JUKI MO-6000S Series Engineer's Manual
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JUKI MO-6000S Series Engineer's Manual

JUKI MO-6000S Series Engineer's Manual

Supermhlghcspeed overlock machine high.speed overlock machine/ safety stitch machine / highcspeed variable top feed overlock machine
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Super
HlghcSpeed Overlock Machine
m
High.Speed Overlock Machine/ Safety Stitch Machine
MO--60 S series
MO-6900G series
HighcSpeed Variable Top Feed Over1ock Machine
M
M
900J series
EN INEER'
Rseries
(for Extra"heavy"weight Materials)
(for Extra-heavy-weight Materials)
N_/il L
29355801
=,., , ,
No,E350-01

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Summary of Contents for JUKI MO-6000S Series

  • Page 1 Super HlghcSpeed Overlock Machine High.Speed Overlock Machine/ Safety Stitch Machine MO--60 S series MO-6900G series (for Extra"heavy"weight Materials) HighcSpeed Variable Top Feed Over1ock Machine Rseries 900J series (for Extra-heavy-weight Materials) EN INEER' N_/il L 29355801 =,., , , No,E350-01...
  • Page 3 PREFACE This Engineer's Manua! is written for tht:1 technical pe1•sonne! who are mcnn , n cil h lo for the serv!Ce and maintenance of the machine" The Instruction M anual for these machines intended for the maintenance personnel and operators at an apparel factory contains operating instructions in detaiL And this manual describes "Standard Adjustment", "Adjustment Procedures", "Results of Improper Adjustment", and other important information which are not covered by the instruction Manual.

  • Page 4: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ..................... 1 (1) MO-6700S SERIES ......................1 (2 ) MO-6900S SERIES ......................2 (3) MO-6900G SERIES ......................3 (4) MO-6900R SERIES ......................4 (5) MO-6900J SERIES ......................5 2. MODEL NUMBERING SYSTEM .............."···· 6 3.
  • Page 5 ( 211 ) Ad j usting the thmat p late su pp ort ............, .., .. , ..... 34 ( 21 ) Ad j ustin g the feed mechanism cm,er p resser ...., ...., ...., ..34 ( 22 ) Ad j usting the loo p er cover ............

  • Page 7: Specifications

    Provided as sl:: m dard Micro presser lifting device 2P 550W (In case o/7,000 rpm) Motor 2P 400W (in case of less than 7,000 rprn) * JUKI MACHINE OIL 18 (Equivalent lo ISO VG 18) Part No. : MML018900CA (900 m 1)

  • Page 8: (2 ) Mo-6900S Series

    Provided as standard - ------ Motor 2P 550W (In mse of not less than 7,000 rpm) 2P 400W (In case of less than 7,000 rpm) * JUKI MACHINE OIL 18 (Equivalent to ISO VG 18) Part No, : MML018900CA (900 m €)

  • Page 9: Mo-6900G Series

    Provided as standard (Excluding some of subclass machines) Needle thread heat remover Micro presser lifting device Provlded as standard ·- Motor 2P 400W * JUKI MACHINE. OIL 18 (Equivalentto !SO VG H!) Part No. : MML018900CA (900 m i )

  • Page 10: Mo-6900R Series

    -------- Motor 2P 550W (In case of not less than 7,000 rpm) 2P 400W (In r, a se of less lhan 7,000 rpm) * JUKI MACHINE OIL 18 {Equivalent lo ISO VG 111) Part No. : MML018900CA (900 m £)

  • Page 11: Mo-6900J Series

    Needle cooler Provided as standard (Excluding some of subclass machines) Needle thread heat remover ..Provided as standard Micro presser lifting device 2P400W Motor ' JUKI MACHINE OIL 18 (Equivalent lo ISO VG HI) Part No. : MMUl18!lOOCA (901.l m £)

  • Page 12: Model Numbering System

    2. MODEL NUMBERING SYSTEM MO-6000 SERIES MODEL NUMBERING SYSTEM 131415 16 17 18 19 20 21 22 M06DDD[][J[]D D DD/[]DDD-LJI-ID 5. 6 Seam code 4 Machine code 8 Needle gauge wde Splicing 6700 series 1--needle 1--needle 3--thread overtock (504) 6900 series 2_ o mm For blind hemmong (505) 2.4mm,...
  • Page 13 13 Special machine code Special classification of machine, structure and specification other than gauge set - - ---- Standard ---- Feed dog provided with a lip Upper looper high throw type - - - -- For swim suits Upper looper extra high throw type Forzipper For splicing 15 to 18 Device and attachment code...

