LBH-1790A Series
LBH-1790A Series
Computer-controlled, High-speed, Buttonholing Machine
The world's first
LBH-1790AB (Shorter-thread remaining functions)
LBH-1790A
LBH-1795A (120mm presser type)
LBH-1796A (220mm presser type)
The LBH-1790A Series follows
the world's highest sewing speed and
dry-head mechanism.
LBH-1790AS
(Table stand is optionally available.)
LBH-1796A
Buttonholing machine with a 220mm work
clamp which supports the simplified indexer
function has been added to the family of
buttonholing sewing machines.
LBH-1796AS
(table stand and parts for indexer are optionally available)
LBH-1790A Series
Excellent seam quality
by Digitization
The LBH-1790A Series follows the world's highest sewing speed and dry-head mechanism
of its predecessor model. In addition, this machine comes with the latest model
operation panel which is installed with a USB port.
Furthermore, all drive mechanisms have been digitalized to
manage each sewing pattern individually.
JUKI's unique active tension (Electronic thread tension control system).
Needle thread tension for sewing parallel and bartacking sections of buttonholes can
be separately controlled through the operation panel and stored in memory according
to various sewing conditions (e.g., type of thread, type of material and sewing speed).
The machine is able to change the needle thread tensions at the parallel and
bartacking sections of the buttonhole, to produce a beautiful buttonhole shape. This
capability helps greatly in preventing thread breakage.
Needle thread tension is activated at the beginning and end of sewing. This
prevents unthreading of the needle thread, and thread fraying that is likely to occur
at the beginning of sewing.
Needle thread tensioner
Solenoid
Thread tension for basting stitching can be specified separately.
Excellent operability
by Digitization
Higher productivity
Operator-friendly environment
The maximum sewing speed is 4,200 sti/min., and the jump speed
is 200 mm/s. The cycle time has been further reduced for continuous
sewing.
Operation with reduced noise is ensured by the adoption of the
direct-drive motor.
The illuminance of the LED light is adjustable and is located on the
underside of the arm jaw. It is provided as standard for all models of
the LBH-1790A Series.
The sewing product can further be placed on the machine easily by
installing the auxiliary table (standard accessory). In addition, the
needle entry is located in the center of the bed, promising easier
positioning of the sewing product.
Cycle sewing and continuous sewing.
Cycle sewing
Twenty different programs can be registered, and as many as 30
different patterns can be stored in one program.
Continuous sewing
The machine is able to continuously sew two or more different
patterns without requiring the work clamp foot to be lifted. As may as
20 programs can be registered, and six different patterns can be
stored in one program. (Related parts need to be exchanged for
optional ones.)
Basting stitch mechanism is effective
for the production of beautiful buttonholes.
The machine is equipped
with a multiple knife-dropping function.
The basting stitch is effective on elastic materials such as knits.
Basting stitch: Since the needle thread is tucked in without fail, it will
never jut out of the buttonhole seams.
Basting stitch can be sewn by nine rounds.
Thanks to the multiple knife-dropping function, it is no longer
required that the knife be changed at the time the buttonhole size is
changed. The number of knife dropping times can be automatically
set according to the buttonholing size in cases where the buttonhole
size is frequently changed for small-lot productions or during the
cycle sewing of buttonholes that are different in size.
The double-acting stepping motor type knife mechanism is free from
the faulty dropping/returning of the knife.
Without basting stitch With basting stitch
(The state in which the material is stretched in
the lengthwise direction after buttonholing)
Sewing settings can be easily changed.
Purl stitching
Auxiliary table
(standard accessory)
The machine is provided as standard with a newly-developed auto-lifter driven by a stepping motor. This helps reduce the operator's fatigue.
As for the pedal, one-pedal and two-pedal models can both be changed over and the intermediate stop, which facilitates positioning of the
✽ Please order two-pedal model by a part.
sewing product, can be specified.
The work clamp foot lift can be set as desired. The reverse-rotation needle-up function offers a maximum work clamp foot lift of 17mm.
Start of sewing
End of sewing
Work clamp
position
Presser automatically goes up to
intermediate position.
Whip stitching
State of firstround
stitch
Finished state of
double stitching
Improved maintainability
Thanks to our advanced dry-head technology, no lubrication is required except for the hook section. This eliminates oil stains on the sewing product.
