JUKI LK-1900S Series User manual

1
INSTRUCTION MANUAL
LK-1900S Series

CONTENTS
I. EXPLANATION OF THE LK-1900S,
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................ 12
3-15. Installing the thread stand ............................. 13
3-16. In the case the machine is transported
after factory-completed at the time of
shipment .......................................................... 13
4. OPERATION OF THE SEWING MACHINE.....14
4-1. Lubrication....................................................... 14
4-2. Attaching the needle ....................................... 14
4-3. Threading the machine head.......................... 15
4-4. Installing and removing the bobbin case...... 15
4-5. Installing the bobbin ....................................... 16
4-6. Adjusting the thread tension.......................... 16
4-7. Adjusting the thread take-up spring.............. 17
5. OPERATION OF THE SEWING MACHINE
(BASIC)............................................................17
5-1. Selection of language ..................................... 17
5-2. Setting the pattern number............................. 18
5-3. Setting the item data ....................................... 18
5-4. Checking the contour of a sewing pattern.... 21
5-5. Sewing.............................................................. 22
5-6. Changing the pattern to a different one ........ 22
5-7. Winding a bobbin ............................................ 23
5-8. How to open the tension disk......................... 24
5-9. LED hand light ................................................. 25
6. OPERATION OF THE SEWING MACHINE
(ADVANCED)...................................................26
6-1. Performing sewing using the pattern keys .. 26
6-2. Sewing using the combination function
(cycle sewing).................................................. 31
6-3. Sewing through the use of the counter......... 34
6-4. How to use the temporary stop...................... 37
6-5. Copying or deleting various kinds of
pattern data...................................................... 38
6-6. Communication ............................................... 40
6-7. Cautions in operation...................................... 42
6-8. Setting enable/disable of standard pattern
invoking............................................................ 43
6-9. How to use the F key....................................... 44
6-10. Production support function........................ 45
7. MAINTENANCE...............................................51
7-1. Adjusting the height of the needle bar.......... 51
7-2. Adjusting the needle-to-shuttle relation........ 52
7-3. Adjusting the lift of the work clamp foot....... 53
7-4. The moving knife and counter knife.............. 53
7-5. Adjustment of the wiper.................................. 54
7-6. Draining waste oil............................................ 54
7-7. Amount of oil supplied to the hook ............... 55
7-8. Replacing the fuse........................................... 55
7-9. Replenishing the designated places with
grease............................................................... 56
8. HOW TO USE THE MEMORY SWITCH.........58
8-1. Method of changing memory switch data..... 58
8-2. List of the memory switch functions............. 59
9. OTHERS ..........................................................62
9-1. Table of the standard pattern specications 62
9-2. Table of the standard patterns ....................... 63
9-3. Table of the work clamp foot .......................... 65
9-4. Installing the foot pedal switch (optional)..... 67
9-5. Error list............................................................ 68
9-6. Message list ..................................................... 72
9-7. Troubles and corrective measures (sewing
conditions) ....................................................... 74
9-8. Table of the optional parts.............................. 76
II. EXPLANATION OF THE LK-1903S,
COMPUTER-CONTROLLED HIGH-
SPEED LOCKSTITCH BUTTON
SEWING MACHINE.............................78
1. SPECIFICATIONS............................................78
2. PREPARATION OF THE SEWING MACHINE 78
2-1. Installation of the sewing machine and
preparation of the operation .......................... 78
2-2. Needle and thread ........................................... 78
2-3. Various sewing modes.................................... 79
3. ADJUSTMENT OF THE SEWING MACHINE .80
3-1. Position of the button clamp jaw lever.......... 80
3-2. Adjusting the feed plate.................................. 81
3-3. Adjusting the button clamp jaw lever............ 82
3-4. Adjusting the lifting amount of the button
clamp................................................................ 82
3-5. Adjustment of the pressure of the work
clamp unit ........................................................ 83
3-6. Adjustment of the wiper spring...................... 83
4. OTHERS ..........................................................84
4-1. Installing the save button bar (accessory
part) .................................................................. 84
4-2. Model classication according to the
button size ....................................................... 84
4-3. Attaching the shank button (optional)........... 85
III. DRAWING OF THE TABLE ................89

1 
I. EXPLANATION OF THE LK-1900S, COMPUTER-
CONTROLLED HIGH-SPEED BARTACKING MACHINE
1. SPECIFICATIONS
1 Sewing area X (lateral) direction 40 mm Y (longitudinal) direction 30 mm
2 Sewing speed
Regular sewing speed :2,700 sti/min* (When sewing pitches are less than 5.5
mm in X-direction and 4.0 mm in Y -direction.)
Max. sewing speed :3,200 sti/min* (When sewing pitches are less than 5.0
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)
4Feed motion of work
clamp foot Intermittent feed (2-shaft drive by stepping motor)
5 Needle bar stroke 41.2 mm
6 Needle DP ×5, DP ×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 2,700 sti/min*(100 sti/min steps)
14 Pattern selection
Standard patterns: 51
User patterns: 1 to 200
Media patterns: 1 to 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 Mass Machine head 42 kg, Control box 5.1 kg
19 Power consumption 250 VA (Pattern No. 1, 2,700 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 AC220 to 240V ± 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 2,700 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 2,700 sti/min for the sewing cycle, 1.0s ON (Pattern :
No.1).
* Reduce the max. sewing speed in accordance with the sewing conditions.