  • Page 14: Standard Adjustment

    3. STANDARD ADJUSTMENT Standard Adjustment (1) Adjusting the needle height When the needle(s) is in the highest position, the needle height from the throat plate surface should be as shown below. Mode! 1-need!e/ 2- - needle: right (Unit· mm) 2-need!e: feft 6/\04!\ MO- 6 04S(R) - 10.5...
  • Page 15 Adjustment Procedures Results of Improper Adjustment o Any other needle height than 1) Take off the upper cover, loosen setscrew 8 of needle driving specified here will badly affect forked crank O and move needle driving forked crank O up or the action of the lower looper, down to adjust the needle height the timing for catching the upper...

  • Page 16: Installing Position Of The Needle Clam

    Standard Adjustment (3) Installing position of the needle clamp Needle clamp connecting stud O should fit with the bottom end of needle bar 8 or spaced within O to 0.5mm. Oto 0.5 mm Butt the needle clamp with the bottom end of the needle bar. (4) Adjusting the length of the lower looper holder (Applicable only to M0-6 16S / M0-6916R, G, J series) The center-to-center distance should be 26 mm.
  • Page 17 Adjustment !'mcedums 1) Loosen setscrew 8 and adjust, by slightly turning needle clamp o If tho clearance provided 0, the clearance provided between the right-hand side needle between the needle and the and the lower looper (f o r 2-needle overlock machine) and the looper is excessive, the needle thread will be likely lo skip al the clearance provided between the needle hole in the throat plate...

  • Page 18: Adjusting The Lower Looper

    Standard Adjustment (5) Adjusting the lower looper 1) Returning amount of the lower looper The distance between the blade point of the lower looper and the center of the needle should be as follows when the lower looper is at the extreme left of its stroke. (Unit: mm) Model Dimension lfD...
  • Page 19 r-------------------- - - ---- ---- -- ------------ ---1-- ------- - - - --------" o Excessive rnturn of the lower 1) Returning amount of !he lower looper (1) Loosen setscrew f) of lower looper support arm O and adjust looper tends to cause stitch skipping when filament thread is lower looper G to make adjustment of the returning amount used.

  • Page 20: 6) Position Of The Up P Er Loo P Er Guide

    Standard Adjustment (6) Position of the upper looper guide Vertical position (Unit : mm) . . tfi ' To be in close contact with the frame guide surface_ ·t1i laternal position To be pressed against the upper looper guide support g auge•- Upper looper...
  • Page 21 Results of Improper Adjustment Adjustment Pmcm:lure5 o If the upper looper guide has 1) Fit upper looper guide support gauge O over gauge fixing pin improperly positioned vertically, @ which has bflen driven in frame O and secure the gauge it will cause oil leakage or with an O ring.

  • Page 22: (7 ) Positioning The Upper Looper Holder

    Standard Adjustment (7) Positioning the upper looper holder The distance between the bottom surface of the frame and the upper end of the upper looper holder pin 8 should be as shown below when the upper looper holder O is at the highest point of its stroke_ (Unit: mm) Model Dimension f)

  • Page 24: 8 ) Positioning The Upper Looper

    Standard Adjuslmen! (8) Positioning the upper looper 1) Height of the upper looper The distance between the throat plate surface and the blade point of the looper should be as follows when the upper looper is al the extreme left of its travel. (Unit: mm) Dimension W Model...
  • Page 25 o If the upper looper has been 1) Heigh! of the upper looper positioned too high, an Set a hexagon screwdri v er onto setscrew@ at the end of upper excessive clearance will be looper bracket to adjust height @_ produced between the upper GD When adjusting the height, pay attention also to the clearance looper and the needle"...

  • Page 26: 9 ) Ad J Usting The Double Chain Looper

    Standard Adjus!men! (9) Adjusting the double chain looper (Applicable only to M0-6 16S/6916R, G, J series) 1) Returning amount of the double chain looper The distance between the needle center and the blade point of the double chain looper should be 15 to 2 mm when the looper is at the extreme left of its travel.

