticNon-Automatic Swing-NeedleSwing-Needle SewingSewing MachinesMachines ofof ClassClass 306306 andand
MachineMachine 206K43206K43 8181 toto 8585
SINGERSINGER Non-AutomaticNon-Automatic Swing-NeedleSwing-Needle SewingSewing MachineMachine 206K25206K25 8787 toto 102102
SINGERSINGER AutomaticAutomatic Swing-NeedleSwing-Needle SewingSewing MachinesMachines ofof ClassClass 319319 ..103..103 toto 123123
SINGERSINGER AutomaticAutomatic Swing-NeedleSwing-Needle SewingSewing MachinesMachines ofof ClassClass 401401 ..125..125 toto 162162
DescriptionsDescriptions ofof MachinesMachines ............ ....163....163 toto 168168
IndexIndex 169169 toto 174174
SINGERSINGER AUTOMATICAUTOMATIC SWING-NEEDLESWING-NEEDLE
MACHINESMACHINES
TheThe instructionsinstructions onon thethe followingfollowing pages,pages, upuptotoandandinclud-includ
inging pagepage 79,79, applyapply toto 306306 AutomaticAutomatic Swing-Swing- NeedleNeedle Machines.Machines.View original page 3Page 4 · Read text
TiPSTiPS ONON SETTINGSETTING UPUP
AfterAfter removingremoving thethe machinemachine fromfrom itsits packingpacking case,case, 6.6. ByBy meansmeans ofof anan oiloil cancan filledfilled withwith Varsol,Varsol,
setset itit upup inin thethe orderorder notednoted below.below. floodflood thethe sewingsewing hookhook assembly.assembly. RunRun ma-ma-
chinechine forfor aboutabout threethree toto fivefive minutesminutes untiluntil 1.1. InspectInspect forfor concealedconcealed damagedamage incurredincurred
allall thethe tackytacky oiloil isis washedwashed out.out. ThenThen ap-ap- duringduring transit,transit, typicaltypical formsforms ofof whichwhich areare
plyply SINGERSINGER OilOil andand run-inrun-in thethe machinemachine asas follows:follows:
againagain forfor threethree toto fivefive minutes.minutes.
BentBent armarm shaft.shaft.
BrokenBroken oror bentbent handhand wheel.wheel. 7.7. OilOil thethe sewingsewing machinemachine completely.completely. SeeSee pagespages
7474 toto 77.77. WipeWipe awayaway allall surplussurplus oil.oil. CrackedCracked oror bentbent bed.bed.
NoisyNoisy gearsgears (high(high pitchedpitched whiningwhining geargear tonetone asas 8.8. MakeMake suresure therethere isis heatheat expansionexpansion clearanceclearance
wellwell asas geargear growl)growl) causedcaused byby severesevere shock.shock. .015.015 toto .020.020 inchinch betweenbetween rearrear armarm shaftshaft bush-bush-
MachineMachine boundbound tighttight byby severesevere shock.shock. inging andand flangedflanged bushing.bushing. SeeSee pagepage 27.27.
BrokenBroken oror bentbent under-bedunder-bed parts.parts.
9.9. InspectInspect conditioncondition ofof needleneedle beforebefore makingmaking sew-sew-
BrokenBroken oror crackedcracked motormotor endend covers,covers, lightlight andand inging test.test. SeeSee pagepage 5.5. CheckCheck hookhook andand needleneedle
pulley.pulley. relationship.relationship.
BrokenBroken oror bentbent stitchstitch regulatorregulator lever.lever.
10.10. Sew-inSew-in thethe machinemachine andand checkcheck thethe stitchingstitching forfor WaterWater damagedamage (observe(observe forfor waterwater marksmarks insideinside
correctcorrect behaviorbehavior ofof bightbight controlscontrols andand pendulumpendulum carton).carton).
motion.motion. SeeSee pagespages 5252 toto 55.55.
2.2. TurnTurn handhand wheelwheel overover towardtoward youyou toto makemake cer-cer-
taintain thatthat sewingsewing mechanismmechanism turnsturns freely.freely. 11.11. MakeMake suresure stitchstitch regulatorregulator movesmoves freely;freely; thatthat itit
doesdoes notnot creepcreep whenwhen sewingsewing oror thatthat itit stickssticks oror
3.3. WipeWipe offoff allall tracestraces ofof thethe tackytacky anti-rustanti-rust oiloil usedused binds.binds.
toto protectprotect thethe polishedpolished andand platedplated surfaces.surfaces.
GiveGive particularparticular attentionattention toto thethe needleneedle threadthread 12.12. TestTest windwind aa bobbinbobbin toto bebe suresure thatthat bobbinbobbin windswinds
tensiontension assembly.assembly. evenly.evenly.
4.4. ApplyApply motormotor andand lightlight toto machinemachine andand checkcheck 13.13. CheckCheck bobbinbobbin casecase tensiontension withwith silksilk asas describeddescribed
operatingoperating behavior.behavior. onon pagepage 21.21.
5.5. RemoveRemove bobbinbobbin casecase andand washwash inin Varsol,Varsol, mak-mak- 14.14. PolishPolish thethe headhead toto aa satinsatin finish.finish. DoDo notnot leaveleave
inging suresure allall tracestraces ofof tackytacky oiloil havehave beenbeen anan oilyoily oror aa greasygreasy filmfilm onon anyany portionportion ofof
washedwashed outout fromfrom underunder thethe tensiontension spring.spring. thethe headhead oror thethe cabinet.cabinet.View original page 4Page 5 · Read text
ORDERORDER OFOF INSPECTIONINSPECTION OFOF CUSTOMER'SCUSTOMER'S
)) MACHINESMACHINES ATAT THETHE BENCHBENCH
1.1. ObtainObtain completecomplete informationinformation concerningconcerning thethe 7.7. CheckCheck relationshiprelationship ofof needleneedle withwith sewingsewing hook.hook.
customer'scustomer's sewingsewing problemproblem beforebefore makingmaking anyany SeeSee pagespages 99 andand 4141 toto 44.44.
adjustments.adjustments.
8.8. CheckCheck pendulumpendulum motionmotion ofof needleneedle bar.bar. SeeSee
2.2. ObtainObtain samplessamples ofof thethe customer'scustomer's materialmaterial andand
pagespages 5252 toto 55.55.
threadthread forfor finalfinal testing.testing.
3.3. CheckCheck threadingthreading ofof machine.machine. 9.9. InspectInspect hookhook timingtiming atat centralcentral positionposition ofof needle.needle.
SeeSee pagepage 43.43.
4.4. InspectInspect needleneedle for-for-
10.10. CheckCheck needleneedle barbar heightheight atat extremeextreme leftleft needleneedle a.a. Make.Make. AllAll SINGERSINGER needlesneedles areare markedmarked withwith
position.position. SeeSee pagepage 44.44. thethe Company'sCompany's trademarktrademark SIMANCOSIMANCO **
b.b. ComparisonComparison ofof sizesize withwith thethe threadthread used.used.
