JUKI LS-1340 Manual
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JUKI LS-1340 Manual

JUKI LS-1340 Manual

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1. SPECIFICATIONS

No.
Item
1
Model
2
Model name
3
Application
4
Sewing speed
5
Needle
6
Thread possible to be
sewn
7
Thread possible to be
trimmed
8
Stitch length
9
Presser foot lift
10
Stitch length adjusting
mechanism
11
Reverse stitch adjusting
method
12
Thread take-up
13
Needle bar stroke
14
Alternate foot stroke
15
Hook
16
Feed mechanism
17
Top and bottom feed
actuation mechanism
18
Thread trimming
mechanism
19
Lubrication
20
Lubricating oil
21
Cylinder bed diameter
22
Free space for sewing
23
Size of handwheel
24
Motor
LS-1341
LS-1340
Cylinder-Bed, 1-
Cylinder-Bed, 1-Needle, Unison
Needle, Unison
Feed, Lockstitch Machine
Feed, Lockstitch
(Large Hook)
Machine
(Standard Hook)
For heavy-weight materials
SCHMETZ 135
X 17 Nm 100 to
SCHMETZ 135 X 17 Nm 100 to 180 Standard : Nm 160
180 Standard :
Nm 140
#50 to #8
Max. 6 mm (normal/reverse feed)
Hand lifter : 9 mm
Lever type
2.5 mm to 6.5 mm Slot adjusting type
Full-rotary vertical-
Full-rotary vertical-
axis standard hook
axis 1.6-fold hook
(Latch type)
(Cap type)
Central oil wick lubrication by tank (partially by manual)
JUKI New Defrix Oil No. 2 (equivalent to ISO VG32)
V belt effective diameter : ø93.3 mm
4P, 400W
1
− 
−
Specifications
LS-1342
Max. 2,500 rpm
#40 to #5
Knee lifter : 16 mm
By dial
Slide thread take-up
36 mm
1 mm to 6.5 mm Alternate foot stroke
adjusted by dial
Full-rotary vertical-axis 1.6-fold hook
(Latch type)
Ellipse feed
Timing belt
72mm
255 x 100 mm
Outer diameter : ø160 mm
LS-1342-7
Cylinder-Bed, 1-
Needle, Unison
Feed, Lockstitch
M a c h i n e w i t h
A u t o m a t i c
Thread Trimmer
(Large Hook)
#30 to #5
#30 to #5
Air cylinder type
(with touch-back
switch)
Cam-driven
scissors type
SC-380

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Summary of Contents for JUKI LS-1340

  • Page 1: Specifications

    Thread trimming Cam-driven mechanism scissors type Central oil wick lubrication by tank (partially by manual) Lubrication JUKI New Defrix Oil No. 2 (equivalent to ISO VG32) Lubricating oil 72mm Cylinder bed diameter 255 x 100 mm Free space for sewing V belt effective diameter : ø93.3 mm...

  • Page 2: Standard Adjustment

    : Feed amount : 0 mm Top surface of throat plate Model Dimension A 8.5 ±0.1 mm LS-1340 LS-1341 5.5 ±0.1 mm LS-1342 LS-1342-7 (2) Longitudinal position of the feed dog Standard Adjustment Conditions : Needle bar at lowest dead point...
  • Page 3 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “0 mm”. ™ Stitch skipping or needle breakage will result. 2. Turn the handwheel to bring the needle bar to the lowest dead ™ Poorly tensed stitches will result. point of its stroke.

  • Page 4: Lateral Position Of The Feed Dog

    : Feed amount : 0 mm (4) Height of the feed dog Standard Adjustment Conditions : Feed amount : 0 mm : Height of feed dog is maximum. Model Dimension A 0.8 ±0.1 mm LS-1340 LS-1341 0.5 ±0.1 mm LS-1342 LS-1342-7 −  −...
  • Page 5 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “0 mm”. ™ S t i t c h s k i p p i n g o r t h r e a d 2. Remove throat plate and throat plate base. breakage will result.

