JUKI LK-1903A-305 Instruction Manual
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JUKI LK-1903A-305 Instruction Manual

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ENGLISH
INSTRUCTION MANUAL
LK-1900A
LK-1901A
LK-1903A
LK-1902A
LK-1903A-305

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Summary of Contents for JUKI LK-1903A-305

  • Page 1 ENGLISH LK-1900A LK-1901A LK-1902A LK-1903A LK-1903A-305 INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    CONTENTS 蠢 . EXPLANATION OF LK-1900A, COMPUTER-CONTROLLED HIGH-SPEED BARTACKING MACHINE ..............1 [1] SPECIFICATIONS ..........................1 [2] CONFIGURATION ..........................2 1. Names of main unit ............................2 2. Names and explanation of switches on the operation panel ............... 3 [3] INSTALLATION ............................4 1.
  • Page 3 [9] OTHERS ............................... 45 1. Setting the DIP switch ........................... 45 2. Table of the standard pattern specifications ....................46 3. Table of the standard patterns ........................47 4. Table of the work clamp foot ......................... 49 5. LK-1900 data ROM ............................51 6.

  • Page 4: 蠢 . Explanation Of Lk-1900A, Computer-Controlled High-Speed Bartacking Machine

    !. EXPLANATI�N �� LK�1900A� C�MPUTER�C�NTR�LLED HIGH� SPEED �ARTACKING MACHINE [1] SPECI�ICATI�NS ) Sewng area ..........X (lateral) drecton 40 mm Y (longtudnal) drecton 30 2) Max. sewng speed ........* 3,000 st/mn (When sewng ptches are less than 5 mm n X-drecton and 3.5 mm n Y -drecton.) 3) Sttch length ..........

  • Page 5: Configuration

    [2] C�N�IGURATI�N 1. Names of main unit 1 Machne head 2 Work clamp feet 3 Thread stand 4 Operaton panel 5 Power swtch 6 Control box 7 Pedal swtch － －...

  • Page 6: Names And Explanation Of Switches On The Operation Panel

    2. Names and explanation of switches on the operation panel 1 “Ready” key 8 Item selection LED LEDs of the selected tems lght up. Ths key changes over the settng state from the panel to the sewng state where the sewng machne actually operates. 2 Sewing LED Pattern No. X scale Y scale Ths LED goes off at the tme of settng state and lghts up at the tme of sewng state.

  • Page 7: Installation

    [3] INSTALLATI�N 1. Installing the electrical box Install the electrcal box on the undersde of the table at the locaton llustrated usng round-head bolt 1 , plan washer 2 , sprng washer 3 and nut 4 suppled wth the machne, and usng bolt havng hexagonal ndentaton on the head 5 , sprng washer 6 and plan washer 7 suppled wth the machne.

  • Page 8: Installing And Connecting The Power Switch

    4. Installing and connecting the power switch (1) Installing the power switch Fx power swtch 1 under the machne table wth wood screws 2 . Fx the cable wth staples 3 suppled wth the machne as accessores n accordance wth the forms of use. * Fve staples 3 ncludng the staple for fxng the operaton panel cable are suppled as accessores.

  • Page 9: Installation Of The Sewing Machine Head

    5. Installation of the sewing machine head WARNING : To prevent possible accidents caused by the full of the sewing machine� perform the work by two persons or more when the machine is moved. ) Ft hnge rubber 1 to the hinge shaft ,and fix the sewng machne man unt. 2) When tghtenng nut 3 to hnge rubber 1 , tghten nut 3 untl sprng washer 2 becomes as B n the illustration, and fix it with nut 4 .

  • Page 10: Safety Switch

    7. Safety switch Remove tape 1 fixing the lever section of safety switch 2 . 1. When using the safety switch without removing tape 1 � it is very dangerous since the sewing machine works even in the state that it is tillted. 2. In case error 302 occurs when the sewing machine works after setup� loosen the safety switch fitting screw with a screwdriver, and lower the switchto the downside of the sewing machine.

  • Page 11: Installing The Operation Panel

    9. Installing the operation panel Fx operaton panel nstallng plate 1 on the machne table wth wood screws 2 and pass the cable through hole 4 n the machne table. Fx the operaton panel on panel nstallng plate 1 wth screws 3 suppled as accessores. Fx the cable on the bottom surface of the table wth the staples suppled wth the machne as accessores.

