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The description covered in this engineer's manual is subject to change for improvement of the

commodity without notice.

01 · 08 Printed in Japan (E)

INTERNATIONAL SALES H.Q.

8-2-1, KOKURYO-CHO,
CHOFU-SHI, TOKYO 182-8655, JAPAN
PHONE : (81)3-3430-4001 to 4005
FAX : (81)3-3430-4909 • 4914 • 4984
TELEX : J22967

2001 JUKI CORPORATION.

Summary of Contents for LS-1340

Page 1: ... Lockstitch Machine Large Hook For heavy weight materials Max 2 500 rpm 50 to 8 40 to 5 30 to 5 30 to 5 Max 6 mm normal reverse feed Hand lifter 9 mm Knee lifter 16 mm By dial Lever type Slide thread take up 36 mm Ellipse feed Timing belt Central oil wick lubrication by tank partially by manual JUKI New Defrix Oil No 2 equivalent to ISO VG32 72mm 255 x 100 mm V belt effective diameter ø93 3 mm Out...

Page 2: ...A 60 mm A Top surface of throat plate Conditions Needle bar at lowest dead point Feed amount 0 mm Conditions Needle bar at lowest dead point Feed amount 0 mm Model Dimension A LS 1340 8 5 0 1 mm LS 1341 LS 1342 5 5 0 1 mm LS 1342 7 A Clearance between the feed dog and the throat plate when the feed dog travels fully to the front 1 2 a a ...

Page 3: ...d dog and contacting noise occurs and the throat plate or the feed dog may be damaged Irregular stitches may result Stitch skipping or needle breakage will result Poorly tensed stitches will result 1 Set the stitch dial to 0 mm 2 Turn the handwheel to bring the needle bar to the lowest dead point of its stroke 3 Loosen clamping screw 3 in the feed rocker 4 Move the feed base and adjust so that nee...

Page 4: ... dog 3 Lateral position of the feed dog 1 2 1 2 a a Conditions Needle bar at lowest dead point Feed amount 0 mm Conditions Feed amount 0 mm Height of feed dog is maximum 4 3 5 6 7 3 4 A Model Dimension A LS 1340 0 8 0 1 mm LS 1341 LS 1342 0 5 0 1 mm LS 1342 7 2 9 8 ...

Page 5: ... of the needle hole of feed dog 2 a a 10 After the adjustment securely tighten the setscrews When the height of the feed dog is higher than the specified value Stitch pitch becomes larger than the scale of the feed dial Balloon stitches will result Return of sewing product will occur When the height of the feed dog is lower than the specified value Stitch pitch becomes smaller than the scale of th...

Page 6: ...Dimension A LS 1340 0 01 to 0 06 mm LS 1341 LS 1342 0 to 0 05 mm LS 1342 7 Conditions Feed amount 0 mm 4 mm hexagonal wrench 3 5 2 4 0 2 mm 1 7 0 2 mm 5 5 3 0 02 to 0 05 mm A 6 Model Dimension B LS 1340 60 3 mm LS 1341 59 3 mm LS 1342 LS 1342 7 61 4 mm 7 8 B ...

Page 7: ...ad point of the needle bar 4 Loosen two setscrews 1 in the hook driving shaft saddle move the hook driving shaft in the direction of arrow and adjust the clearance between needle 5 and blade point 3 of the hook to dimension A 3 Needle to blade point of hook timing 1 Raise needle bar 7 by 2 4 mm from its lowest dead point turn the hook so that blade point 3 of the hook is aligned with the center of...

Page 8: ...ook guide 6 Height of the hook Model Dimension A LS 1340 1 7 to 2 2 mm LS 1341 LS 1342 1 4 to 2 0 mm LS 1342 7 1 2 A Conditions When the inner hook guide travels to its back end Press the inner hook stopper to the groove in the throat plate 1 2 3 4 5 0 1 to 0 3 mm A B ...