11.11. CheckCheck feedfeed mechanismmechanism for-for-
SeeSee pagepage 10.10.
a.a. TimingTiming ofof feedfeed movement.movement. SeeSee pagepage 29.29.
c.c. DamageDamage (Needle(Needle bentbent oror blunt-needleblunt-needle eyeeye
rough.)rough.) b.b. FeedFeed dogdog height.height. SeeSee pagepage 30.30.
d.d. RelationRelation toto needleneedle holehole inin throatthroat plate.plate. CheckCheck c.c. PositionPosition ofof feedfeed dogdog inin throatthroat plateplate slots.slots.
forfor straightstraight sewingsewing andand forfor maximummaximum zigzagzigzag SeeSee pagepage 32.32.
stitching.stitching. SeeSee pagespages 2222 andand 52.52.
d.d. TestTest feedfeed forfor slightslight forwardforward motionmotion atat "O',"O',
5.5. CheckCheck conditioncondition ofof needleneedle holehole (or(or slot)slot) inin
presserpresser footfoot andand inin throatthroat plate.plate. 12.12. TestTest bightbight controls,controls, usingusing needleneedle perforationperforation
tests.tests. SeeSee pagespages 5858 andand 59.59.
6.6. CheckCheck threadthread clearanceclearance betweenbetween positionposition fingerfinger
andand bobbinbobbin casecase holder.holder. SeeSee pagepage 4242 13.13. CheckCheck armarm shaftshaft connectionconnection beltbelt forfor looseness.looseness.
55
InsertInsert inin placeplace ofof pagepage 55 inin FormForm 2073220732 (257'(257'View original page 5Page 6 · Read text
SUGGESTIONSSUGGESTIONS TOTO THETHE SERVICEMANSERVICEMAN ININ THETHE NOMENOME
QuiteQuite frequently,frequently, whenwhen aa machinemachine isis notnot sewingsewing c.c. locationlocation in:in:
satisfactorily,satisfactorily, thethe requiredrequired adjustmentsadjustments cancan bebe accom-accom- throatthroat plateplate
plishedplished inin thethe homehome byby aa SINGERSINGER Serviceman.Serviceman. presserpresser footfoot
relationrelation toto sewingsewing hookhook pointpoint
ConditionsConditions suchsuch asas faultyfaulty operationoperation ofof thethe bightbight
d.d. damagedamage fromfrom strikingstriking hookhook pointpoint
controlcontrol oror wornworn oror damageddamaged partsparts maymay havehave toto bebe
remediedremedied atat thethe SINGERSINGER Shop,Shop, butbut thisthis decisiondecision shouldshould 4.4. CheckCheck threadingthreading ofof machine,machine, bothboth upperupper andand
bebe mademade onlyonly afterafter thethe machinemachine isis thoroughlythoroughly checkedchecked underunder threads.threads.
inin thethe exactexact orderorder outlinedoutlined below.below.
5.5. CheckCheck tensionstensions ofof bothboth threads.threads. SeeSee pagespages 1515
toto 21.21. UseUse aa ChecklistChecklist similarsimilar toto oneone shownshown onon pagepage 77
asas aa recordrecord forfor thethe manman atat thethe bench.bench.
6.6. InspectInspect woundwound bobbinsbobbins forfor properproper winding.winding.
SeeSee pagepage 79.79. BobbinBobbin mustmust turnturn freelyfreely insideinside
bobbinbobbin case.case.
ORDERORDER OFOF INSPECTIONINSPECTION ININ THETHE HOMEHOME
7.7. InspectInspect threadthread take-uptake-up springsettings.Seespringsettings.See 1.1. InspectInspect recentrecent samplessamples ofof sewingsewing mademade byby thethe
pagespages 1919 andand 20.20. customercustomer onon thethe machine,machine, beforebefore checkingchecking ma-ma-
chinechine itself.itself. AskAsk customercustomer toto indicateindicate onon sewingsewing
8.8. CheckCheck hookhook andand needleneedle relationship.relationship. SeeSee pagespages
samplessamples thethe particularparticular stitchingstitching faultsfaults sheshe hashas 9,41,9,41, 4343 andand 44.44.
mademade referencereference to.to.
9.9. CheckCheck timingtiming ofof needleneedle barbar andand sewingsewing hookhook
2.2. CheckCheck thethe combinationcombination ofof needleneedle andand threadthread duringduring straightstraight stitching.stitching. SeeSee pagepage 43.43.
usedused byby customer.customer. SeeSee pagepage 10.10.
10.10. CheckCheck positionposition fingerfinger inin bobbinbobbin casecase basebase forfor
properproper threadthread space.space. SeeSee pagepage 42.42.
3.3. CheckCheck needleneedle for-for-
11.11. CheckCheck heightheight ofof feedfeed dog;dog; itsits positionposition inin throatthroat
a.a. wearwear oror damagedamage (needle(needle blunt,blunt, bentbent oror
plate.plate.
burred).burred).
o.o. positionposition inin needleneedle clamp.clamp. SeeSee pagespages 1212 andand 12.12. CheckCheck performanceperformance ofof bightbight controlcontrol mechanism.mechanism.
88..88.. SeeSee pagespages 6262 toto 6767 andand 9292 toto 99.99.View original page 6Page 7 · Read text
SAMPLESAMPLE CHECKCHECK LISTLIST
)) FORFOR SERVICEMANSERVICEMAN ININ THETHE HOMEHOME
ITEMSITEMS REQUIRINGREQUIRING ATTENTIONATTENTION AREARE INDICATEDINDICATED BYBY CHECKCHECK && MARK:MARK:
1.1. QUALITYQUALITY OFOF STRAIGHTSTRAIGHT STITCHINGSTITCHING -CENTRAL-CENTRAL RIGHT.RIGHT. LEFTLEFT
2.2. ZIGZAGSZIGZAGS ININ STRAIGHTSTRAIGHT SEWINGSEWING POSITIONPOSITION [[ STAGGERSSTAGGERS OO
3.3. FRAYSFRAYS ANDAND BREAKSBREAKS SILKSILK THREADTHREAD DURINGDURING -CHAINING-CHAINING #25#25 STITCH.STITCH.
FRAYSFRAYS ANDAND BREAKSBREAKS MERC.MERC. COTTONCOTTON THREADTHREAD DURING-DURING- CHAININGCHAINING -- #25#25 STITCH.STITCH.