The machine can be completely changed into a dry-head machine by replacing the hook with an optional non-lubricated hook. (In this case,
the maximum sewing speed will be 3,300sti/min)
Adjustment of the hook oil quantity
Explanation of pedal motion
Setting of
sewing product
For double stitching, the bartacking section
is skipped and only the parallel sections are
sewn twice. This prevents any excessively
tight finishes in the bartacking section of the
buttonhole.
The machine eliminates oil stains on the sewing product.
Many functions of the pedal.
Pedal type
1-pedal
Non-lubricated
section
1-pedal
(without intermediate position)
Intermediate position
Maximum position
Presser goes up as high as the pedal
toe down amount of the left side
The first step of the right side pedal
pedal. Presser comes down when the
Sewing position
left side pedal is depressed.
Sewing position
The right side pedal is depressed.
The second step of the right side pedal
Double stitching
(For a changeover between purl stitch
and whip stitch, threading of bobbin,
as well as the bobbin thread tension
need to be changed.)
Purl stitching
All adjustment values are digitalized to enable the operator to set
and store those values on the operation panel.
Initial position
Single stitching
First- and second-round stitches can be
sewn using different stitch widths.
Electronic control of the material feed mechanism, needle feed
mechanism, needle thread trimming mechanism, bobbin thread
trimming mechanism, cloth trimming mechanism, presser lifter
mechanism and other mechanisms has been achieved.
2-pedal
Whip stitching
LED light
(Provided as standard)
All drive mechanisms are electronically controlled
Pedal motion
Basting stitch
The knife supports sewing lengths of 41mm at the maximum. In
addition, knife mechanisms for 70mm and 120mm are optionally
available.
(with intermediate position)
Maximum position
The first step of the right side pedal
Intermediate position
The newly installed "hook oil
quality adjustment screw" can be
found by opening the hook lid
cover. With this screw, the
operator is able to to adjust the oil
quantity in the hook with ease.
Hook
Oil can be easily added to the
hook oil quantity tank with an oiler.
The second step of the right side pedal
Sewing position
The third step of the right side pedal
Presser automatically goes up to
maximum position.
Presser automatically goes up to
maximum position.
Hook section (minute-quantity lubrication)
Oil feeding hole
Oil tank
Maximum position
Intermediate position
Sewing position
Cloth
17mm
Hook oil quality
adjustment screw
Only a minute-quantity of clean oil is fed to the hook
section from the oil tank.
The oil tank is made of shatter proof material, thereby
preventing tank-related troubles such as breakage by
some mishap.
LBH-1790AB
The world's first
(Shorter-thread remaining functions)
LBH-1790A
LBH-1796A
LBH-1790AB (Shorter-thread remaining functions)
The newly-developed shorter-thread remaining
mechanism trims the thread short and eliminates
the trouble of manual thread nipping.
The length of remaining bobbin
thread becomes shorter,
less than 2.5mm on average.
The newly-developed shorter-thread remaining
mechanism trims the thread short and eliminates
the trouble of manual thread nipping.
(220mm presser type)
The LBH-1796A is a subclass model of the
LBH-1790A Series. This product is provided
with a 220mm work clamp foot.
It follows the world's highest sewing speed,
deeply recessed shape of the machine
head and dry-head mechanism of the
existing LBH-1790A. In addition, the
LBH-1796A can also be used as a
simplified indexer to sew three buttonholes
in a row.
Shorter-thread remaining functions
Remaining length of thread varies with sewing conditions.
Conventional Buttonholing Machine
LBH-1796AS (table stand and parts for indexer are optionally available)
The maximum sewing speed of the LBH-1796A is 4,200 sti/min
(equivalent to the maximum sewing speed of the LBH-1790A).
The jump speed has been increased.
Productivity
LBH-1790AB
(LBH-1790A: Max 200 mm/s LBH-1796A: Max 540 mm/s)
Cycle time during continuous sewing has been improved to increase productivity.