  • Page 12: Connecting The Cord

    10. Connecting the cord Remove four screws E fxng the rear cover of the electrcal box. When openng the rear cover, pressng t wth your hands, slowly open t by approxmately 90˚ until it stops as illustrated. �e sure to lend your hand to the rear cover in order not to let the rear cover Slowly fall. In addition� do not apply force to the...

  • Page 13: Installing The Motor Cover

    ) Take care so that the cord s not caught between the rear cover and the electrcal box man body, close the rear cover whle pressng secton A on the lower sde of the rear cover, and tghten four screws 1 . 2) Lower downward the cord located on the sde of the control box and cord presser plate C n the push hole B, press the cord and tghten screws 2 .

  • Page 14: Managing The Cord

    12. Managing the cord Slack ) In the state that the sewng machne s tlted, connect the cords, and bundle them wth clp band 1 as shown in the figure. 2) Fx the cords wth cords settng plate 2 in the state that the cords slacken as shown in the figure. When you tilt the sewing machine� make sure that the sewing machine head support bar is placed on the table.

  • Page 15: Installing The Thread Stand

    14. Installing the thread stand ) Assemble the thread stand unt, and nsert t n the hole n the machne table. 2) Tghten locknut 1 to fix the thread stand. 3) For celng wrng, pass the power cord through spool rest rod 2 . －...

  • Page 16: Operation Of The Sewing Machine

    [4] �PERATI�N �� THE SEWING MACHINE 1. Lubrication WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Check that the place between lower lne B and upper line A is filled with oil. Fill there with oil using the oiler suppled wth the machne as accessores when ol s short. The ol tank whch s flled wth ol s only for lubrcatng to the hook porton.

  • Page 17: Threading The Machine Head

    3. Threading the machine head WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Thin synthetic thread or the like Pull out the thread by approxmately 4 cm from the needle after threadng through the needle. 1. When the silicon oil is used� thread through thread guide for silicon 1 (�ptional) 2. �or thick thread� pass the thread through one hole only of needle bar thread guide 2 . 4. Installing and removing the bobbin case WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ) Open hook cover 1 . 2) Rase latch 3 of bobbn case 2 , and remove the bobbn case.

  • Page 18: Installing The Bobbin

    5. Installing the bobbin WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ) Set the bobbn 1 nto bobbn case 2 n the 2.5 cm direction shown in the figure. 2) Pass the thread through thread slt 3 of bobbn case 2 , and pull the thread as t s. By so dong, the thread wll pass under the tenson sprng and be pulled out from thread hole 4 .

  • Page 19: Adjusting The Thread Take-Up Spring

    7. Adjusting the thread take�up spring The standard stroke of thread take-up sprng 1 s 8 to 0 mm, and the pressure at the start s 0. to 0.3N. ) Adjustng the stroke Loosen setscrew 2 , and turn thread tenson asm. Turnng t clockwse wll ncrease the movng amount and the thread drawng amount wll ncrease.

  • Page 20: Operation Of The Sewing Machine (Basic)

    [5] �PERATI�N �� THE SEWING MACHINE (�ASIC) 1. Item data setting Set each tem followng the procedure descrbed below. Setting of the Setting of the Setting of the Setting of the Setting the max. sewing pattern No. X scale Y scale thread tension speed limitation (1) Turn �N the power switch. Pattern No. of the tem selecton lghts up, and the pattern No. s ndcated on the data dsplay. (2) Setting of the pattern No.
  • Page 21 (5) Setting of the max. sewing speed limitation ) Press the key to ndcate the tem “Speed” 2) Press key to ndcate “400”. (Settng of 400 st/mn) (6) Setting the thread tension ) Press key to ndcate the tem “THREAD TENSION” 2) Press key to ndcate “50”. (0 to 200 can be set.) (7) �inish of setting ) Press the key.

  • Page 22: Checking The Contour Of A Sewing Pattern

    2. Checking the contour of a sewing pattern WARNING : 1. Make sure without fail of the contour of the sewing pattern after selection of the sewing pattern. If the sewing pattern extends outside the work clamp feet� the needle will interfere with the work clamp feet during sewing� causing dangerous troubles including needle breakage. 2. When making sure of the contour of the sewing pattern� press + / � key with the needle bar lowered� and the work clamp feet move after automatically making the needle bar return to the upper position. ) Press key to make the READY LED lght up. 2) Select the work clamp foot lowerng wth key. 3) Lower the work clamp feet wth the foot swtch. T h e s e w i n g m a c h i n e d o e s n o t start even when the foot switch is depressed under this mode.