FREE-HANDFREE-HAND EMBROIDERYEMBROIDERY DD ZIGZAGZIGZAG SEWINGSEWING [[ STRAIGHTSTRAIGHT SEWINGSEWING OO
4.4. QUALITYQUALITY OFOF SATINSATIN STITCHSTITCH
5.5. QUALITYQUALITY OFOF ZIGZAGZIGZAG STITCHING_STITCHING_
6.6. QUALITYQUALITY OFOF TWINTWIN NEEDLENEEDLE SEWING.SEWING.
7.7. STALLSSTALLS ONON SATINSATIN STITCHINGSTITCHING OO SEWSSEWS ININ REVERSEREVERSE ATAT "O""O" DD
8.8. MACHINEMACHINE HARDHARD TOTO STARTSTART OO KNOCKSKNOCKS ATAT HIGHHIGH SPEEDSPEED DD
9.9. NEEDLENEEDLE RUBSRUBS THROATTHROAT PLATEPLATE LEFTLEFT SIDE.SIDE. RIGHTRIGHT SIDESIDE
)) 10.10. RELATIONRELATION OFOF HOOKHOOK TOTO NEEDLE-TOONEEDLE-TOO FARFAR AWAYAWAY [7[7 STRIKINGSTRIKING NEEDLENEEDLE
11.11. HOOKHOOK TIMING-SLOWTIMING-SLOW OO FASTFAST [J[J
12.12. SKIPSSKIPS ONON STRAIGHTSTRAIGHT STITCHINGSTITCHING OO ONON ZIGZAGZIGZAG OO
13.13. MACHINEMACHINE LOOPSLOOPS [[ GATHERSGATHERS
14.14. HOOKHOOK RATTLESRATTLES O]O] FEEDFEED NOISYNOISY TAKE-UPTAKE-UP LEVERLEVER
ININ LOWLOW POSITIONPOSITION OO LOOSELYLOOSELY FITTEDFITTED ••
15.15. BIGHTBIGHT CONTROLS--EASYCONTROLS--EASY [7[7 HARDHARD OO TOTO MOVEMOVEView original page 7Page 8 · Read text
NEEDLESNEEDLES ANDAND THREADSTHREADS
ForFor perfectperfect stitching,stitching, thethe selectionselection ofof thethe Class,Class, constant,constant, maintainingmaintaining anan identicalidentical relationshiprelationship be-be-
VarietyVariety andand SizeSize ofof aa needleneedle toto bebe usedused mustmust bebe basedbased tweentween short-grooveshort-groove sideside ofof allall 206206 ×× 1313 andand 306306 ×× 11
uponupon thethe designdesign andand capacitycapacity ofof thethe particularparticular sew-sew- needlesneedles andand thethe hookhook point.point. Therefore,Therefore, anyany increaseincrease
inging machinemachine asas wellwell asas thethe workwork toto bebe accomplished.accomplished. inin thethe diameterdiameter ofof thethe bladeblade resultsresults inin aa shiftingshifting ofof
onlyonly thethe centerlinecenterline ofof thethe needleneedle bladeblade awayaway fromfrom
thethe hookhook point.point.
TheThe distancedistance Y,Y, Fig.Fig. 22 fromfrom thethe butt-endbutt-end
ForFor efficientefficient andand attractiveattractive sewingsewing results,results, thethe ofof thethe shankshank ofof thethe needleneedle toto thethe toptop ofof thethe
needleneedle bladeblade isis designeddesigned toto bebe asas slenderslender asas possible,possible, needleneedle eyeeye isis constant,constant, regardlessregardless ofof needleneedle sizes,sizes,
FLATFLAT SIDESIDE BLADEBLADE
OFOF SHANKSHANK
FigFig 2.2. NeedleNeedle DistancesDistances
whilewhile sufficientlysufficiently strongstrong toto avoidavoid breakagebreakage atat thethe withinwithin allall ClassesClasses andand VarietiesVarieties ofof needlesneedles recom-recom-
needleneedle eye.eye. Therefore,Therefore, thethe sizesize ofof thethe needleneedle eye,eye, re-re- mendedmended forfor aa particularparticular sewingsewing machine.machine. ThisThis isis toto
quiredquired byby thethe thread,thread, determinesdetermines thethe idealideal sizesize ofof thethe maintainmaintain thethe correctcorrect relationshiprelationship ofof thethe heightheight ofof thethe
needleneedle blade.blade. TheThe actualactual sizesize numbernumber ofof thethe needleneedle eyeeye toto thethe pointpoint ofof thethe hook,hook, throughoutthroughout allall
needleneedle isis basedbased uponupon thethe diameterdiameter ofof thethe possiblepossible changeschanges ofof needles,needles, asas listedlisted forfor thethe sewingsewing
needleneedle bladeblade atat thethe eyeeye ofof thethe needle.needle. ThisThis machine.machine.
diameterdiameter isis constantconstant forfor allall sewingsewing machinemachine
needlesneedles ofof thethe samesame sizesize number.number. However,However, thethe sizesize ofof thethe needleneedle eyeeye increasesincreases withwith
thethe sizesize ofof thethe needleneedle toto accommodateaccommodate heavierheavier thread.thread.
TheThe distancedistance XX betweenbetween thethe short-grooveshort-groove sideside Therefore,Therefore, anyany increaseincrease inin thethe lengthlength ofof aa needleneedle
ofof thethe needleneedle bladeblade andand thethe positionposition ofof thethe flat-sideflat-side forfor oneone particularparticular machinemachine isis mademade fromfrom thethe toptop ofof
ofof thethe needleneedle shank,shank, seatedseated inin thethe needleneedle bar,bar, isis thethe needleneedle eyeeye towardtoward thethe pointpoint ofof thethe needle.needle.
88View original page 8Page 9 · Read text
HOOKHOOK ANDAND NEEDLENEEDLE RELATIONSHIPRELATIONSHIP
Fig.Fig. 3.3.