LBH-1790A
The LBH-1790A Series follows the world's highest sewing speed and dry-head mechanism of its predecessor model. In addition, this machine
comes with the latest model operation panel which is installed with a USB port. Furthermore, all drive mechanisms have been digitalized to
manage each sewing pattern individually. The maximum sewing speed is 4,200sti/min., and the jump speed is 200mm/s. The cycle time has
been further reduced for continuous sewing.
Increased productivity is ensured !
Simplified buttonholing indexer
LBH-1795A
(120mm presser type)
The knife supports sewing lengths of 41mm at the
maximum. Since the LBH-1795AS is provided as
standard with the 120 mm presser, it is capable of
sewing 120mm long buttonholes. The LBH-1795AS
is capable of sewing long buttonholes such as belt
holes in car seats. In addition, it is applicable to the
sewing of buttonholes in men's shirts (continuous
sewing of two buttonholes and the use of two units
of sewing machines), etc.
The upper limit of the adjustment of the presser foot
pressure has been expanded. The presser foot
pressure is now digitally controlled. As a result, the
machine acquires improved responsiveness to knit
materials and car seats.
When the optionally-available indexer mechanism is installed on the LBH-1796B, the operator
can attend to two units of this model of sewing machine at one time or can use the LK-1903B
button sewing machine together with the LBH-1796A, thereby not only further increasing
productivity, but also ensuring consistent product quality due to the production capability without
requiring the operator to have any special skills.
The sewing machine availability is
further increased if one operator
operates two or more sewing machines.
Work waiting time is reduced even further when
one operator operates two or more sewing machines,
thereby increasing productivity.
LBH-1796A
✽ 220mm sewing may not be made
according to sewing conditions.
Sewing method
Number of units
to which the
operator attends
LBH-1796A
3 buttonholes
× Twice
1
2
Required time
per shirt
Productivity
28 sec.
857 pcs./8 hours
14 sec.
1,714 pcs./8 hours
Condition: Six buttonholes,Machine speed:3,600sti/min,Allowance of 20%, Time required for placement of a garment body on the sewing machine: 6.5 sec. Time required for buttonholing: 9.5sec. ×Twice
(Six buttonholes spaced at 100 mm intervals) Travel between sewing machines in the case of one operator operating two sewing machines: 2 sec. Time required for placement of a garment body on the
2nd sewing machine: 4.0 sec.
Space-saving
LBH-1796A
120mm buttonhole
220mm
Model
One operator operates
2 sewing machines.
14 sec. /pc.
Parts for simplified indexer
As with the general-purpose indexer, the simplified indexer for the LBH-1796A permits
easy addition to and change of the production line, thereby contributing to saved
installation space. The table area of the LBH-1796A is 56% less than that of the
AC-172N-1790.
AC-172N-1790
Option <Parts for simplified indexer>
No.
LBH-1795AS
LBH-1795AS
Description
Auxiliary carrier clamp asm.: A set of a solenoid valve and a regulator
A set of a laser marking lamp and an LED marking lamp
Both sets and
Part No.
40153979
40153980
40153978
Cloth cutting knife, Work clamp, Work clamp foot
The machine is provided as standard with as many as
31 stitch patterns for buttonholing.
Cloth cutting knife
Work clamp
A
It is able to store 99 different patterns in its memory, which can be selected as desired from the operation panel.
1
2
3
9
Round
10
5
Radial
Radial square
11
12
6
Radial taper
bartacking
Radial straight
bartacking
13
7
14
8
Eyelet square
15
For stitch width 5mm
Knife
size
Eyelet radial
16
LBH-1790A
(standard)
Part No.
Mark
Square
4
6.4mm B2702-047
(1/4") -F00
F
9.5mm B2702-047
(3/8") -K00-A
K
11.1mm B2702-047
(7/16") -I00
I
12.7mm B2702-047
(1/2") -L00-A
Eyelet straight
bartacking
17
Eyelet taper
bartacking
18
Semilunar
Semilunar
square
Round square
19
20
21
Semilunar straight
bartacking
22
Eyelet
semilunar
Semilunar taper
bartacking
23
24
14.3mm B2702-047
(9/16") -V00
15.9mm B2702-047
(5/8") -M00-A
M
17.5mm B2702-047
(11/16") -A00
A
19.1mm B2702-047
(3/4") -N00
N
25
Square
semilunar
Square radial
26
Square round
27
28
Square straight
bartacking
29
Radial
semilunar
Square taper
bartacking
30
25.4mm B2702-047
(1")
-Q00-A
Radial round
31
31.8mm B2702-047
(1-1/4") -S00-A
For stitch width 6mm
LBH-1795A
(standard)
LBH-1790S
(standard)
Part No.
