64436236-Juki-LH-512-LH-515

High speed, Two-needle, Needle feed,Lookstitch Industrial Sewing Machine

High speed, Twa-needle, Needle feed.Locicstitch Industrial Sewing Machinewith Reverse Feed MechanismINSTRUCTION BOOK

3OKY JUKI INDUSTRIIAL COLTI.

TABLE OF CONTENTS

I. GENERAL DESCRIPTIONI. Mare features.. . . . . . . . . .

2. SpecificationsII. ORDER OF INSTALLATION & RUNNING THE MACHINE

1 Order of installation .. . ... . .. .. . . 32. Motor pulley anid belt .... . . . . . ... 5

Ill. HOW TO OPERATE THE MACHINE1Lubrication of face part .. . . . . . . .. 7

2. Adjusting the oil a ont of the sewkng hook.....!

3. low to insert the needles ... . . . .. ... 94. Thricads ,.. . . . . .. . . . ............ 105 Passing the needle thread .. . . . . . . . . . . I0

6. Passing the lbobbin t weaj .. . . . . .. . . . . 1

7. Regulating the thread tension .. . . .. . . .. . [

8. Adjusting the stitch length . . . . . . . . . . 1

IV. ADJUSTING THE MACHINEI, Matching the thread handling device . . . . . . . .. 142. Adjusting tihe thread handling device ........... IS.3. Relationship beltween ti te needle and the sewing book........ 154. Adjusting the clearan ce between the needle and

thle tip of thle sewing book . ...... . .. .. . .. .5, Installing and remnovinig the sewinag hook . . . . . .. I 7/

6Adjulstinlg thle height of the feed dog .. . . . . . ]87. A dj u sing thle fore anml a ft posit ions of

the needle ba r rockig Cmrame rock shaft .. . . ... . I98. I xchanging the timing belt . . . . . . . . .. 20

94. Matching hie timing bel............................. 20

V. HOW TO PRODUCE IDEAL SEWING CONDITIONSMODEL LH-515 INSTRUCTION BOOK<

* Specifications................................. 25

2. M otor pulley and belt .. . . .. . . .. . . . 26

3. Rcyerse sewing .. . . . . . . . . . . . . 26

4, Specifecations for standard sewing .. . . . . . . .27

5. Adjusting the fore and alt positions ol

the needle bar rocking frame rock shaft...............276, Adjusting tihe maximum stitch length ,.......... 287. Exchanging the timing belt ........ 28

I, GENERAL DESCRIPTION

I I U Model LIt I.2 is a high speed t wo-needle, needle feed, lckst itch

industrial sewing machine, capable of sewing at a speed of tip to 4.200 sp.nr,

designed and const rueted to wit hst anrd high speed sewing and aimed to strength-en tie durabi lit y fact o id ust rial se-wirig maechinte.

NOT F: The operating islinsia di o f J U XI MadciLIH.515 is p ractiCa ly sameas I U KI Model LIl .- 52 wit silight d t fei euces and these CX CeplOIns aIC point -ed out in lhe last pages of this INSIRRUCTION BOO K.

1. MAIN FEATURESSLink I ype thread lake'-itpi thle past, it was a colI~n* practice for an1 industrial machine of this

type to be eqtuipped with a slide lype thread take-up. h~owever, this slide type

lacked high speed poiwer anad also thle durability was iniad equate.*fo overco me this d eficiccy, this 'machine has a do pted a link type thread

take-u p to ensure high s1,eed feature and durability and tol produce pucker-

free produtets,*Positive Iced nie ha nisat

Tlhis machine has adopted aisihtton type cead camI adjusting systemid needle bearings. The compoun rd feed cain parts are made of hightly durable

and scorch-resisting materials and as slide hlock system is adopted, even at highspee d sew ig, there is no worry of undue depreciat ion or scorching of essential

parts.* Lubrication systenl

Thle lubricating oil which is siphon~ed uip by the lead pump at the hottomI~ of

thle base of the sewing hook shalt, is pushed up to tihe right and[ left base ofthe sewing hook and further onr to thle oil gauge of the arm and lubricates thleinside of lhe shaft bushing of the thread take-up. thie face part is lubricated bymeans of wicks frora the shaft hushing of the thread take-up, so Oaiform lu bri-

cation is assured. All metal parts are conlstructed ol Idoled a loys, thtus

lubricationl Io these parts is not esLy

* thbread handlinlg mechanismlIn he previous mod els, the thread handling ruechanIism moved twice against

ta, rttion s of the sewing hoo]k but his mac hinte is so const rueled (or tilehue-ad handlinlg in echla n in to move just once aiga inst two rotions of the sew -ig hook. Ih us. with tliis itmprove n t, the life of the se'wing hook is muchprolonged and the running sound is greatly minimized.

