JUKI LK-1903A User manual

LK-1903A-SS-301 (Table stand is optionally available.)
The active tension mechanism is provided with the machine as standard.
LK-1903A SERIES
Computer-controlled, High-speed, Lockstitch, Button Sewing Machine
LK-1903A
LK-1903A/BR35(with button feeder)

LK-1903A
LK-1903A
LK-1903A-SS-301
Active tension
The machine achieves sewing speed of 2,700rpm. The machine's
starting, stopping, thread-trimming and automatic presser lifting
speeds have been increased to significantly shorten total cycle time.
STANDARD PANEL
Functional settings, such as pattern numbers and needle thread
tensions can be established through the operation panel with
ease. Distance between holes in a button can be easily
changed by means of pattern enlargement/reduction feature.
Standard sewing patterns can be assigned to pattern keys P1
to P50. Any of the sewing patterns assigned to the P1 to P25
pattern keys can be activated with a touch of the
corresponding key. This means that workability is improved by
assigning 25 sewing patterns that are most frequently used to
those pattern keys.
As many as 20 different cycle sewing patterns, each of which
combines a maximum of 30 different sewing patterns, can
be stored in the memory.
The operation panel has
been installed at an angle
and can be placed at the
top, bottom, right or left
part of the table according
to the operator's preference.
IP-410B
A large color LCD touch panel has been adopted for the display.
It gives clear displays that allow the operator to understand
operating procedures.
The IP-410B panel can be connected to a personal computer
and can store data on CompactFlash. This allows data to
be exchanged or shared among
sewing machines installed in a
factory or among remote
factories.
The IP-410B panel has been
provided with a process
improvement supporting feature
through the indication of the
operational state of the sewing
machine, and a maintenance and
management feature for
indicating the needle changing
timing and cleaning timing.
Higher productivity.
OPERATION PANEL (You can choose operation panel.)
Since the machine is provided with active tension
mechanism, it is able to set a needle thread
tension that matches various sewing conditions
(such as thread, material and sewing speed) on
the operation panel, store the data in memory
and reproduce it.
The needle thread tension can be set separately
according to the portion of a seam, such as the
beginning of a seam, during sewing and end of
the seam (fastening stitch).
When the operation panel IP-410B is used with
the machine, the needle thread tension can be
established on a stitch-by-stitch basis for upgraded
seam quality.
The machine is provided as standard
with the active tension (electronic
thread tension control mechanism).
The machine is provided as standard with 50 different sewing
patterns. The machine permits easy changeover of sewing patterns for
effortless execution of an inexhaustible range of sewing specifications.
The LK-1903A is also able to sew buttons using the same data used for
the LK-1903 (EP-ROM).
Many different sewing patterns.
Newly developed needle thread grasping mechanism helps produce
consistent knot tying at the beginning of sewing. (This device has been
factory-set to “invoking prohibited” status at the time of delivery.)
Excellent seam quality.
The machine is provided as standard with auto-lifter that uses a
new stepping-motor system. This helps reduce operator fatigue.
It is also possible to change over the stroke of the auto-lifter from a one-
step stroke to a double-step stroke, which offers easier positioning of a
material on the machine. For the double-step stroke, an intermediate
stopping height can be established on the operation panel.
The work clamp foot lift can be set to a maximum of 13mm.
Auto-lifter mechanism utilizing a new system.
In cases where the needle entry point for button sewing is to be
corrected, the sewing starting point can be corrected without the
adjustment of the relevant mechanism.
The sewing starting point can be corrected.
Thanks to our advanced dry-head technology, the frame (needle bar
and thread take-up) no longer requires lubrication. This prevents
the material from being stained with lubricating oil.
Just a small quantity of clean oil is supplied from the oil tank to the
hook.
Oil stains are eliminated.