  • Page 28: 10) Adjusting The Hei G Ht And Clearance Of The Needle Guard

    Standard Adjustment (10) Adjusting the height and clearance of the needle guard 1) For 1-needle or 2-needle overlock machine Make needle guard G lightly come in contact with the top end of needle (bend needle by Oto 0.05 mm) when the blade point of the lower looper reaches the needle center. The clearance between needle guard @ and the needle is 0.1 mm when the needle is at the lowest point of its stroke.
  • Page 29 1) For 1-needle or 2-needle overlock machine o Excessively close contact between the needle guard G and the (I) A dj u st needle guard G with setscrews O in the needle guard needles will lead to needle bend so that it lightly comes in contact with the n eedle (bend needle or stitch skipping.

  • Page 30: 11) Adjusting The Height Of The Feed Do G

    Standard Adjustment (11) Adjusting the height of the feed dog The height of main feed dog 8 from the top surface of the throat plate O should be as follows when it is at its highest posion. (Unit - mm) Needle A Model Dimension A...

  • Page 32: Adjusting The Differential Feed Ratio

    Standard Adjustment (13) the differential feed ratio Adjusting MO-6000S, R Serise Pin at its highest Pin at its position Washer lowest · 1 1- Center - position of nut Lower marker line 1 � (Max, stretching) gathering) (Standard) (Max, Gathering: 1: 2 Gathering: Gathering: 1 •...
  • Page 33 1) Remove cover O on the rear of the frame and loosen main feed pin and nut 8. 2) Move main feed pin (9 up or down to adjust the differential feed ratio. 3) Adjust so that the lower engraved marker line on main feed rocker G aligns with the center of nut@.

  • Page 34: Adjusting The Presser Foot

    Standard Adjustment (15) Adjusting the presser foot 1) Adjusting the tilt of the presser foot The presser foot should be positioned so that the feed dogs go down under the specified presser foot pressure, and the presser foot sole comes in contact evenly with the throat plate surface . . Throat plate 2) Adjusting the micro-lifting mechanism of the presser fool r---- ____...
  • Page 35 Result,; of Improper Adjustment Adjustment Proced11rns o Uneven contact will result in bad 1) Adjusting the till of the presser foot straight material feed, weak feed (1) Tum the handwheel and place the feed dog in the position power, or puckering, where the feed dog does not jut out the top surface of the throat plate.

  • Page 36: (16 ) Positionin G The Upper Knife Arm Shaft

    Standard Adjustment (16) Positioning the upper knife arm shaft The upper knife shaft should be positioned 34 mm above the top surface of the throat plate when it is at its highest position. MO-6/\ 16S(R)-F /\6-60H : 35 mm (17) Positioning the upper and lower knives, and available overedge widths 1) lower knife 2) Upper knife 3) Overedging width...
  • Page 37 Adjuslmenl Proced,m,s 1) Remove !he upper cover, loosen setscrew @ in upper knife o Improperly positioned upper driving arm 0, and tum upper knife shaft Oto adjust the position knife arm shaft will come in from the top surface of the throat plate to 34 mm, contact with the frame, If it is moved with the position of (Caution) Be sure lo fully lighten the selscrew since upper...

  • Page 38: 18 ) Resharpenin G Of The Knife

    Standard Adjustment (18) Resharpening of the knife Lower knife gauge Part No. 11996907 {19) Position of the thread cam (Applicable only to M0-6 16 series) 1) Adjustment of lhe thread cam Level -------��/ 16,\ M0-6/\ series ·�· 2) Adjusting looper thread cam thread guides A and Band the looper thread cam nail �...
  • Page 39 Adjustment Prm:edums o If the 1 O" angle of lhe lower knife 1) When the knives have become dull, fully resharpen lower knife is exceeded, the durability of the 0 until the contact mark of ii disappears. knife will be deteriorated. often 2) When the upper knife has become dull, replace it with a new resulting in blade chipping.

  • Page 40: 211 ) Ad J Usting The Thmat P Late Su Pp Ort

    Standard Adjustment e---- - ----------- --------------- (20) Adjusting the throat plate support (21) Adjusting the feed mechanism cover presser (22) Adjusting the looper cover o The looper cover should smoothly close without coming in contact with upper knife O when slowly closing looper cover@ with upper knife O in its lowest position of its troke.
  • Page 41 Adjm,!m,mt Procedt!l' !! S Resulls of !mpmper • "''· -------- loosen setscrews O and adjust so that throat plate support@ If the throat plate support comes in single sided contact with the should not come in single-sided contact but come in uniform contact with throat plate 8 using setscrews @.

