JUKI LK-1900B series User manual

LK-1900B Series
Computer-controlled, High-speed, Bartacking Machine
Higher productivity.
Low-noise and low-vibration.
LK-1900B-SS
LK-1900B Series
The machine is provided with an active tension mechanism
which enables the electronic control of "stitching."

1 2
✽Presser foot for vertical bartacking is supplied with the unit as an accessory.
Higher productivity.
The machine achieves sewing speed of 3,200sti/min. The
machine's starting, stopping, thread-trimming and automatic
presser lifting speeds have been increased to significantly
shorten total cycle time.
Excellent workability
and operability.
(Low-noise and low-vibration)
The direct-drive head (with no belt), which is directly connected
to a compact AC servomotor, achieves outstanding. This head
helps create a comfortable working environment with reduced
vibration and noise.
The arm section of the machine head is fitted with a hand
pulley. This allows the operator to visually check the needle
entry points.
LK-1900B Series
Many different models are prepared according to the type of materials.
S type (Bartacking pocket lip of suits)H type (Bartacking crotch of jeans)F type (Attaching the shoulder straps to brassier)M type (Bartacking shoulder of running shirt)
Excellent seam quality.
Eco-friendly power saving
An encoder is installed in the pulse motor, thereby achieving
substantially improved power-consumption saving.
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.)
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 work clamp foot lift can be set to a maximum of 13mm.
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 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.
Just a small quantity of clean oil is supplied from the oil tank to the
hook.
Many different sewing patterns.
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.
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-1900B is also able to sew buttons using the same data
used for the LK-1900 (EP-ROM).
Active tension
Higher productivity.
Low-noise and low-vibration.
LK-1900B-SS
The LK-1900B model comes in five different subclass models, such as S type (standard), H type (for heavy-weight materials), F type (for foundation),
M type (for knits and knitted materials) and W type (with a large shuttle hook for heavy-weight materials), to offer a choice according to any application.
The needle's penetrating force into the material has been increased. This provides an improved responsiveness to heavy-weight materials for the H type machine.
The W type has adopted a large shuttle hook, which reduces the frequency of bobbin-thread changing to enable highly efficient sewing work.

✽A finger guard is included in the presser foot.
Provided as
standard
LK-1902B-SS
LK-1902B-HS
Option
Option
For large size
For extra
large size
LK-1901B LK-1902B
3 4
Computer-controlled,
High-speed Bartacking Machine for Eyelet Buttonholes
LK-1901B-SS (Table stand is optionally available.) LK-1902B-SS (Table stand is optionally available.)
Computer-controlled,
High-speed Belt-loop-attaching Machine
STANDARD LIQUID CRYSTAL PANEL (NEW)IP-420U
USB card reader
USB port
SD SM
mini
SD CF MS
17
2
7
2.4
7
27
2.8
37.4
10
37
2.8
27.4
10
24.8
2.4
7
37
41.5
Work clamp
foot Feed plate Number of pattern
13544465 14143002
17
18
13545660 13545504 19
20
21
13545801
22
13547161
13547005
22
WORK CLAMP FOOT AND FEED PLATE
FOR LK-1902B (for belt-loop attaching)
The sewing pattern best suited to the sewing product
to be bartacked can be selected by single-key operation.
The machine is provided as standard with six different linear bartacking
patterns. Since the sewing size can be easily changed, the optimal number
of stitches and sewing size can be speedily selected according to the
belt-loop width. If the normally used patterns are assigned to the patterns
keys, a desired pattern can be called up or changed with single-key
operation.
The machine head has been designed
with an emphasis on operability.
With its broadly curved feed bracket (presser arm), the machine permits
easy placement of the material to be sewn. The slimly shaped bed and
head design that allows free space under the arm demonstrates greater
operability in handling materials on the machine and continuous processes.
These features contribute substantially to increased productivity in belt-loop
attachment processes.
The machine ensures high-quality bartacks on eyelet buttonholes.
The machine is provided with a material-drawing mechanism which draws the right and left parallel portions of an eyelet
buttonhole near to one another.
The machine performs bartacking with the right and left parallel portions of the eyelet buttonhole drawn near to one another
after the buttonhole is clamped under the work clamp foot, thereby finishing highly durable and well-tensed eyelet buttonholes.
The sewing pattern best suited to the sewing product
to be bartacked can be selected by single-key operation.
Three different sewing patterns are prepared to enable easy switchover of sewing sizes. If the sewing patterns are assigned to
the pattern keys on the operation panel, the sewing patterns can be called up or changed with single-key operation.
The machine sews the most optimally suited bartacks on eyelet buttonholes on the front bodies of garments and straight
buttonholes that differ in stitch number and size on jacket lapels, thereby improving the finished quality of sewing products.
The material drawing mechanism can be switched to ON/OFF.
The material drawing amount can be adjusted to 3mm at maximum. The material drawing mechanism can be switched ON/OFF
in accordance with the setting of the memory switch. With these features, the material drawing mechanism can be used with
greater flexibility.
※IP-420U should be ordered as a part.
[IP-420U : 40144886]
Operation panel provided with programmable functions
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 IP-420U is a new operation panel configured
with a "input function" not available in standard panel.