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
󰿿LCD display Various data such as pattern
No., shape, etc. are displayed.
󱀀READY 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 performed.
󱀁RESET key Press this key when releasing
error, traveling the feed mech-
anism to its initial position,
counter resetting, etc.
󱀂MODE key This key is used for displaying
the mode screen.
󱀃PRESSER 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.
󱀄ITEM SELECT key This key is used to select the
data No. and other kinds of
data.
󱀅DATA 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
󱀆EDIT key This key is used to display the
edit screen, to select the item
or to display the detail screen.
󱀇RETURN 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 registered here can
sew immediately.
X/Y scale, sewing position,
etc. can be changed and reg-
istered.
󱢴FUNCTION key
(F key)
This is the shortcut key to
which a parameter can be
registered.
󱢵INFORMATION key This key used to carryout
setting and checking of the
production counter and the
production support function.
󱢶SET READY LED The LED lights up under the
sewing mode.
󰿿
󱢳
󱀇
󱢴
󱢵
󱀄 󱀅󱀆
󱀀󱢶 󱀃 󱀂󱀁

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
3-4. Installing the head support rod
󰿿
󱀀
󰿿
󱀀
󱀁
󱀁
󱤨
󱤩
1) Fix connecting rod 󰿿to installing hole 󱤩of ped-
al lever 󱀀with nut 󱀁.
2) The pedal depressing stroke is decreased by
tting connecting rod 󰿿in mounting hole 󱤨.
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
(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
220 V
-240 V
• Connecting single phase 220V, 230V and 240V
󰿿
󱀀
󱀁
Rating plate
Power indication tag
Brown
(1) Installing the power switch
Fix power switch 󰿿under the machine table with
wood screws 󱀀.
Fix the cable with staples 󱀁supplied with the ma-
chine as accessories in accordance with the forms of
use.

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 x the spring washer on
hinge rubber 󱀅with nut 󱀄.
2. Mount hinge rubber 󱀅while orient-
ing its corner section C toward the
machine head side. Be aware that the
hinge rubber fails to function properly
if nuts 󱀃and 󱀄are excessively tight-
ened.
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.
3. The LED light is installed to the undersurface of the frame. Do not hold the LED light when
moving the frame.
󱤨
󱤨󰿿
󰿿
󱀁
󱀂
󱀃
󱀄
󱀁
󱀃
󱀄
󱀂󱀂
󱀂A
B
󱀀
C
Machine
head side
C
󱀅
Machine
head side

8 
Remove tape 󰿿 xing the lever section of safety switch 󱀀.
In case error 302 occurs when the sewing machine works after setup, loosen the safety switch 󱀀
tting screw with a screwdriver, and lower the switch to the downside of the sewing machine.
3-9. Safety switch
1) Fix drain receiver 󱀀in the installing hole of table
󰿿with two setscrews 󱀁.
2) Screw poly-oiler 󱀂in waste oil reservoir 󱀀.
3) Insert sewing-machine waste oil pipe 󱀃into po-
ly-oiler 󱀂.
4) Insert head support rubber 󱀄into table 󰿿.
5) Pass bundle 󱀅of cords through slotted hole 󱀆
in the table.
1. Insert drain pipe 󱀃until it will go no fur-
ther so that it does not come off drain
bin 󱀂when tilting the machine head.
2. Remove the tape xing drain pipe
󱀃
.
3-8. Installing the drain receiver and the head support rubber
DANGER:
When using the safety switch without removing tape 󰿿, it is very dangerous since the sewing ma-
chine works even in the state that it is tilted.
󰿿
󱀀
󱀃
󱀂
󱀁
󱀄
󱀄
󱀅
󱀆
󰿿
󱀀
󱀀

