JUKI LU-1510N-7 Engineer's Manual

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Engineer's manual (80 pages)

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Summary of Contents for JUKI LU-1510N-7

Page 1 1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE (AUTOMATIC LUBRICATION) LU-1510N 1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE WITH AUTOMATIC THREAD TRIMMER (AUTOMATIC LUBRICATION) LU-1510N-7, LU-1511N-7 1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE WITH AUTOMATIC THREAD TRIMMER (SPECIFICATION FOR LIGHT-WEIGHT MATERIALS)•(AUTOMATIC LUBRICATION) LU-1510NA-7 1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE...
Page 2 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 these machines intended for the maintenance personnel and operators at an apparel factory contains operating instructions in detail. And this manual describes “Standard Adjustment”, “Adjustment Procedures”, “Results of Improper Adjustment”, and other important information which are not covered in the Instruction Manual.
Page 3: Table Of Contents
CONTENTS 1. SPECIFICATIONS ..................1 2. STANDARD ADJUSTMENT ................(1) Needle entry position ....................8 (2) Longitudinal position of the feed dog ..............8 (3) Lateral position of the feed dog ................10 (4) Height of the feed dog ..................... 10 (5) Height of the hook ....................
Page 4 3. INSTALLATION OF THE OPTIONAL PARTS ..........(1) DL device (For the machine with thread trimmer only) .......... 52 (2) Thread trimmer Ver.UP set (Part No. for 1-needle : 21389259, Part No. for 2-needle : 21389267) ....53 (3) Bobbin thread remaining amount detecting device (AE-10A Kit Part No.
Page 5: Specifications
Top and bottom feed Timing belt actuation mechanism Lubrication Automatic lubrication (partially by manual) Lubricating oil JUKI New Defrix Oil No. 2 (equivalent to ISO standard VG32) Bed size 517 mm x 178 mm Space under the arm 255mm x99mm Hand wheel size V belt effective diameter : ø93.3 mm Outer diameter : ø160 mm...
Page 6 Cam-driven scissors type method Lubrication Automatic lubrication (partially by manual) Lubricating oil JUKI New Defrix Oil No. 2 (equivalent to ISO standard VG32) Bed size 517 mm x 178 mm Space under the arm 255 mm x 99 mm Hand wheel size V belt effective diameter : ø93.3 mm Outer diameter : ø160 mm...
Page 7 Cam-driven scissors type method Lubrication Automatic lubrication (partially by manual) Lubricating oil JUKI New Defrix Oil No. 2 (equivalent to ISO standard VG32) Bed size 517 mm x 178 mm Space under the arm 255 mm x 99 mm Hand wheel size V belt effective diameter : ø93.3 mm Outer diameter : ø160 mm...
Page 8 Timing belt actuation mechanism Lubrication By manual (Centralized tank lubrication system) Lubricating oil JUKI New Defrix Oil No. 2 (equivalent to ISO standard VG32) Bed size 517 mm x 178 mm Space under the arm 255 mm x 99 mm V belt effective diameter : ø93.3 mm...
Page 9 Cam-driven scissors type method Lubrication Automatic lubrication (partially by manual) Lubricating oil JUKI New Defrix Oil No. 2 (equivalent to ISO standard VG32) Bed size 517 mm x 178 mm Space under the arm 255 mm x 99 mm Hand wheel size V belt effective diameter : ø93.3 mm Outer diameter : ø160 mm...
Page 10 Thread trimming — method Lubrication By manual Lubricating oil JUKI New Defrix Oil No. 2 (equivalent to ISO standard VG32) Bed size 517 mm x 178 mm Space under the arm 255 mm x 99 mm Hand wheel size V belt effective diameter : ø93.3 mm Outer diameter : ø160 mm...
Page 11 MEMO – 7 –...
Page 12: Standard Adjustment
(1) Needle entry position Standard Adjustment Model Dimension A LU-1561N-7 11.5±0.1mm LU-1511N-7 11±0.1mm LU-1509N LU-1561N 10 ±0.1mm Top surface of LU-1509NH throat plate LU-1510N-7 9±0.1mm LU-1560N-7 LU-1560N Standard gauge type LU-1508N 8.5±0.1mm LU-1510N LU-1510NA-7 LU-1508NH 8±0.1mm LU-1565N Top surface of Conditions throat plate •...
Page 13 Adjustment Procedures Results of Improper Adjustment o Stitch skipping or needle breakage 1. Set the stitch dial to “0”. will result. 2. Turn the handwheel to bring the needle bar to the lowest dead point o Poorly tensed stitches will result. of its stroke.