l ook shaft bushingNeedle b~aah gs are used on th' tipper part of both rightr and leit hook

shatft htsib igs aid ball hea rings are used artlIower part, assu iring high speed

tea/ture as well a*s sturdy durability,

2. SPECIFICATIONS

Sewing type ......... l w m-needlr, oc~kqitch, Ieedk, teedUsage ......... li hi we ight & med iun heavy inatermias

Cuffs of Inlel's shirts, shirt Fonts. attachingpockets owork tunifornms, blind stilch ol troti-sers. attaching tapes lto ricot materials, sewinlgsides ol [rlns sulits. ier lining ot waist, etc.)

Sewing speed ........ Up to 4200 spinI hread take-up........... Link lypeNeedle bar stroke.........3.36 m I S/I I"Needles................IJPNT(135 x ?)#144lIgor

)PX5 1I35 X 5,134. 7Th7, 13t0.1S44, lq51)

Presser lfting anlotnl .... Presser lifter lever 9hm /364'

Knee lijfter I 1m nll7/I1lee d ime oh an iSm ... Lowe {cred & iteed lV eedi

Stitch length ,.-. MNaxhlun 4m (nS1/32"'I

Suildi adjust mlelnu * . Eccenltric lcrngthu uliustnurrt systertIStuldllI(IJUSIIIWIII bv pus'h tton)

Needle gauge .... 3/32'N2.3tniint I/S3 175int). 512"

3!I(,'4 76nrn} 7 32"455 rnni, I/ 4"iP.3 5nllmr),q9;''"1v 1411111i) 5: lr'CZ9Srrl, 3/x"9.5 5 3mml K

l/fl"7! 4nluu), 5/S"1 I S.SC511ifr , 3/41l I= 905,1tinu

SW "22.225mm). ["(25.4mnP. I I/S'

2S 5 S5mm)h

I.I/4"1 31-%rmi. 13/ 8"l,.2 5 mI, I 2'"

Sewing hook ..... loriionita aIutoplntIc lLbricAtIlg hook forl high

speed {Singe:r 21I2 W ry pc)Lubrication Systeui A -utOinlalic system (lubrication by Iead plmIl

Molor................. 3phase. 400W (</21I) clutch nmotorlable ......... LII. 512 mjchie'talel L 51 - I able

Car) aIso b~e ist2

*Ilthere are followingsubclasses fi ll .. 512.

o LII 5l2 IISpec ifcat i'Is

1/sage ......... [ Heavy weigh I matertialThread.......... Ihick thread (vinylhu 5l orllereabouts)

Sewaing speed •. . Uip to 4,200 s,p rn,

]tQ'i aimnIufli h ikhiU~l 6I rl)nIl 15 4t

INodc: All other spc¢ivion~ilrs art iden:ticaJ; witlh I I 512)

0i LII §. 2 Speallt>,th~lls

[SeW JIIg ILI pee Up o (I)( }I <pl/m.

()IIId .. lit.....~ Ito needl Ice ;+SC

\INIi \l othgi SPCc~tUILii\ lb ll~IdLI;[iii III 12)

II. ORDER OF INSTALLATION & RUNNING THE MACHINE

1. ORDER OF INSTALLATIONIn s imvplily Iho istallatton work (to IS tfi~lo in er*Idr:

* L: ir 0 Iim!'sCall he usedi tor tl~ hW Nit~l DLIllol) Or e 0tin~ii~ate the

;.(il] (olllt rkLhhinhllg S ,hI~ll QI 1he' lat l highl "peedl srt Ing. use silecia l Y~LhhI)C

jicHles ; tiihed Wi h thIis+ naclhint.