  • Page 6: Needle-To-Hook Timing

    (5) Needle-to-hook timing Standard Adjustment 4 mm hexagonal wrench Conditions : Feed amount : 0 mm Model Dimension A LS-1340 0.01 to 0.06 mm LS-1341 LS-1342 0 to 0.05 mm LS-1342-7 0.02 to 0.05 mm Model Dimension B LS-1340 60.3 mm LS-1341 59.3 mm...
  • Page 7 Adjustment Procedures Results of Improper Adjustment ™ Stitch skiping or thread breakage 1) Standard of the lowest dead point of the needle bar 1. Set the stitch dial to 0 mm. will result 2. Turn the handwheel to bring needle bar 7 to the lowest dead ™...

  • Page 8: Height Of The Hook

    (6) Height of the hook Standard Adjustment Model Dimension A LS-1340 1.7 to 2.2 mm LS-1341 LS-1342 1.4 to 2.0 mm LS-1342-7 (7) Adjusting the inner hook guide Standard Adjustment Conditions : When the inner hook guide travels to its back end.
  • Page 9 Adjustment Procedures Results of Improper Adjustment 1. Clearance provided between inner hook stopping section 1 in ™ S t i t c h s k i p p i n g o r t h r e a d the throat plate and top surface 2 of inner hook stopper section breakage will result.

  • Page 10: Lift Of The Presser Foot

    (8) Lift of the presser foot Standard Adjustment 1) Hand lifter Hand lifter Condition • State that the hand lifter is raised Top surface of throat plate 2) Knee lifter To come in contact Top surface of throat plate −  −...
  • Page 11 Adjustment Procedures Results of Improper Adjustment 1. Loosen setscrew 1 in the side cover located on the When the lifting amount is higher antioperator’s side of the machine arm and remove side cover than the specified value : ™ The presser foot is held raised 2.

  • Page 12: Feed Cam Timing

    (9) Feed cam timing Standard Adjustment 1) Horizontal feed cam timing Main shaft Screw No. 1 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 1) Horizontal feed cam timing ™ Pitch error at high or low speed will be deteriorated. ™ In case of LS-1340 and LS-1341 : ™ Thread tension will vary. 1. Set the stitch dial to the maximum. ™ Stitch tightness at normal and 2.

  • Page 14: Top Feed Cam Timing

    Standard Adjustment 2) Top feed cam timing ™ In case of LS-1340 and LS-1341 Conditions : Feed amount : 6 mm : When needle comes down. Main shaft Screw No. 1 To align ™ In case of LS-1342 and LS-1342-7 ™...
  • Page 15 2) Top feed cam timing ™ Pitch error at high or low speed will be deteriorated. ™In case of LS-1340 and LS-1341 1. Set the stitch dial to “6 mm”. 2. Adjust the amount of alternate vertical movement to the standard value.

  • Page 16: Feed Motion

    (10) Feed motion Standard Adjustment 1) Amount of alternate vertical movement ™ In case of LS-1340 and LS-1341 Top feed rear arm Table of sewing speed ™ In case of LS-1340 and LS-1341 Amount of alternate vertical Stitch length :...
  • Page 17 1) Amount of alternate vertical movement Increase the vertical stroke of the walking foot in accordance with the ™In case of LS-1340 and LS-1341 sewing products. 1. Loosen hinge screw nut 1 in the top feed rod. ™ Sewing sponge material or the 2.

  • Page 18: Alternate Momentum

    Top surface of Top surface of throiat plate throat plate ™In case of LS-1342 and LS-1342-7 ™In case of LS-1340 and LS-1341 (11) Horizontal feed arm Standard Adjustment Horizontal feed shaft Horizontal feed arm stopper 18±0.5 mm Engraved marker line − ...
  • Page 19 Adjustment Procedures Results of Improper Adjustment 2) Alternate momentum Adjust the vertical stroke of the 1. Set the stitch dial to “0”. walking foot so that it is larger than that of the presser foot in accordance 2. Turn the handwheel to make sure that the amount of alternate vertical movement of walking foot 1 and presser foot 2 is with the sewing products.

