JUKI LK-1900B series User manual

ENGLISH
LK-1900B Series
INSTRUCTION MANUAL

i
CONTENTS
I. EXPLANATION OF LK-1900B,
COMPUTER-CONTROLLED HIGH-
SPEED BARTACKING MACHINE ........1
1. SPECIFICATIONS..............................................1
2. CONFIGURATION .............................................2
2-1. Names of main unit ........................................... 2
2-2. Names and explanation of switches on the
operation panel.................................................. 3
3. INSTALLATION..................................................4
3-1. Installing the electrical box .............................. 4
3-2. Installing the pedal sensor ............................... 4
3-3. Attaching the connecting rod........................... 5
3-4. Installing the head support rod........................ 5
3-5. Installing and connecting the power switch... 6
3-6. How to carry the sewing machine.................... 7
3-7. Installation of the sewing machine head......... 7
3-8. Installing the drain receiver and the head
support rubber................................................... 8
3-9. Safety switch...................................................... 8
3-10. Tilting the sewing machine head..................... 9
3-11. Installing the operation panel .......................... 9
3-12. Connecting the cords ..................................... 10
3-13. Handling the cords.......................................... 11
3-14. Installing the eye protection cover................ 11
3-15. Installing the thread stand ............................. 12
3-16. In the case the machine is transported
after factory-completed at the time of
shipment .......................................................... 12
4. OPERATION OF THE SEWING MACHINE.....13
4-1. Lubrication....................................................... 13
4-2. Attaching the needle ....................................... 13
4-3. Threading the machine head.......................... 14
4-4. Installing and removing the bobbin case...... 14
4-5. Installing the bobbin ....................................... 15
4-6. Adjusting the thread tension.......................... 15
4-7. Adjusting the thread take-up spring.............. 16
4-8. Example of the thread tension ....................... 16
5. OPERATION OF THE SEWING MACHINE
(BASIC)............................................................16
5-1. Selection of language ..................................... 16
5-2. Setting the pattern number............................. 17
5-3. Setting the item data ....................................... 17
5-4. Checking the contour of a sewing pattern.... 20
5-5. Sewing.............................................................. 21
5-6. Changing the pattern to a different one ........ 21
5-7. Winding a bobbin ............................................ 22
5-8. Thread clamp device....................................... 23
6. OPERATION OF THE SEWING MACHINE
(ADVANCED)...................................................25
6-1. Performing sewing using the pattern keys .. 25
6-2. Sewing using the combination function
(cycle sewing).................................................. 30
6-3. Sewing through the use of the counter......... 33
6-4. How to use the temporary stop...................... 36
6-5. Setting the pattern thread tension................. 37
6-6. Copying or deleting various kinds of
pattern data...................................................... 38
6-7. Communication ............................................... 40
6-8. Cautions in operation...................................... 42
6-9. Setting enable/disable of standard pattern
invoking............................................................ 43
7. MAINTENANCE...............................................44
7-1. Adjusting the height of the needle bar.......... 44
7-2. Adjusting the needle-to-shuttle relation........ 45
7-3. Adjusting the lift of the work clamp foot....... 46
7-4. The moving knife and counter knife.............. 46
7-5. Needle thread clamp device ........................... 47
7-6. Adjustment of the wiper.................................. 47
7-7. Draining waste oil............................................ 48
7-8. Amount of oil supplied to the hook ............... 48
7-9. Replacing the fuse........................................... 48
7-10. Replenishing the designated places with
grease............................................................... 49
8. HOW TO USE THE MEMORY SWITCH.........51
8-1. Method of changing memory switch data..... 51
8-2. List of the memory switch functions............. 52
9. OTHERS ..........................................................56
9-1. Table of the standard pattern specications 56
9-2. Table of the standard patterns ....................... 57
9-3. Table of the work clamp foot .......................... 59
9-4. Installing the foot pedal switch (optional)..... 61
9-5. Error list............................................................ 62
9-6. Message list ..................................................... 67
9-7. Troubles and corrective measures (sewing
conditions) ....................................................... 69
9-8. Table of the optional parts.............................. 71
II. EXPLANATION OF THE LK-1901B,
COMPUTER-CONTROLLED HIGH-
SPEED EYELET BUTTONHOLE
BARTACKING MACHINE....................73
1. SPECIFICATIONS............................................73
2. INSTALLATION OF THE SEWING
MACHINE AND PREPARATION OF THE
OPERATION ....................................................73
3. PREPARATION OF THE SEWING MACHINE 74
3-1. Adjustment of the material closing amount.. 74
3-2. Adjustment of the lift of the work clamp foot74
3-3. Adjustment of the pressure of the work
clamp unit ........................................................ 75
3-4. Setting of the material closing operation...... 75
4. OPERATION OF THE SEWING MACHINE.....76
4-1. Selection and conrmation of the sewing
patterns ............................................................ 76
III.EXPLANATION OF THE LK-1902B,
COMPUTER-CONTROLLED HIGH-
SPEED BELT-LOOP ATTACHING
MACHINE ............................................77
1. SPECIFICATIONS............................................77
2. PREPARATION OF THE SEWING MACHINE 77
2-1. Threading the machine ................................... 77
3. OPERATION OF THE SEWING MACHINE.....78
3-1. Selection and conrmation of the sewing
patterns ............................................................ 78
3-2. Combination of the work clamp foot and
the feed plate ................................................... 78