Ic insta1 ll tese hinlges, care ti tile seats 1! thle ruhhbr Ihingt to tile [able

)II'JI i ieii (it a windIK ehliseqt/ orsqlre chisel toI lit etat ''udth anld heighi ofl

igtcs mltd Net litil s+ecurely with Iwo nails.

hinlut ]ling thle kne: Itiller

In> ill thet knee tilher o'n tie bac*k ot1:1we tale x~dhl csacl dinisions ;i

I I

'iW I

(3) Set the machine on the table arid as shown/ in Fig. 2, separate the rollerLiabout I mm (3/64") froml the Iever:2) andi attach the roller installing rod

(3). Then, set the knee lifter and select a good working angle.

m Agc

22

I ig. 2 Completely installed view ofthe knee lifter

(4) After thle knee lifteri s installed, loosen the screw A of Fig. 2, and as

shown in Fig. 3. low er the rolller fnstalhng rod, nnce, and insert tile oil res-

ervoir from the back side of t ie tahie,

i -

S4

(51 lulbngl lhe od lServotr

ihe nil reservfir wtijcb w ned Irrn Ihc trick side o he table stouldbe inlle]d as shownr in ]Kg. 4.

Bk sure that the '> ) art I hour cornlers of the oil reservelir .;: and( the

tipper su r face O the head st p port ru ,ber of OI hie fouLr u rnlers o I the groove

tl ebaltale re or same Iheight and set the oil reservoir with nad&s

l1g. 4

UPt Alter the oil res;ervoir is instlled, put thle nmachine back on the tableagain anld, ;is shiown in Fig. 2, separate thle roller tabout I nun (3/64)1 from

he lever 2 and set the roller inslafling rod :

2. MOTOR PULLEY AND BELT

Usea 3 . plase 4(10 W nolor Ithe bellisM Ntype Vbeht

Following table slows the" relationship betw~een the nmlber ot rotatlion ofthle mnachine with the rliinlenlsion of the ninitor pulley (effective diametert

N 3(titl1 CC ive, d ii

ycteI' ROttion lr¢ art No. ot mlotor puley o ______~ pll

,000 t,4TK P00)5000} 25$A00 MIlK PVO)0000 900 _

Sr 0,00 7v0oo 5i>

4,200 MTK--IV080000 856

(Note) For t he first month al. teCr purchase. operate lie nw chi e w~thI thesewing speed of undei 3.800 s. pm

During this period all essen tial parts will have become we U oiled upfor ideal sewin~g.

Before operating the machine, he sure to take follwing precautions:(I) FmI up the oil reservoir to the red line. Be sure to cover the hornt of 'be

oil reservoir with urethan~e foam inin tie accessory box)I to absorb running

sound and dust particles.(21 When the machine is to he used for the first time or when it was idle olra long time and is to be used again, drop 2-3 drops of oil hr hle oil hole ,

Fig. 5.

~]

Fig. 5

(3) Raise up the presser toot of the machin and run thle machine idly. Theoil will come up slowly to the oil gauge in alout S5 to 20 seconds. If thle oil

6

[ubC a lcd -

II I[ talkes Hore" lhan 30I sonds(II fr lhe oil to conklt tip to [he g:ituge af~ter

coriI]OLiu tile Frunnin1g. ins pecil th( following:

a. MIay he IIe oil supply is in ufficierit

h t, lh heilih of the oil reservoir properly installed?

(If lilt uretlan f}a is N compressecd to', much, [he oil does not comeI upI

iret[hatlt tfoaml md1c,¢ Ihe pumlp For ,o(tlt I clT X ] ciii (1 2>{4X2 )44).

Shen. lie oil will cinlc ip speedily.

III. HOW TO OPERATE THE MACHINE

1. LUBRICATION OF FACE PARTi ITheC lric ILaltonl of th ] ace part is a djisted al the ptrant so rlilirrinily it

w~otilt not he W~sLrY(~b+l Ii aJdiusi it. b)ut it eesr turnS',I tlit sh"ucw l Ig.

dl1 prK~l F adhtkt lmil

T he lubrication to [he lace part1 I dorne by oil wicks froml thIalt lI bush

rgig Of the' lircad take- up. (onseqtuenltly, nialthl amnt of oil is c:onstanll~y

supplied to Ihis part anti thcte is hartlly anly oil leadkage,

7-

To otai a onsant]Ublcaion doas follows:There are 4 oil! wicks from the shaft hushing of the thread lake-up. (Thewicks should be of dia, 3 mm (/81)

.2: Remove the face plate and when the machine is started and the oil comesup above the gauge line, be sure to verify that the oil is slightly creepinginto the oi[ wicks from the shaft bushing of the thread take-up.