  • Page 23: Sewing

    3. Sewing ) Set a workpece on the work clamp foot secton. 2) Depress the pedal switch to the first step, and the work clamp feet wll come down. If you detach your foot from the pedal swtch, the work clamp feet wll go up.

  • Page 24: Winding A Bobbin

    5. Winding a bobbin 5�1. To wind a bobbin while the sewing machine is performing sewing Thread the bobbn wnder and wnd the bobbn thread onto the bobbin as illustrated in the figure. 5�2. To wind a bobbin independently ) Press key to make the SEWING LED go off. 2) Select the bobbn wnder wth key. Selection cannot be performed when the Sewing LED is lit up. 3) Press key.

  • Page 25: Thread Clamp Device

    6. Thread clamp device Trouble of sewng (slp-off of needle thread, sttch skppng, or stan of needle thread) at the tme of hgh- speed start can be prevented wth the thread clamp devce. The thread clamp devce works n the state that the thread clamp ndcaton LED lghts up and does not work when the LED goes off. Changeover of ON/OFF moton s performed wth key.
  • Page 26 (3) When the type of lower plate 1 that materal does not come n close contact wth throat plate 2 s used, needle thread on the wrong sde of materal may be rolled n the seams regardless of needle thread play or sewng length.

  • Page 27: Operation Of The Sewing Machine (Advanced)

    [6] �PERATI�N �� THE SEWING MACHINE (ADVANCED) 1. Performing sewing using the pattern keys ( � � � and Patterns (No. to 200) whch have been already regstered can be regstered to P to P50. It s possble to change and regster the scale, max. speed lmtaton, thread tenson and sewng poston. Same as the patterns (No. to 200), P to P50 are used by the selecton by scrollng the pattern Nos.
  • Page 28 6) Press key and set as follows wth key. X Scale rate : “50”%, Y Scale rate : “80” %, Max. speed lmtaton : “2000” st/mn, Thread tenson : “50” 7) Press key and “X Scale rate ” ndcaton becomes 0.0. Travelng amount n X drecton can be set n 0. mm unt.
  • Page 29 (2) Sewing operation Operaton example : After performng sewng wth the contents of the regstered P2, perform sewng wth the contents of P3. ) Turn ON the power swtch. 2) Press the key. 3) Press the key, and when the sewng LED lghts up, the work clamp foot goes up after t has moved.

  • Page 30: Performing Sewing Using The Combination Function

    2. Performing sewing using the combination function By arrangng n the order of use of the pattern regster (P to P50) whch have been already regstered and regsterng n C to C20, the sewng pattern wll change n the order every tme the sewng machne finishes the sewing. Every one combination No. can be registered up to the maximum 30 patterns. (1) Register of the combination Settng example : Combne n the order of P, P2 and P3, and regster them n the C.
  • Page 31 (2) Sewing operation Operaton example : Perform sewng wth the contents of the regstered C. ) Turn ON the power swtch. 2) Set the pattern No. to “C- ” usng the key. Scroll as follows : / 0 to 200 ,/ P1 to P50 ,/ C1 to C20 , 3) Press the key. When the sewng LED lghts up, the work clamp feet wll go up after havng moved.

  • Page 32: Performing Sewing Using The "Bobbin Thread Counter

    3. Performing sewing using the “bobbin thread counter” The producton counter can be used as the bobbn thread counter. In case a same sewng pattern s sewn in repetition, the sewing machine will stop sewing when the number of times (the specified number) that can be sewn wth a bobbn s reached. The bobbn thread counter s of the subtractng method. The counter at the time of delivery is set to the production counter (adding method).

  • Page 33: Setting The Pattern Thread Tension

    5. Setting the pattern thread tension Needle thread tenson for 6 sttches at the sewng start, the porton whch s changed over from bastng sttch to zgzag sttch, and the porton of te sttch at the sewng end can be ndvdually set. ) Whle the sewng LED lghts up, press to ndcate the needle thread tenson 2) Lower the presser wth the foot pedal.