5 6
ø12
41 29 20 2.5
12
47
48
49
50
21
9, 10
11
(Top)
(Bottom)
(Top)
(Bottom)
(Top)
(Bottom)
(Top)
(Bottom)
(Top)
(Bottom)
(Top)
(Bottom)
(Top)
(Bottom)
(Top)
(Bottom)
(Note) 1. Sewing size shows the dimensions when the scale rate is 100%.
2. Refer the No. of work clamp foot to the separate table of work clamp foot.
3. For No. 22, modify the work clamp foot blank for use.
4. Use the patterns with ✽marks for sewing denim.
12.0 16
2 2.0 10
42
✽
✽
2.5 16
1
3
4
4
28
36
56
8
5
1
2
3
1
2
3
No. Stitch diagram
Length- wise Cross- wise
Sewing size
(mm)
TABLE OF THE STANDARD PATTERNS
17 010
1
2
3
28
36
18
19
010
1
2
3
025
6
7
20 0 25
6
7
4121 0 25
6
7
2823 20 4.0
1827 20 0
2830 20 0
29 20 0
21
28 10 0
3624 20 4.0
4225 20 4.0
5626 20 4.0
4422 0 35 (Note 3)
52
31 710 13
63
32 712 13
42 39 25 2.5
43 45 25 2.5
44 58 30 2.5
45 75 30 2.5
46 42 30 2.5
91
99
148
164
6
9037 3 24
7
24
33 610 13
31
34 612 13
4835 10 7 14
52838 2 8
16 ø8 15
2839
4840
4836 10 7 14
5 2.0 10
1
2
3
7 2.0 10
1
2
3
3.0 24
6
7
✽2.5 16
1
6
4
✽2.5 16
1
8
4
✽3.0 24
6
9
7
64
✽3.0 24
6
10
7
21 2.5 611
14 2.0 814
21 2.0 815
28 2.5 612
36 2.5 613
28 2.0 816
Number of stitches
(Note 2)
No. of work clamp foot
No. Stitch diagram
Length- wise Cross- wise
Sewing size
(mm)
Number of stitches
(Note 2)
No. of work clamp foot
No. Stitch diagram
Length- wise Cross- wise
Sewing size
(mm)
Number of stitches
(Note 2)
No. of work clamp foot
No. Stitch diagram
Length- wise Cross- wise
Sewing size
(mm)
Number of stitches
(Note 2)
No. of work clamp foot
Large bartackingSmall bartacking
Large bartacking
Linear bartackingLengthwise bartackingLengthwise linear bartacking
Round bartacking
Radial tacking
Knit goods bartacking Large size bartacking
Semilunar bartacking
Lengthwise bartacking