ii
IV.EXPLANATION OF THE LK-1903B,
COMPUTER-CONTROLLED HIGH-
SPEED LOCKSTITCH BUTTON
SEWING MACHINE.............................79
1. SPECIFICATIONS............................................79
2. PREPARATION OF THE SEWING MACHINE 79
2-1. Installation of the sewing machine and
preparation of the operation .......................... 79
2-2. Needle and thread ........................................... 79
2-3. Various sewing modes.................................... 80
3. ADJUSTMENT OF THE SEWING MACHINE .81
3-1. Position of the button clamp jaw lever.......... 81
3-2. Adjusting the feed plate.................................. 82
3-3. Adjusting the button clamp jaw lever............ 83
3-4. Adjusting the lifting amount of the button
clamp................................................................ 83
3-5. Adjustment of the pressure of the work
clamp unit ........................................................ 84
3-6. Adjustment of the wiper spring...................... 84
4. OTHERS ..........................................................85
4-1. Installing the save button bar (accessory
part) .................................................................. 85
4-2. Model classication according to the
button size ....................................................... 85
4-3. Attaching the shank button (optional)........... 86
V. EXPLANATION OF THE LK-
1903BBS HIGH-SPEED COMPUT-
ER-CONTROLLED FLAT BUTTON
SEWING MACHINE (WITH THE
BIRD'S NEST PREVENTING AND
SHORTER-THREAD REMAINING
TYPE THREAD TRIMMER).................90
1. SPECIFICATIONS............................................90
2. PREPARATION OF THE SEWING MACHINE 90
2-1. Installation of the sewing machine and
preparation of the operation .......................... 90
2-2. Installing the regulator and solenoid valve
asm. .................................................................. 91
2-3. Installing the air hose...................................... 91
2-4. Connecting the cords...................................... 92
2-5. Connecting the air piping ............................... 93
2-6. Installing the cloth chip bag........................... 95
2-7. Fixing the nger guard.................................... 95
2-8. Needle and thread ........................................... 96
2-9. Various sewing modes.................................... 96
3. ADJUSTMENT OF THE SEWING MACHINE .97
3-1. Adjusting the knife for the shorter thread
remaining thread trimmer............................... 97
3-2. Adjusting the suction pipe for the shorter-
thread remaining type thread trimmer .......... 98
3-3. Replacing the knife of the shorter-thread
remaining type thread trimmer ...................... 99
3-4. Adjusting the work clamp rod (For
1903BBS only) ............................................... 100
3-5. Replacing the non-slip sheet (For
1903BBS only) ............................................... 100
4. MAINTENANCE.............................................101
4-1. Cleaning the inside of the hook cover......... 101
4-2. Cleaning the thread clamp............................ 101
VI. EXPLANATION OF THE LK-1900BB
COMPUTER-CONTROLLED, HIGH-
SPEED BARTACKING MACHINE
(WITH THE BIRD'S NEST PREVENT-
ING AND SHORTER-THREAD RE-
MAINING TYPE THREAD TRIMMER) .102
1. SPECIFICATIONS..........................................102
2. PREPARATION OF THE SEWING
MACHINE.......................................................103
2-1. Table of the sewing patterns ........................ 103
3. ADJUSTMENT OF THE SEWING MACHINE105
3-1. Replacing the bird's nest preventing knife . 105
VII. DRAWING OF THE TABLE.............106

