JUKI LK-1900A-SS User manual

LK-1900A-SS (Table stand is optionally available.)
The machine is provided with an active tension mechanism
which enables the electronic control of "stitching."
Computer-controlled, High-speed, Bartacking Machine
LK-1900A SERIES
LK-1900A SERIES

LK-1900A-SS (Table stand is optionally available.)
LK-1900A SERIES
LK-1900A SERIES
The machine runs at 3,000rpm, faster than
any other sewing machine ever made.
The proven computer-controlled
bartacking machine
has been dramatically
evolved to be an
easier-to-use machine.
The machine runs at 3,000rpm, faster than
any other sewing machine ever made.
The proven computer-controlled
bartacking machine
has been dramatically
evolved to be an
easier-to-use machine.
The machine runs at 3,000rpm, faster than
any other sewing machine ever made.
The proven computer-controlled
bartacking machine
has been dramatically
evolved to be an
easier-to-use machine.
Active tension
The machine runs at 3,000rpm, faster than any other
sewing machine ever made.
In addition to the high-speed sewing performance,
the machine's starting, stopping, thread-trimming and
automatic presser lifting speeds have been increased
to significantly shorten total cycle time (reduced
approximately 30% compared to our predecessor model:
For 42-stitch large bartacks).
Higher productivity.
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-410B 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 the active
tension (electronic thread tension control mechanism).
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 just clean oil is supplied from
the oil tank to the hook.
Oil stains are eliminated.Wider sewing area and
many different sewing patterns.
The machine comes with a newly developed needle
thread grasping mechanism. The mechanism prevents
thread from slipping off from the needle eyelet at the
beginning of sewing, from tangling on the wrong side
of the material and also being stained during sewing.
The thread trimming mechanism has been further
improved to shorten the length of thread remaining
on the wrong side of the material after thread trimming.
Excellent seam quality.
With its 30mm (length) by 40mm (width) sewing area,
the machine can sew many different shapes of bartacks.
The machine is provided as standard with as many as
50 different types of sewing patterns including semilunar
bartacking, round bartacking, radial tacking as well as
conventional bartacks.
The LK-1900A is also able to sew bartacks using the
same data used for the LK-1900 (EP-ROM).

The LK-1900A 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.
The machine is provided as standard with an auto-lifter that uses a new
stepping-motor system.
A wide choice of subclass models of LK-1900A
Excellent workability and operability.
The direct-drive head (with no belt), which is directly connected to a compact AC servomotor, achieves outstanding
responsiveness and improved stop accuracy. 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.
The sewing starting point can be corrected.
The sewing starting point can be shifted in the X/Y direction. This enables the correction of a sewing pattern in
accordance with the presser foot configuration.
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 presser foot lift can be set to a maximum of 17mm by using the reverse-rotation needle-up function in combination
with the auto lifter mechanism.
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 )
✽Presser foot for vertical bartacking is supplied with
the unit as an accessory.

17
2
7
2.4
7
2.4
2.8
7
27
37
37.4
10
37
2.8
27.4
10
24.8
41.5
Computer-controlled, High-speed Bartacking Machine for Eyelet Buttonholes
LK-1901A
LK-1901A-SS (Table stand is optionally available.)
Work clamp foot Feed plate Number of pattern
Provided as 13544465 14143002
standard 17
LK-1902A-SS 18
LK-1902A-HS
13545660 13545504
Option 19
For large size 20
21
13545801
22
13547161
13547005
22
■ WORK CLAMP FOOT AND FEED PLATE FOR LK-1902A
(for belt-loop attaching)
✽A finger guard is included in the presser foot.
Computer-controlled, High-speed Belt-loop-attaching Machine
LK-1902A
LK-1902A-SS (Table stand is optionally available.)
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 machine ensures high-quality bartacks on
eyelet buttonholes.
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 sewing pattern best suited to the sewing product
to be bartacked can be selected by single-key operation.
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 head has been designed
with an emphasis on operability.
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 sewing pattern best suited to the sewing product
to be bartacked can be selected by single-key operation.
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.
The material drawing mechanism can be
switched to ON/OFF.
Option
For extra
large size