Page 14: Lateral Position Of The Feed Dog
Adjust so that A = B and C = D are almost obtained. (4) Height of the feed dog Standard Adjustment Model Dimension A LU-1509N 0.4 to 0.5mm LU-1509NH LU-1510N-7 LU-1511N-7 LU-1560N-7 LU-1561N LU-1561N-7 LU-1510NA-7 0.7 to 0.9mm LU-1508N 0.8 to 0.9mm...
Page 15 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “0”. o Stitch skipping or thread breakage 2. Turn the handwheel to bring the needle bar to the lowest dead point will result. of its stroke. o Poorly tensed stitches will result. 3.
Page 16: Height Of The Hook
(5) Height of the hook Standard Adjustment Hook stopper section (6) Adjusting the inner hook guide Standard Adjustment Model Dimension A LU-1510N-7 0.1 to 0.2mm LU-1511N-7 LU-1560N-7 LU-1561N-7 LU-1508N 0.1 to 0.3mm LU-1509N LU-1508NH LU-1509NH LU-1510N LU1560N LU-1561N To come in close contact...
Page 17 Adjustment Procedures Results of Improper Adjustment 1. Loosen two setscrews in the screw gear (small). o Stitch skipping or thread breakage 2. Draw out hook in the direction of the arrow. (At this time, bring will result. No. 1 screw of setscrews to the front of the operator.) o Needle breakage will result.
Page 18: Needle-To-Hook Timing
(7) Needle-to-hook timing Standard Adjustment Model Dimension A LU-1510N-7 58.7mm LU-1510NA-7 LU-1511N-7 57.7mm LU-1508N 56.7mm LU-1510N LU-1509N 55.7mm LU-1561N-7 55.9mm LU-1560N-7 56mm LU-1561N 53.9mm LU-1560N 54mm LU-1508NH 52.3mm LU-1509NH 51.3mm Screw gear (large) Model Dimension B Dimension C Dimension D LU-1510N-7 2.3±0.2mm...
Page 19 5. Adjust the distance from the lower end of needle bar frame to the lower end of the needle bar to dimension A. Then tighten clamping screw in the needle bar holder. (For LU-1510N-7, there is an engraved marker line in needle bar 2) Needle-to-blade point of hook timing 1.
Page 20: Lift Of The Presser Foot
(8) Lift of the presser foot 1) Hand lifter Standard Adjustment Top surface of throat plate Condition • State that the hand lifter is raised 2) Knee lifter (Without thread trimmer only) Standard Adjustment knee lifter lever B knee lifter lever A Top surface of Conditions : Lifting amount when stopper throat plate...
Page 21 Adjustment Procedures Results of Improper Adjustment 1) Hand lifter When the lifting amount is higher than 1. Loosen setscrew in the side cover located at the antioperator’s the specified value : side of the machine arm and remove side cover o The presser foot is held raised from (Machine without thread trimmer only) the top surface of the throat plate...
Page 22: Automatic Presser Foot Lifter (Machine With Thread Trimmer Only)
3) Automatic presser foot lifter (Machine with thread trimmer only) Standard Adjustment Top surface of throat plate (9) Timing between the upper shaft and the lower shaft Standard Adjustment To be parallel Conditions • Feed amount : 0 mm • Needle bar at lowest dead point –...
Page 23 Adjustment Procedures Results of Improper Adjustment When the lifting amount is higher than 3) Automatic presser foot lifter (Machine with thread trimmer only) 1. Loosen cylinder nut and adjust the screwing amount of cylinder the specified value : connecting screw so that the height from the top surface of the o The top end of the needle bar in- terferes with the walking foot and...
Page 24: Feed Cam Timing
(10) Feed cam timing 1) Horizontal feed cam timing Standard Adjustment o In case of LU type machines other than LU-1508NH and LU-1509NH Main shaft Conditions Screw No. 1 • Feed amount : maximum • Needle bat at lowest dead point o In case of LU-1508NH and LU-1509NH Screw No.
Page 25 Adjustment Procedures Results of Improper Adjustment 1) Horizontal feed cam timing o Pitch error at high or low speed is o In case of LU type machines other than LU-1508NH and LU- apt to occur. 1509NH o Needle thread tension will vary. 1.
Page 26: Top Feed Cam Timing
2) Top feed cam timing Standard Adjustment o In case of the machine without thread trimmer Main shaft Screw No. 1 Screw No. 2 To align Conditions • Feed amount : 6 mm • When needle and walking foot are lowered. o In case of the machine with thread trimmer Conditions •...