9 
3-11. Installing the operation panel
When tilting the sewing machine head, tilt the head
gently until it comes in contact with head support rod
󰿿.
1. Before tilting the sewing machine head,
make sure that head support rod 󰿿is
attached to the machine table.
2. When raising the sewing machine
head, do not raise it while holding
motor cover 󱀀. It will be the cause of
breakage of motor cover 󱀀.
3. Be sure to tilt the sewing machine head
on a at place to prevent it from falling.
3-10. Tilting the sewing machine head
󰿿
󱀀
WARNING :
Tilt/raise the sewing machine head with both hands taking care not to allow your ngers to be caught
in the head. Turn OFF the power before starting the work so as to prevent accidents caused by abrupt
start of the sewing machine.
Fix operation panel mounting plate 󰿿on the table
with four wood screws 󱀀. Then, pass the cable
through hole 󱀁in the table.
In the case of installing the operation panel on the
undersurface of the table, install the operation panel
on panel mounting plate 󰿿by tightening screws 󱀂
in four mounting holes. Then, x the panel mounting
plate at a desired position on the undersurface of the
table with four wood screws 󱀀.
󱀀
󰿿
󱀂
󱀀
󰿿
󱀁

10 
CN17
CN15
CN42
CN43
CN44
CN47
CN40
CN30
CN34
4P
9P
6P
6P
4P
2P
30P
26P
󱀀
󰿿
CN44 Black
SDC PWB
MAIN PWB
CN40 White
CN34 Gray
CN30 Gray
CN42 White
CN43 Blue
CN15 White
CN17 White
Shielded
ground wire
A
3P
3-12. Connecting the cords
1) Loosen four setscrews 󱀀of control box cover 󰿿.
Remove control box cover 󰿿.
2) Connect the cords to the respective connectors
on MAIN PWB, SDC PWB. (Fig. 1)
3) Fix the ground wire on position Aof the control
box with a screw. (Fig. 2)
DANGER :
To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing
machine, carry out the work after turning OFF the power switch and a lapse of 5 minutes or more.
To prevent accidents caused by unaccustomed work or electric shock, request the electric expert
or engineer of our dealers when adjusting the electrical components.
SDC PWB
MAIN PWB
White
White
White
White
Gray
Gray
Blue
Black
White
CN47 White
(Fig. 1) (Fig. 2)
Sewing
machine head
Operation panel
Pedal sensor
CN53 3P Yellow
CN54 4P Red
CN54 Red
CN53 Yellow

11 
󱀁
󱀂
3-13. Handling the cords
1) Bring the cords under the table into the control
box.
2) Put the cord brought into the control box through
cord exit plate 󰿿 and x cable clip band 󱀀.
Arrange the cord so that it is not tensed
or hitched even when the machine head is
tilted. (See A section)
DANGER :
To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing
machine, carry out the work after turning OFF the power switch and a lapse of 5 minutes or more.
To prevent accidents caused by unaccustomed work or electric shock, request the electric expert
or engineer of our dealers when adjusting the electrical components.
3) Install control box lid 󱀁with four setscrews 󱀂.
󱀀
󰿿
󰾰
A

12 
Be sure to use eye protection cover 󰿿after installing
it on installing section 󱀁with screws 󱀀.
3-14. Installing the eye protection cover
󰿿
WARNING :
Be sure to attach this cover to protect the eyes from the disperse of needle breakage.
󱀁
󱀀
󱀀
󱀃
󱀂
Pass LED cord 󱀃through accessory cord clamp 󱀂
supplied with the unit as shown in the gure. Fix the
LED cord with screw 󱀀located at the lower section
of eye protection cover 󰿿.

13 
3-15. Installing the thread stand
1) Assemble the thread stand unit, and insert it in
the hole in the machine table.
2) Tighten locknut 󰿿 to x the thread stand.
3) For ceiling wiring, pass the power cord through
spool rest rod 󱀀.
3-16. In the case the machine is transported after factory-completed at the time
of shipment
Pass bed xing bolt 󱀁, plain washer 󱀂and nut 󱀃through hole 󰿿in the table and hole 󱀀in the sewing
machine bed to x the bed on the table.
󰿿
󱀀
󰿿
󱀀
󱀃
󱀂
󱀁

14 
Check that the place between lower line Band upper
line A is lled with oil. Fill there with oil using the oiler
supplied with the machine as accessories when oil is
short.
* The oil tank which is lled with oil is only for lubri-
cating to the hook portion. It is possible to reduce
the oil amount when the number of rotation used
is low and the oil amount in the hook portion is
excessive. (Refer to "I.7-7. Amount of oil sup-
plied to the hook" p.55.)
1. Do not lubricate to the places other
than the oil tank and the hook of Cau-
tion 2 below. Trouble of components
will be caused.
2. When using the sewing machine for
the rst time or after an extended pe-
riod of disuse, use the machine after
lubricating a small amount of oil to the
hook portion. (Refer to "I.7-2. Adjusting
the needle-to-shuttle relation" p.52.)
Loosen setscrew 󰿿and hold needle 󱀀with the long
groove 󱀁facing toward you. Then fully insert it into
the hole in the needle bar, and tighten setscrew 󰿿.
If the stitches are made as shown in 󱤨,
attach the needle facing to the direction 󱤩
to a small extent.
4. OPERATION OF THE SEWING MACHINE
4-1. Lubrication
4-2. Attaching the needle
󱀀
󱀁
󱤨
󱤩
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
󰿿
A
B

