Computer-controlled, High-speed, Buttonholing Machine

JUKI Simple Series sewing machine LBH-1790S has been designed to have simplified and narrowed down capabilities that are essentially required to produce JUKI's established seam quality.
In addition, it supports the operator with the voice guidance system to improve work efficiency.

Product features

  • Voice guidance for the operator

    This sewing machine is provided as standard with the voice-guidance system with
    clock function.
    The voice guidance can be used for the purpose of production support such as giving the operator information about the number of pieces produced, work progress management and the operation rate of sewing machine, though the initial setting is required.

    • Setting of functions such as the pattern number and the needle thread tension can be entered through the operation panel with ease. It is also possible to easily change the distance between buttonholes by means of the enlargement / reduction function.
    • The operation panel is provided as standard with a USB port. This means that the sewing machine data management and software updating can be carried out with ease by means of the USB port.

  • Higher productivity

    This sewing machine achieves higher productivity with its improved capabilities such as the maximum sewing speed of 4,200 sti/min, quick acceleration at the beginning of sewing and quick deceleration at the end of sewing, increased thread trimming speed and the auto-lifter performance.

Basic performance

  • Main functions driven electrically

    The electric-driven mechanism has been adopted for the work clamp foot lifter, needle / bobbin thread trimmers, work clamp foot pressure regulator, cloth trimming knife and thread tension controllers, thereby ensuring stable sewing that produces beautiful seams with less operating noise.

  • Work clamp foot lifting height

    The work clamp foot lifting height can be set as desired. The work clamp foot can be lifted as high as to 17 mm by the use of the reverse-rotation needle-up function.

  • Active tension
    (electronic thread tension control mechanism)

    • The needle thread tension can be separately set for the parallel section and bartacking section of the buttonhole seam according to various sewing conditions (thread, material, sewing speed, etc.) given, and those setting data can be stored in memory.
    • The needle thread tension can be changed over at the parallel and bartacking section of the buttonhole seam without fail, thereby producing beautifully-finished buttonhole stitch shape.
    • The needle thread tension to be employed at the beginning and end of sewing can be set individually. This helps prevent slip-off of the thread at the beginning of sewing and unravel of the finished seam.

  • Basting stitch on elastic materials

    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.

  • Multiple-times knife dropping

    Thanks to JUKI's unique multiple-times knife dropping function, the knife replacement is no longer required even when the buttonholing size is changed. In the case of small-lot production, frequent change in the sewing size and / or sewing of different cycle sewing patterns with different sewing sizes are required. In such a case, the number of times to drop the cloth trimming knife are automatically set according to the buttonholing size.

  • Easy changeover of sewing settings

    Changeover between purl stitching and whip stitching and between single stitching and double stitching can be carried out with ease.

  • As many as 31 different buttonholing shapes are provided as standard

    As may as 99 different sewing patterns can be stored in memory.
    The sewing patterns that are stored in memory can be selected as desired through the operation panel.


Model name LBH-1790SS
Application Standard
Lubrication Semi-dry head (Hook : minute-quantity lubrication)
Max. sewing speed 4,200sti/min (at the time of delivery : 3,600sti/min)*
Size of cloth cutting knife 6.4~31.8mm (1/4"~1-1/4")
Buttonhole length Max. 41mm
Needle thread tension Active tension (solenoid)
Needle (at the time of delivery) DP×5 (#11J) #11J~#14J
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 Stepping motor
Cloth cutting knife system Motor-driven clamp system
Number of standard patterns 31 patterns
Number of patterns that can be input Max. 99 patterns
Machine head drive system Compact AC servomotor (direct-drive system)
Power requirement /
Power consumption
Single-phase 200~240V / 370VA
Weight Machine head (include motor) 55kg, Control box 5.5kg

*“sti/min”stands for “Stitches per Minute”

When you place orders



  P/N P/N P/N P/N P/N P/N P/N
Needle width:inch mm Standard Standard For Hosiery Standard Flat knife - -
1/4 6.4 B2702047F00 B1552781000A D1508771K00A B15117710A0B B2745771F00 B2746771000 13782800
3/8 9.5 B2702047K00A B2745771K00
7/16 11.1 B2702047I00 - - -
1/2 12.7 B2702047L00A B2745771L00 B2746771000 13782800
9/16 14.3 B2702047V00 B2745771H00
5/8 15.9 B2702047M00A B2745771M00
11/16 17.5 B2702047A00 -
3/4 19.1 B2702047N00 B2745771N00
7/8 22.2 B2702047P00 B1552782000 D1508772K00 D1511772KA0 B2745771P00
1 25.4 B2702047Q00A B2745771Q00
1-1/8 28.6 - - - - B2745771R00
1-1/4 31.8 B2702047S00A B1552783000 D1508773K00 D1511773KA0 B2745771S00