Page 27 Adjustment Procedures Results of Improper Adjustment 2) Top feed cam timing o Pitch error at high or low speed is o In case of the machine without thread trimmer apt to occur. 1. Set the stitch dial to “6”. 2. Adjust the amount of alternate vertical movement of both the walk- ing foot and the presser foot to the standard (the lower engraved marker line on the top feed rear arm aligns with the center of the hinge screw).
Page 28: Feed Motion
(11) Feed motion 1) Amount of alternate vertical movement (position of the vertical adjusting arm) Standard Adjustment o In case of the machine without thread trimmer Standard of amount of alternate vertical movement Upper engraved marker line : Approx. 5 mm Center engraved marker line : Approx.
Page 29 Adjustment Procedures Results of Improper Adjustment 1) Amount of alternate vertical movement Increase the height of working in o In case of the machine without thread trimmer accordance with the sewing products. 1. Loosen the window plate setscrew and remove the window plate. o Sewing sponge material or the like 2.
Page 30: Alternate Momentum
2) Alternate momentum Standard Adjustment Top surface Conditions of feed dog • Feed amount : 0 mm Top surface of Top surface of • Amount of alternate vertical movement : standard throat plate throat plate o In case of the machine without thread trimmer o In case of the machine with thread trimmer (12) Needle sway (Adjusting the bottom feed amount) Standard Adjustment...
Page 31 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 2. Turn the handwheel to make sure that the amount of alternate vertical that of the presser foot in accordance movement of walking foot and presser foot...
Page 32: Stitch Length Of Forward/Reverse Feed
(13) Stitch length of forward/reverse feed Standard Adjustment Conditions • Feed amount : 6 mm Feed adjusting base Notched part Notch Feed adjusting rod (14) Balancer (Machine without thread trimmer only) Standard Adjustment To be equal Screws No. 1 align with each other.
Page 33 Adjustment Procedures Results of Improper Adjustment o Respective stitch lengths of normal 1. Set the stitch dial to “6”. and reverse feeds do not match. 2. Loosen two setscrews in the feed adjusting eccentric pin. 3. Turn feed adjusting eccentric pin to adjust the stitch o length.
Page 34: Vertical Position Of The Needle Bar Rocking Frame
(15) Vertical position of the needle bar rocking frame Standard Adjustment Needle bar lid screw Pushing direction Rocking Needle stop frame push rod Half ring Needle bar fixing shaft Highest dead point of Needle bar rocking frame shaft needle bar connection Needle stop ball slide shaft Needle stop...
Page 35 Adjustment Procedures Results of Improper Adjustment 1. Loosen two setscrews in the needle bar rocking frame shaft o Trouble of the organized split attached to needle bar rocking frame needle bar occurs. 2. Pushing the needle bar rocking frame base shaft in the direction of the arrow mark, turn the needle bar rocking frame to the left or right, and the needle bar rocking frame moves up or down.
Page 36: Dimension Of The Needle Stop Adjusting Slide Shaft (Asm.)
(16) Dimension of the needle stop adjusting slide shaft (asm.) Standard Adjustment (17) Position of the change lever Standard Adjustment Needle stop change base 49.7 mm Thread tension base plate Change lever Change fixing lever Needle bar rocking shaft base –...
Page 37 Adjustment Procedures Results of Improper Adjustment 1. Loosen needle stop adjusting screw and nut , turn needle stop o When the dimension is improper, adjusting screw to adjust the dimension to 30.9±0.1 mm and fix it various places related to the needle with needle stop adjusting nut bar rocking frame will be affected and trouble of needle stop will be...
Page 38: Position Of The Reverse Feed Control Lever
(18) Position of the reverse feed control lever Standard Adjustment o In case of LU-1510N-7, LU-1511N-7, o In case of LU-1508N, LU-1509N, LU-1560N-7, LU-1561N-7, LU-1508NH LU-1510N, LU-1560N, LU-1561N and LU-1509NH and LU-1565N A=1±0.5mm Almost level o In case of LU-1510NA-7 A=7±0.5mm...
Page 39 Adjustment Procedures Results of Improper Adjustment o In case of LU-1510N-7, LU-1511N-7, LU1560N-7, LU-1561N-7, LU- When the position of the reverse feed 1508NH and LU-1509NH control lever is low 1. Set the stitch dial to the maximum. o Reverse feed control lever inter- 2.
