JUKI LBH-1790A Series, LBH-1795A, LBH-1790S Specifications

LBH-1790A Series

Computer-controlled, High-speed, Buttonholing Machine

LBH-1790A

The thread tension and all drive mechanisms

are electronically controlled.

Series

LBH-1790AS

(Table stand is optionally available.)

The LBH-1790A Series follows

the world's highest sewing speed and

dry-head mechanism.

Auxiliary table

(standard accessory)

LED light
(Provided as standard)

17mm

by Digitization

Excellent operability

by Digitization

Excellent seam quality

Many functions of the pedal.

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
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.

Higher productivity

Cycle sewing and continuous sewing.

All drive mechanisms are electronically controlled

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.

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.

All adjustment values are digitalized to enable the operator to set
and store those values on the operation panel.

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.

Twenty different programs can be registered, and as many as 15
different patterns can be stored in one program.

Cycle 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.)

Continuous sewing

JUKI's unique active tension (Electronic thread tension control system).

Basting stitchWithout basting stitch

With basting stitch

(The state in which the material is stretched in
the lengthwise direction after buttonholing)

Finished state of
double stitching

State of firstround

stitch

Whip stitchingPurl stitching

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 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.

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.

Thread tension for basting stitching can be specified separately.

(For a changeover between purl stitch
and whip stitch, threading of bobbin,
as well as the bobbin thread tension
need to be changed.)

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.

First- and second-round stitches can be
sewn using different stitch widths.

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.

LBH-1790A

Series

LBH-1790AS

Solenoid

Needle thread tensioner

Explanation of pedal motion

Pedal motion

Initial position

②Intermediate position ①Maximum position ①Maximum position

Setting of
sewing product

Start of sewing

End of sewing

Pedal type

2-pedal

1-pedal 1-pedal

The right side pedal is depressed.

The second step of the right side pedal

The third step of the right side pedal

② Presser automatically goes up to

intermediate position.

① Presser automatically goes up to

maximum position.

① Presser automatically goes up to

maximum position.

Work clamp
position

Cloth

③

②

①

Sewing position

Intermediate position

Maximum position

(without intermediate position) (with intermediate position)

Presser goes up as high as the pedal
toe down amount of the left side
pedal. Presser comes down when the
left side pedal is depressed.

→③Sewing position

The first step of the right side pedal

→③ Sewing position

The first step of the right side pedal

→② Intermediate position

The second step of the right side pedal

→③ Sewing position

Basting stitch mechanism is effective
for the production of beautiful buttonholes.

Sewing settings can be easily changed.

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. In addition, the knife
pressure can be changed according to the material to be sewn.

The knife supports sewing lengths of 41mm at the maximum. In
addition, knife mechanisms for 70mm and 120mm are optionally
available.

The machine is equipped
with a multiple knife-dropping function.

Whip stitching󱽗Purl stitching Double stitching󱽗Single stitching

LBH-1795A

The machine eliminates oil stains on the sewing product.

Adjustment of the hook oil quantity

Computer-controlled, High-speed, Buttonholing Machine (120mm presser type

)

120mm buttonhole

LBH-1795AS

LBH-1795AS

Oil feeding hole

Hook oil quality

adjustment screw

Improved maintainability

It is able to store 99 different patterns in its memory, which can be selected as desired from the operation panel.

The machine is provided as standard with as many as
31 stitch patterns for buttonholing.

Square

1

Round2Radial square

3

Semilunar

11

Eyelet round

17

Semilunar

radial

25

Semilunar

round

26

Bartacking

27

Square radial

18

Square

semilunar

19

Square round

20

Radial

semilunar

23

Radial round

24

Round square

12

Semilunar

square

13

Eyelet

semilunar

16

Radial

4

Eyelet square7Eyelet radial

8

Radial straight

bartacking

5

Eyelet straight

bartacking

9

Eyelet taper

bartacking

10

Semilunar straight

bartacking

14

Square taper

bartacking

22

Bartacking,

center cut

30

Bartacking,

left cut

29

Bartacking,

right cut

28

Square straight

bartacking

21

Basting stitch

+ Knife

31

Semilunar taper

bartacking

15

Radial taper

bartacking

6

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.

USB Port is provided as standard on the standard panel

All kinds of data can be entered on or selected from the operation panel.

The panel display supports 14 different languages.

Thanks to our advanced dry-head technology, no lubrication is required except for the hook section.
This eliminates oil stains on the sewing product.

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.

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 12-mm 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.

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.

Oil can be easily added to the hook oil quantity tank with an oiler.

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)

Non-lubricated

section

(minute-quantity

lubrication)

Hook section

Hook

Oil tank

USB card reader

USB port

SD SM

mini

SD

CF

MS

STANDARD LIQUID CRYSTAL PANEL (NEW

)

OPERATION PANEL

OPTION

Cloth cutting knife, Work clamp

SPECIFICATIONS

Throat plate

Designation Part No. Description Feature

400-06345

400-06349

137-29660

SS-8660612-TP (4 pcs.)

400-06340

SM-6040450-TP (3 pcs.)

145-23252

145-23401

145-23708

145-24102

400-08646

400-08658

400-06335

400-06339

400-06341

400-06342

SM-6050800-SP (2 pcs.)

SS-6060210-SP (2 pcs.)

G5001-198-0A0-A

400-05405

400-53150

SK-3452001-SE

GPK-510010B0

400-03493

RP hook (asm.)