RelationshipRelationship ofof HookHook PointPoint toto NeedleNeedle EyeEye
TheThe hookhook pointpoint shouldshould passpass thethe needleneedle asas closeclose asas possible,possible, withoutwithout strikingstriking it.it. ThisThis willwill insureinsure
hookhook pointpoint entryentry ofof threadthread looploop duringduring ornamentalornamental zigzagzigzag stitching.stitching. AdjustAdjust byby looseningloosening screwscrew M4M4 andand proceedproceed
asas instructedinstructed onon pagepage 41.41.View original page 9Page 10 · Read text
CHARTCHART SHOWINGSHOWING RELATIONSHIPRELATIONSHIP OFOF TYPESTYPES OFOF FABRICS,FABRICS,
THREADTHREAD ANDAND NEEDLENEEDLE SIZESSIZES ANDAND
MACHINEMACHINE STITCHESSTITCHES TOTO THETHE INCHINCH
MACHINEMACHINE STITCHESSTITCHES
PERINCHPERINCH
THREADTHREAD NEEDLENEEDLE INSIDEINSIDE TOPTOP
TYPESTYPES OFOF FABRIGSFABRIGS SIZESSIZES SIZESSIZES SEAMSSEAMS STITCHINGSTITCHING
FilmyFilmy materialmaterial comparablecomparable toto Net,Net, MercerizedMercerized 0000
Marquisette,Marquisette, Chiffon,Chiffon, SilkSilk andand ChifChif 100100 CottonCotton 99 1515 toto 2020 1515 toto 2020 fonfon Velvets,Velvets, Voiles,Voiles, NinonNinon 0000 andand 000000 SilkSilk
NylonNylon ThreadThread
SheerSheer materialsmaterials comparablecomparable toto
MercerizedMercerized OO Lawn,Lawn, Dimity,Dimity, SyntheticSynthetic Sheers,Sheers,
8080 toto 100100 CottonCotton
PaperPaper Taffetas,Taffetas, PurePure Silks,Silks, Gossa-Gossa- 1212 toto 1515 1515 toto 2020 00 SilkSilk
mermer Silks,Silks, SilkSilk oror SyntheticSynthetic Tricots,Tricots,
NylonNylon ThreadThread SyntheticSynthetic Velvets,Velvets, SatinsSatins
LightweightLightweight materialsmaterials comparablecomparable
Gingham,Gingham, Chambray,Chambray, Pique,Pique, MercerizedMercerized 5050
Poplin,Poplin, Percale,Percale, Cretonne,Cretonne, Chintz,Chintz, 6060 toto 8080 CottonCotton
Faille,Faille, Bengaline,Bengaline, WoolWool Flannel,Flannel, AA SilkSilk 1414 1515 toto 1818
WoolWool Jersey,Jersey, WoolWool Crepe,Crepe, CottonCotton NylonNylon oror DacronDacron
VelvetsVelvets andand Velveteens,Velveteens, LightweightLightweight ThreadThread
SuitingsSuitings
MediumMedium heavyheavy materialsmaterials compar-compar-
ableable toto Corduroy,Corduroy, Crash,Crash, Gabar-Gabar- HeavyHeavy DutyDuty Merc.Merc. 4040 1616 1010 1212 dine,dine, Rep,Rep, HeavyHeavy SuitingsSuitings andand Coat-40Coat-40 toto 6060 CottonCotton
ingsings
HeavyHeavy materialsmaterials comparablecomparable toto
3030 toto 4040 CottonCotton Sailcloth,Sailcloth, Denim,Denim, Ticking,Ticking, Over-Over- 1010 1818 88 DacronDacron ThreadThread coatingscoatings
PlasticPlastic materialsmaterials MercerizedMercerized 5050
1010
TWISTTWIST OFOF THREADTHREAD
ForFor ordinaryordinary stitching,stitching, eithereither rightright oror leftleft twisttwist
threadthread cancan bebe usedused inin thethe needleneedle andand inin thethe bobbin.bobbin. HOLDHOLD THISTHIS ENDEND
ROLLROLL OVEROVER
ToTo determinedetermine twisttwist ofof thread,thread, holdhold threadthread asas shownshown
atat rightright andand turnturn threadthread overover towardtoward youyou betweenbetween
thumbthumb andand forefingerforefinger ofof rightright hand.hand. IfIf threadthread isis leftleft
twist,twist, thethe strandsstrands willwill windwind tighter;tighter; ifif rightright twist,twist, thethe
strandsstrands willwill unwind.unwind. Fig.Fig. 4.4. DeterminingDetermining thethe TwistTwist ofof ThreadThread
1010View original page 10Page 11 · Read text
TOTO ORDERORDER NEEDLESNEEDLES FORFOR SWING-NEEDLESWING-NEEDLE MACHINESMACHINES
SingleSingle needlesneedles forfor thesethese MachinesMachines areare ofof ClassClass
threadthread willwill interfereinterfere withwith thethe successfulsuccessful useuse ofof thethe
machine.machine.
andand VarietyVariety14,14, 1616 andand20620618.18.xx 1313 andand areare mademade inin SizesSizes 9,9, 11,11,
WheneverWhenever aa machinemachine breaksbreaks threadthread oror skips,skips, trytry
thethe nextnext sizesize largerlarger needle.needle.
TheThe sizesize ofof thethe needleneedle toto bebe usedused dependsdepends uponupon thethe
sizesize ofof thethe threadthread whichwhich mustmust passpass freelyfreely throughthrough thethe OrdersOrders forfor needlesneedles mustmust specifyspecify thethe QuantityQuantity re-re-
eyeeye ofof thethe needle.needle. quired,quired, thethe SizeSize number,number, alsoalso thethe ClassClass andand VarietyVariety
numbers,numbers, separatedseparated byby anan x.x.
DoDo notnot useuse roughrough oror unevenuneven threadthread oror threadthread whichwhich
TheThe followingfollowing isis anan exampleexample ofof anan intelligibleintelligible order:order:
passespasses withwith difficultydifficulty throughthrough thethe needleneedle eye,eye, asas suchsuch
"100"100 No.No. 18,18, 206206 xx 1313 Needles.Needles.
DESCRIPTIONDESCRIPTION OFOF 306306 xx 11 TWINTWIN NEEDLESNEEDLES
Twin-needlesTwin-needles ofof ClassClass andand VarietyVariety 306306 ×× 1,1,
"100"100 No.No. 14,14, 306306 ×× 1-31-3 Needles."Needles."
mouldedmoulded togethertogether inin oneone assembly,assembly, areare mademade inin SizesSizes
1111 andand 1414 forfor aa maximummaximum bightbight ofof 3mm.3mm. AlwaysAlways
includeinclude desireddesired bightbight whenwhen ordering,ordering, asas shownshown byby
TheThe bestbest stitchingstitching resultsresults willwill bebe obtainedobtained withwith
thethe followingfollowing example:example:
)) needlesneedles soldsold byby SingerSinger SewingSewing MachineMachine Company.Company.
1515 xx 11 NEEDLESNEEDLES FORFOR MACHINESMACHINES OFOF CLASSCLASS 401401
TheseThese machinesmachines useuse needlesneedles ofof ClassClass andand VarietyVariety
1515 xx 1,1, availableavailable inin sizessizes 9,9, 11,11, 14,14, 1616 andand 18.18.