3It will he dilly necessary for the screws of the oil adjuster uaider the bedFig,6) to be catching by about 3 -4 threads.

4Be sure to see that the tips of the aum inum pipes of the oH wicks arelust slightly contacting the needle bar crank rod or t he needle bar.

*To measure the oil a mountAs shown in Fig. 7 anid Fig, 8, contact a straw paper in1 the machine andlet the oil splash upoln it and let a strong light {sun1 s ray or elccl rio [amrp-stand ray) soalk through it cod let it come as near as Fig. 8 condition]This should he done by rutning the machine for about 5 seconds andstop for about S seconds and vontinur this for 2 minutes and during thisinterv.al measure the oil arnout stuck on the paper.

6 See to it that the oil conies up on the gauge within 20 seconds alter themachine starts trning. Also that the oil comes down within the gaugein about 55-60 seconds after the machine has stopped fnning

Fig. 7 H'g. 8

8 -

2. ADJUSTING THE OIL AMOUNT OF THE SEWING HOOK

I>

in adjusI he idl imounl ol ih& htmL nigluin the wcrew iz.i 9 to in-

crease e ni AU]~L! it d l0osen ]I to) decrestheI a]1 mnlt

3. HOW TO INSERT THE NEEDLES

V) ri s'ec'dlcs I)PX5 135X 5,134.797.1 340j1844,fl53W 14, lb oP

DPX7I 1 35x 7W 14, 10.2) For both right andl left needles. face tile long grootve> il hie needle to~wardl

nllgde lind Jlmetri thlem deep ito hie nleedle holes als lar as thley gto and c]lm/p

the'ml light with the needle clanmps. 4Fig. I0)

F'ig, If)

*,14 #60+ #$ oigtwih calicn fGabardine416 *40-o 60 Wool, gbardin e418 4L 30 #20 Vinyl leatherJ

4& THREADS (FIG. i1}

Fig. I I

It is ideal for thle needlet" hread, which is passed to lhe left needle as yo~u

face the mac hi ne, to be "righl~tw ist'"( I and the t hreadI whichI is patssed to

the right needle to be "left-twist'" (B). If needle thread of less twist or a

thick bhread of over *30 is used and above conditions are not met. needle

thread breakage might result. For the bobbin thread, IhoweJver, any twist

thread can be used.

5. PASSING THE NEEDLE THREAD

Pass the ne-edle thread in the order shtown in lig. 12.As you face thle machine, the left side needle thread should be passed fromJ. -. (Left thread tension disc.--*Iower hole of take-up*]left needle)

The right side needle thread should be passed, in order, Iror A ID L (]

(right thread tenlsion disc-'upper hole of take-up-4right needle).

............I0+

I29 4 4 3

.;1 j zg7Jo-/

6: D'

L F5

Fig 12

-ii

6. PASSING THE BOBBIN THREAD

Verify that when the bobbin thread is pulled out from the bobbin into thebobbin thread positioner, it has positively entered into the forked part ofthe thread tensiotn spring. (Fig. 13)

Fig. 13

7. REGULATING THE THREAD TENSION

T )1o produce ideal thread tensio~n, adjust the tension oC the needle thread-'right thread by dhe right thread tension r'u t tFig. 14 I an~d the left needlethread by the leit thread tension nut (Fig. 14 )1. Turn these nuts to rigbt tonmake the tension stronger and to left to make it weaker.

, /'(4'-

Fig. 14 Fig. 15

-12-

(2) For adjusting the tension of the bobbin thread .- left and right po sition-

ers, tighten the bhread tension screw (Fig. 5 ) to make i st ronger and

loosen it to make it weaker.

(3) Thread take-up spring

T'o make t he tension of the lake-up spring stronger, turn the shaft Fig. 16)

to lelt and to make it weaker, turn itto right. After this adjustment,

tighten the nut (Fig. 6 I securely. Normally, the strength ofl the spring

should be around 20 g and the moving range is 7 iinm 0h nm( 9/3 25/64,"

For e tre inc Iy light weight materials or for sy nthle tic fiber mate rials, make

the tension of the tdke-u p spring slightly weaker and make the stroke longer.

Po adjust the moving range of the take-u p spring stroke, loosenl the screw

(Fig. 17 ) and rove the stopper (Fig. 17 jto right to make it greater arid

to left to make it less.