  • Page 20: Stitch Length Of Normal/Reverse Feed

    Standard Adjustment Conditions : Feed amount : 6 mm Feed adjusting base Notch Feed adjusting rod (13) Balancer (LS-1340 and LS-1341 only) Standard Adjustment Both screws No. 1 are aligned with each other. To come in close contact with each other...
  • Page 21 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “6 mm”. ™ Respective stitch lengths of 2. Loosen two setscrews 1 in the feed adjusting eccentric pin. normal and reverse feeds do not 3. Turn feed adjusting eccentric pin 2 to adjust the stitch length. match.

  • Page 22: Position Of The Reverse Feed Control Lever

    (14) Position of the reverse feed control lever Standard Adjustment ™ In case of LS-1342-7 ™ In case of LS-1340, LS-1341 and LS-1342 Stitch dial To be almost flush Stitch dial Reverse feed control lever Feed Reverse feed lever shaft...
  • Page 23 2. reverse feed stitching will be decreased. ™ In case of LS-1340, LS-1341 and LS-1342 When the position of the reverse 1. Set the stitch dial to “0 mm”. feed control lever is high : 2.

  • Page 24: Standard Adjustment Of Thread Trimmer Components (Ls-1342-7)

    3. STANDARD ADJUSTMENT OF THREAD TRIMMER COMPONENTS (LS-1342-7) (1) Thread trimmer device Standard Adjustment 1) Vertical position of the moving knife For the selective parts of moving knife base thrust plate 2, refer to “6. Selective parts and consumable parts”. 2) Position of the fixed knife Start of knife pressure ™...
  • Page 25 Adjustment Procedures Results of Improper Adjustment 1. Loosen setscrew 1 in the moving knife. When the clearance is larger than 2. Select moving knife base thrust plate 2 so that the clearance the specified value : between the top surface of the bobbin case and the bottom ™...

  • Page 26: Position Of The Solenoid

    Standard Adjustment 3) Position of the solenoid To come in close contact with each other 0.05 to 0.15 mm 4) Thread trimmer cam Follower arm To come in close contact with each other Hook driving shaft To come in close contact with each other − ...
  • Page 27 Adjustment Procedures Results of Improper Adjustment 1. Make follower arm 1 come in close contact with the edge of boss section 2 of the safety device. 2. In this state, install thread trimmer solenoid arm 5 so that a clearance of 0.05 to 0.15 mm is provided between plunger stopper 3 (roll pin) of the thread trimmer solenoid and solenoid main body 4.

  • Page 28: Thread Trimmer Cam Timing

    Standard Adjustment 5) Thread trimmer cam timing Engraved marker dot Red engraved To come in close contact on machine arm marker dot with each other Hook driving shaft Section R comes in close contact with thread trimmer cam roller. Handwheel Conditions : Engraved marker dot on handwheel is aligned with engrared marker dot on machine arm.
  • Page 29 Adjustment Procedures Results of Improper Adjustment 1. Turn the handwheel to align the red engraved marker dot on When the timing is retarded : the handwheel with the engraved marker dot on the machine ™ Thread trimming action does not arm.

  • Page 30: Adapting Sc-380 To Ls-1342/1342-7

    In case of “********* A” (in case there is “LU56” of the model LU-1560 is in the table of simplified setting value for JUKI sewing machine of SC-380) and in case of “*********” (in case there is no “LU56” of the model LU- 1560 in the table of simplified setting value for JUKI sewing machine of SC-380), the contents to be set are different.
  • Page 31 3 C mode (selection : ↓ + C) : setting of input Function name Symbol Initial value Modified value Remarks Refer to (Caution) . Change-over of input signal function (Caution) In case of the machine head with 2-pitch device, set as IF = IO4, IFA = ON and OB = OT4. 4 D mode (selection : ↓...