TOTO PREVENTPREVENT BREAKINGBREAKING OFOF NEEDLESNEEDLES
TheThe mostmost commoncommon causecause ofof needleneedle breakagebreakage isis thethe
unlessunless thethe correctcorrect relativerelative positionposition betweenbetween thethe
pullingpulling ofof thethe materialmaterial byby thethe operator,operator, whilewhile thethe ma-ma-
needle,needle, throatthroat plateplate andand presserpresser footfoot isis maintained,maintained,
chinechine isis sewing..sewing.. ThisThis practicepractice isis entirelyentirely unnecessary,unnecessary, asas instructedinstructed onon pagepage 52.52.
asas thethe machinemachine (when(when properlyproperly adjusted)adjusted) willwill feedfeed thethe
materialmaterial correctlycorrectly withoutwithout assistanceassistance TheThe needleneedle oror thethe hookhook pointpoint maymay breakbreak unlessunless thethe
machinemachine isis correctlycorrectly timed,timed, asas instructedinstructed onon pagespages 4141
AttemptingAttempting toto performperform zigzagzigzag stitching,stitching, whilewhile thethe andand 43.43.
machinemachine isis fittedfitted withwith straightstraight stitchingstitching throatthroat plateplate
oror presserpresser foot,foot, willwill alsoalso causecause breakingbreaking ofof needles.needles. NOTE:NOTE: DoDo notnot exceedexceed numbernumber threethree onon bightbight
controlcontrol whenwhen sewingsewing withwith twintwin
TheThe needleneedle maymay breakbreak unlessunless itit isis correctlycorrectly locatedlocated
needles,needles, otherwiseotherwise bendingbending oror break-break-
yinyin thethe needleneedle clamp,clamp, asas instructedinstructed onon pagepage 12,12, oror ageage willwill occur.occur.
1111
InsertInsert inin placeplace ofof pagepage 1111 inin FormForm 2073220732 (257)(257)View original page 11Page 12 · Read text
LOGATIONLOGATION OFOF NEEDLENEEDLE ININ NEEDLENEEDLE CLAMPCLAMP
IfIf thethe needleneedle isis incorrectlyincorrectly placedplaced inin thethe needleneedle Fig.Fig. 6,6, facingfacing thethe rearrear ofof machine,machine, awayaway fromfrom thethe
clampclamp andand isis incorrectlyincorrectly threaded,threaded, thethe machinemachine willwill operator,operator, thenthen securelysecurely tightentighten needleneedle clampclamp thumbthumb
nornor sawsaw screw.screw.
MOVEMOVE TOTO
NEEDLENEEDLE CLAMPCLAMP
HIGHESTHIGHEST
THUMBTHUMB SCREWSCREW
POINTPOINT
FLATFLAT SIDESIDE
TOTO REARREAR
INSERTINSERT NEEDLENEEDLE
UPUP ASAS FARFAR ASAS
POSSIBLEPOSSIBLE
LONGLONG GROOVEGROOVE
TOTO FRONTFRONT ->->
SHORTSHORT
GROOVEGROOVE
Fig.Fig. 5.5. SettingSetting thethe NeedleNeedle Fig.Fig. 6.6. FlatFlat SideSide ofof NeedleNeedle (Enlarged)(Enlarged)
MakeMake suresure thatthat needleneedle isis notnot bluntblunt oror bent.bent. YouYou willwill notenote fromfrom Fig.Fig. 66 thotthot thethe sideside ofof thethe
needleneedle withwith thethe flatflat onon thethe shankshank hashas aa shortshort groovegroove
atat thethe eye,eye, whilewhile thethe oppositeopposite side,side, shownshown inin Fig.Fig. 5,5,
hashas aa longlong groove.groove. OnOn allall machinesmachines thethe needleneedle isis
LoosenLoosen needleneedle clampclamp thumbthumb screwscrew andand insertinsert needleneedle threadedthreaded fromfrom thethe longlong groovegroove sideside towardtoward thethe shortshort
inin thethe needleneedle clampclamp slot,slot, allall thethe wayway upup againstagainst thethe groove;groove; thusthus thethe needleneedle onon thisthis machinemachine isis threadedthreaded
stop,stop, withwith thethe flatflat sideside ofof thethe shankshank ofof thethe needle,needle, seesee fromfrom frontfront toto rear.rear.View original page 12Page 13 · Read text
FORMATIONFORMATION OFOF THETHE LOCKLOCK STITCHSTITCH
THREADTHREAD TAKE-UPTAKE-UP
-- THREADTHREAD TAKE-UPTAKE-UP
LEVERLEVER
LEVERLEVER
VANVAN SISI
TENSIONTENSION TENSIONTENSION
DISCSDISCS DISCSDISCS
ÑEEDLEÑEEDLE
MAMA WEEDLEWEEDLE
PRESSERPRESSER FOOTFOOT
PRESSERPRESSER FOOTFOOT
HOOKHOOK BOBBINBOBBIN CASECASE BOBBINBOBBIN CASECASE
POINTPOINT
-- ROTATINGROTATING HOOKHOOK ,, HOOKHOOK POINTPOINT
ROTATINGROTATING HOOKHOOK
Fig.Fig. 7.7. PointPoint ofof HookHook EnteringEntering
Fig.Fig. 8.8. LoopLoop ofof NeedleNeedle ThreadThread
LoopLoop ofof NeedleNeedle ThreadThread EnclosingEnclosing bobbinbobbin CaseCase
Fig.Fig. 77 showsshows thethe firstfirst stagestage inin stitchstitch forma-forma- Fig.Fig. 88 showsshows thethe secondsecond stage.stage. TheThe hookhook isis soso
tion.tion. TheThe threadthread leadingleading toto thethe needleneedle isis slackslack be-be- timedtimed asas toto enterenter thethe threadthread looploop andand carrycarry thethe looploop
causecause thethe threadthread take-uptake-up leverlever hashas begunbegun itsits aroundaround thethe bobbinbobbin casecase containingcontaining thethe bobbinbobbin thread.thread.
descent.descent. TheThe needle,needle, afterafter reachingreaching itsits lowestlowest point,point, Take-upTake-up lever,lever, inin descending,descending, furnishesfurnishes allall thethe threadthread
risesrises toto formform aa looploop ofof threadthread forfor thethe hookhook pointpoint toto requiredrequired toto enlargeenlarge thethe looploop forfor passagepassage aroundaround bob-bob-
enter.enter. binbin case.case.))
1313View original page 13Page 14 · Read text
FORMATIONFORMATION OFOF THETHE LOCKLOCK STITCHSTITCH (Continued)(Continued)
-THREAD-THREAD TAKE-UPTAKE-UP
THREADTHREAD TAKE-UPTAKE-UP
LEVERLEVER LEVERLEVER
WANWAN SITSIT
TENSIONTENSION TENSIONTENSION
DISCSDISCS DISCSDISCS
NEEDLENEEDLE •• NEEDLENEEDLE
PRESSERPRESSER FOOTFOOT PRESSERPRESSER FOOTFOOT
BOBBINBOBBIN HOOKHOOK POINTPOINT HOOK-HOOK- BOBBINBOBBIN CASECASE
CASECASE
POINTPOINT
ROTATINGROTATING HOOKHOOK -- ROTATINGROTATING HOOKHOOK
Fig.Fig. 9.9. BobbinBobbin ThreadThread EnclosedEnclosed byby NeedleNeedle ThreadThread Fig.Fig. 10.10. StitchStitch CompletedCompleted
Fig.Fig. 99 showsshows thethe thirdthird stage.stage. TheThe looploop ofof thethe Fig.Fig. 1010 showsshows thethe finalfinal stagestage ofof lockinglocking thethe stitch.stitch.