  • Page 42: 23 ) Ad J Ustin G The Cloth Chi P Cover

    Standard Adjustment (23) Adjusting the cloth chip cover o When cloth chip cover O is pressed away from you, it should not rattle. In addition, the cloth chip cover should not come in contact with upper knife O and lower looper e. (Located inside)
  • Page 43 Results of Improper Adjuslm,mt Procedures Loosen setscrew 0 and temporarily tighten the selscrew with cloth chip cover stopper 0 raised. Loosen setscrews@ in the cloth chip cover, and adjust the longitudinal position of cloth chip cover O. 3) Loosen setscrew 0 in the cloth chip cover stopper again, and press cloth chip cover stopper (ill downward until the stopper slightly comes in contact with looper cover@.

  • Page 44: 24) Ad J Usting The Needle Mechanism

    Standard Adjustment (24) Adjusting the needle mechanism 1. Disassembling 2. Adjustment , ..a � . . : . -:" : : (It should not stay inside the Chamfered portmn should be positioned inside.
  • Page 45 1. Disassembling 1) Remove top cover@ and side cover@. 2) If packing Ci) of the top cover has been adhered on the frame, also remove packing Ci). 3) Remove needle front plug tl. 4) Loosen setscrew €1!) of needle lubricating pin 8 and remove needle lubricating pin G.

  • Page 46: Setting The Lubricating Pin

    Standard Adjustment (25) Position of the upper looper lubricating pin 1) Orientation of the lubricating pin Oil inlet 8 of upper looper lubricating pin O should face upward. 2) Setting the lubricating pin The clearance provided between upper looper lubricating pin O and upper looper bracket O should be 0.15 mm.
  • Page 47 1) Orientation of !he lubricating pin o If the oil inlet does not face (1) When upper looper lubricating pin O is set with oil inlet fdi upward, oil will not be fed faced upward, lubricating hole O is in the lower section as resulting in seizure.

  • Page 48: ( 2!Ii ) Ltm !Ll Itudinal M@Mentum Of The To P Feed Do !Lj ( To P Feed Amm.m1T )

    Standard Adjustment (26) Longitudinal momentum of the top feed dog (Top feed amount) Longitudinal momentum (top feed amount) of the top feed dog is possible up to 7.5 mm. Longitudinal momentum (top feed amount) Ma x. Min . Standard 7.5mm __ _ _ _ M0-6916R-FNk\[,H 2.5mm...
  • Page 49 1) Changing the longitudinal momentum (top feed amount) o It the min. stroke is decreased of the top feed dog to 1 mm or less, the components G) Loosen top feed lock nut • and move lop feed lever in the mounted inside the machine direction of the arrow mark.

  • Page 50: 21 ) Vertic.1I M@Mentum @F The To P Feed Do G

    Standard Adjustment (27) Vertical momentum of the top feed dog Relation between the position of vertical adjustment pin and the vertical momentum Vertical momentum Application Adjusting position Striking to end of groove. 3.5mm Ught weight material --------- Marker line position A 5.0mm Light- to medium-weight materials Medium- to heavy-weight materials...
  • Page 51 1) Remove the top cover, locus cut base 41) and exhaust slot o When the position of vertical support adjustment pin @ is changed, 2) Loosen vertic, a l adjustment nut O and move vertical adjustment the vertical momentum of top pin 8 to a proper position, feed dog changes, o When vertical adjustment pin Q...
  • Page 52 Standard Adjustment (28) Adjusting the height of the top feed dog Adjusting the position of lowest point of the top feed dog It is standard that the top feed dog is 1.0 mm (safety stitch machine : 0.8 mm) from the top surface of the throat plate when the top feed dog is in the lowest point of its stroke.
  • Page 53 Results of o When top feed dog is installed 1) Loosen setscrew O in the top feed dog and move top feed dog higher than the standard @ up or down to adjust the height (Caution) 1. Perform the adjustment in the slate that the Sewing of heavy-weight standard top feed pressure is applied.