15 
1) Open hook cover 󰿿.
2) Raise latch 󱀁of bobbin case 󱀀, and remove
the bobbin case.
3) When installing the bobbin case, fully insert it into
the shuttle shaft, and close the latch.
If it is not fully inserted, bobbin case 󱀀
may slip off during sewing.
4-3. Threading the machine head
Pull out the thread by approximately 40 mm from the needle after threading through the needle.
If it is difcult to thread the machine head, refer to "I.5-8. How to open the tension disk" p.24.
4-4. Installing and removing the bobbin case
󰿿
󱀀
󱀁
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Thin lament thread or the like
󰿿
For thick thread, pass the thread through one hole only of needle bar thread guide 󰿿.
Type H

16 
4-6. Adjusting the thread tension
󰿿
Short
Long
1) Set the bobbin 󰿿into bobbin case 󱀀in the di-
rection shown in the gure.
2) Pass the thread through thread slit 󱀁of bobbin
case 󱀀, and pull the thread as it is. By so doing,
the thread will pass under the tension spring and
be pulled out from thread hole 󱀂.
3) Pass the thread through thread hole 󱀃of the
horn section, and pull out the thread by 25mm
from the thread hole.
If the bobbin is installed in the bobbin
case orienting the reverse direction, the
bobbin thread pulling out will result in an
inconsistent state.
4-5. Installing the bobbin
󰿿󱀀
󱀃
󱀂
󱀁
25mm
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
󱀁
If thread tension controller No. 1 󰿿is turned clock-
wise, the length of remaining thread on the needle
after thread trimming will be shorter. If it is turned
counterclockwise, the length will be longer.
Shorten the length to an extent that the thread is not
slipped off.
Adjust the needle thread tension with 󱀀. Adjust the
bobbin thread tension with 󱀁.
󱀀

17 
4-7. Adjusting the thread take-up spring
5-1. Selection of language
When you turn ON the power to the sewing machine
for the rst time after the purchase, the language
selection screen is displayed. Select the language to
be displayed, then press RETURN key 󱀇.
The language to be displayed on the screen can
be changed by means of the memory switch U239
"Language selection". Refer to "I.8. HOW TO USE
THE MEMORY SWITCH" p.58 for the details of
the memory switch.
If you terminate the language selection by
pressing RETURN key 󱀇without se-
lecting the language, the language selection
screen will be displayed every time you turn
ON the power to the sewing machine.
5. OPERATION OF THE SEWING MACHINE (BASIC)
Set each item following the procedure described below.
󱀇
The standard stroke of thread take-up spring 󰿿is 8
to 10 mm, and the pressure at the start is 0.1 to 0.3N.
1) Adjusting the stroke
Loosen setscrew 󱀀, and turn thread tension
asm. 󱀁.
Turning it clockwise will increase the moving
amount and the thread drawing amount will in-
crease.
2) Adjusting the pressure
To change the pressure of the thread take-up
spring, insert a thin screwdriver into the slot of
thread tension post 󱀂while screw 󱀀is tightened,
and turn it. Turning it clockwise will increase the
pressure of the thread take-up spring. Turning it
counterclockwise will decrease the pressure.
In the case you have adjusted the amount
of travel of the thread take-up spring 󰿿,
check the dish of the thread tension cou-
pled body is closed.
It may cause sewing defects.
󰿿
󱀂
󱀁󱀀
3.5 mm

18 
The setting exceeding 100% is dangerous
since needle and the cloth presser inter-
feres with each other and needle breakage
or the like will occur.
Turn ON the power switch.
The pattern number is displayed at the upper left por-
tion of the screen. The pattern shape, X/Y scale rate
and sewing speed of the pattern are also displayed.
When you press DATA CHANGE key 󱀅, the
pattern number can be changed.
5-3. Setting the item data
When you press EDIT key 󱀆 , the item data input screen is displayed.
The items that can be edited are displayed on the left section of the screen and the set contents are dis-
played on the right section of the screen.
Select an item with ITEM SELECT key 󱀄. Then, change the set content with DATA CHANGE key
󱀅.
(1) Inputting the X size
Press ITEM SELECT key 󱀄to display the
C001 X size.
Press DATA CHANGE key 󱀅to display the
value you desire.
One of the input method for the X/Y sizes can be
selected; i.e., by inputting a percentage (%) with
memory switch U064 or by inputting an actual value.
(Initial value: Input in terms of percentage (%))
5-2. Setting the pattern number
󱀅
󱀄󱀅 󱀆
Refer the pattern No. to the separate table.