needleneedle threadthread hashas beenbeen castcast offoff thethe hookhook andand thethe AsAs thethe take-uptake-up leverlever risesrises toto itsits highesthighest position,position, thethe
take-uptake-up leverlever isis risingrising quicklyquickly toto taketake upup allall thethe slackslack feedfeed dogdog isis completingcompleting itsits forwardforward motion,motion, thusthus lock-lock-
thread.thread. inging thethe twotwo threadsthreads intointo aa locklock stitch.stitch.View original page 14Page 15 · Read text
THETHE PERFECTPERFECT LOCKLOCK STITCHSTITCH
Fig.Fig. 11.11. CrossCross SectionSection ViewView
ofof PerfectPerfect locklock StitchStitch Fig.Fig. 13.13. CrossCross SectionSection ViewView ofof LockLock StitchStitch
withwith LooseLoose NeedleNeedle ThreadThread TensionTension
WhenWhen thethe tensionstensions ofof bothboth thethe needleneedle threadthread andand
IrregularIrregular stitching,stitching, suchsuch asas isis shownshown inin
thethe bobbinbobbin threadthread areare correctlycorrectly adjusted,adjusted, thethe stitchesstitches
Fig.Fig. 14,14, isis usuallyusually causedcaused byby aa combinationcombination ofof
willwill bebe lockedlocked inin thethe centercenter ofof thethe thicknessthickness ofof thethe
twotwo oror moremore ofof thethe followingfollowing conditions:conditions:
material,material, asas shownshown inin Fig.Fig. 11.11.
WhenWhen thethe tensiontension ofof thethe needleneedle threadthread isis setset tootoo
a.a. TooToo looseloose oror tootoo tighttight needleneedle threadthread tension.tension.
tighttight inin relationrelation toto thethe bobbinbobbin thread,thread, excessexcess bob-bob-
b.b. TooToo looseloose oror tootoo tighttight bobbinbobbin threadthread tension.tension.
Fig.Fig. 12.12. CrossCross SectionSection ViewView ofof LockLock StitchStitch withwith
TightTight NeedleNeedle ThreadThread TensionTension Fig.Fig. 14.14. CrossCross SectionSection ViewView ofof anan
IrregularIrregular LockLock StitchStitch
binbin threadthread isis drawndrawn toto thethe toptop ofof thethe material,material, causingcausing
c.c. DamagedDamaged oror improperlyimproperly setset tensiontension springspring onon
aa looseloose stitch,stitch, asas shownshown inin Fig.Fig. 12.12. bobbinbobbin case.case.
WhenWhen thethe tensiontension ofof thethe needleneedle threadthread isis setset tootoo d.d. WornWorn oror damageddamaged positionposition finger.finger.
looseloose inin relationrelation toto thethe bobbinbobbin thread,thread, excessexcess BentBent needleneedle oror damageddamaged needleneedle eye.eye.
needleneedle threadthread isis drawndrawn toto thethe bottombottom ofof thethe materialmaterial ImproperImproper feedingfeeding ofof material.material.
andand thethe bobbinbobbin threadthread maymay lielie straightstraight alongalong thethe un-un-
g.g. UseUse ofof wrongwrong needleneedle andand threadthread combination.combination.
dersidederside ofof thethe material,material, asas shownshown inin Fig.Fig. 13.13.
h.h. IncorrectIncorrect feedfeed time.time.
1515View original page 15Page 16 · Read text
TENSIONTENSION CONDITIONSCONDITIONS
WhenWhen checkingchecking andand adjustingadjusting machinemachine forfor tensiontension properproper tensiontension ofof machinemachine isis toto startstart withwith longestlongest
conditionsconditions inin relationrelation toto perfectperfect sewing,sewing, useuse aa SizeSize 1414 stitchstitch andand makemake suresure thatthat nono loopinglooping appearsappears inin thethe
needleneedle andand "A""A" silksilk thread.thread. SilkSilk threadthread shouldshould bebe usedused stitching.stitching. ThenThen shortenshorten stitchstitch toto approximatelyapproximately #25#25
toto establishestablish properproper "O'"O' settingsetting ofof needleneedle threadthread ten.ten. andand notenote whetherwhether oror notnot tensiontension isis satisfactory.satisfactory. IfIf
sionsion andand bobbinbobbin threadthread tensiontension shouldshould bebe adjustedadjusted noticeablenoticeable variationsvariations occur,occur, makemake suresure allall tracestraces ofof
withwith silksilk asas describeddescribed onon pagepage 21.21. AfterAfter completingcompleting thethe tackytacky anti-rustanti-rust oiloil areare removedremoved fromfrom thethe polishedpolished
sewingsewing teststests withwith silk,silk, repeatrepeat thesethese teststests withwith #50#50 surfacessurfaces ofof thethe sewingsewing hookhook andand tensiontension parts.parts. SeeSee
mercerizedmercerized cottoncotton thread.thread. SilkSilk threadthread willwill showshow upup instructionsinstructions onon pagepage 4.4. FailureFailure toto washwash thethe hookhook
anyany tendencytendency forfor thethe machinemachine toto skip,skip, frayfray oror breakbreak withwith VarsolVarsol andand toto oiloil itit afterafter cleaning,cleaning, maymay resultresult inin
threadthread beforebefore suchsuch conditionsconditions wouldwould bebe notednoted withwith manymany formsforms ofof loopinglooping trouble.trouble.
mercerizedmercerized thread.thread.
TestTest thethe machinemachine atat thethe followingfollowing settings:settings: SATINSATIN STITCHINGSTITCHING
1.1. StraightStraight sewingsewing atat left-,left-, centralcentral andand right-right- WhenWhen satinsatin stitching,stitching, feedfeed andand tensiontension adjustmentsadjustments
handhand positionposition ofof needleneedle andand atat bothboth longestlongest mustmust bebe veryvery carefullycarefully mademade toto insureinsure aa uniformuniform
andand shortestshortest stitchstitch setting.setting. qualityquality ofof satinsatin stitch.stitch. CordingCording ofof fabricfabric cancan bebe ex-ex-
pectedpected ifif excessiveexcessive needleneedle threadthread tensiontension isis employedemployed 2.2. MaximumMaximum zigzagzigzag stitchingstitching atat extremeextreme left-left-
oror ifif "O""O" dialdial tensiontension settingsetting isis tootoo high.high.
andand right-handright-hand positionposition ofof needleneedle andand atat
bothboth longestlongest andand shortestshortest stitchstitch settings.settings.