Fig. 16 Fig. 17

8. ADJUSTING THE STITCH LENGTH (FIGi18)

Rouate thet hand wheel (Fig. 18 Z) while pushing the button (Fig, 181?

atop the bed surface and when the button has entered the groove, match the

gradutation figure with the indicator.

'3-

Fig. 18

IV. ADJUSTING THE MACHINE

1. MATCHING THE THREAD HANDLING DEVICE

Thet correct ma tc hed position is when the lower lie l the carved line ofthe needle bar (Fig. 19 I has ri.sen 2 mm (5/64" from the lowest point ol

the needle bar. and when it meets the bottom surlace of needle bar vibrating,base (Fig. 19 b te 2 carved lines should be matched with each other (Fig.

2W,.

Fig. 19 Fig 20

-14 -

2. ADJUSTING THE THREAD HANDLING DEVICE

As shlown in Fig. 2 I>at thle instant when the needle thread passes over the

re'ar groove of the needle plate. make adjustment so that thle thread handling

device ifig, 22.1:) will he in the position to open the bobbin thread position-

Cr iustl o tihe thickness fo the thread.- To do this, loosen thle thlread handlingset screw (Fig. 22 1) and after placing the thread handling device to tihe

normal position, l.ighten thle screws.

(z) ... . , !

Fig 21 .ig. 22

If the bobbin th read positione r is opented 01on wite the runi nng sou rid gets

bigger arid the life of the sewing hook will be shortened So. it should he

opened iust to the thick riess ot the usinlg th read,

3. RELATIONSHIP BETWEEN THE NEEDLE AND THE SEWING HOOK

( I Tdiig of hie needle and the sewing hook (Fig 23 A, B)Set the Ieed amlountl to urnli~ (5/64"1 and renmove thle throait plate.

o When the needle hits risen 2 m, 1torn the lowest position (Fig. 23 A),

O When the blade points ofl eft and right sewing hooks matched with the

center of needles 4Fig. 23 Bih,o The clearance bet ween the side of the needle and thle tip of the hook blade

is 005 mm (Fig. 23 B).o Height of the upper edge oif tit, needle eye and the tip ofl the hook blade

is 1.2mrai (3/64") (Fig. 23 A).

Fig 23 () -

(2) Matching the timing of the sewing hook

Fig. 24

This is adjusted by looscning the set screw (fig. 24 I ) of the smnai! gear

or the shaft of the sewing hook. After this adjustment, pull up the sewing

hook and lower the small gear to prevent the up and down rattle of the sew-

ing shaft and securely tighten the screw,

-16 -

4. ADJUSTING THE CLEARANCE BETWEEN THE NEEDLE AND

THE TIP OF THE SEWING HOOK (FIG.25)

Fig. 25

Make this adjustmnt in the following order:

a Remnove the presser root anld thle throat plate.

b, TllH the machine toward the rear of the table,

L oosen the hook slhatt base CIUJping screCw ot t he side to bt adjust tdRight side.......A AB.C

Left side . ... ABC'd, la p the sewing htok shalt base tightiy andl a djust if to the norIal position.

c. A tier tightening the respective A, 1 screws, tighten hemIl all again with C

sue 'WV

5. INSTALLING AND REMOVING THE SEWING HOOK

II1) To re'move thte sewing hook

a. Open tile slide plate.b> Raise up the presser foc t and remove thle I hroa t plate

c. Wi I, the hex agonal span ner in the accesso~ries (,ox, looseni thle 2 se I screws

(Fig. 26.1 ) of" the sewing hook.d. Rotate thle ha l~t wheel so that tihe needlec bar crimes to its Ilwest point and

take out Ihe sewing hoo}k u pwards.

(2) oisalbc the sewing hlook

a. Reverse the removing procedure.b. Rotate the bobbin thread positioner so that its protruding part enters into

the groove of [he throat plate arid install back the th[roat pla te

Fig. 26

6. ADJUSTING THE HEIGHT OF THE FEED DOG

The standard height of thle feed dog is, as shown in Fig. 2?.0.8 m mi 1/32')above the surface oif the throat plate. to adjust it to this height, loosen thescrew of tihe feed base.