(Length of cloth
cutting knife)
(A×B)
Part No.
(Length of cloth
cutting knife)
<Type> (A×B)
Option
(for knits)
Part No.
(Length of cloth cutting knife)
<Type> (A×B)
L B1552-781-000-A
(6.4~19.1mm)
V <1> (4×25mm)
22.2mm B2702-047
(7/8") -P00
Eyelet round
Work clamp foot
B
Mark
145-24409
(6.4~31.8mm)
<3> (6×41mm)
D1508-772-K00
(6.4~25.4mm)
<2> (5×35mm)
D1511-772
-KA0
<2>
B1552-783-000
S (6.4~31.8mm)
<3> (5×41mm)
D1508-773-K00
(6.4~31.8mm)
<3> (5×41mm)
D1511-773
-KA0
<3>
: Supplied as an accessory (For LBH-1790A)
: The work clamp foot for option orders two screw part.
[Part No. SS-6060210-SP]
Other option parts for knit
A
For needle
throwing width
Bartacking,
right cut
Bartacking
Bartacking,
left cut
Bartacking,
center cut
40008646
P B1552-782-000
(6.4~25.4mm)
Q <2> (5×35mm)
Throat plate
Semilunar
round
1790 Option Part No. 1795
S (for knits)
S
D1511-771
-KA0-A
<1>
D1508-771-K00-A
(6.4~19.1mm)
<1> (4×25mm)
40008658
(5~120mm)
: Factory installed on machine
Semilunar
radial
Part No.
<Type>
Part No.
Description
B
Part No. (Marking: A×B)
Basting stitch
+ Knife
Standard (S)
For Knit (option)
5mm
40027553 (1.4×6.2mm)
40027554 (1.2×6.2mm)
6mm
D24027772E00 (1.4×7.4mm)
—
13782065
Hook asm.
13782107
Hook timing gauge
: Factory installed on machine
OPERATION PANEL
When you change LBH-1790A into knitting.
Please order parts of cloth cutting knife (standard: 25.4mm), work clamp, work clamp foot, throat plate, hook asm. and hook timing gauge.
STANDARD LIQUID CRYSTAL PANEL (NEW)
USB Port is provided as standard on the standard panel
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. The main body of the sewing machine is provided as
stanrard with a USB port. Now, date can be input/output to/from
various kinds of media (SD (Secure Digital Card), CF (Compact
Flash), etc.) by means of a USB thumb device and a card reader.
Designation
USB port
Non-lubricated hook
All kinds of data can be entered on or selected from the operation panel.
The panel display supports 14 different languages.
Work clamp
(For sewing length
of 70 mm, 120mm)
OPTION
Foot pedal for standing work
Foot pedal
Part No.
Feature
Description
400-06345
RP hook (asm.)
400-06349
RP bobbin case
137-29660
Hook sleeve (asm.)
SS-8660612-TP (4 pcs.)
Screws
400-06340
Work clamp arm spacer
SM-6040450-TP (3 pcs.)
Screws
145-23252
Work clamp foot 70
145-23401
Work clamp 70
145-23708
Urethane work clamp 70
145-24102
Flat work clamp 70
400-08646
Work clamp foot 120 (asm.)
400-08658
Work clamp 120
400-06335
Work clamp arm 120
400-06339
Cloth feeding plate 120
40028682
Close cam 120
40112711
Lifting plate 120
By the installation of non-lubricated hook, the machine
is changed to be a fully dry-head machine. (In this
case, the maximum sewing speed will be 3,300sti/min)
Exclusive to 70mm
Selectable
PK-57✽
Two-Pedal switch
SM-6050800-SP (2 pcs.)
Screws
[Part No. GPK570010B0]
[Part No. 40003491]
SS-6060210-SP (2 pcs.)
Screws
G5001-198-0A0-A
Electric bobbin winder (asm.)
400-05405
Power cord (asm.)
