JUKI LK-1903B Series Specifications

LK-1903B Series

Computer-controlled, High-speed, Lockstitch, Button Sewing Machine

Higher productivity.

Excellent seam quality.

LK-1903B Series

The active tension mechanism is provided

with the machine as standard.

LK-1903B-SS

※IP-420U should be ordered as a part.

[

IP-420U : 40144886

]

LK-1903B

Higher productivity and
Excellent seam quality.

LK-1903B-SS-301

STANDARD
LIQUID CRYSTAL PANEL (NEW

)

IP-420U

Operation panel provided
with programmable functions

Higher productivity.

Excellent seam quality.

The machine achieves sewing speed of 2,700sti/min. The machine's
starting, stopping, thread-trimming and automatic presser lifting
speeds have been increased to significantly shorten total cycle time.

Auto-lifter mechanism utilizing a system.

The machine is provided as standard with auto-lifter that uses a
stepping-motor system. This helps reduce operator fatigue.

The sewing starting point can be corrected.

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.

Oil stains are eliminated.

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.

Eco-friendly power saving

An encoder is installed in the pulse motor, thereby achieving
substantially improved power-consumption saving.

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.

Input and edit data while observing the needle-entry points visually.

The operator can easily check the shape of the pattern displayed on the
wide liquid crystal panel.

Make minor adjustments to data quickly and efficiently. Overall use is
easier than ever before.

The memory storage capability of the main body of the sewing machine
has been dramatically enhanced. Now the USB-ready main body of the
sewing machine uses many different kinds of media. In addition to the
Compact Flash card, the main body of the sewing machine is provided as
standard with a USB connector. Now, data can be input/output to/from
various kinds of media (SD (Secure Digital Card), CF (Compact Flash), SM
(Smart Media), FD (floppy disks) etc.) by means of a USB thumb device
and a card reader.

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 99 different cycle sewing patterns, each of
which combines a maximum of 99 different sewing
patterns, can be stored in the memory.

The machine is provided as standard
with the active tension (electronic thread
tension control mechanism).

Since the machine is provided with an
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
separated according to stitching type or
portion of a seam, such as the beginning
part of the seam, base stitched part,
zigzag stitched part and end of the seam
(fastening stitch).

When the operation panel IP-420U is used in combination with the
active tension, the needle thread tension can be set on a
stitch-by-stitch basis. This helps eliminate undesired thread tension
variations at a multi-layered part of a material or with sewing
direction, thereby contributing to upgraded seam quality.

Just a small quantity of clean oil is supplied from the oil tank to the
hook.

It is also possible to change over the stroke of the auto-lifter from a
onestep 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.

Many different sewing patterns.

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-1903B is also able to sew buttons using the same data used
for the LK-1903 (EP-ROM).

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.)

1.5mm
or more

B

A

Model name

LK-1903B-301

φ8~φ

20

φ

1.5 or more

G
F
—
—
G
F
—
—

φ

10~φ15

φ9~φ

10

φ8~φ

9

Button size

Outside diameter
that can be adjusted (mm)

Sewing size (mm)

Length (Y)
Width (X)

Thickness
(mm)

Button clamp
jaw lever
(combination)

Right

Part
No.

Left

A

B
C

Needle hole
guide (mm)

Part No.

Feed plate

φ

2.8

φ

1.6

MAZ15502000 (□8.5)

Button type
Max. sewing speed

For shank button

1,500sti/min

Outside diameter
Diameter of hole in button

Button
configuration

Position of hole
in button

Configuration of
shank

Pattern No.

18, 19, 20, 21, 22

MAZ158070BB

(MAZ158070BA)

—
—

MAZ158080BB

(MAZ158080BA)

—
—

MAZ15801000

(14149900)

—

For extra-small button

Option

For large button

φ

15~φ32

φ

3.5

φ

2.0

MAZ15701000

MAZ15702000 (□12.5)

MAZ157070BB

(MAZ157070BA)

—
—

MAZ157080BB

(MAZ157080BA)

—
—

LK-1903B-302

φ

10~φ20

For medium-size button

φ

3.5

φ

2.0

MAZ15601000

MAZ15602000 (□10)

14149058
(MAZ155070B0)
(MAZ156070B0)

—

14149157
(MAZ155080B0)
(MAZ156080B0)

—

1.7

(2.2)

2.7

(3.2)

2.0
(2.2)
(2.7)

1.7
(2.2)
(2.7)
(0.9)

φ

10~φ20

0~3.5
0~3.5

0~3.0
0~3.0

0~2.5
0~2.5

0~6.5
0~6.5

0~4.5
0~4.5

0~3.5
0~3.5

For small button (accessory)

(φ3.5)
(φ1.6)

1.6

(1.8)

1.41.6(1.6)
(1.8)
(1.1)

(MAZ15501000)

(14149603)

(D2426284Y00)

14148852
(MAZ155070B0)
(MAZ156070B0)
(B25553720A0)

14148951
(MAZ155080B0)
(MAZ156080B0)
(B25573720A0)

Model name Option

※(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.

※

Parts shown in parentheses ( ) are optional.

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

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

3.4 3.4

X

(mm)Y (mm)

Pattern

No.

Stitch
shape

Standard

length

Standard

length

Sewing

thread

Pattern

No.

Stitch
shape

Standard

length

Standard

length

Sewing

thread

(pcs.)