LK-1900A-SS/IP-410B
(Table stand is optionally available.)
Functional settings, such as pattern numbers,
enlargement/reduction scales, swing speeds and needle
thread tensions can be established through the operation
panel with ease.
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.
The color LCD unit displays sewing data such as stitch shape, needle thread
tension, enlargement/reduction ratio, maximum sewing speed and the
number of stitches at a glance. For data edit operations, detailed data
is shown on the screen simply by lightly pressing the display icon, thus
contributing to dramatically enhanced efficiency.
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.
Sewing data created with the IP-410B can be stored in the memory of
the main body of the sewing machine. The memory capacity is a maximum
of 200 different patterns (max. 20,000 stitches). When external media
(CompactFlash) is used, as many as 999 different patterns (max. 20,000
stitches/pattern and the max. number of stitches that can be stored in
the memory is 24,000,000) can be stored.
The data storing capacity of the main body of the sewing
machine has been substantially enhanced.
STANDARD PANEL
IP-410B Operation panel provided with programmable functions
The IP-410B is a new operation panel configured with a "input function " not available in conventional panels.

■ TABLE OF THE STANDARD PATTERNS
1 2.0 16
2 2.0 10
42
✽
2.5 16 1 34
✽
3.0 24 6 47
5 2.0 10
28
✽
2.5 16 1 64
7 2.0 10
36
✽
2.5 16 1 84
✽
56 3.0 24 6 97
✽
64 3.0 24 6 10 7
11 21 2.5 6
12 28 2.5 6 8
13 36 2.5 6
14 14 2.0 8
15 21 2.0 8 5
16 28 2.0 8
17 21 0 10
18 0 10
28
19 0 25 6
7
20 36 0 25 6
7
21 41 0 25 6
7
22 44 0 35 (Note 3)
23 28 20 4.0
24 36 20 4.0
9, 10
25 42 20 4.0
26 56 20 4.0
27 18 20 0
28 10 0
21 11
29 20 0
30 28 20 0
Large bartacking
Linear bartackingLengthwise bartackingLengthwise linear bartacking
Small bartackingLarge bartacking
(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.
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
No. Stitch diagram
Number of
stitches
Sewing size
(mm)
Length-
wise Cross- wise
(Note 2)
No. of
work
clamp
foot
No. Stitch diagram
Number of
stitches
Sewing size
(mm)
Length-
wise Cross- wise
(Note 2)
No. of
work
clamp
foot

31 52 7 10 13
32 63 7 12 13
33 24 6 10 13
34 31 6 12 13
35 48 10 7 14
36 48 10 7 14
37 90 3 24
6
7
38 28 2 8 5
39 28
ø12 16
40 48
41 29 20 2.5
42 39 25 2.5
43 45 25 2.5
12
44 58 30 2.5
45 75 30 2.5
46 42 30 2.5
47 91
ø8 15
48 99
49 148
50 164
Round bartacking
Radial tacking
Knit goods bartacking
Large size bartacking
Semilunar bartacking
Lengthwise bartacking
No. Stitch diagram
Number of
stitches
Sewing size
(mm)
Length-
wise Cross- wise
(Note 2)
No. of
work
clamp
foot
No. Stitch diagram
Number of
stitches
Sewing size
(mm)
Length-
wise Cross- wise
(Note 2)
No. of
work
clamp
foot

