JUKI LK-1900B series Instruction Manual
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JUKI LK-1900B series Instruction Manual

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ENGLISH
LK-1900B Series
INSTRUCTION MANUAL

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Summary of Contents for JUKI LK-1900B series

  • Page 1 ENGLISH LK-1900B Series INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    CONTENTS I. E X P L A N AT I O N O F L K - 1 9 0 0 B , 7. MAINTENANCE ..........44 7-1. Adjusting the height of the needle bar ..44 COMPUTER-CONTROLLED HIGH- 7-2. Adjusting the needle-to-shuttle relation ..45 SPEED BARTACKING MACHINE ..1 7-3.
  • Page 3 IV. EXPLANATION OF THE LK-1903B, VI. EXPLANATION OF THE LK-1900BB COMPUTER-CONTROLLED HIGH- COMPUTER-CONTROLLED, HIGH- S P E E D L O C K S T I T C H B U T TO N SPEED BARTACKING MACHINE SEWING MACHINE ......79 (WITH THE BIRD'S NEST PREVENT- 1.

  • Page 4: Computer-Controlled High- Speed Bartacking Machine

    I. EXPLANATION OF LK-1900B, COMPUTER-CONTROLLED HIGH-SPEED BARTACKING MACHINE 1. SPECIFICATIONS 1 Sewing area X (lateral) direction 40 mm Y (longitudinal) direction 30 mm 3,200 sti/min (When sewing pitches are less than 5 mm in X-direction 2 Max. sewing speed and 3.5 mm in Y -direction.) 3 Stitch length 0.1 to 10.0 mm (adjustable in 0.1 mm step) 4 Feed motion of work clamp foot...

  • Page 5: Configuration

    2. CONFIGURATION 2-1. Names of main unit ❸ ❶ ❹ ❷ ❺ ❼ ❻ ❽ ❶ Machine head ❷ Work clamp feet ❸ Thread stand ❹ Operation panel ❺ Power switch ❻ Control box ❼ Pedal ❽ Power switch (EU type) －...

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

    2-2. Names and explanation of switches on the operation panel ❻ ❼ ❶ ❾ ❽ ❷ ❸ ❹ ❺ NAME FUNCTION NAME FUNCTION ❽ ❶ LCD display Various data such as pattern EDIT key This key is used to display No., shape, etc.

  • Page 7: Installation

    3. INSTALLATION 3-1. Installing the electrical box Install control box ❶ to the location illustrated in the figure using four bolts ❷ , four plain washers ❸ and ❷ four spring washers ❹ and four hexagonal nuts ❺ supplied with the unit. Bolt ❷...

  • Page 8: Attaching The Connecting Rod

    3-3. Attaching the connecting rod 1) Fix connecting rod ❶ to installing hole B of pedal lever ❷ with nut ❸ . 2) The pedal depressing stroke is decreased by fitting connecting rod ❶ in mounting hole A. ❷ ❸ ❶...

  • Page 9: Installing And Connecting The Power Switch

    3-5. Installing and connecting the power switch (1) Installing the power switch Fix power switch ❶ under the machine table with ❸ wood screws ❷ . Fix the cable with staples ❸ supplied with the machine as accessories in accordance with the forms of use. ❶...

  • Page 10: How To Carry The Sewing Machine

    3-6. How to carry the sewing machine To carry the sewing machine, it is necessary to hold A section and support the side faces of the sewing ma- chine by hand as illustrated in the figure. 1. Carefully prevent slippage of your hand that holds the cover. 2.

  • Page 11: Installing The Drain Receiver And The Head Support Rubber

    3-8. Installing the drain receiver and the head support rubber 1) Fix drain receiver ❷ in the installing hole of table ❸ ❶ with two setscrews ❸ . 2) Screw poly-oiler ❹ in waste oil reservoir ❷ . ❷ 3) Insert sewing-machine waste oil pipe ❺ into po- ly-oiler ❹...

  • Page 12: Tilting The Sewing Machine Head

    3-10. Tilting the sewing machine head WARNING : Tilt/raise the sewing machine head with both hands taking care not to allow your fingers to be caught in the head. Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

  • Page 13: Connecting The Cords

    3-12. Connecting the cords DANGER : To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine, carry out the work after turning OFF 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.