  • Page 34: Cautions In Operation

    6. Cautions in operation () When the error ndcator lamp lghts up, be sure to check the cause of trouble and take a proper correctve measure. (2) Do not draw, by hand, the materal beng sewn durng sewng. Dong so wll cause the needle shft from the correct poston.

  • Page 35: Adjusting The Needle-To-Shuttle Relation

    2. Adjusting the needle�to�shuttle relation WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ) Turn the handwheel by hand. When needle bar Relation between needle and engraved lines 1 has gone up, adjust so that lower marker lne 2 engraved on the needle bar algns wth the bottom end of the needle bar bushng 3 , lower. 2) Loosen setscrew 1 n the drver.

  • Page 36: Adjusting The Lift Of The Work Clamp Foot

    3. Adjusting the lift of the work clamp foot WARNING : As the work is performed while the power is �N� never touch the switches other than the necessary one so as to prevent accidents caused by the malfunction of switches. ) Wth the machne n stop mode, remove sx setscrews 1 of the top cover, and take off top cover 2 . 2) Apply L-shaped wrench 3 to socket bolt 5 of clamp 4 , and loosen the socket bolt. 3) Push down L-shaped wrench 3 to ncrease the lft of the work clamp foot, or pull t up to decrease the lft.

  • Page 37: Needle Thread Clamp Device

    5. Needle thread clamp device WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ) When thread s caught at top end 1 of the thread clamp, thread clamp becomes ncomplete and sewng trouble at the sewng start wll be caused. Remove t wth tweezers or the lke. 2) When removng thread waste or thread dust collected on the thread clamp devce, remove t after removng the throat plate.

  • Page 38: Draining Waste Oil

    7. Draining waste oil When polyethylene oler 1 becomes filled with oil, remove polyethylene oler 1 and dran the ol. 8. Amount of oil supplied to the hook ) Loosen setscrew 1 and remove setscrew 1 . 2) When screwng n adjustment screw 2 , the amount of ol of ol ppe, left 4 can be reduced. 3) After the adjustment, screw n setscrew 1 and fix it.

  • Page 39: Changing The Voltage Of 100/200V

    10. Changing the voltage of 100/200V WARNING : To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine� carry out the work after turning ��� the power switch and a lapse of 5 minutes or more. To prevent accidents caused by unaccustomed work or electric shock� request the electric expert or engineer of our dealers when adjusting the electrical components. It s adaptable to the voltage of sngle phase 00V to 20V/3-phase 200V to 240V by changng the voltage changeover connector mounted on FLT p.c.b. (Caution) When the changing procedure is wrong� the control box will be broken. So� be very careful.

  • Page 40: Replenishing The Designated Places With Grease

    11. Replenishing the designated places with grease When the sewng machne has been used for a certan number of tmes of sewng, error code No. E220 s dsplayed on the operaton panel at the tme of turnng ON the power. Ths dsplay nforms the operator of the tme of replenshng the desgnated places wth grease. Be sure to replensh the places wth the grease below.

  • Page 41: How To Use The Memory Switch

    [8] H�W T� USE THE MEM�RY SWITCH The sewng machne operaton can be changed by changng the settng of the memory swtch. 1. Start and change of the memory switch ) When key s pressed n the state that the sewng LED s put out, the memory swtch settng mode s obtaned. 1.30 which is indicated when �M� key is Three figures from Two figures from the pressed indicates that the max. speed limitation...
  • Page 42 2) Press key n the state that memory swtch No.  s ndcated to make the sewng LED lght up. The contents of memory swtch No.  (max. sewng speed lmtaton value of the sewng machne) are ndcated. 3) Set "800" wth key.
  • Page 43 4) Indcate "000" wth key. The value returns to the ntal value at the tme of delvery from the factory wth key. Press key to cancel the operaton here and return to the state of step 2). 5) Press key. The sewng LED goes off and the set value of the first stitch is registered.
  • Page 44 3) Press key. The sewng LED lghts up and the set value of pattern No.  s ndcated. Set value  : Callng s operatve. Set value 0 : Callng s noperatve. 4) Set pattern No. 2 wth key. 5) Set the set value to "0" wth key.