7 8
40
32.84.5
20
27
40
32.3
5.1
21
27
40
33.4
3.4
10
22
40
32.8
4.5
10
22
50
12
24.123
5.6
20
54
2
17.5
14.5
25
29
18.5
15
25
37.3
5.4
27.4
17.5
24
40
15
25
17.5
14.5
25
29
4.6
20
5.4
21.2
4.8
11.4
27
35
40.5
5 32.6
23
5.6
24
22
2.4
60
23.533
4
13.6
50
30
16.6
45
ø12
29
12
45
ø10
30
10
45
ø14
28
14
41
28
14
23
9
ø12.4 ø10.4
ø14 . 4
9.4
14.4
12345678
SFFHMSHS
13518659 (asm.) 13548557 (asm.) 13542964 (asm.) 13548151 (asm.) 13542451 (asm.)
14116107 14116404 14116800 14116305 14116206 13548003 13554803 14116602
(without knurl)
No. of work
clamp foot
Work
clamp
foot
Feed plate
Finger guard✽
Application
code
heavy-weight
materials
Installed on
machine head
—
—
—
—
foundation
knitted materials
with large hook,
heavy-weight materials
standard
(without knurl)
S
H
F
M
W
(
(
(
(
(
)
)
)
)
)
26224204 13548300 26224204
Option
—
—
—
—
Option
—
—
—
—
Option★
✽Install a finger guard suitable for each work clamp foot when replacing the work clamp foot.
—
—
—
—
Option★
—
—
—
—
Option
—
—
—
—
Installed on
machine head★
—
—
—
—
Supplied with
machine as accessory
★
—
—
—
—
Installed on
machine head
—
—
—
—
—
—
Installed on
machine head
Installed on
machine head
—
9 10111213141516
FFFHSSSS
13571955 (asm.) 13561360 (asm.)
14137509
(Right)
14137608
(Left)
40021871
(Right)
40021872
(Left)
40021874
(Right)
40021875
(Left)
40021877
(Right)
40021878
(Left)
40021880
(Right)
40021881
(Left)
14116503 14116909 14116701 14137707 40021873 40021876 40021879 40021882
(without knurl) (without knurl) (without knurl) (without knurl) (with knurl) (with knurl) (with knurl) (with knurl)
14135305 26224204
Option
—
—
—
—
Option
—
—
—
—
—
—
Option
—
—
—
—
Option
—
—
—
—
Option
—
—
—
—
Option
—
—
No. of work
clamp foot
Work
clamp
foot
Feed plate
Finger guard＊
Application
code
heavy-weight
materials
foundation
knitted materials
with large hook,
heavy-weight materials
standard
S
H
F
M
W
(
(
(
(
(
)
)
)
)
)
TABLE OF THE WORK CLAMP FOOT OPTION
Simple work clamp kit
Foot pedal for standing work (optional)
for the LK-1900B Series
The lever for lifting the work clamp can be independently slid
back and forth.
The machine parts can be adjusted and replaced entirely by
hand without screwdrivers or others tools. Changing parts is
now a "clean-hands" procedure.
Pedal switch conversion cable asm.
[Part No. M90125900A0]
Pedal switch conversion cable asm.
[Part No. M90135900A0]
★For the foundation type (F-type) sewing machine for the European market, the work clamp foot No. 2 is installed on the machine head and the work clamp foot No. 9 is supplied with the
machine as an accessory (packed together) (note that the work clamp feet No. 3 and No. 10 are not supplied with the machine).
Conventionally, the front plate has to be removed to change the work clamp.
With the new work clamp kit, the work clamp can be changed without
removing the plate.
Simple work
clamp kit
Part No.: 40057279
✽The work clamp cover plates (right and left) are not
included in the kit.
2-pedal unit for standing work✽
[Part No. M85205800A0]
✽To connect the cable asm. to the electrical box,
conversion cable (separately available) is necessary.
✽To connect the cable asm. to the electrical box,
conversion cable (separately available) is necessary.
PK-57✽
[Part No. GPK570010B0]