  • Page 54: 29 ) Locus Cut Of The To P Feed Do G

    standard Adjustment (29) locus cut of the top feed dog Locus cut mechanism makes longer the section where the feed dog actually feeds cloth by leveling the lower side of the locus of top feed dog motion. By this mechanism, the effect of prevention of irregular stitches can be obtained when sewing materials thicker than medium­...

  • Page 56: 31) Ad J Ustin !Lj The Lateral P @Sition Of The To P Feed Do G

    Standard Adjustment (31) Adjusting the lateral position of the top feed dog Clearance between top feed dog and presser is 0.2 mm. a' (0.2 mm) b = b' (0.2 mm) Top feed arm C (Caution) 1. Adjust the position only when there is a concrete problem that presser O and top feed dog G come in contact with each other and noise occurs, the left and right clearances are excessively different from each other and trouble occurs, etc.

  • Page 58: 32 ) Position Of The Motion Of The Top Feed Do G

    Standard Adjustment (32) Position of the motion of the top feed dog Adjusting the position of the motion of the top feed dog Loosen the setscrew in horizontal arm A O and move the position of horizontal arm A O to change the position of the motion of the top feed dog.
  • Page 59 o Intermediate constant 1) Make horizontal arm AO in the state of temporary tightening, turn the handwheel and adjust the top feed dog to the position where ii is desired lo be constant 2.) At the position, tighten horizontal arm AO at the position where the top feed dog does not move even when the top feed lever is moved.

  • Page 60: 33) Ad J Ustin !Ll The Feed Bar G Uides A And 8

    Standard Adjustment (32) Position of the motion of the top feed dog 1. The position of motion is adjusted to rear constant for 50H and 60H series and MO-6900J, and to intermediate constant for other models at the time of delivery so that the, best locus suitable to the purpose of use can be obtained.

  • Page 62: 34) Ad J Ustin G The To P Feed Do G P Ress11Re

    Standard Adjustment (34) Adjusting the top feed dog pressure <Standard height of top presser adjusting screw> Dimension A Vertical amount of Max. sewing speed top feed dog 7,000rpm 24to25mm Less than 6.5mm MO-6900R 20.5 to 21.5mm 6.5 to 8.5mm 7,000rprn 8.5mm 6,000rpm MO-6900J...
  • Page 63 Loosen top presser adjusting screw nut 0, when tightening top o When top feed dog pressure is excessively low presser adjusting screw@, the top feed dog pressure is increased and feed force is increased. After the adjustment, be sure to tighten Top feed dog jumps and noise becomes large.

  • Page 64: ( 36 ) Hei G Ht Ofthe Presser ( P Edal O P Eration )

    Standard Adjustment (36) Height of the presser (pedal operation) Height of the presser from the top surface of the throat plate when the presser goes uo to the highest point (Unit: mm) ----- Model Height of presser A (Max.) 7 .. ' -0!!4 -6904R -300...
  • Page 65 ..-·- - - - - - --1 1) In the state that the presser pressure is applied, loosen presser o When the height of the presser turning lock nut 0 and adiust the height with presser lifter turning is excessively low, entering or setscrew C, so that the height in the list is obtained when taking out of cloth becomes...

  • Page 66: ( 3 7 ) Lifting Amount Of The To P Feed Do G { When The P Resser Liftin G Lever Is Operated )

    Standard Adjustment (37) lifting amount of the top feed dog (when the presser lifting lever operated) It is the standard that the height from the top surface of the throat plate is 9 ± 0.5 mm when presser lifting lever 0 is pressed at the lowest point of the needle bar and tap feed dog f) goes up to the highest point.
  • Page 67 ± 1) Remove cloth base side cover 8 and top feed cover @. o When the lifting amount of top 2) Bring the needle bar to the lowest point of its stroke and keep feed dog @ is excessively high, top feed dog Oat the height of 9 i 05 mm (MO-6900J : 10.5 contact of top feed square block 0.5 mm) from the top surface of the throat plate.

  • Page 68: 38) Position Of The Thread Guides And The L@O P Er Thread Take-U P S

    Standard Adjustment (38) Position of the thread guides and the looper thread take-ups MO"6 14S ( R ) MO-6 16S ( R ) MO•6 Needle thread take-up lever of 2-needle machine Needle thread take-up lev e r of Needle thread guide Needle thread takew double­...