  • Page 45: Table Of Functions Of The Memory Switch

    3. Table of functions of the memory switch Varous operatons of sewng machne can be set n programs by operatng the memory swtches. There are tems that change the ntal values at the tme of delvery accordng to the models. Indcaton Functon Settng range State when delvered Remarks Max.
  • Page 46 Indcaton Functon Settng range State when delvered Remarks Counter operaton 0 : P r o d u c t  o n c o u n t e r (addng)  : Bobbn thread counter (subtractng) Selecton of pedal 0 : Standard pedal  : Standard pedal (2-step stroke) 2 : Optonal pedal...
  • Page 47 Indcaton Functon Settng range State when delvered Remarks State of work clamp foot when 0 : Work clamp foot goes up. machne stopped by temporary  : Work clamp foot goes stop command can be selected. u p w  t h w o r k c l a m p foot swtch.

  • Page 48: Others

    [9] �THERS 1. Setting the DIP switch When “4” of DIP swtch on SDC crcut board SDC p.c.b. turned ON, the penetratng force s ncreased. Turn t ON when the penetrating force is insufficient. Turn OFF all DIP swtches other than the swtch above. Perform the changeover of DIP switch after turning ��� the power.

  • Page 49: Table Of The Standard Pattern Specifications

    2. Table of the standard pattern specifications Lengthwse Crosswse Number of sttches Pattern S, F, H Large sze bartackng ＊ Large sze bartackng ＊ Large sze bartackng ＊ Large sze bartackng Large sze bartackng ＊ Large sze bartackng ＊ Large sze bartackng ＊...

  • Page 50: Table Of The Standard Patterns

    3. Table of the standard patterns Sewng sze Sewng sze (Note 2) (Note 2) (mm) (mm) Sttch dagram Sttch dagram No. of work No. of work Length- Cross- Length- Cross- clamp foot clamp foot wse wse wse wse (5) ※ ※ (Note3) ※ ※ ※ ※...
  • Page 51 Sewng Sewng (Note 2) (Note 2) sze (mm) sze (mm) Sttch dagram Sttch dagram No. of work No. of work clamp foot clamp foot Length- Cross- Length- Cross- wse wse wse wse ø2 ø8 (Caution) Pattern Nos. 41 to 46 are for the optional work clamp foot No. 12. The origin of the patterns is different by 5 mm up and down from that of lengthwise bartacking pattern Nos. 23 to 26. －...

  • Page 52: Table Of The Work Clamp Foot

    4. Table of the work clamp foot 358659 (asm.) 3548557 (asm.) 3542964 (asm.) Work clamp foot 4607 46404 46800 46305 46206 (Wth knurl) (Wth knurl) (Wth knurl) (Wthout knurl) (Wthout knurl) Feed plate 21.2 11.4 Sewingspecification H / W ※ Fnger guard 353304 S t a n d a r d Suppled wth F (foundaton) Optonal S t a n d a r d...
  • Page 53 35485(asm.) 354245 (asm.) 357955 (asm.) 356360 (asm.) Work clamp foot 3548003 3554803 46602 46503 46909 4670 (Wth knurl) (Wth knurl) (Wth knurl) (Wthout knurl) (Wthout knurl) (Wthout knurl) Feed plate 27.4 37.3 Sewng H / W specification ※ Fnger 3548300 353304 3573407 guard...

  • Page 54: Lk-1900 Data Rom

    R�M is prior to other pattern. ROM whch can be used : 27C256 EPROM JUKI Part No. : HL008423000 6. Connection of the optional pedal (1) Connection of PK�57 ) Connect PK-57 change cable 2 wth CN4 of MAIN crcut board 1 .

  • Page 55: Error List

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  • Page 58: Troubles And Corrective Measures (Sewing Conditions)

    8. Troubles and corrective measures (sewing conditions) Trouble Cause Correctve measures Page . The needle thread 1 Sttches are slpped at the start. ™ Adjust the clearance between the needle slps off at the start and the shuttle to 0.05 to 0. mm. of bar-tackng. ™ Set soft-start sewng at the start of bartackng.
  • Page 59 Trouble Cause Correctve measures Page 6. The needle thread 1 The needle thread tenson s not ™ Increase the needle thread tenson. comes out on the hgh enough. wrong sde of the 2 The tenson release mechansm ™ Check whether or not the tenson dsc materal.