TABLE OF THE OPTIONAL PARTS
3,200sti/min✽2,700sti/min✽
Standard shuttle hook Large shuttle hook
20~200% (1% step), Pattern enlargement/reduction
can be done by increasing/decreasing the stitch length
Application Standard Standard For heavy-weight
materials
Lift of the work clamp foot
Applicable pattern number 11, 12, 13
17, 18 (19, 20, 21, 22*)
*This device has been factory-set to
“ invoking prohibited ”
status at the time of delivery.
Number of data that can be input 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
✽
✽
✽
✽
“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. 10
SPECIFICATIONS
LK-1900B-WSLK-1900B-MSLK-1900B-FSLK-1900B-HSLK-1900B-SS
Application Standard For heavy-weight
materials For foundation For knits and knitted materials
With large hook
for heavy-weight
materials
Model name
DP×5 (#14) DP×17 (#21) DP×5 (#11) DP×5 (#11) DP×17 (#21)
30mm (L) × 40mm (W)
0.1~10mm (0.1mm step)
41.2mm
Standard 14mm (17mm when the reverse-rotation needle-up function)
Provided as standard (stepping motor type)
Active tension (electronic thread tension control system)
Max. 20,000 stitches
LK-1902B-HSLK-1902B-SSLK-1901B-SS
Model name
DP×5 (#14) DP×5 (#14) DP×17 (#21)
Eyelet buttonhole
bartacking machine
Belt-loop attaching machine
9
øA
øB
A
B
A
B
A
B
SM8040302TP
L
A
B
SM8040302TP
L
77
2422
14 14
36
Part name Type Part No.
Feed plate blank Without knurl/with plating
With knurl/with plating
Without knurl/stainless steel✽
Without knurl/with plating
Without knurl/without plating
Without knurl/stainless steel✽
With knurl/with plating
With knurl/without plating
Sewing area 20×40
Sewing area 20×40
Sewing area 20×40
Sewing area 30×40
Sewing area 30×40
Sewing area 30×40
Sewing area 30×40
Sewing area 30×40
14120109
14120307
14120505
40021855
40021856
40021857
40021858
40021859
Work clamp foot
face plate (asm.) Face plate for presser blank 14121263
Presser blank
With knurl/with plating (right)
With knurl/with plating (left)
40021869
40021870
A=66.5 B=43 For lengthwise bartacking 13573407
t=3.2
Part name Feature
Type Part No.
With knurl/with plating (right)
With knurl/with plating (left)
With knurl/with plating (right)
With knurl/with plating (left)
With knurl/without plating (right)
With knurl/without plating (left)
Sewing area 20×40
Sewing area 20×40
Sewing area 30×40
Sewing area 30×40
Sewing area 30×40
Sewing area 30×40
14121701
14121800
40021851
40021852
40021853
40021854
A=1.6 B=2.6 With relief slit Standard type
A=1.6 B=2.0 Without relief slit F and M types
A=2.3 B=4.0 Without relief slit for heavy-weight material
A=2.7 B=3.7 Without relief slit for extra heavy-weight material
B2426280000
D2426282C00
14109607
D2426MMCK00
Work clamp
foot blank
A=56.5 B=64
A=59 B=74 For extra-large bartacking
13533104
13548300
Finger guard (1)
Needle hole guide
Finger guard (2)
A=21.5 B=35.5 L=67 For lengthwise bartacking 14135305
Finger guard (3)
A=21.5 B=35.5 L=58.5 For specially ordered work clamp 14120000
Finger guard (4)
Silicon oil pipe The silicon oil pipe are the parts which cool the heat of a needle.
Silicon oil pipe
Rubber plug
Oil felt
Silicon oil thread guide
Screw 11/64 - 40 L5
Silicon oil pouring hole
40040910
TA1050504R0
13501705
B1127280000
SS4110515SP
13501408
t=1.2
✽Stainless steel t=0.5
Max. sewing speed
Sewing area
Stitch length
Needle bar stroke
Lift of the work clamp foot
Auto-lifter
Needle thread tension
Needle (at the time of delivery)
Hook
3,000sti/min✽
30mm (L) × 40mm (W)
0.1~10mm
41.2mm
Standard 14mm
(by using the reverse-rotation needle-up function 17mm)
Max. sewing speed
Sewing area
Stitch length
Needle bar stroke
Internal-organs memory
Provided as standard (up/down method)
Hook: minute-quantity lubrication
JUKI New Defrix Oil No.2 (equivalent to ISO VG32)
450W compact AC servomotor (direct-drive system)
250VA
Machine head (include motor) 42kg, Control box 5.6kg
Memory method
Material drawing amount
Bobbin thread counter
Lubrication
Lubricating oil
Sewing machine motor
Power consumption
Weight
Provided as standard (stepping motor type)
Active tension (electronic thread tension control mechanism)
Standard shuttle hook
Auto-lifter
Needle thread tension
Needle (at the time of delivery)
Hook
Max. 3mm —
Enlarging/Reducing facility
Max. 20,000 stitches
Number of stitches
that can be stored in memory
50 patterns
200 patterns (for up to 150 patterns, sewing data can be added.)
Number of standard patterns
Number of data that can be input
Internal-organs memory
Provided as standard (up/down method)
Hook: minute-quantity lubrication
JUKI New Defrix Oil No.2 (equivalent to ISO VG32)
450W compact AC servomotor (direct-drive system)
250VA
Machine head (include motor) 42kg, Control box 5.6kg
Memory method
Bobbin thread counter
Lubrication
Lubricating oil
Sewing machine motor
Power consumption
Weight
Number of stitches
that can be stored in memory
Enlarging/Reducing facility

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.)
SEWING MACHINERY BUSINESS UNIT
DECEMBER, 2013 Printed in Japan(C)
2-11-1, TSURUMAKI, TAMA-SHI,
TOKYO 206-8551, JAPAN
PHONE : [phone]
FAX : [phone]
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.
Machine head Control box
CodeWork clamp foot
S
Standard
CodeAttachment
000
Not provided
CodeWork clamp foot
S
Standard
CodeAttachment
000
Not provided
CodeApplication
S
Standard
H
For heavy-weight materials
F
For foundation
M
For knits and knitted materials
W
With large hook
for heavy-weight materials
CodeOperation panel
SS
Standard panel
IP420U
Option panel
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.
LK1900B S000
CodeApplication
S
Standard
H
For heavy-weight materials
CodePower supply
E
3-phase
K
N
Single-phase
200~240V
200~240V
CE 200~240V
(not provided with
power switch)
CodeWork clamp foot
S
Standard
CodeAttachment
000
Not provided
LK1902B S000
CodeApplication
S
Standard
LK1901BSS000
MC670
Bartacking
Eyelet buttonhole bartacking
Belt-loop attaching
JUKI ECO PRODUCTS The LK-1900B 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
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.