Computer-controlled, High-speed, Lockstitch, Button 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

  • Lockstitch, Button Sewing System of standard type

    The machine achieves sewing speed of 2,700sti/min The machine's thread-trimming etc. have been increased to significantly shorten total cycle time. The machine is provided as standard with 50 different sewing patterns at higher productivity. The LK-1903BN is a lockstitch button sewing machine which is not only applicable to many different sewing specifications but also able to carry out cycle sewing and produces high-quality seams.

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

    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 machine achieves sewing speed of 2,700sti/min. The machine's starting, stopping, thread-trimming and automatic presser lifting speeds have been increased to significantly shorten total cycle time.

  • Excellent seam quality.

    Needle thread grasping mechanism helps produce consistent knot tying at the beginning of sewing.

  • Many different sewing patterns.

    • The machine is provided as standard with 50 different sewing patterns. The machine permits easy changeover of sewing patterns for effortless execution of an inexhaustible range of sewing specifications.
    • The LK-1903BN is also able to sew buttons using the same data used for the LK-1903 (Data in EP-ROM are enabled by conversion).
  • 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.

  • Oil stains are eliminated.

    • 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 clean oil is supplied from the oil tank to the hook.
  • Eco-friendly power saving

    An encoder is installed in the pulse motor, thereby achieving substantially improved power-consumption saving.

  • Auto-lifter mechanism utilizing a system.

    • The machine is provided as standard with auto-lifter that uses a stepping-motor system. This helps reduce operator fatigue.
    • It is also possible to change over the stroke of the auto-lifter from a onestep 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 work clamp foot lift can be set to a maximum of 13mm.

  • The machine is provided as standard with the active tension
    (electronic thread tension control mechanism).

    • 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 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 LED light can adjust the light intensity to 5 levels, and Off setting is also possible. The operator can set the brightness which is easy to work, improving work efficiency.


Model name LK-1903BN
Max. sewing speed 2,700sti/min*
Button size Type : Round-shaped, flat button
Size : φ8~φ32mm
301 : φ8~φ20
302 : φ10~φ20
OPTION : φ15~φ32
Stitch length 0.1~10mm (0.1mm step)
Needle bar stroke 45.7mm
Lift of the work clamp foot Max. 13mm
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×17 (#14)
Hook Standard 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
Enlarging/Reducing facility 20~200%(1% step), Pattern enlargement /reduction can be done by increasing /decreasing the stitch length
Memory medium Internal-organs memory
Bobbin thread counter Provided as standard (up/down method)
Bird's nest preventing /
Shorter-thread remaining functions
Supplying and sorting of button -
Button feed -
Button feed mode -
Lubricating oil
Hook: minute-quantity lubrication
JUKI New Defrix Oil No.2 (equivalent to ISO VG32)
Sewing machine motor Compact AC servomotor (direct-drive system)
Power consumption 250VA
Weight Machine head (include motor) 42kg, Control box 5.1kg

*“sti/min” stands for “Stiches per Minute”
*Other company names and product names/brand names are trademarks or registered trademarks of the respective companies.

When you place orders