Page 40: Reverse Feed Cylinder
(20) Reverse feed cylinder Standard Adjustment 7 to 8 mm Feed adjusting rod Hinge screw (21) Lubrication 1) In case of manual lubrication Standard Adjustment Oil surface Decrease 1 mm Increase Drawing of top surface of machine arm A sheet of paper –...
Page 41 Adjustment Procedures Results of Improper Adjustment 1. Loosen nut o When the fork section does not 2. Turn the shaft of cylinder and adjust so that the distance from enter the hinge screw, stitches of the end of shaft of cylinder to cylinder connecting screw should the reverse feed may not be...
Page 42: In Case Of Automatic Lubrication
2) In case of automatic lubrication Standard Adjustment Increase Decrease A sheet of paper Drawing of top surface of machine arm – 38 –...
Page 43 , and fix them with butterfly nut 7. Insert the oil pipe into the oil tank and fix it with a clip. Fill the oil tank with JUKI New Defrix Oil No. 2 up to HIGH level. – 39 –...
Page 44: Thread Trimmer Device
Conditions : Make the edge of counter knife come in contact with the step difference of counter knife base. Left Right Dimension Model Dimension A Dimension B Dimension A Dimension B LU-1510N-7 – – LU-1511N-7 – – 23.2±0.1mm 3.5±0.1mm LU-1510NA-7 –...
Page 45 List occurs. Position of left clamp spring Position of right clamp spring LU-1510N-7 Thickness of part A is 3.5 LU-1511N-7 mm. Insert this part between LU-1510NA-7...
Page 46: Position Of The Counter Knife Base
To contact To contact To contact 1.5mm Dimension C Dimension DimensionC Dimension D Model LU-1510N-7 Condition : Make the edge of counter knife base – LU-1511N-7 come in contact with the step difference 1.5±0.2mm LU-1510NA-7 of hook shaft base. LU-1560N-7 2±0.2mm...
Page 47 Results of Improper Adjustment Adjustment Procedures When dimension C or D is larger 2) Position of the counter knife base o Knife pressure is increased and 1. Loosen setscrews in the counter knife base. motor stop will be caused. 2. Use counter knife gauge supplied as accessories and move o Setting/taking out bobbin cannot be counter knife base...
Page 48: Adjusting The Knife Pressure
Conditions : Moving knife and counter knife come in contact with each other. : Rocking arm and stopper plate come in close contact with each other. o Initial position Model Dimension A LU-1510N-7 Close contact LU-1510NA-7 2±0.2mm LU-1560N-7 LU-1511N-7 0.5±0.2mm...
Page 49 Adjustment Procedures Results of Improper Adjustment 4) Adjusting the knife pressure When the knife pressure is high 1. Loosen setscrews in the moving knife. o Blade sections of the counter knife 2. Adjust the installing position of the moving knife so that the position and the moving knife may be dam- where moving knife and counter Knife...
Page 50: Thread Trimmer Cam Timing
6) Thread trimmer cam timing Standard Adjustment Engraved marker dot Red engraved on machine arm marker dot Hook driving shaft Section R Close contact Close contact Handwheel Conditions : Engraved marker dot on the handwheel aligns with engraved marker dot on ma- chine arm.
Page 51 Adjustment Procedures Results of Improper Adjustment 6) Thread trimmer cam timing When thread trimming timing is 1. Loosen setscrews in the thread trimmer cam which have been retarded temporarily tightened at “5) Thread trimmer cam”. o Thread trimming action does not 2.
Page 52: Connecting The Left And Right Rocking Arms (2-Needle Machine Only)
8) Connecting the left and right rocking arms (2-needle machine only) Standard Adjustment Condition : When the moving knife is positioned to the initial position. (Refer to “o Initial position of 4) Adjusting the knife pressure”) Close contact Close contact Thread trimmer shaft Moving knife shaft connecting plate...
Page 53 Adjustment Procedures Results of Improper Adjustment o When the respective positions are 8) Connecting the left and right rocking arms not correct, defective thread (2-needle machine only) trimming occurs. 1. Loosen setscrews in the moving knife shaft connecting plate. 2. Make rocking arm (right) come in close contact with thread trim- mer stopper 3.
Page 54: Alternate Vertical Dial
(23) Alternate vertical dial 1) Installing position of the detection switch of the amount of alternate vertical movement Standard Adjustment Sewing speed of LU-1510N-7 and LU-1511N-7 Amount of alternate vertical Stitch length : Stitch length : movement of the walking foot...
