Table of Contents
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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
Needle thread roll-in
mechanism
20
Automatic presser foot
lifter mechanism
21
Lubrication
22
Lubricating oil
23
Cylinder bed diameter
24
Free space for sewing
25
Size of handwheel
26
Motor
1-needle, unison feed, lockstitch machine with automatic thread trimmer
(Needle thread roll-in and shorter-thread remaining type)
For heavy-weight materials
SCHMETZ 135 X 17 Nm 125 to 180 Standard : Nm 160
Max. 9 mm (normal/reverse feed)
Hand lifter : 9 mm
Air cylinder type (with touch-back switch)
1 mm to 6.5 mm Alternate foot stroke adjusted by dial
Full-rotary vertical-axis 2-fold hook (Latch type)
Air cylinder + cam-driven scissors type
Threading by air cylinder + thread presser type
Automatic lubrication (partially by manual)
JUKI New Defrix Oil No. 2
V belt effective diameter : ø93.3 mm
– 1 –
Specifications
LU-1520N-7
Max. 3,000 rpm
#30 to #5
#30 to #5
Knee lifter : 16 mm
By dial
Slide thread take-up
36 mm
Ellipse feed
Timing belt
Air cylinder type
517 mm x 178 mm
255 mm x 99 mm
Outer diameter : ø160 mm
SC-380
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Table of Contents
Related Manuals for JUKI LU-1520N-7
Summary of Contents for JUKI LU-1520N-7
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Page 1: Specifications
Automatic presser foot Air cylinder type lifter mechanism Lubrication Automatic lubrication (partially by manual) Lubricating oil JUKI New Defrix Oil No. 2 Cylinder bed diameter 517 mm x 178 mm Free space for sewing 255 mm x 99 mm Size of handwheel V belt effective diameter : ø93.3 mm... -
Page 2: Standard Adjustment
2. STANDARD ADJUSTMENT (1) Needle entry position Standard Adjustment Top surface of throat plate Model DimennsionA LU-1520N-7 9±0.1mm Conditions • Needle bar at lowest dead point • Feed amount : 0 mm (2) Longitudinal position of the feed dog Standard Adjustment a=a’... - Page 3 Adjustment Procedures Results of Improper Adjustment ™ Stitch skipping or needle 1. Set the stitch dial to “0”. 2. Turn the handwheel to bring the needle bar to the lowest dead breakage will result. ™ Poorly tensed stitches will result. point of its stroke.
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Page 4: Lateral Position Of The Feed Dog
Adjust the position to almost A = B. (4) Height of the feed dog Standard Adjustment Model Dimension A LU-1520N-7 0.4 to 0.5 mm Conditions • Feed amount : 0 mm • Height of feed dog is maximum. – 4 –... - Page 5 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “0”. ™ S t i t c h s k i p p i n g o r t h r e a d 2. Turn the handwheel to bring the needle bar to the lowest dead breakage will result.
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Page 6: Height Of The Hook
(5) Height of the hook Standard Adjustment Hook stopper section (6) Adjusting the inner hook guide Standard Adjustment To come in close contact with each other Conditions : When the inner hook guide travels to its back end. : Press the inner hook stopper to the groove in the throat plate. –... - Page 7 Adjustment Procedures Results of Improper Adjustment 1. Loosen two setscrews 1 in the screw gear (small). ™ S t i t c h s k i p p i n g o r t h r e a d 2. Draw out hook 2 in the direction of the arrow. (At this time, breakage will result.
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Page 8: Needle-To-Hook Timing
(7) Needle-to-hook timing Standard Adjustment Model Dimension A LU-1520N-7 58.7 mm Standard : Engraved marker line on the upper side of needle bar 0.1 to 0.2 mm Conditions : Feed amount : 0 mm : Needle bar rises from the lowest dead point of its stroke. - Page 9 Adjustment Procedures Results of Improper Adjustment 1) Standard of the lowest dead point of the needle bar ™ S t i t c h s k i p p i n g o r t h r e a d 1.
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Page 10: Lift Of The Presser Foot
(8) Lift of the presser foot Standard Adjustment 1) Hand lifter Top surface of throat plate Condition • State that the hand lifter is raised 2) Automatic presser foot lifter Top surface of throat plate – 10 –... - Page 11 Adjustment Procedures Results of Improper Adjustment 1) Hand lifter When the lifting amount is higher 1. Loosen clamping screw 1 in the presser bar bracket to set the than the specified value : hand lifter 2 to the raised state. ™...