  • Page 32: Installation Of The Optional Parts

    4. INSTALLATION OF THE OPTIONAL PARTS (1) Automatic reverse feed device (LS-1340, LS-1341, LS1342) 2) Removing the reverse feed control lever 1) Removing the window plate (Removing parts list) (Removing parts list) Hand Window plate A wheel Stitch dial 1. Loosen the respective setscrews in the belt cover 1.

  • Page 33: Installing The Reverse Feed Control Lever (List 2)

    4) Installing the reverse feed control lever (List 2) Reverse feed control lever 1. Install reverse feed control lever spring bracket 1 with setscrew 2. 2. Install reverse feed control lever stopper 3 to the machine arm with setscrew 4 and washer 9. 3.

  • Page 34: Installing The Automatic Reverse Feed Device (List 3)

    5) Installing the automatic reverse feed device (List 3) 1. Install reverse feed link 2 to reverse feed link installing base 1 with reverse feed link hinge screw 2. Install straight joint 5 to the inlet port of reverse feed cylinder 4 and install muffler 6 to the exhaust port.

  • Page 35: Installing The Touch-Back Switch (List 4)

    6) Installing the touch-back switch (List 4) 1. Install touch-back switch 1 with switch installing plate setscrew 2 . ◎ Installing parts list of touch-back switch (List 4) Note Part No. Name of part Q’ty 21348859 Touch-back switch SS7110840SP Switch installing plate setscrew 7) Installing the pneumatic components (In case of installing the touch-back switch only) (List 5) 1.

  • Page 36: Automatic Presser Foot Lifter

    (2) Automatic presser foot lifter 1) Installing the automatic presser foot lifter !4 !5 1. Remove the side plate located on the anti-operator’s side of the machine arm. (List of the parts to be removed) 2. Install two elbows !0 to automatic presser foot lifter cylinder 1. 3.

  • Page 37: Installing The Pneumatic Device Components

    CN1-1 CN1-2 CN1-4 White ◎ When installing the automatic presser foot lifter only to LS-1340, LS-1341 and LS-1342 after set-up of the machine ™ Pneumatic device used : AK-120A and AK-120B • Install pneumatic components (asm.) 1 as listed. ※ Specifications of the pneumatic device •...
  • Page 38 Part No. Name of part Q’ty Applicable model GAKA2302EB0 AK device (asm.) LS-1342-7 GAKA20010A0 AK device (asm.) with knee switch LS-1340/41 GAKA20010B0 AK device (asm.) LS1342 ◎ Kit A (Knee lifter switch) Note Part No. Name of part Q’ty GAKA14040D0 Presser foot lifter knee switch B (asm.)

  • Page 39: Dl Device (Ls-1342)

    (3) DL device (LS-1342) 1) Installing the DL device 2) Installin procedure of the DL device after set-up of the machine 1. Remove the window plate E located on the anti-operator’s side of the machine arm. 2. Attach elbow 2, muffler 3, cylinder connecting screw 4, alternate vertical link hinge screw 5 and nut 6 to jig cylinder 1.

  • Page 40: Installing The 5-Step Switch

    ◎ Removing parts list of DL device Note Part No. Name of part Q’ty 21339601 Top feed stopper plate A 21437108 Window plate E ◎ Installing parts list of DL device Note Part No. Name of part Q’ty GDL21000AB0 Kit DL-21 (Without AK knee switch) 3) Installing the 5-step switch Attach 5-step switch (asm.) 1 with setscrews 2.

  • Page 41: Installing Procedure Of The Knee Lifter Shaft (Pedal Type) After Set-Up Of The Machine

    1) Installing procedure of the knee lifter shaft (pedal type) after set-up of the machine 1. Remove the knee press plate (asm.) and tilt the machine head. 2. Remove knee lifter spring 1 from spring pin 2. 3. Loosen setscrew 3 in the knee lifter stopper arm. 4.

  • Page 42: Binder Kit

    (5) Binder kit 1) Installing procedure of the binder kit after set-up of the machine 1. Attach tape guide 4 to feed plate B 1 with tape guide setscrew 5. 2. Attach binder setscrews 8 to feed plate A 6 and attach binder lock nuts 9 to binder setscrews 8. 3.
  • Page 43 Vertical feed cam LS-1340/41/42 ◎ Installing parts list of the binder kit Note Part No. Name of part Q’ty 21434758 LS-1340 binder set 21434857 LS-1341 binder set 21434956 LS-1342 binder set ◎ Common parts Note Part No. Name of part Q’ty...