B
A
1.5mm or more
X
Y
øB øC
A
✽(1) Standard sewing lengths X and Y given above are given assuming
that the scale is 100.
(2) Use the patterns No. 34~50 with hole diameter 1.5mm or less.
■ TABLE OF THE SEWING PATTERNS
B (mm) A (mm)
Min Max
149
338
5––7
1 •34
2 •35
3
4
5 •36
6 •37
7
8
9 •38
10 •39
11
12 •40
13 •41
14
15 •42
16 •43
17
18 •44
19 •45
20
21
22
23 •46
24
25
26 •47
27
28 •48
29
30 •49
31
32 •50
33
6-6
8-8
10-10
12-12
6-6
8-8
10-10
12-12
6-6
8-8
10-10
6-6
8-8
10-10
6-6
8-8
10-10
6
8
10
12
16
6
10
12
6-6
10-10
6-6
10-10
5-5-5
8-8-8
5-5-5
8-8-8
3.4
3.4
0
3.4
3.0
3.4
0
3.4
3.4
2.5
Pattern No. Stitch shape
Sewing thread
(pcs.)
Standard length
X (mm)
Standard length
Y (mm)
Pattern No. Stitch shape
Sewing thread
(pcs.)
Standard length
X (mm)
Standard length
Y (mm)
Optional part for shank button
Part No. Name of part
14146054 Pick-up device complete
D1401M1YC0A Needle bar (for TQ-1)
MAZ160170A0 Wiper (asm.)
40015434 Moving plate link A
14148209 Bushing
SL6030892TN (2 pcs.) Screw
MAZ16015000 Button support link
SD0640321TP Hinge screw
40010103 Connecting link
SL6040892TN (2 pcs.) Screw
MAZ16021000 Needle hole guide
MTQ300B1400 Needle TQ×3 #14
Model name Option
Button type For shank button
Max. sewing speed 1,500rpm
Outside diameter ø8~ø20
Diameter of hole in button ø1.5 or more
Button
configuration Position of hole in button
Configuration of
shank
Pattern No. 18, 19, 20, 21, 22
● Parts shown in parentheses ( ) are optional. ✽Engraved marker
■ MODELS CLASSIFIED BY BUTTON SIZES
Model name LK-1903A-301 LK-1903A-302 Option
Button size For extra-small button
For small button (accessory) For medium-size button For large button
Outside diameter
that can be adjusted (mm)
ø8~ø9 ø9~ø10 ø10~ø15 ø10~ø20 ø10~ø20 ø15~ø32
Sewing Length (Y) 0~2.5 0~3.0 0~3.5 0~3.5 0~4.5 0~6.5
size (mm) Width (X) 0~2.5 0~3.0 0~3.5 0~3.5 0~4.5 0~6.5
1.7 2.0
Thickness 1.7 (2.2) (2.2) 2.7
(mm) (2.2) (2.7) (2.7) (3.2)
✽(0.9) ✽✽ ✽
MAZ158070BB G 14148852 K 14149058 L MAZ157070BB D
Button clamp
Right
(MAZ158070BA) F (MAZ155070B0) B (MAZ155070B0) B (MAZ157070BA) E
jaw lever
–– –– (MAZ156070B0) C (MAZ156070B0) C –– ––
(combination)
Part No.
–– –– (B25553720A0) –– –– –– –– ––
MAZ158080BB G 14148951 K 14149157 L MAZ157080BB D
Left
(MAZ158080BA) F (MAZ155080B0) B (MAZ155080B0) B (MAZ157080BA) E
–– –– (MAZ156080B0) C (MAZ156080B0) C –– ––
–– –– (B25573720A0) –– –– –– –– ––
1.6 (1.6)
Needle hole A(1.8) (1.8) 1.6 1.4
guide (mm) (1.1)
Bø2.8 (ø3.5) ø3.5 ø3.5
Cø1.6 (ø1.6) ø2.0 ø2.0
MAZ15801000 (MAZ15501000)
Part No. (14149900) (14149603) MAZ15601000 MAZ15701000
–– (D2426284Y00)
Feed plate MAZ15502000(M8.5) ←MAZ15602000(M10) MAZ15702000(M12.5)

LK-1903A /BR35
LK-1903A /BR35
Newly developed machine head, LK-1903A is adopted. LK-1903A/BR35 is now available.
It provides better productivity as it achieves the maximum
speed of 2,700rpm (2,500rpm in normal use) and is
equipped with the high speed trimmer.
With our original horizontal forced feed mechanism, the
button carrier sets a button in position so that the
operation is simplified. Furthermore, operator fatigue is
reduced since what operator needs to do is only setting
material and pressing a pedal.
LK-1903A-SS311/BR35
The variety of functions can be easily adjusted by the simplified
operation panel. Alarm lamp will be activated when problem is
detected so that proper measures can be taken quickly.
OPERATION PANEL
Automatic supply mode
The machine and button feeder are connected and run together. It starts
sewing a button by pressing a pedal, thread trimmer is activated after
sewing a button, and button feeder sets the next button in position
automatically. The machine repeats these operations with this mode.
Mode for individual
This mode is for the machine only. As button feeder will not be activated,
this can be used as a standard button sewing machine.
Mode for small lots
Same as the automatic mode, but parts feeder will not be activated. It
discharges the required amount of buttons in the index and sews buttons
automatically. This is suitable for smaller lots.