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Page 12: Timing Between The Upper Shaft And The Lower Shaft
(9) Timing between the upper shaft and the lower shaft Standard Adjustment To be level Conditions • Feed amount : 0 mm • Needle bar at lowest dead point (10) Feed cam timing Standard Adjustment 1) Horizontal feed cam timing Main shaft Screw No. - Page 13 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “0”. ™ Stitches wil be poorly tensed. 2. Remove timing belt 3. ™ Feed timing and needle to hook 3. Turn the handwheel to bring the needle bar to the lowest dead timing will vary.
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Page 14: Top Feed Cam Timing
Standard Adjustment 2) Top feed cam timing Conditions • Feed amount : 6 mm • When needle and walking foot are lowered. Main shaft Top feed cam rod To align ™When DL device is not provided ™When DL device is provided Top feed cam rod Screw No.1 Top feed cam rod... - Page 15 Adjustment Procedures Results of Improper Adjustment 2) Top feed cam timing ™ Pitch error at high or low speed 1. Set the stitch dial to “6”. will be deteriorated. 2. Set the alternate vertical dial to "3". 3. Remove the window plate setscrew and remove the window plate and the window plate packing.
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Page 16: Feed Motion
(11) Feed motion Standard Adjustment 1) Amount of alternate vertical movement (position of the vertical adjusting arm) 73 to 74 mm Operator’s side Edge of machine arm 73 to 74 mm To align with edge 2) Alternate momentum Top surface of feed dog Top surface of Top surface of... - Page 17 Adjustment Procedures Results of Improper Adjustment 1) Amount of alternate vertical movement Increase the vertical stroke of the 1. Remove the top cover. walking foot in accordance with the 2. Loosen setscrew 4 in the vertical adjusting arm. sewing products. 3.
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Page 18: Needle Sway (Adjusting The Bottom Feed Amount)
(12) Needle sway (Adjusting the bottom feed amount) Standard Adjustment Horizontal feed shaft 20±0.5 mm Engraved marker line (13) Stitch length of normal/reverse feed Standard Adjustment Conditions • Feed amount : 6 mm Feed adjusting base Notch Feed adjusting rod –... - Page 19 Adjustment Procedures Results of Improper Adjustment 1. Loosen hinge screw nut 1 in the horizontal feed rear arm. ™ Needle breakage or stitch 2. Move horizontal feed connecting rod 2 so that the distance skipping will result. from the center of the horizontal feed shaft to that of the hinge screw is 20 ±...
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Page 20: Position Of The Reverse Feed Control Lever
(14) Position of the reverse feed control lever Standard Adjustment Feed Reverse feed lever shaft regulator (15) Safety clutch Standard Adjustment * Standard of release pressure 5.9N•m 24.5N•m 9.8N•m – 20 –... - Page 21 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial 4 to the maximum. When the position of the reverse 2. Loosen hexagon headed bolt 3 in the feed regulator to adjust feed control lever is low so that a clearance of 1 ± 0.5 mm is provided between reverse ™...
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Page 22: Reverse Feed Cylinder And Condensation Cylinder
(16) Reverse feed cylinder and condensation cylinder Standard Adjustment 7 to 8 mm Feed adjusting rod Hinge screw Standard : 8 to 8.5 mm – 22 –... - Page 23 Adjustment Procedures Results of Improper Adjustment ™ Reverse feed cylinder 1. Loosen nut 1. 2. Turn the shaft of cylinder 5 and adjust so that the distance from the end of shaft of cylinder 5 to cylinder connecting screw 2 should be 7 to 8 mm. 3.
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Page 24: Lubrication
(17) Lubrication Standard Adjustment Increase Decrease A sheet of paper – 24 –... - Page 25 ™ Hook is heated resulting in a clip. seizure. 3. Pour the JUKI New Defrix Oil No. 2 into the oil tank 1 until When the amount of oil is too much HIGH level is reached. ™ Thread is stained with oil. In 4.
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Page 26: Thread Trimmer Device
(18) Thread trimmer device Standard Adjustment 1) Lateral position of the thread trimmer base Condition : Thread trimmer base aligns with end of machine bed 20.0 to 20.5 mm Left end of throat plate To align both ends – 26 –... - Page 27 Adjustment Procedures Results of Improper Adjustment 1. Loosen setscrew 1 in the thread trimmer base. When the distance from the moving 2. Move thread trimmer base 2 so that the distance from moving knife drive shaft to the left end of knife drive shaft 3 to the left end of the throat plate is 20 to the throat plate is larger than the 20.5 mm.
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Page 28: Height Of The Moving Knife
Standard Adjustment 2) Height of the moving knife Throat plate Bottom surface of throat plate 3) Knife pressure – 28 –... - Page 29 Adjustment Procedures Results of Improper Adjustment 1. Remove the air hose connecting to the regulator and cut off When the distance from the moving the air. knife to the installing plane of the 2. Loosen setscrews 1 in the clamp spring base so that the clamp throat plate is larger than the pressure is not applied to moving knife 3.