  • Page 14: Handling The Cords

    3-13. Handling the cords DANGER : To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine, carry out the work after turning OFF 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.

  • Page 15: Installing The Thread Stand

    3-15. Installing the thread stand 1) Assemble the thread stand unit, and insert it in the hole in the machine table. 2) Tighten locknut ❶ to fix the thread stand. 3) For ceiling wiring, pass the power cord through spool rest rod ❷ . ❷...

  • Page 16: Operation Of The Sewing Machine

    4. OPERATION OF THE SEWING MACHINE 4-1. Lubrication WARNING : Turn OFF 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 line B and up- per line A is filled with oil.

  • Page 17: Threading The Machine Head

    4-3. Threading the machine head WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ❶ ❷ Thin filament thread or the like 1903BBS sewing machine with the bird's nest preventing and shorter-thread remaining type thread trimmer (Polyester spun thread #80) Pull out the thread by approximately 40mm from the needle after threading through the needle.

  • Page 18: Installing The Bobbin

    4-5. Installing the bobbin WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 1) Set the bobbin ❶ into bobbin case ❷ in the di- 25mm rection shown in the figure.

  • Page 19: Adjusting The Thread Take-Up Spring

    4-7. Adjusting the thread take-up spring The standard stroke of thread take-up spring ❶ is 8 to 10 mm, and the pressure at the start is 0.1 to 0.3N. 1) Adjusting the stroke Loosen setscrew ❷ , and turn thread tension ❶...

  • Page 20: Setting The Pattern Number

    5-2. Setting the pattern number ❼ Turn ON the power switch. Pattern number is displayed on the upper left section of the screen to indicate the pattern shape, X/Y en- largement/reduction ratios, thread tension value and sewing speed. ❼ , the When you press DATA CHANGE key pattern number can be changed.
  • Page 21 (2) Inputting the Y size ❻ ❼ ❻ to display the Press ITEM SELECT key C002 Y size. ❼ to display the Press DATA CHANGE key value you desire. One of the input methods for the X/Y sizes can be selected;...
  • Page 22 ❼ ❻ On the comment input screen, as many as 14 char- acters can be input. The characters that can be input are alphabets, numbers and symbols. ❻ to specify the in- Press ITEM SELECT key ❼ to put position. Press DATA CHANGE key ❾...

  • Page 23: Checking The Contour Of A Sewing Pattern

    5-4. 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.

  • Page 24: Sewing

    5-5. Sewing 1) Set a workpiece on the work clamp foot section. 2) When you depress the pedal to the first step, the work clamp comes down. When you release the pedal, the work clamp goes up. 3) Depress the pedal switch to the second step after ➡...

  • Page 25: Winding A Bobbin

    5-7. Winding a bobbin (1) To wind a bobbin while the sewing machine is performing sewing Thread the bobbin winder and wind the bobbin thread onto the bobbin as illustrated in the figure. (2) For winding a bobbin only ❻ ❷...

  • Page 26: Thread Clamp Device

    5-8. Thread clamp device Trouble of sewing (slip-off of needle thread, stitch skipping, or stain of needle thread) at the time of high- speed start can be prevented with the thread clamp device. The thread clamp device works in the state that the thread clamp indication LED lights up and does not work when the LED goes off.
  • Page 27 (3) In the case feed plate ❶ which prevents the material from coming in close contact with throat plate ❷ is used, the needle thread which appears on the wrong side of the material can run off the seam regardless of the sewing length.

  • Page 28: Operation Of The Sewing Machine (Advanced)