  • Page 60: Table Of The Optional Parts

    9. Table of the optional parts Name of Parts Type Part No. Remarks Wthout knurl / processed 42009 Feed plate blank Sewng area lengthwse 20 X crosswse 40 Wth knurl / processed 420307 Sewng area lengthwse 20 X crosswse 40 Wthout knurl / stanless steel 420505 t = 0.5 Sewng area lengthwse 20 X crosswse 40...
  • Page 61 Name of Parts Type Part No. Remarks Fnger guard (2) A=66.5 B=43 3573407 lengthwse bartackng � Fnger guard (3) A=2.5 B=35.5 420000 For specally ordered work clamp � SM8040302TP Wth knurl / processed (rght) 4002869 Work clamp foot blan Wth knurl / processed (left) 4002870 －...

  • Page 62: Explanation Of The Lk-1901A, Computer-Controlled High-Speed Eyelet Buttonhole Bartacking Machine

    @. EXPLANATI�N �� THE LK�1901A� C�MPUTER�C�NTR�LLED HIGH�SPEED EYELET �UTT�NH�LE �ARTACKING MACHINE 1. Specifications Different specifications from those of the LK-1900A only are described. ) Sewng speed ..........Max. 3,000st/mn 2) Needle ............DPx5 #4, #6 3) Lftng method of the work clamp foot ..Steppng motor 4) Lft of the work clamp foot ......

  • Page 63: Adjustment Of The Material Closing Amount

    3. Adjustment of the material closing amount WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Graduation ) The maxmum materal closng amount s 4 mm. However, the amount s set to 2 mm at the tme of delvery because of the relaton of the feed plate wndow and the work clamp foot (dmenson C). (Graduaton poston : 2) 2) Loosen bolt 1 and move work clamp foot regulator 2 n the drecton of arrow to adjust the materal closng amount.

  • Page 64: Adjustment Of The Pressure Of The Work Clamp Unit

    5. Adjustment of the pressure of the work clamp unit WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ) The pressure of the work clamp unt should be mnmzed as long as the materal does not warp durng sewng. Loosen adjustng screw 1 and turn adjustng screw 2 to obtan the aforementoned pressure. 6. Setting of the material closing operation ) The materal closng operaton s performed by the electromagnetc solenod, and change-over of the operaton settng (effectve / neffectve) s avalable.

  • Page 65: Selection And Confirmation Of The Sewing Patterns

    7. Selection and confirmation of the sewing patterns WARNING : In case of using an exclusive work clamp foot� make sure of the shape of the sewing pattern. If the sewing pattern extends outside the work clamp foot� the needle interferes with the work clamp foot during sewing� resulting in the danger of the needle breakage or the like. ) The patterns for eyelet buttonhole bartackng are from No.  to No. 3. 2) When the materal closng operaton s performed, the maxmum sewng sze s 3x7mm.

  • Page 66: Explanation Of The Lk-1902A, Computer-Controlled High-Speed Belt-Loop Attaching Machine

    #. EXPLANATI�N �� THE LK�1902A� C�MPUTER�C�NTR�LLED HIGH�SPEED �ELT�L��P ATTACHING MACHINE 1. Specifications Different specifications from those of the LK-1900A only are described. ) Sewng speed ..........Max. 3,000st/mn 2) Needle ............DPx5 #4, #6 3) Lftng method of the work clamp foot ..Steppng motor 4) Lft of the work clamp foot ......

  • Page 67: Selection And Confirmation Of The Sewing Patterns

    4. Selection and confirmation of the sewing patterns WARNING : In case of using an exclusive work clamp foot� make sure of the shape of the sewing pattern. If the sewing pattern extends outside the work clamp foot� the needle interferes with the work clamp foot during sewing� resulting in the danger of the needle breakage or the like. ) The patterns for the belt-loop attachng are from No. 7 to No. 22. As for the way of operaton for settng, checkng or changng the sewng pattern, refer to the tem “Operaton of the sewng machne (basc)”...

  • Page 68: High-Speed Lockstitch Button Sewing Machine

    $. EXPLANATI�N �� THE LK�1903A� C�MPUTER�C�NTR�LLED HIGH�SPEED L�CKSTITCH �UTT�N SEWING MACHINE 1. Specifications Different specifications from those of the LK-1900A only are described. ) Sewng speed ..........Max. 2,700st/mn 2) Needle ............DPx7 #4 3) Lftng method of the work clamp foot ..Steppng motor 4) Lft of the work clamp foot ......