1 
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
2 Max. sewing speed 3,200 sti/min*(When sewing pitches are less than 5 mm in X-direction
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 Intermittent feed (2-shaft drive by stepping motor)
5 Needle bar stroke 41.2 mm
6 Needle DP x 5, DP x 17
7 Lift of work clamp foot 13 mm (standard) Max. 17 mm
8 Shuttle Standard semi-rotary hook (oil wick lubrication)
9 Lubricating oil New Defrix Oil No. 2 (supplied by oiler)
10 Data recording Memory in MAIN PCB (80 Kbite)
11 Enlarging / Reducing facility 20% to 200% (1% step) in X direction and Y direction respectively
12 Enlarging / Reducing method Pattern enlargement / reduction can be done by increasing/decreasing
the stitch length
13 Max. sewing speed limitation 400 to 3,200 sti/min*(100 sti/min steps)
14 Pattern selection
Standard patterns: 51
User patterns: 1 - 200
Media patterns: 1 - 999
15 Bobbin thread counter UP/DOWN type (0 to 9999)
16 Sewing machine motor Servo motor
17 Dimensions W : 1,200 mm L : 660 mm H : 1,100 mm
(Use the standard table and stand.)
18 Weight Machine head 42 kg, Control box 5.1 kg
19 Power consumption 250 VA (Pattern No. 1, 3,200 sti/min, 2-sec pause time)
20 Operating temperature range 5 ˚C to 35 ˚C
21 Operating humidity range 35% to 85% (No dew condensation)
22 Line voltage Rated voltage ± 10% 50/60 HZ
23 Noise - Equivalent continuous emission sound pressure level (LpA) at the
workstation :
A-weighted value of 82 dB; (Includes KpA = 2.5 dB); according to ISO
10821- C.6.3 -ISO 11204 GR2 at 3,200 sti/min for the sewing cycle,
1.0s ON (Pattern : No.1).
- Sound power level (LWA) ;
A-weighted value of 89 dB; (Includes KWA = 2.5 dB); according to ISO
10821- C.6.3 -ISO 3744 GR2 at 3,200 sti/min for the sewing cycle, 1.0s
ON (Pattern : No.1).
* Reduce the max. sewing speed in accordance with the sewing conditions.
Max. sewing speed of LK-1900BWS (double capacity hook) is 2,700 sti/min.

2 
2. CONFIGURATION
2-1. Names of main unit
󰿿Machine head
󱀀Work clamp feet
󱀁Thread stand
󱀂Operation panel
󱀃Power switch
󱀄Control box
󱀅Pedal
󱀆Power switch (EU type)
󰿿
󱀀
󱀁
󱀂
󱀃
󱀄
󱀅
󱀆

－3 －
2-2. Names and explanation of switches on the operation panel
No. NAME FUNCTION
❶LCD display Various data such as pattern
No., shape, etc. are dis-
played.
❷READY key Press this key when starting
sewing.
Every time this key is
pressed, change-over of
sewing ready set state and
data set state can be per-
formed.
❸RESET key Press this key when releas-
ing error, traveling the feed
mechanism to its initial posi-
tion, counter resetting, etc.
❹MODE key This key is used for display-
ing the mode screen.
❺PRESSER and
WINDER key
This key lifts or lowers the
presser. When the presser
goes up, the needle bar trav-
els to the origin and when it
comes down, the needle bar
travels to the right.
This key is pressed when
performing bobbin winding.
❻ITEM SELECT key This key is used to select the
data No. and other kinds of
data.
❼DATA CHANGE key This key is used to change
the pattern No. and other
kinds of data.
This key is used to move the
feed forward on a stitch-by-
stitch basis.
No. NAME FUNCTION
❽EDIT key This key is used to display
the edit screen, to select the
item or to display the detail
screen.
❾RETURN key This key is used to return the
screen to the previous one.
󱢳DIRECT PATTERN This key registers the
pattern. When this key is
pressed, the pattern regis-
tered here can sew immedi-
ately.
X/Y scale, sewing position,
etc. can be changed and
registered.
󱢴
THREAD TENSION key The thread tension screen is
displayed.
󱢵THREAD CLAMP
key
This key selects effective/
ineffective of needle thread
clamp. When it is effective,
needle thread clamp display
LED lights up. (Note)
󱢶THREAD CLAMP
LED
When this LED lights up,
needle thread clamp oper-
ates.
󱢷SET READY LED The LED lights up under the
sewing mode.
(Note ) 1. LK-1903B is set to needle thread clamp
prohibited (no motion) with memory switch
U035 at the time of standard delivery.
2.For the LK-1903BBS, the thread clamp
key is disabled.
❶
❷󱢷 ❺ ❹❸
❽
❾
󱢳
󱢴
󱢵
󱢶
❻ ❼