    6. OPERATION OF THE SEWING MACHINE (ADVANCED) 6-1. Performing sewing using the pattern keys Patterns (No.1 to 200) which have been already registered can be registered to P1 to P50. It is possible to change and register the scale, max. speed limitation, thread tension and sewing position. Same as the pat- terns (No.1 to 200), P1 to P25 are used by the selection by scrolling the pattern Nos.
  • Page 29 ❼ ❽ . Edit the item data with 3) Press EDIT key ❼ . DATA CHANGE key The item data that can be edited are as de- scribed in "(2) Listing of item data" p.28 ". ❽ 4) Respectively set the X reduction ratio to "50" (%), Y reduction ratio to "80"...
  • Page 30 ❷ , key to finalize the 7) Press READY key setting. ❹ . 8) Press MODE key Pattern register mode is finalized. ❹ . 9) Press MODE key Mode setting is finalized and the mode returns to the normal mode. ❷...
  • Page 31 (2) Listing of item data Item name Pictograph Input range Remarks: Type of pattern S001 Standard pattern / * This data is for display only. To edit the data, delete the direct pattern User pattern and create a new direct pattern. Pattern No.
  • Page 32 (3) Sewing operation Operation example : After performing sewing with the contents of the registered P2, perform sewing with the contents of P3. 1) Turn ON the power switch. 2) Press direct pattern 3) Press READY key to light up SET READY LED .

  • Page 33: Sewing Using The Combination Function (Cycle Sewing)

    6-2. Sewing using the combination function (cycle sewing) This sewing machine can perform sewing of plural sewing pattern data in one cycle in the order of the data. As many as 99 patterns can be input. Use this function for sewing two or more different patterns on the sewing product.
  • Page 34 (2) Method of editing cycle data 1) Set the mode to input mode. ❻ ❼ Under the input mode where SET READY LED  goes out, entry of the cycle data is enabled. If the current mode is the sewing mode, press ❷...
  • Page 35 (3) Sewing operation ❻ ❼ 1) Turn the power ON. 2) Select the cycle pattern using ITEM SELECT key ❻ . Select the cycle pattern number with ❼ . DATA CHANGE key ❷ to light up SET 3) Press READY key READY LED  .

  • Page 36: Sewing Through The Use Of The Counter

    6-3. Sewing through the use of the counter (1) Setting procedure of the counter value ❻ 1) Call counter setting screen. ❹ , in the state where Press MODE key SET READY LED  goes out, to display the mode screen. Place "02 Counter setting"...
  • Page 37 (2) Kind of counter ① Sewing UP counter Every time the sewing of one shape is performed, the existing value is counted up. When the existing value is equal to the set value, count-up screen is displayed. ② Sewing DOWN counter Every time the sewing of one shape is performed, the existing value is counted down.
  • Page 38 4) How to check the counter in the ready state ❻ 1) Under the sewing mode where SET READY LED  lights up, press ITEM SELECT key ❻ to display the counter screen. ❼ 2) On the counter screen, the current value on the counter can be updated with DATA CHANGE key ❼...

  • Page 39: How To Use The Temporary Stop

    6-4. How to use the temporary stop Once the RESET key function is set to the "pause" by means of the memory switch U031, the RESET key will function as the pause key to allow the sewing machine to be stopped during sewing. (Refer to "I.8-2.

  • Page 40: Setting The Pattern Thread Tension

    6-5. Setting the pattern thread tension Needle thread tension for 6 stitches at the sewing start, the portion which is changed over from basting stitch to zigzag stitch, and the portion of tie stitch at the sewing end can be individually set. For the user pattern, the needle thread tension can be individually set as desired.

  • Page 41: Copying Or Deleting Various Kinds Of Pattern Data

    6-6. Copying or deleting various kinds of pattern data Data of pattern No. which has been already registered can be copied to pattern No. which has not been used. Overwriting copy of the pattern is prohibited. When you desire to overwrite, perform it after erasing the pattern once.
  • Page 42 6) Erasing the pattern ❻ to select the pattern number you In the case of erasing the pattern, select ITEM SELECT key ❼ to select Trash want to delete. Press DATA CHANGE key . Then, press READY key ❷ . The delete confirmation screen is displayed. The pattern is deleted by pressing RESET key ❸...

  • Page 43: Communication

    • Some type of the USB device may not be properly recognized by this sewing machine. • JUKI does not compensate for loss of data stored on the USB device caused by using it with this sewing ma- chine. •...
  • Page 44 Extension Description of data Data on needle entry points created with the PM- VD00 XXX .VDT Vector form data 1. The data form is commonly used among JUKI (XXX:001 to 999) sewing machine.(User pattern) ❼ ❻ 3) Selecting the communication direction ❻...