Page 9: ...ecified value Loose stitches or thread breakage will result When the clrarance is smaller than the specified value Inner hook or inner hook guide may be damaged Stitch skipping or thread breakage will result Needle breakage will result Irregular stitches will result 1 Turn the handwheel to bring inner hook guide 1 to its back end position 2 Turn inner hook 2 in the reverse direction of rotation of...

Page 10: ...ent 8 Lift of the presser foot 1 Hand lifter 2 Knee lifter 1 2 3 1 2 9 0 3 mm 16 0 5 mm Hand lifter Top surface of throat plate Condition State that the hand lifter is raised Top surface of throat plate To come in contact ...

Page 11: ...h and tilt the machine arm 2 Loosen stopper screw nut 1 and adjust the lifting amount by the screwing amount of stopper screw 2 Adjust the height from the top surface of the throat plate to the bottom face of the presser foot to 16 0 5 mm 3 Taking care not to move stopper screw 2 tighten stopper screw nut 1 Tighten stopper screw 2 Lifting amount is decreased Loosen stopper screw 2 Lifting amount i...

Page 12: ... Adjustment 9 Feed cam timing 1 Horizontal feed cam timing 1 2 3 Screw No 1 Main shaft Conditions Feed amount maximum Needle bar at lowest dead point LS 1340 and LS 1341 Needle to hook timing LS 1342 and LS 1342 7 ...

Page 13: ...ed eccentric cam faces almost right above at the lowest dead point of the needle bar In case of LS 1342 and LS 1342 7 1 Set the stitch dial to the maximum 2 Loosen two setscrews 1 in the horizontal feed eccentric cam 3 Turn the handwheel and adjust the needle bar to the position of the hook adjusting timing 5 Needle to hook timing 4 Turn feed eccentric cam 2 and adjust the timing so that the feed ...

Page 14: ...1341 In case of LS 1342 and LS 1342 7 Conditions Feed amount 6 mm When needle comes down 2 3 4 To align 1 5 Main shaft Screw No 1 6 Main shaft Top feed cam rod 7 1 8 9 0 To align Screw No 1 Top feed cam rod In case of LS 1342 7 Screw No 1 Top feed cam rod In case of LS 1342 ...

Page 15: ...he arrow mark In the direction of the small end of top feed cam rod 6 In case of LS 1342 and LS 1342 7 1 Set the stitch dial to 6 mm 2 Set the alternate vertical dial to 2 3 Remove the setscrews in the window plate remove window plate E LS 1342 or window plate F LS 1342 7 and window plate packing E 4 Loosen two setscrews 7 in the top feed cam 5 Turn top feed cam 1 to the position where three point...

Page 16: ...mm Lower engraved marker line Approx 3 mm Table of sewing speed In case of LS 1340 and LS 1341 In case of LS 1342 and LS 1342 7 refer to 3 2 1 Installing position of the detection switch of the amount of alternate vertical movement In case of LS 1342 and LS 1342 7 Operator s side Edge of machine arm To align with edge Top feed rear arm Amount of alternate vertical movement of the walking foot and ...

Page 17: ...of LS 1342 and LS 1342 7 1 Remove the top cover 2 Loosen setscrew 8 in the vertical adjusting arm 3 Adjust the position of vertical adjusting arm 5 to 73 to 74 mm from edge 6 of the machine arm and assemble it so that it aligns with the edge of vertical change base 7 in the lateral direction 4 Securely tighten setscrew 8 in the vertical adjusting arm 5 Set the alternate vertical dial to the minimu...

Page 18: ...p surface of feed dog Top surface of throat plate Top surface of throiat plate Conditions Feed amount 0 mm Amount of alternate vertical movement standard In case of LS 1340 and LS 1341 In case of LS 1342 and LS 1342 7 1 2 3 18 0 5 mm Horizontal feed shaft Engraved marker line Horizontal feed arm stopper ...

Page 19: ...he handwheel to make sure of the amount of alternate vertical movement of the walking foot and the presser foot Adjust the vertical stroke of the walking foot so that it is larger than that of the presser foot in accordance with the sewing products Sewing sponge material or the like Sewing material with overlapped sections When the alternative vertical strokes of the walking foot and presser foot ...