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Page 30: Initial Position Of The Moving Knife And The Waiting Knife
Standard Adjustment 4) Initial position of the moving knife and the waiting knife Moving knife drive shaft To come in close Waiting knife contact with each other drive shaft 0.1 to 0.2 mm Conditions : Moving knife : Moving knife drive arm 2 should come in close contact with drive arm stopper : Waiting knife : Clearance provided between waiting knife drive arm B 6 and drive arm stopper 3 is 0.1 to 0.2 mm. - Page 31 Adjustment Procedures Results of Improper Adjustment ™ Moving knife When the diatance from the top end 1. Loosen setscrew 1. of moving knife to the end of 2. In the state that moving knife drive arm 2 comes in close machine bed is larger than the contact with drive arm stopper 3, move moving knife 4 so specified value :...
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Page 32: Most Advanced Position Of The Moving Knife
Standard Adjustment 5) Most advanced position of the moving knife Condition : Screw should come in close contact with moving knife drive arm. To come in close contact with each other Hook driving shaft front bushing Standard : Approx. 0.5 mm To come in close contact with each other End of machine bed... - Page 33 Adjustment Procedures Results of Improper Adjustment 1. Loosen nut 1. When the distance from the top end 2. Set the stitch dial to "0". of moving knife to the end of machine bed is larger than the 3. Remove the air hose connecting to the regulator and cut off specified value : the air.
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Page 34: Most Advanced Position Of The Waiting Knife And The Cam Timing
Standard Adjustment 6) Most advanced position of the waiting knife and the cam timing Hook driving shaft front bushing Standard : Approx. 0.5 mm To come in close contact with each other Condition : Thread trimmer cam should come in close contact with end of cam roller. - Page 35 Adjustment Procedures Results of Improper Adjustment ™ Initial position of the waiting knife When the distance from the top end 1. Loosen two setscrews 1. of waiting knife to the end of machine bed is larger than the 2. Set the stitch dial to “0”. specified value : 3.
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Page 36: Position Of The Clamp Spring
Standard Adjustment 7) Position of the clamp spring To come in close contact with each other Thread trimmer base To come in close contact with each other – 36 –... - Page 37 Adjustment Procedures Results of Improper Adjustment ™ Longitudinal direction When the clamp spring is located 1. Loosen setscrews 1 and remove clamp spring base 2. in the front : 2. Loosen setscrews 4 and adjust so that the distance from the ™...
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Page 38: Needle Thread Roll-In At Start Of Sewing Device
(19) Needle thread roll-in at start of sewing device Standard Adjustment 1) Threading device 1±0.5 mm 2) Thrread presser device Tetoron thread #8 Standard : 5.5 to 6.5 mm (When cylinder shaft is shrunk) A (2.94N or more) – 38 –... - Page 39 Adjustment Procedures Results of Improper Adjustment ™ Lateral position When the clearance provided 1. Loosen setscrews 1. between the threading plate and the 2. Move cylinder base 3 so that the clearance provided between end of machine arm is larger than threading plate 2 and the end of the groove of machine arm is the specified value : ™...
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Page 40: Alternate Vertical Dial
(20) Alternate vertical dial Standard Adjustment 1) Installing position of the detection switch of the amount of alternate vertical movement Alternate vertical dial Amount of alternate vertical Stitch length : Stitch length : movement of the walking foot and More than 6 mm 6 mm or less presser foot and 9 mm or less... - Page 41 Adjustment Procedures Results of Improper Adjustment 1. Turn the alternate vertical dial to adjust the scale “1” to the ™ Sewing speed may not change convex section on the top cover. even when turning the alternate 2. Loosen setscrew 1 in the alternate vertical dial and remove vertical dial.