  • Page 45: Cautions In Operation

    6-8. Cautions in operation (1) When the error indicator lamp lights up, be sure to check the cause of trouble and take a proper correc- tive measure. (2) Do not draw, by hand, the material being sewn during sewing. Doing so will cause the needle shift from the correct position.

  • Page 46: Setting Enable/Disable Of Standard Pattern Invoking

    6-9. Setting enable/disable of standard pattern invoking Invoking of a wrong pattern is prevented by disabling invoking of unnecessary patterns. In addition, necessary patterns can be invoked and used. Example of setting: Invoking of pattern No. 2 is dis- abled. 1) Putting the sewing machine in the input mode Under the input mode where the SET READY LED  goes out, setting of data is enabled.

  • Page 47: Maintenance

    7. MAINTENANCE 7-1. Adjusting the height of the needle bar WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ❷ ❹ : Upper ❹ ❸ engraved line A : Engraved line ❶...

  • Page 48: Adjusting The Needle-To-Shuttle Relation

    7-2. Adjusting the needle-to-shuttle relation WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 1) Turn the handwheel by hand. When needle bar Relation between needle and engraved lines ❶...

  • Page 49: Adjusting The Lift Of The Work Clamp Foot

    7-3. Adjusting the lift of the work clamp foot WARNING : As the work is performed while the power is ON, never touch the switches other than the necessary one so as to prevent accidents caused by the malfunction of switches. 1) With the machine in stop mode, remove six set- ❹...

  • Page 50: Needle Thread Clamp Device

    7-5. Needle thread clamp device WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ❶ ❶ When thread is caught at top end of the thread clamp, thread clamp becomes incomplete and sewing trou- ble at the sewing start will be caused.

  • Page 51: Draining Waste Oil

    7-7. Draining waste oil When polyethylene oiler ❶ becomes filled with oil, remove polyethylene oiler ❶ and drain the oil. ❶ 7-8. Amount of oil supplied to the hook 1) Loosen setscrew ❶ and remove setscrew ❶ . 2) When screwing in adjustment screw ❷ , the amount of oil of oil pipe, left ❹...

  • Page 52: Replenishing The Designated Places With Grease

    7-10. Replenishing the designated places with grease When the sewing machine has been used for a cer- tain number of times of sewing, error code No. E220 is displayed on the operation panel at the time of turning ON the power. This display informs the oper- ator of the time of replenishing the designated places with grease.
  • Page 53 ❶ ❷ located at periphery of crank rod ❷ . ❹ 3) Fill coupling ❹ with grease through JUKI Grease ❸ A tube ❺ . 4) Sink screw ❻ supplied with the unit into the cou- pling to add the grease.

  • Page 54: How To Use The Memory Switch

    8. HOW TO USE THE MEMORY SWITCH 8-1. Method of changing memory switch data 1) Set the mode to input mode. ❻ ❼ Under the input mode where SET READY LED  goes out, change to the memory switch data is enabled.

  • Page 55: List Of The Memory Switch Functions

    8-2. List of the memory switch functions Various operations of the sewing machine can be set by programming the memory switch. The initial setting values at the time of shipment differ with models.. Function Setting range State when delivered Remarks U001 Max.
  • Page 56 Function Setting range State when delivered Remarks U025 Optional pedal 2 operation OFF when depressing pedal again OFF when detaching from pedal Height of work clamp foot at the time of 2-step U026 50 to 90 Height is lowered when the set value stroke is increased.
  • Page 57 Function Setting range State when delivered Remarks U042 Needle bar stop position is set. Needle bar rotates in the reverse direc- : UP position : Upper dead point tion after the UP po- sition stop and stops when upper dead point stop is set.
  • Page 58 Function Setting range State when delivered Remarks U239 Choice of language. Not yet selected With this switch, the language to be displayed on the panel is selected. (display in En- * The number of selectable languages differs with the type of glish) sewing machine shipped : Not yet selected (display in English)

  • Page 59: Others

    9. OTHERS 9-1. Table of the standard pattern specifications Lengthwise Crosswise Number of stitches Pattern S, F, H ＊ 1 (51) Large size bartacking ＊ Large size bartacking ＊ Large size bartacking Large size bartacking ＊ Large size bartacking ＊ Large size bartacking ＊...