400-53150
Tension controller (asm.)
SK-3452001-SE
Wood screws
GPK-510010B0
Pedal switch (asm.)
400-03493
Junction cable (asm.)
✽ To connect the cable asm. to the electrical box,
conversion cable (separately available) is necessary.
Electric bobbin winder
Pedal switch conversion cable asm.
[Part No. 40003493]
2-pedal unit
for standing work
Exclusive to 120mm
The work clamp is applicable
to the sewing length of 70mm
or 120mm. With this work
clamp, holing of belt holes in
child seat is possible.
Common to 70 mm
and 120 mm
It is a device for winding bobbin separately.
SPECIFICATIONS
LBH-1790AB
Model name
LBH-1790A
LBH-1795A
LBH-1796A
Max. 4,200sti/min, Normal 3,600sti/min When the non-lubricated hook (optional) is used: 3,300sti/min
Sewing speed
34.6mm
Needle bar stroke
Size of cloth cutting knife
6.4~22.2mm (1/4"~7/8")
6.4~31.8mm (1/4"~1-1/4")
6.4~25.4mm
Max. 4.0mm
Max. 5.0mm (with special-specification part: Max. 10mm*)
Max. 5.0mm
Max. 25mm
Max. 41mm
(optional: 70mm, 120mm)
Max. 220mm
Bartacking width
Buttonhole length
Max. 120mm
0.05mm
Precision of needle throwing mechanism
Active tension (electronic thread tension control system)
Needle thread tension
Automatically computed from the size of the buttonhole and stitch pitch
Number of stitches
DP×5 (#11J) #11J~#14J
Needle (at the time of delivery)
DP type, full-rotary hook Non-lubricated hook (optional)
Hook
Lift of the work clamp
14mm (17mm when the reverse-rotation needle-up function is used)
Parallel lifting 6mm
Provided as standard (stepping motor type)
Auto-lifter
Stepping motor
Needle throwing system
Intermittent feed by stepping motor
Cloth feeding system
Stepping motor
Cloth cutting knife system
31 patterns
Number of standard patterns
Max. 99 patterns
Number of patterns that can be input
Built-in the machine head
Bobbin thread winder
Compact AC servomotor (direct-drive system)
Machine head drive system
3-phase 200~240V/250VA
Power requirement / Power consumption
Only the hook section needs a minute-quantity lubrication.
✽ No lubrication is required when the non-lubricated hook (optional) is used.
Lubrication
Hook: JUKI New Defrix Oil No.1 (equivalent to ISO VG7)
Lubricating oil
Machine head
(include motor) 55kg,
Control box 5.5kg
Weight
Machine head
(include motor) 55kg,
Control box 6kg
✽ “sti/min”stands for “Stitches per Minute”
✽ The special-specification part is available on a special order. Contact our branch or office in your area.
★ 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.
WHEN YOU PLACE ORDERS
Please note when placing orders, that the model name should be written as follows:
Machine head
Control box
MC602 S
LBH179 A
Model
Standard
120mm type
220mm type
Code
0
5
6
Type
Code
S
Standard
Shorter-thread
remaining functions
B
Power supply
3-phase
200~240V
220~240V
Single-phase CE 220~240V
✽ "B": Model code "0" only.
(not provided with power switch)
Code
E
K
Operation panel Code
Standard
S
N
To order, please contact your nearest JUKI distributor.
JUKI ECO PRODUCTS
The LBH-1790A Series is an eco-friendly product which complies with
JUKI ECO PRODUCTS standards for protecting the environment
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.
This sewing machine reduces power consumption by 27% as compared with the conventional models.
For details of JUKI ECO PRODUCTS, refer to: http://www.juki.co.jp/eco_e/index.html
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.
Head Office
Registered Organization :
The Scope of the Registration : The activities of research,
development, design, sales, distribution, and maintenance
services of industrial sewing machines, household sewing
machines and industrial robots, etc., including sales and
maintenance services of data entry systems.
2-11-1, TSURUMAKI, TAMA-SHI,
TOKYO 206-8551, JAPAN
SEWING MACHINERY BUSINESS UNIT
PHONE : (81) 42-357-2254
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.
MAY, 2015 Printed in Japan (TN)
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