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Page 42: Installation Of The Optional Parts
3. INSTALLATION OF THE OPTIONAL PARTS (1) DL device (DL21 Kit F for installation after set-up of machine : GDL21000FA0) * Please order from us with the aforementioned part No. 1. Remove the window plate E located on the anti-operator’s side of the machine arm. 2. -
Page 43: 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 44: Selective Parts And Consumable Parts
5. SELECTIVE PARTS AND CONSUMABLE PARTS Name of selective part Part No. Marking Remarks Hook shaft upper bushing thrust washer 10109700 t=1.0 mm Ditto 10110906 t=1.1 mm Ditto 10111003 t=1.2 mm Ditto 10111102 t=1.3 mm (standard) Ditto 10111201 t=1.4 mm Ditto 10109809 t=1.5 mm... -
Page 45: Engraved Marker Dots On The Handwheel
6. ENGRAVED MARKER DOTS ON THE HANDWHEEL Needle-up stop position at the time of reverse revolution to lift needle Range of needle-up stop position (white) Adjustment of thread trimmer cam (red) Needle-down stop position (yellow) 7. LUBRICATION ROUTE DIAGRAM –45 –... -
Page 46: Pneumatic Components Piping
8. PNEUMATIC COMPONENTS PIPING Air cylinder name Indication No. Remarks Condensation Automatic reverse feed Thread trimmer Cylinder pull-in side Thread trimmer Cylinder push-out side Threading, thread presser Cylinder push-out side Threading Cylinder pull-in side Presser lift Cylinder pull-in side Presser lift Cylinder push-out side For DL device only Knife fixing... -
Page 47: Machine Head Wiring
9. MACHINE HEAD WIRING (1) Connectors coming from machine head ™6-pin connector ™12-pin connector Name of part Pin No. Remarks Name of part Pin No. Remarks Tension release solenoid Synchronizer SGND (Black) Tension release solenoid – Synchronizer UDET (White) DL control switch SW1 (White) Synchronizer DDET (Green) -
Page 48: Connectors Coming From The Pneumatic Device
(2) Connectors coming from the pneumatic device ™9-pin connector Mame of part Pin No. Remarks Solenoid valve 1 BT (–) (White) Solenoid valve 1 BT (+) (Red) Solenoid valve 1 Condensation (–) (Black) Solenoid valve 4 AK (+) (Red) Solenoid valve 4 AK (–) (Black) Solenoid valve 5 DL (+) (Red) : For DL type only... - Page 49 ™15-pin connectot Pin No. Relay cable A (asm.) Relay cable B (asm.) GND (Black) GND (Black) DL switch 1 (Red) DL switch 1 (Red) ------- DL LED (–), DL (–) (Orange) DL switch 2 (White) DL switch 2 (White) ------- DL switch (Red) +24V (Black) LED (+) (Blue)
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Page 50: Timing Chart
10. TIMING CHART Thread trimming signal DOWN position UP position Sewing machine 3000rpm Thread trimming Soft start 120rpm 170rpm Needle Up by reverse revolution Thread trimming solenoid valve output Tension release solenoid output Condensation solenoid valve output Threading switch input Threading solenoid valve output SC-380 program mode (standard adjustment value) -
Page 51: Table Of Troubles And Corrective Measures
11. 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 52 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 53 Troubles Causes Checking Corrective measures Loose stitches Clearance between the Check the clearance. Refer to “(6) 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 54 Troubles Causes Checking Corrective measures Irregular stitches Stroke of the thread take- Check the stroke of the Adjust the thread take-up spring to up spring is improper. thread take-up spring. move to approximately 1 mm from the initial position when hook draws thread maximumly.
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Page 55: 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 56 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 57 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 "(18) -3) Knife pressure". Knife pressure of the waiting knife is too high. Refer to Causes “Thread cannot Thread is not cut sharply.
- Page 58 Troubles Causes Checking Corrective measures From the previous page Refer to “(18) -3) Knife pressure”. Both needle and bobbin The blades of moving knife t h r e a d c a n n o t b e and waiting knife have trimmed.
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Page 59: Drawing Of The Table
Style of tpe : Helvetica Reg. Condensed drawer 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 60 1-needle, Unison-feed, Lockstitch Machine with Automatic Thread Trimmer (Needle thread roll-in and shorter-thread remaining type) LU-1520N-7 ENGINEER’S MANUAL 29359502 No.E351-00...
- Page 61 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.
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Page 62: Table Of Contents
CONTENTS 1. SPECIFICATIONS ....................1 2. STANDARD ADJUSTMENT ................2 (1) Needle entry position ......................2 (2) Longitudinal position of the feed dog ................2 (3) Lateral position of the feed dog..................4 (4) Height of the feed dog ....................... 4 (5) Height of the hook ....................... - Page 63 3. INSTALLATION OF THE OPTIONAL PARTS ..........42 (1) DL device (DL21 Kit F for installation after set-up of machine : GDL21000FA0) ..42 (2) Bobbin thread remaining amount detecting device (AE-10 Kit A : GAE10000AA0) ... 42 4. PORTION TO WHICH LOCKTITE IS APPLIED ..........43 5.
- Page 64 ＊ The description covered in this engineer's manual is subject to change for improvement of the TELEX : J22967 commodity without notice. Copyright C 2002 JUKI CORPORATION. All rights reserved throughout the world. 02 · 05 Printed in Japan (E)
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