  • Page 60: Table Of The Standard Patterns

    9-2. Table of the standard patterns Sewing size Sewing size (Note 2) (Note 2) (mm) (mm) Stitch diagram Stitch diagram No. of work No. of work Length- Cross- Length- Cross- clamp foot clamp foot wise wise wise wise (51) ※ ※...
  • Page 61 Sewing Sewing (Note 2) (Note 2) size (mm) size (mm) Stitch diagram Stitch diagram No. of work No. of work clamp foot clamp foot Length- Cross- Length- Cross- wise wise wise wise ø12 ø8 Pattern Nos. 41 to 46 are for the optional work clamp foot No.

  • Page 62: Table Of The Work Clamp Foot

    9-3. Table of the work clamp foot 13518659 (asm.) 13548557 (asm.) 13542964 (asm.) Work clamp foot 14116107 14116404 14116800 14116305 14116206 (With knurl) (With knurl) (With knurl) (Without knurl) (Without knurl) Feed plate 21.2 11.4 Sewingspecification H / W ※ Finger guard 13533104 Standard ac- Supplied with F (foundation)
  • Page 63 13548151(asm.) 13542451 (asm.) 13571955 (asm.) 13561360 (asm.) Work clamp foot 13548003 13554803 14116602 14116503 14116909 14116701 (With knurl) (Without knurl) (Without knurl) (Without knurl) (With knurl) (With knurl) Feed plate 27.4 37.3 Sewing H / W specification ※ Finger 13548300 13533104 13573407 guard...

  • Page 64: Installing The Foot Pedal Switch (Optional)

    9-4. Installing the foot pedal switch (optional) DANGER : To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine, carry out the work after turning OFF 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.

  • Page 65: Error List

    9-5. Error list Error code Indication Description of error Corrective measure Remarks Machine lock error E007 Turn OFF the power switch and remove the cause of The main shaft of the sewing machine troubles. does not rotate due to some troubles. E010 Pattern No.
  • Page 66 E063 Machine head identification error Turn the power OFF and The type of machine head and the type of contact JUKI or your distribu- control box do not match. tor. E204 Connection alert for the USB thumb Re-operation is enabled after drive which is used for sewing resetting.
  • Page 67 Error code Indication Description of error Corrective measure Remarks Shorter-thread remaining type thread E396 Turn OFF the power switch. trimmer cylinder error Check whether the air pres- The shorter-thread remaining thread trim- sure is adequate and wheth- mer cylinder fails to operate. er the shorter-thread remain- (The shorter-thread remaining type thread ing thread trimming cylinder...
  • Page 68 Error code Indication Description of error Corrective measure Remarks Motor driver trouble E901 Turn OFF the power switch Error from the motor driver is detected. and turn ON the power switch again after some time. E903 Stepping motor power supply trouble Turn OFF the power switch Power source of the stepping motor is not and check F1 fuse of SDC...
  • Page 69 Error code Indication Description of error Corrective measure Remarks Y motor displacement error E927 Turn OFF the power. Y feed motor is out of position. E929 Needle thread clamp motor displace- Turn OFF the power switch ment error and check whether CN45 of Needle thread clamp motor is out of posi- MAIN board is disconnected tion.

  • Page 70: Message List

    9-6. Message list Message No. Display Display message Description M520 Erase is performed. OK ? Erase confirmation of Users' pattern M521 Erase is performed. OK ? When deletion of the direct pattern is checked M522 Erase is performed. OK ? Erase confirmation cycle pattern M523 Pattern data is not stored in memory.
  • Page 71 Message No. Display Display message Description M547 Overwriting cannot be performed since data ex- Overwrite is disabled (panel) ists. M548 Overwriting cannot be performed since data ex- Overwrite is disabled (media) ists. M581 Registration is canceled. Registration of a direct pattern M582 Copy is cancelled.