OPENOPEN ZIGZAGZIGZAG STITCHINGSTITCHING
STRAIGHTSTRAIGHT STITCHINGSTITCHING
OnOn openopen zigzagzigzag stitchingstitching itit isis notnot alwaysalways possiblepossible toto
TheThe amountamount ofof needleneedle threadthread tensiontension requiredrequired toto locklock thethe stitchstitch inin thethe cornerscorners withoutwithout cordingcording thethe fab.fab.
makemake aa satisfactorysatisfactory straightstraight stitchstitch willwill varyvary withwith eacheach ricric unlessunless 11 oror 22 thicknessesthicknesses ofof somesome crispcrisp underlay,underlay,
machine.machine. AA closelyclosely fittedfitted hookhook maymay requirerequire betweenbetween suchsuch asas organdy,organdy, areare used.used. WhenWhen underlayunderlay isis used,used,
#5#5 andand #7#7 onon dialdial tension.tension. AA looselyloosely fittedfitted hookhook maymay additionaladditional needleneedle threadthread tensiontension maymay bebe requiredrequired toto
requirerequire betweenbetween #4#4 andand #6.#6. TheThe safestsafest testtest toto insureinsure locklock thethe stitchstitch inin thethe corners.corners.
1616View original page 16Page 17 · Read text
SEWINGSEWING DIFFICULTIESDIFFICULTIES CAUSESCAUSES REMEDIESREMEDIES
NeedleNeedle tootoo smallsmall forfor sizesize UseUse correctcorrect needle.needle. SeeSee pagepage
ofof thread.thread. 10.10.
TooToo littlelittle needleneedle threadthread IncreaseIncrease upperupper tension.tension. CheckCheck
tension.tension. FaultyFaulty take-uptake-up strokestroke ofof spring--replacespring--replace ifif neces.neces.
springspring action.action. sary.sary. SeeSee pagespages 1919 andand 20.20.
IrregularIrregular settingsetting ofof stitchesstitches withwith largelarge beadsbeads FreeFree hookhook ofof anyany threads,threads, gumgum
showingshowing onon thethe undersideunderside ofof thethe fabric.fabric. CloggedClogged oror stickysticky sewingsewing oror otherother foreignforeign matter.matter. IfIf neces-neces-
hook.hook. sarysary replacereplace hookhook andand bobbinbobbin
casecase holder.holder.
ProvideProvide .020.020 inchinch threadthread spacespace
betweenbetween bobbinbobbin casecase holderholder andand
InsufficientInsufficient threadthread space.space.
positionposition finger.finger. SeeSee pagepage 42.42.
InspectInspect fingerfinger forfor roughness.roughness.
NeedleNeedle threadthread tensiontension ReduceReduce tension.tension.
FabricFabric drawingdrawing onon openopen zigzagzigzag stitchstitch ofof tootoo tight.tight.
mediummedium stitchstitch length.length.
PressurePressure onon taketake -- UpUp ReduceReduce pressurepressure onon take-uptake-up
spring.spring. SeeSee pagepage 20.20.
)) springspring isis tootoo great.great. ReduceReduce tensiontension soso thatthat materialmaterial
isis notnot drawndrawn yetyet stitchstitch lieslies flat.flat. FabricFabric drawingdrawing onon allall shortshort zigzagzigzag stitchingstitching NeedleNeedle threadthread tensiontension
UndersideUnderside stitchingstitching willwill notnot locklock fromfrom mediummedium toto maximummaximum bight.bight. tootoo tight.tight.
inin cornerscorners butbut inin betweenbetween needleneedle
perforations.perforations.
TensionTension mustmust bebe lighterlighter forfor MaterialMaterial drawingdrawing whenwhen sewingsewing withwith Silk,Silk,
UpperUpper tensiontension tootoo tight.tight. syntheticsynthetic threadsthreads thanthan forfor cotton.cotton. NylonNylon oror DacronDacron Threads.Threads.
ReduceReduce tension.tension.
UseUse aa solidsolid footfoot inin placeplace ofof aa
MaterialMaterial maymay bebe flaggingflagging
MachineMachine skippingskipping atat extremeextreme leftleft oror rightright hingedhinged foot.foot. ReplaceReplace needle.needle.
withwith needle.needle. NeedleNeedle maymay
needleneedle positionposition whenwhen sewingsewing withwith SilkSilk oror CheckCheck heightheight ofof needleneedle barbar inin
bebe bentbent oror settingsetting tootoo NylonNylon threads.threads. relationrelation toto hook.hook. SeeSee pagespages 4444
high.high.
andand 45.45.
AllAll adjustmentsadjustments onon needleneedle threadthread tension,tension, seesee pagepage bobbinbobbin threadthread tensiontension isis correctlycorrectly setset atat thethe factoryfactory
18,18, shouldshould bebe mademade onon thethe assumptionassumption thatthat thethe andand shouldshould notnot bebe unnecessarilyunnecessarily disturbed.disturbed.View original page 17Page 18 · Read text
TOTO REGULATEREGULATE THREADTHREAD TENSIONSTENSIONS
NEEDLENEEDLE THREADTHREAD TENSIONTENSION
ThisThis machinemachine isis equippedequipped withwith aa one-cycleone-cycle dialdial ten-ten-
sionsion which,which, whenwhen setset correctly,correctly, offersoffers aa barelybarely per-per-
ceptibleceptible tensiontension atat "O""O" toto aa maximummaximum atat thethe endend ofof
oneone completecomplete rurnrurn oror thumbthumb nurnur
AtAt "O""O" therethere shouldshould bebe aa barelybarely perceptibleperceptible amountamount
ofof tension,tension, asas otherwise,otherwise, difficultydifficulty maymay bebe experiencedexperienced
whenwhen sewingsewing withwith twintwin needles,needles, satinsatin stitchingstitching andand
otherother formsforms ofof closedclosed ornamentalornamental stitching.stitching. Fig.Fig. 15.15. "O""O" SettingSetting
PullPull threadthread throughthrough tensiontension discsdiscs toto testtest amountamount ofof nono tension.tension. ThenThen advanceadvance oneone holehole toto rightright toto givegive
ofof tensiontension onon threadthread atat "O""O" position.position. AtAt thisthis pointpoint minimumminimum tensiontension atat zerozero position.position.
therethere shouldshould bebe aa slightslight pullpull onon thethe threadthread toto indicateindicate
TOTO OBTAINOBTAIN INGREASEDINGREASED TENSIONTENSION RANGERANGE
therethere isis aa minimumminimum tensiontension whichwhich graduallygradually increasesincreases
withwith thethe turningturning ofof thumbthumb nutnut AA toto thethe right,right, providingproviding OnOn somesome occasionsoccasions aa slightslight increaseincrease inin maximummaximum
aa fullfull rangerange ofof tensionstensions withwith oneone revolutionrevolution ofof thethe rangerange ofof needleneedle threadthread tensiontension maymay bebe requiredrequired forfor
thumbthumb nut.nut. IfIf thethe pullpull isis tootoo strongstrong forfor aa minimumminimum specialspecial work.work.
tension,tension, presspress inin dialdial CC toto disengagedisengage pinpin BB onon nutnut TheThe additionaladditional tensiontension maymay bebe obtainedobtained byby usingusing
fromfrom dial,dial, andand resetreset pinpin inin nextnext holehole toto leftleft ofof previousprevious tensiontension indicatorindicator No.No. 125415125415 andand tensiontension springspring No.No.
setting.setting. RepeatRepeat thisthis adjustmentadjustment untiluntil aa pointpoint isis reachedreached 4586945869 ifif thethe machinemachine isis notnot equippedequipped withwith thesethese parts.parts.