RP bobbin case

Hook sleeve (asm.)

Screws

Work clamp arm spacer

Screws

Work clamp foot 70 (asm.)

Work clamp 70

Urethane work clamp 70 Selectable

Flat work clamp 70

Work clamp foot 120 (asm.)

Work clamp 120

Work clamp arm 120

Cloth feeding plate 120

Close cam 120

Lifting plate 120

Screws

Screws

Electric bobbin winder (asm.)

Power cord (asm.)

Tension controller (asm.)

Wood screws

Pedal switch (asm.)

Junction cable (asm.)

Non-lubricated hook

Exclusive to 70mm

Work clamp
(For sewing length
of 70 mm, 120mm)

Exclusive to 120mm

Common to 70 mm
and 120 mm

Electric bobbin winder

2-pedal unit
for standing work

B1552-781-000-A
(6.4~19.1mm)
<1> (4×25mm)

D1508-771-K00-A
(6.4~19.1mm)
<1> (4×25mm)

145-24409
(6.4~31.8mm)
<3> (6×41mm)

40008658
(5~120mm)

B1552-782-000
(6.4~25.4mm)
<2> (5×35mm)

B1552-783-000
(6.4~31.8mm)
<3> (5×41mm)

A

B

It is a device for winding bobbin separately.

Work clamp Work clamp foot

Knife

size

6.4mm
(1/4")

B2702-047

-F00

F

K

I

L

V

M

A

N

P

Q

S

9.5mm
(3/8")

B2702-047

-K00-A

11.1mm
(7/16")

B2702-047

-I00

12.7mm

(1/2")

B2702-047

-L00-A

14.3mm
(9/16")

B2702-047

-V00

15.9mm

(5/8")

B2702-047

-M00-A

17.5mm

(11/16")

B2702-047

-A00

19.1mm

(3/4")

B2702-047

-N00

22.2mm

(7/8")

B2702-047

-P00

25.4mm

(1")

B2702-047

-Q00-A

31.8mm

(1-1/4")

B2702-047

-S00-A

Cloth cutting knife

Part No.

Mark

A

B

For stitch width 5mm For stitch width 6mm

LBH-1790A (standard)

Part No.

(Length of cloth cutting knife)

<Type> (A×B)

Part No.

(Length of cloth

cutting knife)

(A×B)

Part No.

(Length of cloth

cutting knife)

<Type> (A×B)

D1511-771

-KA0-A
<1>

D1511-772

-KA0
<2>

D1511-773

-KA0
<3>

Part No.
<Type>

40008646

Part No.

Option (for knits) LBH-1795A (standard) LBH-1790S (standard)

D1508-772-K00
(6.4~25.4mm)
<2> (5×35mm)

D1508-773-K00
(6.4~31.8mm)
<3> (5×41mm)

1795

S

1790

S

: Supplied as an accessory (For LBH-1790A): Factory installed on machine

: Factory installed on machine

For needle

throwing width

Part No. (Marking: A×B)

5mm

Standard (S) For Knits (option)

400-04350 (1.4×6.2mm)

6mm

400-04351 (1.4×7.4mm)

400-04352 (1.2×6.2mm)

400-04353 (1.2×7.4mm)

Model name

Needle bar stroke

Size of cloth cutting knife

Bartacking width

Buttonhole length

Precision of needle throwing mechanism

Needle thread tension

Number of stitches

Needle (at the time of delivery)

Hook

Lift of the work clamp

Auto-lifter

Needle throwing system

Cloth feeding system

Cloth cutting knife system

Number of standard patterns

Number of patterns that can be input

Bobbin thread winder

Machine head drive system

Power requirement/ Power consumption

Sewing speed

Lubrication

Lubricating oil

Weight

LBH-1790A Series

34.6mm

6.4~31.8mm (1/4"~1-1/4")

Max. 5.0mm (with special-specification part: Max. 10mm*)

Max. 41mm (optional: 70mm, 120mm) , LBH1795:120mm

0.05mm

Active tension (electronic thread tension control system)

Automatically computed from the size of the buttonhole and stitch pitch

DP×5 (#11J) #11J~#14J

DP type, full-rotary hook

Non-lubricated hook (optional)

14mm (17mm when the reverse-rotation needle-up function is used)

Provided as standard (stepping motor type)

Stepping motor

Intermittent feed by stepping motor

Stepping motor

31 patterns

Max. 99 patterns

Built-in the machine head

Compact AC servomotor (direct-drive system)

3-phase 200~240V/250VA

Max. 4,200sti/min, Normal 3,600sti/min

When the non-lubricated hook (optional) is used: 3,300sti/min

Only the hook section needs a minute-quantity lubrication.

✽ No lubrication is required when the non-lubricated hook (optional) is used.

Hook: JUKI New Defrix Oil No.1 (equivalent to ISO VG7)

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.

Mark

Other option parts for knite

Description

Hook asm.

Hook timing gauge

Part No.

13782065

13782107

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)

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.

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 :

(

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.

MC602

LBH179 AS

S

Machine head

Control box

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.

JUKI ECO PRODUCTS

The LBH-1790A 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 27% 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.

CodeOperation panel

S

Standard

CodeType

S

Standard

Code

Model

Knife width Work clamp type

0

6.4~22.2mm 4mm × 25mm

5

6.4~31.8mm 5mm × 120mm

CodePower supply

E
K

N

3-phase 200~240V

Single-phase

220~240V

CE 220~240V

(not provided with power switch)