  • Page 70: 39 ) Ad J Ustin G Soft Chain Makin G Mechanism

    Standard Adjustment (39) Adjusting soft chain making mechanism 1) Replacing the parts with those exclusively designed for making soft chains 0 Needle thread presser plate C ..12112504 8 Driving cam ..... 12112603 0 Needle thread pmsser spring B ..12112702 G Throat plate ..

  • Page 72: ( 40 ) Position Of The Thread G Uide§ And The Loo P Er Thread Take-U P § Of M0-6900G { J )

    Standard Adjustment (40) Position of the thread guides and the looper thread take-ups of MO-6900G(J) MO-6904G (J) MO-6914G (J) MO-6916G (J) Needle thread take�up of Needle thread 2-need!e machine Frame Frame · 1 6.5mm 15mm le thread Needle thread Needle thread take-up of' double­ Needle thread guide chainstitch machine...
  • Page 73 M0-6904G {J), 6914G (J), 6916G (J) M0-6905G M0-6903G (Caution) The upper looper lhrea,!-take-up (right) and the looper thread take-up (left) shall be positioned al the extreme right point of the upper looper. (Unil: MO-69D4G ( J ) -0F6 - 700 M O-691 6 G { J)-F 6•-700 j_ _____ [\/1 _ �...

  • Page 74: Additional Information And Precautions

    4. ADDITIONAL INFORMATION AND PRECAUTIONS (1) Thread tension 1) Strength of tension spring Colar Part No. Natural length Operating Weight required to compress (mm) length (mm) spring to working length 11550100 Pur p l e 19.5 mm 11.5 mm 8.92±0.49N (910 ± 50 g) 11550209 Green 19.5 mm...

  • Page 75: 2 ) Up P Er L@O P Er

    (4) Caution in assembly 1) Application of sealant (1) Setscrew of the throat plate base (B) retainer f) (JUKI seal) Apply the sealant only to the right setscrew. (2) Bottom surface of the upper looper guide support 8 (Three-bond 1104) Apply the sealant to lhe bottom surface of !he upper looper guide support @I, which contacts with the frame surface.
  • Page 76 Portion ol the setscrews of the d11"!-r1m:11 rubber· case (JUKI seal) Apply the sealant to the oil shield case setscrnw O (1 pc.) and the dust-proof rubber case@ setscrews (4 pcs.) �� �� '-- � , " � jrQ �...

  • Page 77: Precautions To Be Taken Wilh Res P Act To 1He Lubricatin G Com P Onents

    1104 Three Bond 1212 JUKI exclusive part Nos. of the above 3 kinds of the sealants are not set 2) Precautions lo be taken with respect lo lhe lubrk:ating components Feed bar components o Be careful of the orientation of the oil shield rubber 8 and lhe dust-proof rubber 0.

  • Page 78: 5 ) Kinds Of Motor P Ulle Y S , Belts And Frame Sup P @Rt Plate Bolts

    {5) Kinds of motor pulleys, belts frame support plate 1) Motor pulleys and bells MO-6/\00S(R) 60 Hz 50 Hz Sewing speed of V�be!t sewing machine V-·belt Outside diameter Outside diameter of motor pulley of motor pulley ( rpm) Semi-sunken Fully-sunken Semi-sunken Fully-sunken mm (Effective...

  • Page 79: 6 ) Ins P Ection And Re P Lacement Of The Cartrid G E Filter

    2) Pat No. of frame ,mpport plate boll Semi-sunken type Support plate boil. (A) 1;)155007 Locknut NS6240630SE Washer WP1002036SE Spring washer WS1002560KR (2) Fully--sunken type Support plate bolt (C) 13155106 Support plate bolt (D) 13155205 Locknut NS6240630SE Washer WP1002036SE Spring washer WS1002560KR -·...
  • Page 80 --- ----------- -----...