TOTO REMOVEREMOVE ANDAND DISASSEMBLEDISASSEMBLE NEEDLENEEDLE THREADTHREAD TENSIONTENSION
TurnTurn thumbthumb nutnut AA overover toto thethe leftleft (counter-clock-(counter-clock- removeremove it.it. ThenThen removeremove tensiontension partsparts fromfrom studstud asas
wise)wise) untiluntil itit stops.stops. ToTo separateseparate pinpin BB inin thumbthumb nutnut AA shownshown inin Fig.Fig. 16.16.
fromfrom dialdial C,C, presspress inin dial,dial, unscrewunscrew thumbthumb nutnut andandView original page 18Page 19 · Read text
TOTO REASSEMBLEREASSEMBLE ANDAND REPLACEREPLACE NEEDLENEEDLE THREADTHREAD TENSIONTENSION
PlacePlace tensiontension partsparts onon thethe studstud asas illustrated:illustrated: 3.3. TensionTension springspring mustmust bebe mountedmounted soso thethe halfhalf coilcoil
atat frontfront isis inin thethe lowerlower position.position. 1.1. MakeMake suresure tensiontension discsdiscs areare freefree ofof oil,oil, gritgrit oror))
grease.grease.
2.2. IndicatorIndicator mustmust showshow plusplus andand minusminus signssigns atat toptop 4.4. FingerFinger ofof slottedslotted washerwasher mustmust pointpoint upwardupward toto
forfor operator'soperator's convenience.convenience. actact asas aa stopstop forfor dial.dial.
060060
Е24740Е24740
Fig.Fig. 16.16. NeedleNeedle ThreadThread TensionTension AssemblyAssembly
))
TOTO ADJUSTADJUST THETHE THREADTHREAD TAKE-UPTAKE-UP SPRINGSPRING
STROKESTROKE OFOF SPRINGSPRING TOTO SETSET TAKE•UPTAKE•UP SPRINGSPRING STROKESTROKE
TheThe take-uptake-up springspring J,J, Fig.Fig. 1717 shouldshould bebe atat restrest LoosenLoosen setset screwscrew L,L, Fig.Fig. 17.17.
againstagainst itsits stopstop asas thethe pointpoint ofof thethe needleneedle entersenters thethe RotateRotate tensiontension studstud ZZ clockwiseclockwise withwith aa screwdriverscrewdriver
fabric.fabric. (turning(turning wholewhole tensiontension assembly)assembly) toto completecomplete itsits actionaction
over.over.
RotateRotate tensiontension studstud ZZ counter-clockwisecounter-clockwise withwith aa
WhenWhen adjustingadjusting take-uptake-up spring,spring, thethe strokestroke screwdriverscrewdriver (turning(turning wholewhole tensiontension assembly)assembly) toto com-com-
mustmust bebe adjustedadjusted first,first, thenthen followedfollowed byby thethe pleteplete itsits actionaction earlier.earlier.
pressurepressure ofof thethe spring.spring. SecurelySecurely tightentighten setset screwscrew L.L.
G8G8
Fig.Fig. 17.17. SettingSetting Fig.Fig. 18.18. RemovingRemoving
StrokeStroke ofof springspring TensionTension AssemblyAssembly
1919View original page 19Page 20 · Read text
PRESSUREPRESSURE OFOF SPRINGSPRING InsertInsert assemblyassembly intointo machinemachine withwith plusplus andand minusminus
signssigns ofof indicatorindicator inin uppermostuppermost positionposition andand holdhold ten-ten-
sionsion assemblyassembly inin place.place.
TensionTension onon threadthread take-uptake-up springspring shouldshould bebe justjust
sufficientsufficient toto taketake upup slackslack ofof needleneedle threadthread untiluntil needleneedle MoveMove looploop ofof springspring toto thethe leftleft soso thatthat itit maymay comecome
pointpoint reachesreaches thethe fabric.fabric. toto restrest againstagainst itsits stop.stop.
1.81.8
E25055E25055 E25056E25056
Fig.Fig. 19.19. ShowingShowing Fig.Fig. 20.20. SpringSpring
SpringSpring LeftLeft ofof CenterCenter LineLine
ExcessiveExcessive pressurepressure willwill causecause fabricfabric toto cordcord (draw)(draw) SecurelySecurely tightentighten screwscrew G8,G8, Fig.Fig. 18.18.
duringduring satinsatin stitchingstitching oror widewide bightbight zigzagzigzag stitching.stitching.
TestTest pressurepressure ofof springspring toto determinedetermine ifif aa finerfiner adjust-adjust-
mentment isis needed.needed.
InsufficientInsufficient pressurepressure willwill causecause loopinglooping oror threadthread
breakage.breakage. NOTE:NOTE: IfIf moremore pressurepressure isis required,required, movemove smallsmall tailtail
ofof springspring L8L8 intointo thethe nextnext studstud slotslot toto thethe
rightright ofof previousprevious setting.setting.
IfIf lessless pressurepressure isis required,required, movemove smallsmall tailtail ofof springspringTOTO ESTABLISHESTABLISH MINIMUMMINIMUM PRESSUREPRESSURE OFOF SPRINGSPRING
L8L8 intointo thethe nextnext studstud slotslot toto thethe leftleft ofof previousprevious setting.setting.
TurnTurn screwscrew G8,G8, Fig.Fig. 1818 counter-clockwisecounter-clockwise andand NOTE:NOTE: AA veryvery finefine adjustmentadjustment forfor pressurepressure ofof thethe
removeremove tensiontension assembly.assembly. springspring cancan bebe hadhad byby looseningloosening screwscrew G8,G8,
Fig.Fig. 1818 andand turningturning completecomplete assemblyassembly
clockwiseclockwise toto increaseincrease pressurepressure andand counter-counter-
slideslide springspring onon tensiontension assemblyassembly soso thatthat tailtail ofof
clockwiseclockwise toto decreasedecrease pressure.pressure.
springspring L8,L8, Fig.Fig. 1919 isis inin oneone ofof thethe studstud slotsslots andand toptop
ofof springspring J,J, isis justjust leftleft ofof centercenter lineline onon indicatorindicator inin RetightenRetighten screwscrew G8G8 andand testtest springspring pressurepressure
thethe areaarea betweenbetween dotteddotted lines,lines, illustratedillustrated inin Fig.Fig. 20.20. byby sewing.sewing.
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