Page 55 Adjustment Procedures Results of Improper Adjustment 1. Turn the alternate vertical dial to adjust the scale “1” to the convex o Sewing speed may not change section on the top cover. even when turning the alternate 2. Loosen setscrew in the alternate vertical dial and remove the vertical dial.
Page 56: Installation Of The Optional Parts
Part No. of DL22 Kit C for installation after mechanical setup: 40025683 * Please order from us with the aforementioned part No. (Applicable models: LU-1510N-7, LU-1511N-7, LU-1560N- 7, LU-1561N-7) Remove window plate C and window plate packing C lo- cated on the anti-operator’s side of the machine arm.
Page 57: Thread Trimmer Ver.up Set (Part No. For 1-Needle : 21389259, Part No. For 2-Needle : 21389267)
Parts list • Removing parts list Note Part No. Name of part Q’ty • Set Part No. of DL device (This part No. is the set part 21339601 Top feed stopper plate A No. of the parts List A to List C.) 21339700 Top feed stopper plate Note...
Page 58: Automatic Reverse Feed Device
(4) Automatic reverse feed device 1) Removing the window plate (Removing parts list) 2) Removing the reverse feed control lever (Removing parts list) Hand Window plate A wheel Stitch dial 1. Loosen setscrew in the window plate B located 1. Loosen the respective setscrews in the belt cover and at anti-operator’s side of the machine arm.
Page 59: 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 with setscrew 2. Install reverse feed control lever stopper to the machine arm with setscrew (In case of LU-1508NH and LU-1509NH, add washer to reverse feed control lever stopper and install the lever with setscrew...
Page 60: Installing The Automatic Reverse Feed Device (List 3)
5) Installing the automatic reverse feed device (List 3) 1. Install reverse feed link to reverse feed link installing base with reverse feed link hinge screw 2. Install straight joint to the inlet port of reverse feed cylinder and install muffler to the exhaust port.
Page 61: Installing The Touch-Back Switch (List 4)
6) Installing the touch-back switch (List 4) 1. Install touch-back switch with washer and setscrew Installing parts list of touch-back switch (List 4) Note Part No. Name of part Q’ty 21348859 Touch-back switch SS7110840SP Setscrew WP0501016SD Washer 7) Installing the pneumatic components (List 5) 1.
Page 62: Automatic Presser Foot Lifter
(5) Automatic presser foot lifter 1) Installing the automatic presser foot lifter (List A) Remove the side plate located on the anti-operatorís side of the machine arm. (List of the parts to be removed) Install two elbows to automatic presser foot lifter cylinder Install cylinder connecting screw to automatic presser foot lifter cylinder For the standard, adjust the distance from the end face of piston rod of automatic presser foot lifter cylinder 1 to the end face...
Page 63: Installing The Pneumatic Device Components
In case of installing the automatic reverse feed device and the automatic presser foot lifter after set-up of machine Pneumatic device components (List B) o Pneumatic device used : AK-134A and AK-134B • Install the device above in the form of adding to the pneumatic components of the automatic re- verse feed device.
Page 64: Parts List
3) Parts List Removing parts list Note Part No. Name of part Q’ty 21332309 Side plate cover SS4110815SP Side plate cover setscrew Removing parts list Set part No. of automatic presser foot lifter (Caution : These set part Nos. are the set part Nos. of the parts from List A to List D.) Set No.
Page 65: Portion To Which Locktite Is Applied
4. PORTION TO WHICH LOCKTITE IS APPLIED LOCKTITE has been applied to the following parts at the time of assembly at the factory. Avoid disassembling these parts to the most. When an assembly which includes the aforementioned parts has been forced to be disassembled, be sure to wash the LOCKTITE applied part using a paint thinner or the like, and reassemble it using LOCKTITE after removing any moisture from the mating faces.
Page 66: Selective Parts And Consumable Parts
135x17 Nm 160 135x17 Nm 160 Hook (asm.) B18305630A0 Hook (asm.) B1830563BA0 For extra thick thread Bobbin B9117563000 Bobbin B9117563000 o For LU-1510N-7, LU-1510NA-7 and LU-1511N-7 Consumable part Part No. Remarks Model Needle MC372001600 SCHMETZ 135x17 Nm 160 LU-1510N-7, LU-1511N-7 Needle MC372001200...