X

(mm)Y (mm)

(pcs.)

18·44

19·45

20

21

22

23·46

24

25

26·47

27

28·48

29

30·49

31

32·50

33

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

0

3.4

3.0

0

3.4

3.4

2.5

Part No. Name of part

Optional part for shank button

14146054
D1401M1YC0A
MAZ160170A0
40015434
14148209
SL6030892TN (2 pcs.)
MAZ16015000
SD0640321TP
40010103
SL6040892TN (2 pcs.)
MAZ16021000
MTQ300B1400

Pick-up device complete

Needle bar (for TQ-1)

Wiper (asm.)

Moving plate link A

Bushing

Screw

Button support link

Hinge screw

Connecting link

Screw

Needle hole guide

Needle TQ×3 #14

K
B
C
—
K
B
C
—

L
B
C

—

L
B
C
—

D
E
—
—
D
E
—
—

A

(mm)

B

(mm)

Min
1
3
5

Max

9
8
7

4
3

—

MODELS CLASSIFIED BY BUTTON SIZESTABLE OF THE SEWING PATTERNS OPTION

SD SM

mini

SD

CF

MS

USB card reader

USB port

φ

B

φ

C

A

: Engraved marker

The IP-420U is a new operation panel configured
with a "input function" not available in standard panel.

Juki Corporation operates an environmental management system
to promote and conduct the following as the company engages in
the research, development, design, sales, distribution,and
maintenance of industrial sewing machines, household sewing
machines, industrial robots, etc., and in the provision of sales and
maintenance services for data entry systems:
(1) The development of products and engineering processes
that are safe to the environment
(2) Green procurement and green purchasing
(3)

Energy conservation (reduction in carbon-dioxide emissions)
(4) Resource saving (reduction of papers purchased, etc.)
(5) Reduction and recycling of waste
(6) Improvement of logistics efficiency (modal shift and
improvement of packaging, packing, etc.)

SPECIFICATIONS

LK-1903B

2,700sti/min

＊

Model name

Max. sewing speed

Type : Round-shaped, flat button
Size : φ8~φ32mm
(standard φ8~φ20mm)

Button size

※
※
※
※

“sti/min” stands for “Stiches per Minute”
CompactFlash™ or CFA specification compatible media.
“CompactFlash™” is a registered trademark of SanDisk Corporation, U.S.A.
Other company names and product names/brand names are trademarks or registered trademarks of the respective companies.

0.1~10mm (0.1mm step)

45.7mm

Max. 13mm

Provided as standard (stepping motor type)

Active tension (electronic thread tension control system)

DP×17(#14)

Standard shuttle hook

Max. 20,000 stitches

50 patterns

200 patterns (for up to 150 patterns, sewing data can be added.)

20~200%(1% step), Pattern enlargement /reduction can be done by increasing /decreasing the stitch length

Internal-organs memory

Provided as standard (up/down method)

Hook: minute-quantity lubrication

JUKI New Defrix Oil No.2 (equivalent to ISO VG32)

Compact AC servomotor (direct-drive system)

250VA

Machine head (include motor) 42kg, Control box 5.6kg

Stitch length
Needle bar stroke
Lift of the work clamp foot
Auto-lifter
Needle thread tension
Needle (at the time of delivery)
Hook
Number of stitches that can be stored in memory
Number of standard patterns
Number of data that can be input
Enlarging/Reducing facility
Memory method
Bobbin thread counter
Lubrication
Lubricating oil
Sewing machine motor
Power consumption
Weight

Machine head

Control box

CodeApplication

S

Standard

CodeWork clamp foot

S

Standard

CodeButton clamp jaw lever

301

For extra-small, small button

302

For medium-size button

LK1903BSS

CodePower supply

E

K

200~240V3-phase

200~240V

N

CE 200~240V

(not provided
with power switch)

Single-phase

CodeOperation panel

SS

Standard panel

IP420U

Option panel

MC670

SEWING MACHINERY BUSINESS UNIT

DECEMBER, 2013 Printed in Japan(C)

2-11-1, TSURUMAKI, TAMA-SHI,

TOKYO

206-8551, JAPAN

PHONE : [phone]
FAX :

(

81

)

42-357-2274

http://www.juki.com

Specifications and appearance are subject to change without prior notice for improvement.
Read the instruction manual before putting the machine into service to ensure safety.
This catalogue prints with environment-friendly soyink on recycle paper.

JUKI ECO PRODUCTS

The LK-1903B Series is an eco-friendly product which complies with
JUKI ECO PRODUCTS standards for protecting the environment

The RoHS Directive is an EU Directive limiting the use of 6 hazardous substances (lead, hexavalent chromium, mercury, cadmium, PBB and PBDE) in electrical and electronic equipment.
The Juki Green Procurement Guideline is the voluntarily established criteria to eliminate not only the aforementioned six substances, but also other ones which also adversely affect the environment.

For details of JUKI ECO PRODUCTS, refer to: http://www.juki.co.jp/eco_e/index.html

WHEN YOU PLACE ORDERS

Please note when placing orders, that the model name should be written as follows:

To order, please contact your nearest JUKI distributor.

This sewing machine reduces power consumption by 15% as compared with the conventional models.

The sewing machine complies with the "Juki Group Green Procurement Guidelines" on the use of
hazardous substances, which is stricter than other restrictions, such as those of the RoHS Directive.