  • Page 81: Adjustment Of The Needle Height And Looper Timming

    5. ADJUSTMENT OF THE NEEDLE HEIGHT AND LOOPER TIM MING (1) M0-6000 SERIES Oescnrl,cm I Needle �e,ghl Uope, I Doper cmnpo�enis t- t'll!l!lcile 2· needle Lower !oo�er wrnoanents 3-rp>ed!e Dowbi<ce-chBin !oa��, fY!eslock civerlo,;: k safetY stlt,;:h 1-�eedle 2-needle Upper_lanper Pmject•oo oi Heegn: of P'�...
  • Page 82 6. TROUBLES AND CORRECTIVE MEASURES Trouble Case (1) Case(2) Check and Corrective measures Page ·1. Needle thread breakage Threading The thr��dis-�iangled with the thread guide. nr they Refer lo the threading diagram. machine head has been incorrectly threaded_ Thread path Scratches, burrs or rust on the paw!s or needl e hol e s of Remove such scratches, burrs, etc_ and perform thread ] I the throat plate, stitch tongue, lower l o oper, double chain...
  • Page 84 Trouble Case (1) Case(2) Check and Corrective measures Page From the previous page H• �f--J[ . 1c_ N _ e _ e _ d - e_ g _ c _ a _ c _ d _ s _ _ _ _ _ _ _ _ _ _ _ _ A needle gua �...
  • Page 85 Trouble Case (1) Case{2) Check and Corrective measures Page From the previous page ---- - - - - ---��� The needle has incorrect height and does not properly f------1 Refer to the related Standard Adjustment. _H_e-i g -h-, t "o - f-, e_ e _d _ ! e - 8, 12 I pick up loops even if the !coper has a correct return...
  • Page 86 Trouble Case(2) Check and Corrective measures Page Case 7. Upper iooer thread stitches are skipped � Threading -�[ The thread has been entangled with a thread guide. 1.-.-[ See the threading diagram. j Threading has not been done correctly. �----------------� j The needle does not take the upper looper Needle height The needle, if positioned too high or low, may fail to...

  • Page 87: 1 ) Semi-Sunken T Yp E

    Trouble Case (1) Case(2) Check and Corrective measures Page From the previous page I� - --- - }--! U Adjustment of looper Clearance or returning amount is not correct Refer to the related Standard Adjustment. Thread tension !-! The thread tension is too high, preventing formation of Reduce the tension.
  • Page 88 Trouble Case (1) Case(2) Check and Corrective measures Page ! 10. Triangie double chain needle thread stitches Double chain looper The chain looper is too high and too close to the throat �� Correct the height of the chain iooper by pushing it down I plate, or has bad shape.
  • Page 90 Trouble Case (1) Case(2) Check and Corrective measures Page l---· 13. Over!ocking needle thread is loose. , Position of the needle thread take-up guide and They are positioned too high, and the thread take-up �--{ Refer fo the pertinent Standard Adjustment. I •...
  • Page 91 Trouble Case Case{2) Page Check and Corrective measures }- - J, The looper thread tension is not enough. I 16. Uneven double chain stitches · t Slightly increase the tension. �� j ======= ===== f---r-l Presser foot Make the presser foot come into contact with the ihroat I he presser foot comes into contact with the throat piste i I I •...
  • Page 92 Trouble Case (1) Case(2) Check and Corrective measures Page 20. Uneven material feed ! Presser foot pressure The presser foot pressure is ioo high. Reduce the presser foot pressure except for the uneven I material feed due to packering. '�- - - - - - - - - - - - - - - - - �...
  • Page 93 Trouble Case (1) Case(2) Check and Corrective measures Page Fram the previous page i Presser foot pressure The presser foot pressure is not high enough, providing Increase the presser fool pressure. i poor ironing effect J-· - -1 �------ -----� Differential feed ratio The differential feed ratio has been set for gathering.

  • Page 94: Dimensions Of Table

    !1111� '11111 ,.,, •� " \ ,I I '- I � I "' !J:'- �1�1 ...i'"L- � JUKi l�gofype 1806) 6.Q!l_ Top of1aNe .J;: •" Type Holvot;c,, Ro�. CondonsoO Coo<l•c.s�<i vo[oe<I le1t•"' \ (�26) .:::;,�::;,� ::::::: '"i v "' �...
  • Page 95 ~· - } § � , c � j- M1 il I··. - � .. ! § 1 · - - -- - 1 - _L --·- - . - . • � · r - , . • . � .
  • Page 96 FAX c (81)3-3430-4909 • 4914 • 4984 The @ascrlptio11 covered in B'.hls enginee•'$ mai-n11a11! fis sub]ect hll dtl!lillg& for Bmwmovemeni of the TELEX : J22967 oommodlty without reot!r.:e. Copyright@ 2002 JUKI CORPORATION, AH rights reserved throughout the world, 02 • m Printed in Japan (E)

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