  • Page 72: Troubles And Corrective Measures (Sewing Conditions)

    9-7. Troubles and corrective measures (sewing conditions) Trouble Cause Corrective measures Page ① Stitches are slipped at the ◦ Adjust the clearance between the nee- 1. T h e n e e d l e t h r e a d slips off at the start of start.
  • Page 73 Trouble Cause Corrective measures Page ① The motions of the needle ◦ Correct the positions of the needle and 5. Stitch skipping often occurs. and shuttle are not properly shuttle. synchronized. ② The clearance between the ◦ Correct the positions of the needle and needle and shuttle is too shuttle.

  • Page 74: Table Of The Optional Parts

    9-8. Table of the optional parts Name of Parts Type Part No. Remarks Without knurl / processed 14120109 Feed plate blank Sewing area lengthwise 20 X crosswise 40 With knurl / processed 14120307 Sewing area lengthwise 20 X crosswise 40 Without knurl / stainless steel 14120505 t = 0.5...
  • Page 75 Name of Parts Type Part No. Remarks Finger guard (2) A=66.5 B=43 13573407 lengthwise bartacking Finger guard (3) For specially A=21.5 B=35.5 14120000 ordered work clamp SM8040302TP With knurl / processed (right) 40021869 Work clamp foot blank With knurl / processed (left) 40021870 PK57 changing cable asm.

  • Page 76: Explanation Of The Lk-1901B, Computer-Controlled High- Speed Eyelet Buttonhole Bartacking Machine

    II. EXPLANATION OF THE LK-1901B, COMPUTER-CONTROLLED HIGH-SPEED EYELET BUTTONHOLE BARTACKING MACHINE 1. SPECIFICATIONS Different specifications from those of the LK-1900B only are described. Max. sewing speed 3,000 sti/min Needle DPx5 #14, #16 Lift of the work clamp foot Max. 17mm Number of standard patterns 3 patterns 2.

  • Page 77: Preparation Of The Sewing Machine

    3. PREPARATION OF THE SEWING MACHINE 3-1. Adjustment of the material closing amount WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Graduation ❷ ❶ 1) The maximum material closing amount is 4 mm. However, the amount is set to 2 mm at the time of de- livery because of the relation of the feed plate window and the work clamp foot (dimension C).

  • Page 78: Adjustment Of The Pressure Of The Work Clamp Unit

    3-3. Adjustment of the pressure of the work clamp unit WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ❷ ❶ The pressure of the work clamp unit should be minimized as long as the material does not warp during sewing.

  • Page 79: Operation Of The Sewing Machine

    4. OPERATION OF THE SEWING MACHINE 4-1. 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.

  • Page 80: Explanation Of The Lk-1902B, Computer-Controlled High-Speed Belt-Loop Attaching Machine

    III. EXPLANATION OF THE LK-1902B, COMPUTER-CONTROLLED HIGH-SPEED BELT-LOOP ATTACHING MACHINE 1. SPECIFICATIONS Different specifications from those of the LK-1900B only are described. Max. sewing speed 3,000 sti/min Needle DPx5 #14, #16 Lift of the work clamp foot Max. 17mm Number of standard patterns 6 patterns 2.

  • Page 81: Operation Of The Sewing Machine

    3. OPERATION OF THE SEWING MACHINE 3-1. 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.

  • Page 82: Explanation Of The Lk-1903B, Computer-Controlled High

    IV. EXPLANATION OF THE LK-1903B, COMPUTER-CONTROLLED HIGH-SPEED LOCKSTITCH BUTTON SEWING MACHINE 1. SPECIFICATIONS Different specifications from those of the LK-1900B only are described. Max. sewing speed 2,700 sti/min Needle DPx17 #14 Lift of the work clamp foot Max. 13mm Number of standard patterns 50 patterns * The needle thread clamp device is set to prohibition (state of standard delivery) with memory switch U035.

  • Page 83: Various Sewing Modes

    2-3. Various sewing modes (1) List of sewing patterns Number of threads and standard sewing size of X and Y are as shown in the following list. < Sewing program list > Pattern Stitch Number Standard Standard Pattern Stitch Number Standard Standard shape...

  • Page 84: Adjustment Of The Sewing Machine

    (2) Selection of the sewing pattern and the sewing width ◦ Selection of the sewing pattern is the same as that of the LK-1900B. ◦ When the distance between holes of the button used does not fit the standard sewing width of the sew- ing pattern No., adjust the sewing width by enlarging/reducing the sewing width.