  • Page 69: Various Sewing Modes

    4. Various sewing modes (1) List of sewing patterns Number of threads and standard sewng sze of X and Y are as shown n the followng lst. < Sewng program lst > Pattern Sttch Number Standard Standard Pattern Sttch Number Standard Standard shape of threads sewng sze X sewng sze Y shape of threads...

  • Page 70: Position Of The Button Clamp Jaw Lever

    (2) Selection of the sewing pattern and the sewing width ™ Selecton of the sewng pattern s the same as that of the LK-900A. ™ When the distance between holes of the button used does not fit the standard sewing width of the sewng pattern No., adjust the sewng wdth by enlargng/reducng the sewng wdth. The way of enlargng/reducng s the same as that of the LK-900A.

  • Page 71: Adjusting The Feed Plate

    6. Adjusting the feed plate WARNING : When change of the shape of the button� change of the sewing pattern or enlargement/reduction of the sewing width is performed� make sure of the shape of the sewing pattern. If the feed plate interferes with the needle hole guide� it will result in the danger of the needle breakage or the like. Also� if the pedal is depressed during the adjustment� the button clamp unit will go up or come down. So� be careful. ) Press key n the state that the swng LED goes off usng the operaton panel. 2) Press key. / 3) Press key. The button clamp unt goes to the orgn poston and goes up. 4) Adjust feed plate 1 so that needle hole gude 2 comes to the center of the recessed part of feed plate 1 .

  • Page 72: Adjusting The Lifting Amount Of The Button Clamp

    8. Adjusting the lifting amount of the button clamp WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Max. 13mm Loosen two setscrews 1 , and move movng plate 2 back and forth n the drecton of arrow to adjust. The lftng amount of the button clamp wll be decreased when movng plate 2 s moved n the drecton of A , and be ncreased when t s moved n the drecton of B .

  • Page 73: Adjustment Of The Wiper Spring

    10. Adjustment of the wiper spring WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Wper sprng 1 retans the needle thread after thread trmmng n between wper 2 and the wper sprng. Correct properly the tenson of wper sprng 1 so that the tenson at that tme becomes 0.2 to 0.3N (a lttle hgher tenson than that of the bobbn thread comng out of the bobbn case).

  • Page 74: Model Classification According To The Button Size

    12. Model classification according to the button size Model LK-903A-30 LK-903A-302 Button size classification For small-szed buttons For medum-szed button Outsde dameter of applcable buttons (mm) ø0 to ø20 ø0 to ø20 Length Sewng sze (mm) 0 to 3.5 0 to 4.5 Wdth 0 to 3.5 0 to 4.5...

  • Page 75: Attaching The Shank Botton (Optional)

    13. Attaching the shank botton (optional) (1) Specifications Model Optonal Needle TQx3 #4 Max. ø20 Shape of button Outsde dameter Mn. ø.5 Dameter of hole Poston of hole 1.5 mm or more Shape of shank secton R(mm) Mnmum Maxmum – As for the dmensons of the shape of shank secton, reder to the above table for reference.
  • Page 76 (2) Adjusting the height of the needle bar WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 4.3mm ) Loosen needle bar connecton screw 1 and move the needle bar 2 up or down so that second engraved marker lne A as counted from the bottom s algned wth the bottom end of needlebar bushng 3 when turnng the hand pulley to brng the needle bar to ts lowest poston.
  • Page 77 (4) Adjusting the button clamp support WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Loosen setscrew 1 , and place the button to be used n between the button clamps. Then determne the longtudnal poston of the button hole and the slot of button clamp base 4 by movng button clamp support, front 2 and rear 3 back and forth.
  • Page 78 (7) Adjusting the button support rubber WARNING : Turn ��� the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. To adjust the poston of button support rubber asm. 1 , loosen setscrews 2 and 3 , and adjust so that the pressng secton of the button support rubber can press the center of the button at rght angles to the button.

  • Page 79: Drawing Of The Table

    Drawer stopper installing position One place on the rear side o Drilled hole 9, 20 spot face 17 deep e JUKI logotype !0 2- drilled hole 2, 10 deep on the rear side (Power switch installing hole) r 4- drilled hole 8...
  • Page 80 Drawer stopper installing position !0 Drilled hole 17 One place on the rear side !1 Drilled hole 28 e JUKI logotype !2 2- drilled hole 2, 10 deep on the rear r Drilled hole 8 side (Power switch installing hole)

This manual is also suitable for:

Lk-1903aLk-1902aLk-1901aLk-1900a

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