Fig. 27

7. ADJUSTING THE FORE AND AFT POSITIONS OFTHE NEEDLE BAR ROCKING FRAME ROCK SHAFT

When the stitch length is set at "C", adjust so that at the position of 10mnm(25/64') from tie bottom surface of thle presser bar bushing, the clearancebetween the outer (cinference of the presser bar and the needle bar c'omes"to 13r5mmflT!32'')

This is the correct position. ( Fig, 28

Fig. 28(141 5-2I

I he ieat oship bet wen~i the need le hat rocking framne rock shalt and thefeed should be such that at any position of tbhe feed mot ion, the needleshould he at a bou I center ofl rinedle boole of thle feeddog.

To adjust tihe tore and aft post ions oft the ieed Ie bar rocking Ira me ock.shaft, loosel t he c aun ping scr tC(fig, 2¢ C) o I the nee die ba r rocking ceedarm (Fig,29l ) and match it with thle center ol ti1e needle hole of thle feeddog and the needle and securely tighten the screw.

If the needleI bar rocking rod (Fig.? 93)I sh 'id thit the at in lsen t heneedl toat rockinag a r m(rear) set se rew(i g 30 I> )before tightening thle needlebar rocktng teed arm screw and vibrate the needle bar rocking Iced arm hdllytoward flont..Ihen, after retigltenfing the needle bar rocking Jrmfrear) sohbit the clearance bet ween thle needle bar and ie pre'sser hat's outer cirtctim-terence comes to I 6.5 n oR 21/32'), ma v bittheposition of the needle eye-anadhe needle.

19

Pig. 29 Fig, 30

8. EXCHANGING THE TIMING BELT

VRemove the belt from the sprocket.

ft Remove thr hand wheel( remove the Ibearing with it).3 Pull out the belt from that hole and insert a new belt.

Be very earehul and don't bend the belt too much.

9, MATCHING THE TIMING BELT

When exchanging the hell or removing it. do as follows to match lheti fling of t ho mlaill sha ft and tile lower shaft:

Rotate I he maitn shaft toward the rotating direct ion and as sho wi in[ig.31I, when the needle conmes down and thle needle point fleets the uppet

surfaee of the needle plate, rotate Ithe lwer shaft toward the rotating direc-tion and match tihe spot of the iirst set screw] Fig.32 2") of the Lower sprocket

(l ig.32 ) with the indicating line(Eig.32 3) and put the hell on.

20 -

V. HOW TO PRODUCE IDEAL SEWING CONDITIONS

STANDARD SEWING SPECkFICATIONS

Th)7 kleNs 4[ * ktr Lm Nylon (Cot ton C~ or V fylonl

b~read =80 t60 tile id 80 I recad 50 g30

Sewving rnierial Lroaddotlh h oaddothl gabaxdtne g Iabardine 2 she i

2 Jl*eg 2 siict 2 shcets hcs I gct

Ntednuf [)PX7 t H I DP7 4 DX7. 4iIP7 1 )X .

nod hed 20p 2(I 3 0g 45 S0g 50 60 g 80 1 QIg

T Ien gioti 0o-15 2) 15 - 20g 25.Vig 2.M30 30-40g

hnliin tlltcad

tead ta ke-tLi 1 Sg 15I5 2 5 g 30g

Sroke or the 12m I2m 0m m m

thread take-lqp ~tS32 C.'5i" 125/64") '25164'') 532'

L' n pe I,0 3,801 4,200 4,2(1(0 4,0(0

LU- 5 ~1 .Pr Slm . p.i> . p ni.l 'pm,

LII -- 515 i3,500 3,500 3,500 3,510 3.500

R~pfl, S pIlh s~Pi. spi. spatn

21 -

*MALFUNC]I INS, RI ASONS & CORUI("JIIV MIEASLYRIYS

M a[fulc Liolns ReB All Corr~ tive measures

A. Th ead breakage (41 Whca te 4 hread path., 0 Kni I point o4 I he hook should

IThread ravels needle poin or the groove he" honed wi Ih a finle paper file;or wear ourt oth bobbin (hicad posi- groove Of the thlroat )late Thou Id

Stiuner behir d the throal be finished wit a bufl.

plate arc bruised

(21 When tilt teisslern A[ 0 Refer 0/ the chlapte or, ad-needle thread is too strong[ jesting iflv needle t h re~ad tenision

Refer to lit.