  • Page 85: Adjusting The Feed Plate

    4) Place a button in button clamp jaw levers ❶ . 5) Depress the pedal to the first step and detach your foot from the pedal when the button clamp unit comes down. ❷ 6) Turn the hand pulley and check that the center of ❶...

  • Page 86: Adjusting The Button Clamp Jaw Lever

    3-3. Adjusting the button clamp jaw lever WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Bring the machine to its stop-motion state. Then lift button clamp ❶ . Loosen screw ❷ in the button ❹...

  • Page 87: Adjustment Of The Pressure Of The Work Clamp Unit

    3-5. Adjustment of the pressure of the work clamp unit WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ❷ ❶ The pressure of the work clamp unit should be minimized as long as the material does not warp during sewing.

  • Page 88: Others

    4. OTHERS 4-1. Installing the save button bar (accessory part) WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 1) Install save button bar ❸ on button clamp base ❷...

  • Page 89: Attaching The Shank Button (Optional)

    4-3. Attaching the shank button (optional) (1) Specifications Model Optional Needle TQx3 #14 Shape of button Outside diameter Max. ø20 Diameter of hole Min. ø1.5 Position of hole 1.5 mm or more Shape of shank sec- ℓ(mm) tion Minimum Maximum ℓ...

  • Page 90: Sewing Machine

    (2) Adjusting the height of the needle bar WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ❶ ❸ 4.3mm ❷ 1) Loosen needle bar connection screw ❶ and move the needle bar ❷ up or down so that second en- graved marker line A as counted from the bottom is aligned with the bottom end of needlebar bushing ❸...
  • Page 91 (4) Adjusting the button clamp support WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Loosen setscrew ❶ , and place the button to be used in ❸...
  • Page 92 (7) Adjusting the button support rubber WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. To adjust the position of button support rubber asm. ❶ , loosen setscrews ❷ and ❸ , and adjust so that ❶...

  • Page 93: Bird's Nest Preventing And Shorter-Thread Remaining Type Thread Trimmer)

    V. EXPLANATION OF THE LK-1903BBS HIGH-SPEED COMPUTER- CONTROLLED FLAT BUTTON SEWING MACHINE (WITH THE BIRD'S NEST PREVENTING AND SHORTER-THREAD REMAINING TYPE THREAD TRIMMER) 1. SPECIFICATIONS Different specifications from those of the LK-1900B only are described. Max. sewing speed 2,700 sti/min Needle DPx17 #11, #14 Lift of the work clamp foot...

  • Page 94: Installing The Regulator And Solenoid Valve Asm

    2-2. Installing the regulator and solenoid valve asm. ❸ ❷ ❶ ❶ Mount the solenoid valve asm. and regulator asm. on the undersurface of the table respectively with two set- screws ❶ and two setscrews ❷ . Mount the solenoid valve asm., near cord through-hole ❸ (see the figure) in and regulator asm. on the far left section of the undersurface of the table as observed from the worker.

  • Page 95: Connecting The Cords

    2-4. Connecting the cords DANGER : To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine, carry out the work after turning OFF 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.

  • Page 96: Connecting The Air Piping

    2-5. Connecting the air piping WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. (1) Connecting the regulator and solenoid valve asm. Connect the coupling of the regulator ❶ and that of the solenoid valve asm. with air tube ø6 ❸ and Y-cou- pling ❷...
  • Page 97 (3) Assembling the air nozzle 1) Secure the air tube and cylinder sensor cords ❹ with cable clip ❶ . At this time, do not fix air tube ❶ ❹ together with the above. 2) Secure the air nozzle with cord clamps (small) ❷ . 3) Pass the secured air tubes and cylinder sensor cords through the air nozzle and cord clamp (large) ❸...

  • Page 98: Installing The Cloth Chip Bag

    2-6. Installing the cloth chip bag Put hose ❷ into cloth chip bag ❶ . Suspend the bag ❸ from the undersurface of the table with hanger ❸ . Suspend cloth chip bag ❶ from the lo- cation where the top of the hose ❷ is brought to the upper section of the bag.