øB øC
A
A
B
A
A
B
● Parts shown in parentheses ( ) are optional.
✽Engraved marker
■ MODELS CLASSIFIED BY BUTTON SIZES ■ BUTTON CARRIER
Model name LK-1903A-311/BR35 LK-1903A-312/BR35
Button size For small button
For medium-size button
Outside diameter
that can be adjusted (mm)
ø10 ~ ø15 ø12 ~ ø18
Sewing Length (Y) 0
~ 3.5 0 ~ 4.5
size (mm) Width (X) 0
~ 3.5 0 ~ 4.5
1.7 2.7Thickness
(2.2)(mm)
✽✽
14190458 P MAZ166070B0 J
Button clamp
Right
(MAZ165080B0) H –– ––
jaw lever –– –– –– ––
(combination)
Part No.
–– –– –– ––
14190557 P MAZ166080B0 J
Left
(MAZ165080B0) H –– ––
–– –– –– ––
–– –– –– ––
1.6 1.6
Needle hole A(1.8)
guide (mm)
Bø3.5 ø3.5
Cø1.6 ø2.0
MAZ15501000
Part No. (14149603) MAZ15601000
––
Feed plate MAZ15502000(M8.5) MAZ15602000(M10)
■ SHAPE OF BUTTON
■ OPTIONS
●Magnet wiper
1.2mm or more 1.2mm or less
Shape of
button
Remarks
Applicable button
Thickness of button
should be 1.8~3.5mm.
Inapplicable carrier
Button without
indented part (concavo-
convex shape button)
Button with thin edge
may not be fed by the
button feeder.
Code
B
E
F
G
L
H
M
J
N
K
P
C
Part No.
165-58009
165-87305
165-87404
165-87503
165-87909
165-87602
165-88006
165-87701
165-88105
165-87800
165-88204
165-87107
Distance
B(mm):
Diameter
of set pin
1.2
1.0
1.0
1.0
1.2
1.0
1.2
1.0
1.2
1.0
1.2
1.2
Distance
A(mm):
Distance
between
holes in
button
3.2
2.0
2.2
2.4
2.4
2.6
2.6
2.8
2.8
3.0
3.0
3.8
Code
A
Q
R
S
T
U
V
W
F1
D
X
Z
G1
H1
E1
Part No.
165-57902
165-90507
165-90606
165-88501
165-88600
165-88709
165-88808
165-88907
165-89806
165-87206
165-89004
165-89202
165-89905
165-90705
165-89707
Distance
B(mm):
Diameter
of set pin
1.0
1.0
1.0
1.0
1.2
1.2
1.2
1.2
1.5
1.0
1.2
1.4
Tapered
1.2
1.2
Distance
A(mm):
Distance
between
holes in
button
2.6
2.0
2.2
2.4
2.4
2.6
2.8
3.0
3.0
3.1
3.1
3.1
3.2
3.6
4.0
Standard
Optional
For 2-holed buttonFor 4-holed button
Configuration of button carrier
Applicable model Part No. Description Quantity
40018334 Solenoid for wiper (asm.) 1
SM6041150TP Screw 2
LK-1903A TA1250705RO Rubber plug 1
HX00123000C Cable clip 4
SL4041091SC Screw 4
Model Applicable model Part No. Description
Q123 LK-1903A MAQ123000A0
Q124 LK-1903A/BR35 MAQ124000A0
Z099 LK-1903A 14134050
–– LK-1903A/BR35 ––
When you install magnet wiper on the machine head after factory shipment, a part of belt
cover should be modified.
Button spacer (commonly
used for men's wear and
ladies' wear)
Button rising bar (asm.)
(Attachment and removal
are possible.)
For thick buttons
(Thickness of button
should be 2.5~5.0mm.)