3;Whl, VlL thread p~ le Ol oosn the set screw of tihe hscrad

is Ipaling the hobbin thread thread handling dievice alid

ptisJlhlnl to~o intIcti bring it near the hook (Refer

to \.2

4Nee dle and the sew ing 0 Lightly tap Ihe hook shafl

honk are hi I ing ends 1u thet hu Thinlg and adjust the r~earatnce"~h I w eep n he needhe and the

kire tip R Ielti Lu IV-4)

W !hen oil su~pply to 0h Adjust 'he oil alslount to lie

seing hook is itiStllicienll sew~ing hook (Refer to tII--2)

2 Needle ted IKE When lie lensIon o4 the 0 Thi usuall y occurs Cnyfl e h

remains oin the i ne~edle thread is too weak itreads For synthetic thread,

back o/F tie lhe normhal ltmnsin of n~eedlesew ing clhth b thread is 20 g anri thebobbin

about 2 3 trn thread 15 g IRecr to 11-7)

and is brolken 2) S rerigth oh the thread 0 Weaken Ilhe strength of the

:+v lq/Y like-ti pnrng is too strong thread Lake-a p spring and rnrke

und the, stroke is air, sf1al W Ilhe stroke largr (Refer to 111-7--)

]3 When the inrc d diroc- 0 Jibe cros' sect'on view ot the

niorlO the neerdle is inc~orrect ncc'd

je ey e as view~ed tonsl~

l~spciajy o synheti aborte should look like thist

thrNdiI ery go od hor synthe ti

i lthre ad

h.@@Standard

Somnetinmeshed good lor thelltic"

4 hc~l~lmiJgb1 n ) cier B) V -3 1:~ OI t;idtlg

Maif n .n R- h i Ilo q1Lk hookiI1 h,,tWII! ncI CtlLl ci

5 hnthe (lling ot the U ligrt I' -. I

3. Skip-sfltchlun 1( hearnlce be'tween tile Reter to IV.4o

+IICLLIk i' IoU great the ice d> &tlt he ho(1(k knil>

>2 When he ,l ing~l: 5c 0Rft I V *h.l.3 c oi

t Ltln lhe }lsOk ind thL Matc hing the, [irnillc ofJ thldie is<LJ eit '[her t a list Or hotok wdih lhe n uw"dl

klei ' he t, ren r lOot C l igtct ci j'resser ou

4 '+When lie direction 'ifli' Ch 0 ecr tu\2insirte d needle is nelorreel

4>5 Wheat thec heigll Of the 0 d~LJ'( sol that w+hen hel~

nt di IbaT is raolI matchied nIUt Lilt bar1 s aI the' lowst'01111 5t Ott tl hat tJIL tipper

sarvt d line ot lhe needle her

suttcs.¢ 'I ths. neNIIC bj r

23

Malfuncetions JReasons C orrective neasu res

C.Stitchinglaw (0 When bobbin Itead 0 Refer tolIIWhen slihehing isnot in the forked rod ol Pass the thread to the torkedflaw occurs due to the bobbin case tensilon rod of lie Thread tension springchange of sewing springspeed.. from low !i" When the outer rim ot 0 Change the bobbin orto high speed the bobbin does riot glide polish It with a fine mesh paper

smoothly file

$Df]he 'prm of the takeaup 0 Refer to ll 7.;is too weak Make the lake~ip spiring

stranlge[(2) Ine tinn oflie lu-ead 0 Reler to IV -handling dev ice is not correc ihe it aeu f

®3 Tension of Ihe bobhin 0 Refer tolli 6 -(2)thread is too wleakTitnleta-ipsig

W hen the sewing hook isI 0 Exchanlge it with a newdefective Iesl ing hook

th read is too strong t hread tensionC Whzen the bobbin thread 0 Remove thle bobhii andSis woun Id too tau t rew~indle Ihe

h abobbin thread.

(Very frequent fr sy nthetic Iln so doing. weaken ie 'crew,

thr'eadst rA'of Ihe thread celii sia anld

4 /

®J When the pressure of 0 Loosen the plresser foot

the presser foot is too stronlg adjusting erew IV 3 - 3® When (he real" side of 0 Polish the rn side ofpresser foot dnoes glide presser toot with abuffsm1oothly no

24 --

Mii (~I nctions Reasons (orectivz neasures~

( When the feed dog s too 0 Match the feed dog a littlelow higher to prevent puckering.

