Industrial Lockstitch Machine LK-1903CST311/BR35SDK

JUKI LK-1903CST311/BR35SDK — Industrial Computer-Controlled High-Speed Direct-Drive Dry-Head Lockstitch Button Sewing System with Automatic Feeder for Small Buttons & Medium-Weight Materials

What Sets LK-1903CST311/BR35SDK Apart

• Integrated Control Box and LCD Panel for Compact Digital Setup
  The control box is built into the head and paired with a standard upright LCD panel mounted on the side, giving operators direct access to settings without looking away from the sewing area. The system comes with 50 standard patterns and memory for up to 999 patterns / 500,000 stitches, while keeping the table surface clear.
  
  
• USB Port for Easy Data Management
  The standard LCD panel comes with a USB port that lets technicians back up and transfer sewing data and update software directly at the machine, simplifying pattern management across multiple heads.
  
  
• Optional NFC Terminal for Wireless Setup Sharing
  With the optional NFC (Near Field Communication) terminal installed, sewing data can be exchanged wirelessly with a compatible Android device using JUKI’s app. This optional add-on allows quick, contactless copying of pre-set programs between machines, reducing the time needed to standardize settings on a group of button stations.
  
  
• Active Electronic Thread Tension for Consistent Finish
  An active tension mechanism sets needle-thread tension on the panel to match different sewing conditions (thread, material, speed), stores those values in memory and reproduces them automatically. Tension can be defined separately for the start, middle and end of the seam, helping keep button appearance uniform.
  
  
• Needle Thread Grasping for Clean Start Knots
  A needle thread grasping mechanism holds the thread at the beginning of sewing to form consistent knots at the start of each button. This supports neat, repeatable seam appearance from the very first stitches.
• Stepping-Motor Auto-Lifter for Faster Positioning
  A standard stepping-motor auto-lifter raises and lowers the work clamp in one or two steps, with an intermediate stop height programmable on the panel. Clamp lift can be set up to 11 mm, making placement and repositioning of garments quicker and less demanding for the operator.
  
  
• Adjustable Sewing Start Point for Accurate Button Positioning
  The sewing start point can be moved in the X and Y directions from the operation panel, so the first needle drop is aligned exactly where it is needed. This lets you fine-tune button position electronically instead of modifying the clamp or jig.
  
• Dry-Head Design for Reduced Oil Staining
  The needle-bar and thread take-up area run without frame lubrication, so there is no oil circulating around the fabric side of the head. Only a small, controlled amount of clean oil is fed from the internal tank to the hook, which greatly lowers the risk of lubricant marks on finished garments.
• Direct-Drive Head for Lower Noise and Vibration
  The head is driven directly by a compact AC servomotor with no drive belt, which reduces vibration and operating noise. This makes the workstation more comfortable to use and helps operators maintain control during long button-sewing runs.
• Adjustable LED Hand Light for Lower Eye Fatigue
  The built-in LED hand light offers two colors (white and warm tone), five brightness levels and 10-step dimming. This lets operators tune the lighting to fabric and workstation conditions, helping reduce eye strain during long shifts.
  
• 2,700 Stitches per Minute for Shorter Cycles
  The head sews at up to 2,700 stitches per minute, with starting, stopping, thread trimming and automatic presser lifting all tuned for speed, which together helps significantly reduce total cycle time per button.

Included Components

• BR35 Automatic Button Feeder
  

  Supplied as part of this configuration, the BR35 unit uses a horizontal forced-feed mechanism to position each small button (≈10–15 mm) automatically, so operators only set the fabric and press the pedal. A separate control panel manages feeder operation and has an alarm lamp that activates if a problem is detected. Three feed modes are available:

  • Automatic Supply Mode – The machine and button feeder work as one. The operator presses the pedal, the button is sewn, the thread is trimmed, and the feeder automatically positions the next button. The cycle repeats continuously, keeping the operation in a smooth, automatic rhythm.

  • Mode for Individual – Feeder is disabled and the head operates as a standard button-sewing machine for manual or special jobs.

  • Mode for Small Lots – Similar to automatic mode, but optimized for smaller quantities by discharging the required number of buttons from the index and sewing them automatically.

  
  
  

How It Improves Your Workflow

• Higher Output per Station
  Computer-controlled sewing at up to 2,700 stitches/min, automatic presser lifting (up to 11 mm), and the automatic feeder mode turn small-button attachment into a continuous cycle, so one station can process more pieces in the same shift time.

• Consistent Quality Across Operators and Styles
  Active tension, the needle thread grasping mechanism, adjustable sewing start point, and the BR35’s forced button feed for small flat buttons work together to keep button location, knot formation and stitch appearance stable, even when styles or operators change.

• Faster Style Changeovers and Easier Standardization
  The integrated memory stores 50 standard patterns and up to 999 programs / 500,000 stitches, while the USB port lets technicians move settings between machines in minutes. New styles can be brought to the same standard without reworking jigs.

• Lower Operator Fatigue and Smoother Shifts
  The auto-lifter handles clamp movement in one or two steps, the button feeder removes manual button setting, the direct-drive AC servomotor cuts noise and vibration, and the LED hand light offers two colors and multiple brightness levels. Together these features reduce repetitive handling and strain, making long runs more sustainable for the team.

• Less Rework and Disruption from Staining or Feeder Issues
  Dry-head design with minute-quantity hook lubrication lowers the risk of oil marks on garments, while the button feeder's dedicated control panel and alarm lamp flag feeder problems immediately. Issues are easier to catch and fix early, which helps avoid quality complaints and unscheduled downtime.

Who Benefits Most

✓ Shirt and Blouse Manufacturers – business and casual shirts, blouses, knit and woven tops with buttoned fronts, cuffs, collars and sleeve tabs

✓Dress, Skirt and Fashion Apparel Producers – woven dresses, skirts and coordinated outfits where small flat buttons are used for closures or decorative rows on medium-weight fabrics

✓Uniform and Light Workwear Lines – medium-weight uniform shirts, tunics and light work tops for corporate, hospitality, healthcare and service applications

✓Home Textiles and Fabric Accessories Makers – cushion covers, duvet sets, fabric bags and other medium-weight textile items that rely on small flat buttons for functional or decorative fastening