  • Page 44: Portion To Which Locktite Is Applied

    5. PORTION TO WHICH LOCKTITE IS APPLIED LOCKTITE has been applied to the following parts at the time of assembly at the factory.When an assembly which includes the aforementioned parts has been disassembled, 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.

  • Page 45: Selective Parts And Consumable Parts

    Name of consumable part Part No. Remarks Model 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...

  • Page 46: Engraved Marker Dots On The Handwheel

    Adjustment of thread trimmer cam (red) 8. LUBRICATION ROUTE DIAGRAM LS-1342/42-7 LS-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.

  • Page 47: Table Of Troubles And Corrective Measures

    9. TABLE OF TROUBLES AND CORRECTIVE MEASURES (1) With reagard to sewing Troubles Causes Checking Corrective measures Thread breakage Thread path, needle Check the sharp edge or Remove the sharp edges or burrs point, hook blade point or burr on the respective on the blade point of hook using i n n e r h o o k r e s t i n g parts.
  • Page 48 Troubles Causes Checking Corrective measures Stitch skipping Clearance between the Check the clearance. Refer to “(5) Needle-to-hook needle and the blade timing”. point of hook is too large. Needle-to-hook timing is Check the specified Refer to “(5) Needle-to-hook excessively advanced or dimension.
  • Page 49 Troubles Causes Checking Corrective measures Loose stitches Clearance between the Check the clearance. Refer to “(7) Adjusting the inner (Balloon stitches or isolated inner hook guide and the hook guide”. idling loop) protruding section of inner hook is too large. Thread paths have been Check the finish of the Finish using a fine emery paper or...

  • Page 50: With Regard To Thread Trimming

    (2) With regard to thread trimming Troubles Causes Checking Corrective measures One or serveral stitches Thread remaining at the Check the routing of T h r e a d t h e n e e d l e t h r e a d skip at the start of sewing.
  • Page 51 Troubles Causes Checking Corrective measures Thread slips off the needle Needle thread slips off the C h e c k w h e t h e r t h e Refer to the Cause “Needle eyelet. needle eyelet immediately needle thread remaining thread remaining at the needle top after thread trimming.
  • Page 52 Troubles Causes Checking Corrective measures From the previous page From the previous page Adjust the tension of bobbin Tension of the bobbin thread is too high. thread. Refer to “2) Adjusting the knife Knife pressure of the fixed pressure ”. knife is too high.
  • Page 53 − −...
  • Page 54 − −...

  • Page 55: Drawing Of The Table

    C1.5 chamfer on the bottom surface 32 drilled hole Center line of hook driving shaft JUKI logotype 4-8.5 drilled hole 2-ø3.4, depth 10 (Drill a hole on the bottom surface at the time of set-up.) X-X (1 : 1) ø26 □...
  • Page 56 Cylinder bed, 1-Needle, Unison Feed, Lockstitch 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...
  • Page 57 PREFACE This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance of the machine. The Instruction Manual for this machine 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 in the Instruction Manual.

  • Page 58: Table Of Contents

    (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) Installing the reverse feed link hinge screw (List 1) ..............
  • Page 59 (5) Binder kit ....................... 42 1) Installing procedure of the binder kit after set-up of the machine ..........42 5. PORTION TO WHICH LOCKTITE IS APPLIED........44 6. SELECTIVE PARTS AND CONSUMABLE PARTS ........ 45 7. ENGRAVED MARKER DOTS ON THE HANDWHEEL ......46 8.
  • Page 60 ＊ The description covered in this engineer's manual is subject to change for improvement of the TELEX : J22967 commodity without notice. Copyright C 2001 JUKI CORPORATION. All rights reserved throughout the world. 01 · 08 Printed in Japan (E)

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