(When it is returnled, make i

so that it will be 0.15 mmlower than the surfac-e orthroat plate)

[. Duritng sowing. (i) The imling of the thread 0 Adjni;I the thread handlingthe needle thread hanidlin'g deyice is nut proper device to iproper timing andhops up and down fix it so hlat thle thread will

roll out rlor the thread winderwith a fixed constantI spe~d(Refer to IV*2-

(29 When he prer or the 0ORefer o IlI 7 3 9

thread take-up spring is tol Make the pressure of the brleadweak take-up spring stronger

JUKI MODEL LH-5I5 INSTRUCTION BOOK

LH- 51]5 is a high speed, two-needle. lockst itch, needle feed industrial sew-

Ing machine with a reverse feed nlechanisrn.

Designed and constructed to sew at a high speed of up to 3,500 spilt aind

to strengthen the high speed and durability factors of modern industrial

sewing machines.

NOTE: WITH THE EXCEPTION OF SPECIFICATIONS LISTED BELOW,

ALL METHIOD OF OPERATION. AI)JUSTIMENTS, THREAD TEN-

SION ETC. ARE EXACTLY SAME AS T'HAT" OF JUKIt MODEL

LHI-5 12.

1. SPECIFICATIONS

Sewing type............ Two-needle, lockstitch, needle feed with reverse

sewing mechanism (by means of reverse lever)

Sewing speed............ Up to 3,500 spr.,

- 25-

2. MOTORPULLEY AND BELT

Use a o tv or 3-p husr 400 W. B s I -type V heI.Ihe' relatioushlp be'weerI the number ol rotaton of the mac'hine with the

dimlension ofl the motor pulley (eltective diameterl is at; lollows:

3N0 i K PV0SO000 $015 3>000 MTK l'V07000() 70 €,S3400 MT K -PVO6SO000 65

__{___ I I'0 NI 'IK P'V060000 J 0 #

((:auliol) For thlelirst nlrith, run thlenachint under the 3,000 spin speed.During this period, all essential parts will he adequately oiled.

3. REVERSE SEWINGMlodel LI- 515 is eq ipped withI a reverse" sewing n1 echa i~s it.When reverse sewing is to hr dorc push down the teel lever (Fig. 3

unltil it hits the stopper. As long as this lever is kept pushed down, themac hinec will do reverCse swing.

LIK- IUTKI

E ig. 33

26

4, SPECIFICATIONS FOR STANDARD SEWING

All spec lia tions for standard sewing are prac ticaI same as that oif

Lii 5~12 (Refer to the chapter V. oil hlow to produce ideal st itching condi-

ions) e' ce pt thle sewing speed which is 3,5(44) sp.min as cin pa red to I I 512

which is upj to 4,200 spl~in.

5. ADJUSTING THE FORE AND AFT POSITIONS OFTHE NEEDLE BAR ROCKING FRAME ROCK SHAFT

W¢hen the stitch length is .9ct at "0"', adjust so that at thle posititmno il 10ram25/64" fromn the bo[Ioi surPace Ol te prtss er bar bushing, tile clearance

hetwcvri the (tuter circu~feren~lce ii the pre'sse~r bar intl the: iedle* bar co3mesto 14mt l 5 /64"I.)*[his is tie cur rec t position. (ig44

T he methol/d al~tlstr nnt is sane is III 512.

Fig. 34

2-

6. ADJUSTING THE MAXIMUM STITCH LENGTH

When the stitch length does not come to the desired maximlum length,make adjustment by moving the feed controlling plate(Fig.35(V)

When the normal feed amount is too small, knock the machine Lowardrear, loosen the 2 set screws( Fig.35K2A) of the feed controlling plate and moveit upwards. Conversely, if it's too large, move it downwards and securelytighten the screw.

Use a paper for measuring the stitch length. Set the feed a mount to themaximum, rotate the machine with your hand and measure the distance of1 ] stitchings.

To adjust the amount of reverse feed. change the height of the adjustingscrew(Fig. 35 (3:) attached to the feed controlling plate. T'o increase thisamount, loosen the nut(Fig.354: and rotate it to right and to decrease theamount, rotate it to left.

FPg. 35

7. EXCHANGING THE TIMING BELT

Remove the feed lever shaft. First, knock down the arm and loosen thle2 screws of the arm which is attached to the feed lever shaft. TIhen, removethe push screw which is attached to the opposite side of the lever and withthe lever and the shaft inl connected condition, pull them out to right.

All other procedures are same as Model [H--S 2.

- 28 -

AM 512 Bk2R Pried in IapfT)