Computer-controlled, High-speed, Buttonholing Sewing System

Management of sewing performance and sewing machine with JUKI's next-generation sewing system.
Machine is mounted with inbuilt NFC (Near Field Communication) and communication devices capable of a 2-way data transmission.

Product overview

Product features

  • Shorter - thread remaining mechanism (LBH-1790ANB)

    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.

  • Management of sewing performance and sewing machine by the utilization of IoT (Internet of Things)

    Management, browsing and editing of data can be carried out on the application software

    Data on sewing machine adjustments made according to the product to be sewn can be transferred to a commercially-available Android tablet in contactless mode. This enables quick check for uniform settings as well as confirmation of conditions of sewing machines in a sewing line, thereby facilitating setup changes. The operation panel is also provided as standard with a USB port. Data management and software update can be carried out with ease using a USB thumb drive.
    Data items of sewing can be numerically managed to ensure "stable quality" and "reduction in time required for setup changes".
    Quantified sewing data can be externally taken from the sewing machine using an Android tablet or USB thumb drive.
    *Android OS Version 6.0 is recommended to use JUKI Smart APP.
     (Operation is confirmed with respect to Versions 5.0 and later. )
     Contact JUKI distributor in your area for how to use the application software.

Basic performance

  • Higher productivity

    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.

  • 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.)

  • All drive mechanisms are electronically controlled

    • 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.
  • Operator-friendly environment

    • 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-1790AN 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.


  • 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.

    * Please order two-pedal model by a part.

  • 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.
    • Thread tension for basting stitching can be specified separately.

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

    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 equipped with a multiple knife-dropping function

    • 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.
    • The knife supports sewing lengths of 41mm at the maximum. In addition, knife mechanisms for 70mm and 120mm are optionally available.
  • Sewing settings can be easily changed

  • The machine eliminates oil stains on the sewing product

    • 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

    • 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 is provided as standard with as many as 31 stitch patterns for buttonholing

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


Model name LBH-1790ANB LBH-1790AN
Sewing speed Max. 4,200sti/min*, Normal 3,600sti/min* When the non-lubricated hook (optional) is used: 3,300sti/min*
Needle bar stroke 34.6mm
Size of cloth cutting knife 6.4~22.2mm (1/4"~7/8") 6.4~31.8mm (1/4"~1-1/4")
Bartacking width Max. 4.0mm Max. 5.0mm (with special-specification part: Max. 10mm*)
Buttonhole length Max. 25mm Max. 41mm (optional: 70mm, 120mm)
Precision of needle throwing mechanism 0.05mm
Needle thread tension Active tension (electronic thread tension control system)
Number of stitches Automatically computed from the size of the buttonhole and stitch pitch
Needle (at the time of delivery) DP×5 (#11J) #11J~#14J
Hook DP type, full-rotary hook Non-lubricated hook (optional)
Lift of the work clamp 14mm (17mm when the reverse-rotation needle-up function is used)
Auto-lifter Provided as standard (stepping motor type)
Needle throwing system Stepping motor
Cloth feeding system Intermittent feed by stepping motor
Cloth cutting knife system Stepping motor
Number of standard patterns 31 patterns
Number of patterns that can be input Max. 99 patterns
Bobbin thread winder Built-in the machine head
Machine head drive system Compact AC servomotor (direct-drive system)
Power requirement / Power consumption 3-phase 200~240V/250VA
Lubrication Only the hook section needs a minute-quantity lubrication.
* No lubrication is required when the non-lubricated hook (optional) is used.
Lubricating oil Hook: JUKI New Defrix Oil No.1 (equivalent to ISO VG7)
Weight Machine head (include motor) 55kg, 
Control box 5.5kg
Machine head (include motor) 55kg,
Control box 6kg

*sti/min is the abbreviation for "stitches per minute"
*The special-specification part is available on a special order. Contact our branch or office in your area.
• Other company names and product names/brand names are trademarks or registered trademarks of the respective companies.

When you place orders



Knife size Mark P/N Remarks P/N P/N P/N
inch mm -
1/4 6.4 F B2702047F00 - B2745771F00 B2746771000 13782800
3/8 9.5 K B2702047K00A   B2745771K00
7/16 11.1 I B2702047I00   -
1/2 12.7 L B2702047L00A Knife at shipping for other than LBH-1796A and 1796AN. B2745771L00
9/16 14.3 V B2702047V00   B2745771H00
5/8 15.9 M B2702047M00A   B2745771M00
11/16 17.5 A B2702047A00   -
3/4 19.1 N B2702047N00   B2745771N00
7/8 22.2 P B2702047P00   B2745771P00
1 25.4 Q B2702047Q00A   B2745771Q00
1-1/8 28.6 R - - B2745771R00
1-1/4 31.8 S B2702047S00A LBH-1790AB, 1790ANB/ 1796A, and 1796AN are not supported. B2745771S00
Maximum knife size per machine type
Model Limitation by throat plate Limitation by presser Maximum knife size Remarks
25.4mm 22.2mm 22.2mm Presser type: the maximum knife size is 31.8mm, only when using the Type 3 (41mm).
25.4mm 22.2mm 22.2mm -
S(Standard) K(Knitwear) S(Standard) K(Knitwear)
Model Sewing area
(Horizontal/ vertical)
Presser arm
(area supported)
4×25 Type 1 ST 40027553
(1.4 X 6.2)
- 40027554
(1.2 X 6.2)
40004205 - 40004205 -
5×35 Type 2
5×41 Type 3
5×70 Type 5 OP 40006339 - 40006339 -
5×120 Type 5
4×25 Type 1 ST - 40153019*2
(1.4 X 6.2 X 1.8 X 10.3)
(1.4 X 5.2 X 1.8 X 8.3)
- - 40160114*2
- Necessary for the Throat plate base unit
5×35 Type 2
5×41 Type 3 - - - - - -

*1 This is an optional guage that prevents cloth displacement that can oocur at a stepped part. A presser to be used is B1552781000A/B1552782000 .
*2 The width of the convex part of the needle plate is wider than any convex part of needle plates with other specifications. If this is used with a feed plate with other specifications together, the feed plate may interfere with this.