Page 20: ...1 only 12 Stitch length of normal reverse feed 1 2 1 3 1 2 A B Feed adjusting base Notch Feed adjusting rod Conditions Feed amount 6 mm Top feed driving rod To come in close contact with each other Main shaft intermediate bushing Both screws No 1 are aligned with each other 3 ...

Page 21: ...ews 1 in the feed adjusting eccentric pin Standard When the direction of the notch of feed adjusting eccentric pin 2 is set to the right sideway the feed amount of normal and reverse feeds are nearly the same Vibration is increased Respective stitch lengths of normal and reverse feeds do not match 1 Turn the handwheel to face the screw No 1 in horizontal feed cam 2 directly above 2 Adjust so that ...

Page 22: ... control lever 1 2 3 1 0 5 m m 1 52 5 1 mm In case of LS 1342 7 In case of LS 1340 LS 1341 and LS 1342 Stitch dial Stitch dial Reverse feed control lever Feed regulator Reverse feed lever shaft Standard Adjustment 15 Safety clutch 1 2 A B To be almost flush ...

Page 23: ... high Reverse feed control lever interferes with the stopper or the machine arm and stitch length of the normal feed stitching will be decreased Adjustment Procedures Results of Improper Adjustment The safety clutch functions when an excessive load is applied to the hook driving shaft or the like during sewing When the safety clutch functions the hook will not rotate even if turning the handwheel ...

Page 24: ...trimmer device 1 Vertical position of the moving knife 2 Position of the fixed knife 1 2 1 2 5 t o 6 m m For the selective parts of moving knife base thrust plate 2 refer to 6 Selective parts and consumable parts 1 3 0 1 mm 1 2 3 4 1 6 0 1 mm 0 to 0 5 m m Start of knife pressure Initial position ...

Page 25: ...t together Initial position When the play at the top end of the moving knife is 0 to 1 mm the distance from the top end of the moving knife to the top end of the fixed knife is 0 to 0 5 mm when the moving knife travels to the rear end Loosen setscrew 4 in the moving knife arm and move the moving knife base to adjust the initial position When the knife pressure is excessively high Blade sections of...

Page 26: ...ion of the solenoid 4 Thread trimmer cam 1 2 3 4 5 0 05 to 0 15 mm To come in close contact with each other To come in close contact with each other Hook driving shaft 1 5 4 1 2 3 Follower arm To come in close contact with each other ...

Page 27: ...h the top end of the fixed knife becomes the initial position At this time check that the clearance between plunger stopper 3 of the thread trimmer solenoid and solenoid main body 4 is 0 05 to 0 15 mm 1 Move the moving knife to the rear end 2 Move forward the top end of the moving knife by 0 5 to 1 mm 3 In this state make the edge of thread trimmer cam 1 come in close contact with thread trimmer c...

Page 28: ...5 mm 4 75 mm to less than 6 5 mm Stitch length 6 mm or less 2500 rpm 2200 rpm 1800 rpm 1600 rpm Sewing speed of LS 1342 and LS 1342 7 Standard Adjustment 5 Thread trimmer cam timing 1 Installing position of the detection switch of the amount of alternate vertical movement Engraved marker dot on machine arm Red engraved marker dot Handwheel 1 2 3 4 To come in close contact with each other Hook driv...

Page 29: ...n between the alternate vertical dial and the sewing speed is normal Sewing speed may not change even when turning the alternate vertical dial Adjustment Procedures Results of Improper Adjustment 1 Turn the handwheel to align the red engraved marker dot on the handwheel with the engraved marker dot on the machine arm 2 Make thread trimmer cam 1 come in close contact with thrust pad 2 3 In this sta...

Page 30: ...uring No Mfg No is 1 Select LU 22 0 LU2S from the table of simplified setting value Select program mode 1 A B Caution Do not select LU2v The alternate vertical movement amount device does not work normally with LU2v 2 Change the parameters below For the selection of each program mode from the normal mode and the details of functions refer to the Engineer s Manual for the SC 380 1 Normal mode slow ...