Page 67: Engraved Marker Dots On The Handwheel (For The Machine With Thread Trimmer Only)
(colorless) Range of needle-up stop position (white) Adjustment of thread Needle-down stop trimmer cam (red) position (yellow) 7. LUBRICATION ROUTE DIAGRAM LU-1510N, LU-1560N, LU-1561N LU-1510NA-7 LU-1510N-7, LU-1511N-7 LU-1508N, LU-1509N LU-1560N-7, LU-1561N-7 LU-1508NH, LU-1509NH – 63 –...
Page 68: Machine Head Wiring (For The Machine With Thread Trimmer Only)
8. MACHINE HEAD WIRING (FOR THE MACHINE WITH THREAD TRIMMER ONLY) (1) Connectors coming from machine head o 12-pin connector o 16-pin connector Name of part Pin No. Remarks Name of part Pin No. Remarks Thread trimmer solenoid - - - - - - - - 5-operation switch BT SW Thread release solenoid...
Page 69: Connectors Coming From Pneumatic Device
BT (–) BT (–) Solenoid valve 2 AK (+) AK (+) Solenoid valve 2 AK (–) AK (–) LU-1510N-7, 11N-7 Applicable models LU-1510NA-7 LU-1560N-7, 61N-7 o DL device provided (10P connector) Pneumatic device C (asm.) Name of part Pin No.
Page 70: Connectors Coming From The Relay Cable (Connecting Side To The Control Box)
(3) Connectors coming from the relay cable (Connecting side to the control box) o CN50-1 to 4 connector Functions Pin No. CN50-1 CN50-2 CN50-3 CN50-4 +24V +24V +24V +24V AK (–) DL (–) Condense (–) Sewing machine run signal BT (–) 2P (–) Remaining shorter (–) —...
Page 71: Table Of Troubles And Corrective Measures
9. TABLE OF TROUBLES AND CORRECTIVE MEASURES (1) With regard to sewing Troubles Causes Checking Corrective measures Thread breakage Thread path, needle point, Check the sharp Remove the sharp edges or burrs hook blade point or inner edge or burr on the on the blade point of hook using hook resting groove on respective parts.
Page 72 Troubles Causes Checking Corrective measures Stitch skipping Clearance between the Check the clearance. Refer to “(7) Needle-to-hook needle and the blade timing”. point of hook is too large. Needle-to-hook timing is Check the specified Refer to “(7) Needle-to-hook excessively advanced or dimension.
Page 73 Troubles Causes Checking Corrective measures Loose stitches Clearance between the Check the clearance. Refer to “(6) Adjusting the inner (Balloon stitches or inner hook guide and the hook guide”. isolated 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...
Page 74 Troubles Causes Checking Corrective measures Irregular stitches Stroke of the thread take-up Check the stroke of Adjust the thread take-up spring to spring is improper. the thread take-up move to approximately 1 mm from spring. the initial position when hook draws thread maximumly.
Page 75: With Regard To Thread Trimming
(2) With regard to thread trimming Troubles Causes Checking Corrective measures One or several stitches Thread remaining at the Check the routing of Thread the needle thread correctly. skip at the start of sewing. needle top after thread needle thread. Adjust so that abnormal needle trimming is short.
Page 76 Troubles Causes Checking Corrective measures Thread slips off the Needle thread slips off the Check whether the Refer to the Cause “Needle needle eyelet. needle eyelet immediately needle thread remaining thread remaining at the needle after thread trimming. at the needle top after top after thread trimming is short”...
Page 77 Troubles Causes Checking Corrective measures From the previous page From the previous page Tension of the bobbin Adjust the tension of bobbin thread is too high. thread. Knife pressure of the Refer to “(22)-4) Adjusting the counter knife is too high. knife pressure”.
Page 78 Troubles Causes Checking Corrective measures From the previous page Both needle and bobbin The blades of moving Refer to “(22)-4) Adjusting the thread cannot be trimmed. knife and counter knife knife pressure”. have been improperly adjusted. Counter knife pressure Refer to “(22)-4) Adjusting the is excessively low.
Page 79: Drawing Of The Table
Style of tpe : Helvetica Reg. Condensed Thickness : 1.5 Condensed voided letters (on the reverse side) Thickness : 0.5 3 JUKI logotype Thickness : 1.5 Thickness : 0.8 4 16 depth 30 5 Top surface C1.5 6 18 drill 7 3-ø13 drilled hole...
Page 80 MEMO...
Page 81 Please do not hesitate to contact our distributors or agents in your area for further information when necessary. * The description covered in this engineer's manual is subject to change for improvement of the Copyright © 2006 JUKI CORPORATION. commodity without notice.

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