40
17.5
14.5
32.84.5
20
27
40
32.35.1
21
27
40
33.43.4
10
22
40
32.84.5
50
20
54
10
22
12
24.123
5.6 2
25
29
18.5
15
5.4
25
37.3 27.4
17.5
40
23
24
24
15 5.6
25 22
17.5
14.5
4.6
5.4
25
29 20 21.2
4.8
11.4
27
35
40.5
5 32.6
2.4
60
23.533
4
13.6
50
30
16.6
41
45
¿12
28
14
23
9
29
12
45
¿10
30
10
45
¿14
28
14
9.4
¿12.4 ¿10.4 ¿14.4
14.4
■ TABLE OF THE WORK CLAMP FOOT
Standard
accessory for
S (standard)
type machine
head.
Option
★(3) Option Option Option
Standard
accessory for
F (foundation)
type machine
head.
★(1)
For lengthwise
bartacking
(packed together
with accessories
supplied with
F-type machine
head)
★(1)
Standard
accessory for
H (heavy-weight
material) and W (with
large hook for heavy-
weight materials)
type machine head.
Standard
accessory for
M (knit and
knitting fabric)
type machine
head.
For JE: ★(1) Option
★(2) Packed together with accessories supplied with F-type machine head.
★(3) Standard accessory for F (foundation) type machine head.
✽Install a finger guard suitable for each work clamp foot when replacing the work clamp foot.
No. of work
clamp foot 12345678
13518659 (asm.) 13548557 (asm.) 13542964 (asm.) 13548151 (asm.) 13542451 (asm.)
Work
clamp
foot
14116107 14116404 14116800 14116305 14116206 13548003 13554803 14116602
(without knurl) (without knurl)
Feed plate
Application
code
SFFHMSHS
Finger guard
✽13533104 13548300 13533104
Remarks
No. of work
clamp foot 910111213141516
13571955 (asm.) 13561360 (asm.)
14137509 (Right) 40021871 (Right) 40021874 (Right) 40021877 (Right) 40021880 (Right)
14137608 (Left) 40021872 (Left) 40021875 (Left) 40021878 (Left) 40021881 (Left)
Work
clamp
foot
14116503 14116909 14116701 14137707 40021873 40021876 40021879 40021882
(without knurl) (without knurl) (without knurl) (without knurl) (with knurl) (with knurl) (with knurl) (with knurl)
Feed plate
Application
code
FFFFSSSS
Finger guard
✽14135305 13533104
Remarks Option Option Option Option Option Option Option
★(2)

･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.
●2-pedal unit for standing work✽
[Part No. M85205800A0]
✽To connect the cable asm. to the electrical box,
conversion cable (separately available) is necessary.
●Pedal switch conversion cable asm.
[Part No. M90125900A0]
●PK-57✽
[Part No. GPK570010B0]
for the LK-1900A Series
Simple work clamp kit
Simple work clamp kitSimple work clamp kit
●Simple work clamp kit
Part No.: 40057279
✽The work clamp cover plates (right and left) are not
included in the kit.
･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.
■ OPTION
●Foot pedal for standing work
(optional)

øA
øB
A
B
A
B
A
B
SM8040302TP
L
A
B
SM8040302TP
L
77
2422
14 14
36
LK1900A S000
■ TABLE OF THE OPTIONAL PARTS
■ WHEN YOU PLACE ORDERS
●Bartacking
●Eyelet buttonhole bartacking
●Belt-loop attaching
MC596
[Machine head] [Control box]
Application Code
Standard S
For heavy-weight materials H
For foundation F
For knits and knitted
materials M
With large hook
for heavy-weight materials W
Power supply Code
3-phase 200~240V E
Single-phase 200~240V K
CE 200~240V
(not provided with
power switch) N
Attachment Code
Not provided 000
Work clamp foot Code
Standard S
LK1902A S000
Application Code
Standard S
For heavy-weight materials H
Attachment Code
Not provided 000
Work clamp foot Code
Standard S
LK1901ASS000
Application Code
Standard SAttachment Code Not provided 000
Work clamp foot Code
Standard S
Please note when placing orders, that the model name should be written as follows:
●To order, please contact your nearest JUKI distributor.
Operation panel Code
Standard panel SS
IP panel for LK-1900A IP410B
(CompactFlash)
Part name Type Part No.
Feed plate blank Without knurl/with plating Sewing area 20×40 14120109
With knurl/with plating Sewing area 20×40 14120307
Without knurl/stainless steel✽Sewing area 20×40 14120505
Without knurl/with plating Sewing area 30×40 40021855
Without knurl/without plating Sewing area 30×40 40021856
Without knurl/stainless steel✽Sewing area 30×40 40021857
With knurl/with plating Sewing area 30×40 40021858
With knurl/without plating Sewing area 30×40 40021859
Work clamp foot
face plate (asm.) Face plate for presser blank 14121263
Presser blank With knurl/with plating (right) Sewing area 20×40 14121701
With knurl/with plating (left) Sewing area 20×40 14121800
With knurl/with plating (right) Sewing area 30×40 40021851
With knurl/with plating (left) Sewing area 30×40 40021852
With knurl/without plating (right) Sewing area 30×40 40021853
With knurl/without plating (left) Sewing area 30×40 40021854
Work clamp foot blank With knurl/with plating (right) 40021869
With knurl/with plating (left) 40021870
Needle hole guide A=1.6 B=2.6 With relief slit Standard type B2426280000
A=1.6 B=2.0 Without relief slit F and M types D2426282C00
A=2.3 B=4.0 Without relief slit for heavy-weight material 14109607
A=2.7 B=3.7 Without relief slit for extra heavy-weight material D2426MMCK00
Finger guard (1) A=56.5 B=64 13533104
A=59 B=74 For extra-large bartacking 13548300
Finger guard (2) A=66.5 B=43 For lengthwise bartacking 13573407
Finger guard (3) A=21.5 B=35.5 L=67 For lengthwise bartacking 14135305
Finger guard (4) A=21.5 B=35.5 L=58.5 For specially ordered work clamp 14120000
t=1.2
✽Stainless steel t=0.5
t=3.2