Page 31: ...r tacking Remarks Stop before tacking Tacking compensation Start tacking ON compensation Start tacking OFF compensation End tacking OFF compensation Symbol CSJ BM BT1 BT2 BT3 Initial value OFF OFF C 2 5 Modified value ON ON 1 0 2 Function name Starting angle of thread trimming output Section of thread trimming output Starting angle of tension release output Section of tension release output Remark...

Page 32: ...ed at anti operator s side of the machine arm 2 Remove window plate B 2 3 Remove window plate packing B 3 Hand wheel Window plate A 2 Removing the reverse feed control lever Removing parts list 1 Loosen the respective setscrews in the belt cover and remove the belt cover 2 Remove two setscrews 4 in the reverse feed control lever 3 Remove reverse feed control lever 5 Stitch dial Part No SS4110815SP...

Page 33: ... link enters under the reverse feed control lever 5 Hook lever return spring 8 to the lever spring bracket 1 and the tension spring bracket 6 Adjust the position of the reverse feed control lever For the adjusting procedure refer to 14 Position of the reverse feed control lever Reverse feed control lever Part No 226563003 SS4120615SP 11100500 SS7112420SP 10120004 22656102 SS7120760SP 13515606 WP05...

Page 34: ...e piston rod of reverse feed cylinder 4 by hand and tighten setscrew 3 so that reverse feed cylinder 4 smoothly moves 8 Tighten the window plate packing B and window plate D 0 in order with the setscrew At this time enter the groove of reverse feed link 2 the reverse feed link hinge screw 3 on the side of the feed regulator connecting rod 9 Insert the air hose into straight joint 5 1 2 3 4 5 6 7 8...

Page 35: ...1 1 2 1 2 Table Part No 21348859 SS7110840SP No 1 2 Note Name of part Touch back switch Switch installing plate setscrew Q ty 1 2 Part No 23105554 SK3482500SC No 1 2 Note Name of part Pneumatic components asm Setscrew Q ty 1 4 Part No 21348552 No Note Name of part Automatic reverse feed device set Q ty 1 Installing parts list of touch back switch List 4 Installing parts list of pneumatic component...

Page 36: ...Fot the models other than LS 1342 7 install pneumatic components asm 1 9 Insert the air hose and check the operation When actuating the automatic presser foot lifter make sure that the distance from the bottom face of the presser foot to the top surface of the throat plate is 16 0 5 mm When adjustment is required remove automatic presser foot lifter lever shaft9 and automatic ptresser foot foot li...

Page 37: ... the pin terminal male into the plug CN1 Insert it after making sure of the inserting position Pneumatic device used AK 120A and AK 120B Install pneumatic components asm 1 as listed Specifications of the pneumatic device AK A Knee switch type AK B Pedal switch type CN1 3 6 9 1 4 7 1 2 CN1 5 CN1 6 CN1 1 CN1 2 CN1 4 Red Black White Red Black Part No GAKA14010A0 No 1 Note Name of part Pneumatic compo...

Page 38: ... asm Q ty 1 1 1 Installing parts list Applicable model LS 1342 7 LS 1340 41 LS1342 Part No GAKA14040D0 SK3514000SC No 1 2 Note Name of part Presser foot lifter knee switch B asm Wood screw Q ty 1 2 Kit A Knee lifter switch Part No GAKA2302E00 D6043555B0 BT0600401EB HX00295000A HX00295000B No 1 2 3 4 5 Note Name of part Solenoid valve E Pin terminal male Air hose Wire mark 2 Wire mark 3 Q ty 1 2 2 ...

Page 39: ... 5 7 When installing window plate F 7 enter alternate vertical link hinge screw 5 to the hole of alternate vertical link 2 and attach it to the machine arm 8 Install the pneumatic device components asm 9 Install the 5 step switch asm and connect the relay cord with it 10 Insert the air hose and check the operation When actuating DL the amount of the alternate vertical movement becomes maximum and ...