4 
3. INSTALLATION
3-1. Installing the electrical box
Install control box 󰿿to the location illustrated in the
gure using four bolts 󱀀, four plain washers 󱀁and
four spring washers 󱀂and four hexagonal nuts 󱀃
supplied with the unit.
Bolt 󱀀is a cup head square neck bolt (M8;
Length: 70 mm) and nut 󱀃is a hexagonal
nut (M8).
󰿿
󱀁
󱀂
󱀃
󰿿
󱀀
Install the pedal sensor 󰿿to the table with mounting
screws 󱀀supplied with the unit.
3-2. Installing the pedal sensor
󱀀

5 
3-3. Attaching the connecting rod
1) Fix connecting rod 󰿿to installing hole 󱤩of pedal
lever 󱀀with nut 󱀁.
2) The pedal depressing stroke is decreased by tting
connecting rod
󰿿
in mounting hole 󱤨.
3-4. Installing the head support rod
Drive head support rod 󰿿in hole 󱀀in the machine
table.
󰿿
󱀀
󰿿
󱀀
󱀁
󱀁
󱤨
󱤩

6 
Never use under the wrong voltage and
phase.
3-5. Installing and connecting the power switch
(1) Installing the power switch
Fix power switch 󰿿under the machine table with
wood screws 󱀀.
Fix the cable with staples 󱀁supplied with the machine
as accessories in accordance with the forms of use.
(2) Connecting the power source cord
Voltage specications at the time of delivery from the factry are indicated on the voltage indication seal. Con-
nect the cord in accordance with the specications.
Table
Brown Brown
Light blue Light blue
Light
blue
Green/Yellow Green/
Yellow
Control box
Green/Yellow
Plug
Power source cord
Power switch
GND
AC
200 V
-240 V
AC
200 V
-240 V
• Connecting single phase 200V, 220V, 230V and 240V
Table
Red
Black
Green/Yellow
White
Control box
Power source cord
Plug
Power switch
GND
• Connecting three phase 200V, 220V, 230V and 240V
Green/Yellow
Red
White
Black
Green/
Yellow
Red
White Black
󰿿
󱀀
󱀁
Rating plate
Power indication tag
(For example: In
the case of 200V)
Brown

7 
1) Fit hinge rubber cushion 󰿿over the hinge shaft.
2) Install the main body of the sewing machine on
the table with four bolts 󱀀, four plain washers 󱀁,
four spring washers 󱀂, four hexagonal nuts 󱀃
and four hexagonal nuts 󱀄.
1. Tighten nut 󱀃until spring washer 󱀂is
brought to the state as illustrated in Fig.
B and fix the spring washer on hinge
rubber 󱀅with nut 󱀄.
2. Mount hinge rubber 󱀅while orienting
its corner section C toward the machine
head side. Be aware that the hinge rub-
ber fails to function properly if nuts 󱀃
and 󱀄are excessively tightened.
3. When carrying the sewing machine,
hold sections 󱤨with hands to support
the side faces of the sewing machine.
3-7. Installation of the sewing machine head
WARNING :
To prevent possible accidents caused by the full of the sewing machine, perform the work by two
persons or more when the machine is moved.
A
3-6. How to carry the sewing machine
To carry the sewing machine, it is necessary to hold Asection and support the side faces of the sewing ma-
chine by hand as illustrated in the gure.
1. Carefully prevent slippage of your hand that holds the cover.
2. The sewing machine weighs over 42 kg. Be sure to carry the sewing machine with two or
more people without exceptions.
󱤨
󱤨󰿿
󰿿
󱀁
󱀂
󱀃
󱀄
󱀁
󱀃
󱀄
󱀂󱀂
󱀂A
B
󱀀
C
Machine
head side
C
󱀅
Machine
head side