Figure -
Model Sewing area
(Horizontal/ vertical)
Presser arm
(area supported)
S(Standard) K(Knitwear) Springs are available Single item S(Standard) K(Knitwear)
4×25 Type 1 ST 30 X 5.6 B1552781000A D1508771K00A B15117710A0B B1511771000B B15527810A0 -
5×35 Type 2 40 X 6.6 B1552782000 D1508772K00 D1511772KA0 B1511772000A B15527820A0
5×41 Type 3 46 X 6.6 B1552783000 D1508773K00 D1511773KA0 B1511773000A B15527830A0
5×70 Type 5 OP 76 X 6.6 14523708 145233401 14523252 14523203 -
5×120 Type 5 127 X 6.6 40008658 - 40008646 40008647 -
4×25 Type 1 ST 30 X 5.6 40160113
- B15117710A0B B1511771000B - -
5×35 Type 2 40 X 6.6 B1552782000*3 13946454 B1511772000A
5×41 Type 3 46 X 6.6 - - -

*3 This is a component part (optional) for *1.

Supplement Maximum sewing are Frame
10mm×135mm Common frame*4
10mm×135mm Common frame*4

*4 For LBH-1790A, 1790AN, 1790AB, 1790ANB, 1795A, and 1795AN, the change of specification can be made only by changing the parts since those machines uses the same frame

Caution Figure
When replacing the throar plate between LBH-1790A* and LBH-1790A*B, changing the machine type setting in the memory is required since the distance between the needle entry and knife different than the standard type.
[Size of needle entry knife groove]
LBH-1790A*B,LBH-1796A*: 1mm
LBH1790A*,LBH-1795A*,LBH-1790S: 2mm
LBH-1790S, 1796A and 1796AN use the special frame, which if not compatible with LBH-1790S, 1790A, 1790AN, 1790AB, 1790ANB, 1795A and 1795AN. therefore, the presser type 1 to 3 cannot be assembled. -
There is a difference of timing gage in LBH-1790S, 1790A and 1790AN; LBH-1790AB and 1790AMB.
Since the thickness of the throat plate is different, the length of the timing gage differs. The hook timing does not change since the total length is the same.
When the feed width is more than 5mm with LBH-1790S, 1790A, the presser arm and oil shield need to be replaced.
(For details, refer to the parts book, specia specifications 2.)
When the feed direction is more than 41mm with LBH-1790S, 1790A, the presser arm needs to be replaced.
(For details, refer to the parts book, special specifications 2.)
Guage HOOK
Model Sewing area
(Horizontal/ vertical)
S(Standard) K(Knitwear) Non lubrication hook
P/N Name of part Qty Remarks
4×25 Type 1 13729066 13782065 [1]40006345
[1]RP hook asm.
[2]RP bobbin case
[3]Hook sleeve asm.
Complete fry head machine is produced by installing non lubrication hook. (Max. sewing speed reaches 3,300 st/min.)
5×35 Type 2
5×41 Type 3
4×25 Type 1 13729066 -
5×35 Type 2
5×41 Type 3
Guage Electric bobbin winder
P/N Name of part Qty Remarks
G50011980A0A Electric bobbin winder asm. 1 Device that can wind bobbin thread independently.
40005405 Bobbin winder powe cord asm. 1
40053150 Bobbin winder thread tension asm. 1
SK3452000SC Wood screw 4
Guage 2 pedal for standing work (PK) 2 pedal
P/N Name of part Qty P/N Name of part Qty
GPK510010B0 2 pedal for standing work asm. 1 40003491 4 position pedal sensor 1
GPK570010B0 1 pedal for standing work asm. 1 26104851 Connecting rod 1
40003493 PK pedal joint cord asm. 1      
Guage Points of replacement for feed 70mm and 120 mm
No. P/N Name of part Qty Remarks
[1] 40006335 Presser arm 120 1 Common to 70 mm and 120 mm
[2] 40006340 Presser arm spacer 1 Not necessary when using 120 mm presser
[3] SM6040450TP Setscrew 3 Not necessary when using 120 mm presser
[4] 40008646 Presser foot 120 (asm.) 1 For feed 120 mm
[5] 40008658 Presser foot 120 1 For feed 120 mm
[6] 14523252 Presser foot 70 (asm.) 1 For feed 70 mm
[7] 14523401 Presser 70 1 For feed 70 mm (for knits)
[8] 14523708 Urethane presser 70 1 * Optional for feed 70 mm (for cloth)
[9] 14524102 Flat presser 70 1 * Optional for feed 70 mm (for heavy-weight cushion stuff)
[10] SS6060210SP Setscrew 2 Common to 70 mm and 120 mm
[11] SD0790203SP Hinge screw - Incorporated in machine head
[12] 40028682 Close cam 120 1 Common to 70 mm and 120 mm
[13] 40112711 Lifting plate 120 1 Common to 70 mm and 120 mm
[14] SM6050800SP Setscrew 2 Common to 70 mm and 120 mm
[15] 40004203 Feed base (asm.) - Incorporated in machine head
[16] SM8050502TP Setscrew - Incorporated in machine head
[17] 40004288 Presser arm shaft - Incorporated in machine head
[18] 40006339 Cloth feed plate 120 1 Common to 70 mm and 120 mm
[19] SM6040602TP Setscrew - Incorporated in machine head