  • Page 99: Needle And Thread

    2-8. Needle and thread Needle and thread will vary in accordance Needle Needle thread Bobbin thread with the sewing conditions. When using the ＃ 80 ＃ 80 DPx17 #11 needle and the thread, select them refer- ＃ 60 ＃ 80 DPx17 #14 ring to the left table.

  • Page 100: Adjustment Of The Sewing Machine

    (2) Selection of the sewing pattern and the sewing width ◦ Selection of the sewing pattern is the same as that of the LK-1900B. ◦ When the distance between holes of the button used does not fit the standard sewing width of the sew- ing pattern No., adjust the sewing width by enlarging/reducing the sewing width.

  • Page 101: Adjusting The Suction Pipe For The Shorter-Thread Remaining Type Thread Trimmer

    3-2. Adjusting the suction pipe for the shorter-thread remaining type thread trimmer When the compressed air is supplied, suction cylin- der ❶ for shorter-thread remaining type thread trim- mer moves backward. This is the initial position. Unless cylinder ❶ is in its recessed posi- tion when the pneumatic air is supplied, the piping connection is wrong.

  • Page 102: Replacing The Knife Of The Shorter-Thread Remaining Type Thread Trimmer

    3-3. Replacing the knife of the shorter-thread remaining type thread trimmer 1) Remove screws ❶ at four locations. Then, knife base ❷ can be removed. ❶ ❷ 2) Moving knife support plate ❹ and moving knife ❺ removed in the joined state by removing ❸...

  • Page 103: Adjusting The Work Clamp Rod (For 1903Bbs Only)

    3-4. Adjusting the work clamp rod (For 1903BBS only) Fit work clamp rod ❶ in the slit in button guide foot ❷ . Fix the work clamp rod with setscrew ❸ while pushing the rod upward. ❸ The correct position of work clamp rod ❶ is as shown below.

  • Page 104: Maintenance

    4. MAINTENANCE 4-1. Cleaning the inside of the hook cover Periodically clean the inside of the hook cover ❶ to remove dust and thread waste. ❶ 4-2. Cleaning the thread clamp When thread is caught at top end ❶ of the thread clamp, thread clamp becomes incomplete and sewing trouble at the sewing start will be caused.

  • Page 105: Explanation Of The Lk-1900Bb

    V I . E X P L A N AT I O N O F T H E L K - 1 9 0 0 B B C O M P U T E R - CONTROLLED, HIGH-SPEED BARTACKING MACHINE (WITH THE BIRD'S NEST PREVENTING AND SHORTER-THREAD REMAINING TYPE THREAD TRIMMER) This chapter only describes the items which are different from the LK-1903BBS.

  • Page 106: Preparation Of The Sewing Machine

    2. PREPARATION OF THE SEWING MACHINE 2-1. Table of the sewing patterns Sewing size Sewing size (Note 2) (Note 2) (mm) (mm) Stitch diagram Stitch diagram No. of work No. of work Length- Cross- Length- Cross- clamp foot clamp foot wise wise wise...
  • Page 107 Sewing Sewing (Note 2) (Note 2) size (mm) size (mm) Stitch diagram Stitch diagram No. of work No. of work clamp foot clamp foot Length- Cross- Length- Cross- wise wise wise wise ø12 ø8 Pattern Nos. 41 to 46 are for the optional work clamp foot No.

  • Page 108: Adjustment Of The Sewing Machine

    3. ADJUSTMENT OF THE SEWING MACHINE WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 3-1. Replacing the bird's nest preventing knife 1) Remove screws ❶ at four locations. Then, knife base ❷...

  • Page 109: Drawing Of The Table

     3-drilled hole 3, 10 deep on the rear side (power switch installing hole) ❷ Drawer stopper installing position (one place on the rear side)  Drilled hole 17  Drilled hole 28 ❸ JUKI logotype  R2 (all corners) ❹ 4- drilled hole 8  Right side ❺...
  • Page 110 ❷ Drawer stopper installing position (one place on the rear side)  3-drilled hole 3, 10 deep on the rear side (power switch installing hole) ❸ JUKI logotype  Drilled hole 17 ❹ 3- drilled hole 3, 10 deep on the rear side (pedal installing hole)  Drilled hole 28 ❺...

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