Juki LK-1901B

Computer-controlled, High-speed, Bartacking Machine

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The Juki LK-1901B is provided with a material-drawing mechanism which draws the right and left parallel portions of an eyelet buttonhole near to one another. The Juki LK-1901B performs bartacking with the right and left parallel portions of the eyelet buttonhole drawn near to one another after the buttonhole is clamped under the work clamp foot, thereby finishing highly durable and well-tensed eyelet buttonholes.

Higher productivity.
The Juki LK-1901B achieves sewing speed of 3,200sti/min. The machine’s starting, stopping, thread-trimming and automatic presser lifting speeds have been increased to significantly shorten total cycle time.

Excellent workability and operability. (Low-noise and low-vibration)
The direct-drive head (with no belt), which is directly connected to a compact servomotor, achieves outstanding. This head helps create a comfortable working environment with reduced vibration and noise.

The arm section of the machine head is fitted with a hand pulley. This allows the operator to visually check the needle entry points.

Excellent seam quality.
Needle thread grasping mechanism helps produce consistent knot tying at the beginning of sewing. (This device has been factory-set to “invoking prohibited” status at the time of delivery.)

The machine is provided as standard with the active tension (electronic thread tension control mechanism).
Since the Juki LK-1901B 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 IP-420U 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.

Model name Eyelet buttonhole
bartacking machine
Belt-loop attaching machine
Juki LK-1901B-SS Juki LK-1902B-SS Juki LK-1902B-HS
Application  Standard  Standard  For heavy-weight
Max. sewing speed  3,000sti/min✽
Sewing area  30mm (L) × 40mm (W)
Stitch length  0.1~10mm
Needle bar stroke  41.2mm
Lift of the work clamp foot  Standard 14mm
(by using the reverse-rotation needle-up function 17mm)
Auto-lifter  Provided as standard (stepping motor type)
Needle thread tension  Active tension (electronic thread tension control mechanism)
Needle (at the time of delivery)  DP×5 (#14)  DP×5 (#14)  DP×17 (#21)
Hook  Standard shuttle hook
Number of stitches
that can be stored in memory
 Max. 20,000 stitches
Applicable pattern number  11, 12, 13  17, 18 (19, 20, 21, 22*)
*This device has been factory-set to
“ invoking prohibited ”
status at the time of delivery.
Number of data that can be input  200 patterns
(for up to 150 patterns, sewing data can be added.)
Enlarging/Reducing facility  20~200% (1% step), Pattern enlargement/reduction
can be done by increasing/decreasing the stitch length
Memory method  Internal-organs memory
Material drawing amount  Max. 3mm  –
Bobbin thread counter  Provided as standard (up/down method)
Lubrication  Hook: minute-quantity lubrication
Lubricating oil  JUKI New Defrix Oil No.2 (equivalent to ISO VG32)
Sewing machine motor  450W compact AC servomotor (direct-drive system)
Power consumption  250VA
Weight  Machine head (include motor) 42kg, Control box 5.6kg