Page 40: ... lifter shaft pedal type 6 7 8 9 0 1 2 1 2 3 4 5 To come in contact with each other To align the edges with each other To come in contact with each other Part No 21339601 21437108 No 1 2 Note Name of part Top feed stopper plate A Window plate E Q ty 1 1 Removing parts list of DL device Part No GDL21000AB0 No 1 Note Name of part Kit DL 21 Without AK knee switch Q ty 1 Installing parts list of DL de...

Page 41: ... the edge of the machine bed 7 Make the knee lifter stopper arm come in contact witk the boss section of the knee lifter shaft and securely tighten the setscrew 8 In the state of the above step 7 make the knee lifter arm come in contact with thruast pad 6 of the knee lifter shaft and securely tighten the setscrew 9 Hook knee lifter spring 1 on spring pin 2 10 Combine presser lifter arm 7 with pres...

Page 42: ... which has been assembled at the step 3 to the binder installing section on the machine bed 5 Remove the throat plate and the feed dog and install feed dog 0 and throat plate 1 6 Remove the presser foot asm and the walking foot asm and install walking foot 3 and presser foot asm 2 Walking foot 3 setrscrew 4 7 Remove the knee press plate and tilt the machine head 8 Draw out the hook driving shaft r...

Page 43: ...S 1341 LS 1342 LS 1340 41 LS 1342 LS 1340 LS 1341 LS 1342 LS 1340 LS 1341 LS 1342 LS 1340 41 42 Part No MAQ14303000 21232004 SD0721112SN MAQ09206000 SS7110510SP MAQ14302000 SS7110510SP MAQ09204000 MAQ09205000 MAQ14306000 SS6110710TP 21445200 No 1 2 3 4 5 6 7 8 9 0 4 5 Note Name of part Feed plate B Feed plate presser spring Feed plate hinge screw Tape guide Tape guide setscrew Feed plate A compl F...

Page 44: ...led be sure to wash the LOCKTITE applied part using a paint thinner or the like and re assemble it using LOCKTITE after removing any moisture from the mating faces If it is hard to remove a part which has been fixed using LOCKTITE heat it using a torch lamp or the like to help remove the part No 1 Alternate dial shaft bushing LOCKTITE applied Top cover B No 2 Vertical change base arm pin LOCKTITE ...

Page 45: ...el Needle MC372001600 SCHMETZ DP X 17 Nm 160 LS 1341 42 42 7 Needle MC372001400 SCHMETZ DP X 17 Nm 140 LS 1340 Hook asm B18013400A0 Latch hook LS 1340 Hook asm 21431358 Cap hook LS 1341 Hook asm 21431457 Latch hook LS 1342 Hook asm 21441753 Latch hook LS 1342 7 Bobbin B9117051000 LS 1340 Bobbin B9114201000 LS 1341 42 Bobbin 10759603 Aluminum bobbin LS 1342 7 Name of selective part Part No Marking ...

Page 46: ...1340 41 1 Tie oil wicks in oil tank as shown in the illustration above 2 Oil wick to hook driving shaft front bushing 3 Oil wick to vertical feed rod Tie the end of oil wick as shown in the illustration above 4 Tube and oil wick to hook shaft saddle Tie the end of oil wick in oil tank as shown in the illustration above 5 Vertical feed rod felt 6 Enter oil wick under hook shaft saddle felt Upper si...

Page 47: ...the blade point of hook is too large Thread is pushed and cut by the presser foot and the corner of throat plate Check the sharp edge or burr on the respective parts Check the clearance Check the clearance Check the specified dimension Check the clearance Remove the sharp edges or burrs on the blade point of hook using a fine emery paper Buff up the groove section on the throat plate Adjust the ne...

Page 48: ...pecified dimension Check the pressure of the presser foot Check the lowest point of the needle bar Check the blade point of the hook Check the functional amount of the needle guard Refer to 5 Needle to hook timing Refer to 5 Needle to hook timing Tighten the presser spring regulator Refer to 5 Needle to hook timing Correct the blade point of the hook or replace the hook Replace the needle with one...