■ SPECIFICATIONS
Model name LK-1900A-SS LK-1900A-HS LK-1900A-FS LK-1900A-MS LK-1900A-WS
Application Standard For heavy-weight For foundation For knits and With large hook
materials knitted materials for heavy-weight
materials
Max. sewing speed 3,000rpm 2,700rpm
Sewing area 30mm (L)×40mm (W)
Stitch length 0.1~10mm (0.1mm step)
Needle bar stroke 41.2mm
Lift of the work clamp foot Standard 14mm (17mm when the reverse-rotation needle-up function)
Auto-lifter Provided as standard (stepping motor type)
Needle thread tension Active tension (electronic thread tension control system)
Needle (at the time of delivery) DP×5 (#14) DP×17 (#21) DP×5 (#11) DP×5 (#11) DP×17 (#21)
Hook Standard shuttle hook Large shuttle hook
Number of stitches
that can be stored in memory
Max. 20,000 stitches
Number of standard patterns 50 patterns
Number of data
that can be input 200 patterns (for up to 150 patterns, sewing data can be added.)
Enlarging/Reducing facility 20~200% (1% step), Pattern enlargement/reduction can be done by increasing/decreasing the stitch length
Memory medium EEP-ROM, EP-ROM
Bobbin thread counter Provided as standard (up/down method)
Lubrication Hook: minute-quantity lubrication
Lubricating oil JUKI New Defrix Oil No.2 (equivalent to ISO VG32)
Sewing machine motor 450W compact AC servomotor (direct-drive system)
Power consumption 320W
Weight Machine head (include motor) 42kg, Control box 16.5kg
Model name
Eyelet buttonhole
bartacking machine
Belt-loop attaching machine
LK-1901A-SS LK-1902A-SS LK-1902A-HS
Application Standard Standard For heavy-weight
materials
Max. sewing speed 3,000rpm
Sewing area 30mm (L)×40mm (W)
Stitch length 0.1~10mm
Needle bar stroke 41.2mm
Lift of the work clamp foot Standard 14mm
(by using the reverse-rotation needle-up function 17mm)
Auto-lifter Provided as standard (stepping motor type)
Needle thread tension Active tension (electronic thread tension control mechanism)
Needle (at the time of delivery) DP×5 (#16) DP×5 (#16) DP×17 (#21)
Hook Standard shuttle hook
Number of stitches
that can be stored in memory
Max. 20,000 stitches
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.)
Enlarging/Reducing facility
20~200% (1% step), Pattern enlargement/
reduction can be done by increasing/decreasing the stitch length
Memory medium EEP-ROM, EP-ROM
Material drawing amount Max. 3mm 
Bobbin thread counter Provided as standard (up/down method)
Lubrication Hook: minute-quantity lubrication
Lubricating oil JUKI New Defrix Oil No.2 (equivalent to ISO VG32)
Sewing machine motor 450W compact AC servomotor (direct-drive system)
Power consumption 320W
Weight Machine head (include motor) 42kg, Control box 16.5kg
✽CompactFlashor CFA specification compatible media.
✽“CompactFlash” is a registered trademark of SanDisk Corporation, U.S.A.

MARKETING & SALES H.Q.
✽ 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 soy ink on recycle paper.
APRIL, 2007 Printed in Japan(A)
8-2-1 , KOKURYO-CHO, CHOFU-SHI,
TOKYO
182-8655 , JAPAN
PHONE :
(81)3-3480-2357, 2358
FAX :
(81)3-3430-4909
http://www.juki.com