Page 49: ...he thread take up spring Check the finish of the respective thread paths Check the change of bobbin thread tension Check the state of bobbin winding Refer to 7 Adjusting the inner hook guide Finish using a fine emery paper or buff Replace the bobbin or the hook Use the optional walking foot and presser foot Refer to 4 Height of the feed dog Lower the height by 0 2 mm than the standard value Retard...

Page 50: ...he moving knife and the hook Position of the clamp spring Pressure of the clamp spring is too low There are scratches on the clamp spring Needle thread removes bobbin thread Thread the needle thread correctly Make the winding of the thread guide once Decrease the tension given by the tension controller No 1 Adjust so that the disk is raised by means of the thread release solenoid Refer to 5 Thread...

Page 51: ...cient The blades of moving knife and fixed knife have b e e n i m p r o p e r l y adjusted The blades of moving knife and fixed knife have wom out or broken Thread trimming timing is excessively retarded Pressure of the fixed knife is insufficient Thread is too thick Thread trimming timing is excessively retarded Needle thread tension is too high Refer to the Cause Needle thread remaining at the n...

Page 52: ...htofmoving knife The blades of moving knife and fixed knife have been improperly adjusted Pressure of the fixed knife is too low Moving knife fails to work Adjust the tension of bobbin thread Refer to 2 Adjusting the knife pressure Refer to 5 Thread trimmer cam timing Refer to Causes Thread cannot be trimmed and Thread remains uncut after trimming Refer to 5 Needle to hook timing Refer to 5 Thread...

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Page 55: ...6 R 1 6 R6 R 1 0 R6 R 1 0 R6 R 1 0 R 1 0 R 1 0 R 6 R 1 0 R 1 0 X X R2 R2 Installing position of stopper for drawer on the bottom surface 4 ø3 6 depth 10 Drill a hole on the bottom surface at the time of set up JUKI logotype Center line of hook driving shaft 16 drilled hole depth 30 4 8 5 drilled hole 32 drilled hole C1 5 chamfer on the bottom surface 2 R20 2 ø3 4 depth 10 Drill a hole on the botto...

Page 56: ...h Machine Standard Hook LS 1340 Cylinder bed 1 Needle Unison Feed Lockstitch Machine Large Hook LS 1341 Cylinder Bed 1 Needle Unison Feed Lockstitch Machine Large Hook LS 1342 Cylinder Bed 1 Needle Unison Feed Lockstitch Machine with Automatic Thread Trimmer Large Hook LS 1342 7 ...

Page 57: ...levant Instruction Manual and Parts List together with this Engineer s Manual when carrying out the maintenance service of this machine Regarding the motor for the sewing machine with automatic thread trimmer separately refer to the Instruction Manual for the motor and Engineer s Manual In addition for the control panel refer to the Instruction Manual for the control panel This manual gives the St...

Page 58: ...cam timing 28 2 Alternate vertical dial 28 1 Installing position of the detection switch of the amount of alternate vertical movement 28 3 Adapting SC 380 to LS 1342 1342 7 30 4 INSTALLATION OF THE OPTIONAL PARTS 32 1 Automatic reverse feed device LS 1340 LS 1341 LS1342 32 1 Removing the window plate Removing parts list 32 2 Removing the reverse feed control lever Removing parts list 32 3 Installi...

Page 59: ...PORTION TO WHICH LOCKTITE IS APPLIED 44 6 SELECTIVE PARTS AND CONSUMABLE PARTS 45 7 ENGRAVED MARKER DOTS ON THE HANDWHEEL 46 8 LUBRICATION ROUTE DIAGRAM 46 9 TABLE OF TROUBLES AND CORRECTIVE MEASURES 47 1 With reagard to sewing 47 2 With regard to thread trimming 50 10 DRAWING OF THE TABLE 55 ...

Page 60: ...n this engineer s manual is subject to change for improvement of the commodity without notice 01 08 Printed in Japan E R INTERNATIONAL SALES H Q 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHONE 81 3 3430 4001 to 4005 FAX 81 3 3430 4909 4914 4984 TELEX J22967 Copyright C 2001 JUKI CORPORATION All rights reserved throughout the world ...

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