Industrial Lockstitch Machine JUKI DLN-6390S

JUKI DLN-6390S — 1-Needle High-Speed Cylinder-Bed Needle-Feed Lockstitch Machine for Hemming on Denim and Heavy-Weight Fabrics with 1.7-Fold Capacity Hook

For hemming lines running jeans, work uniforms, and heavy casual pants at volume, the JUKI DLN-6390S provides both precision and reliability. The cylinder bed handles tubular parts with ease, the integrated binder holds the hem edge folded and aligned as the material feeds through, and the top-and-bottom roller feed with 35 mm needle bar stroke ensures clean stitch formation through multi-layered denim and reinforced seam sections. Automatic lubrication and a 1.7-fold capacity hook keep the machine running for longer without interventions. At up to 5,000 stitches per minute, it delivers hem quality that holds up to the output demands of a modern production.

What Sets the JUKI DLN-6390S Apart

• Narrow-Profile Cylinder Bed for Tubular Garment Access

The cylinder-bed geometry allows the machine to reach inside leg openings and other closed tubular sections. This turns bottom hemming on jeans or heavy workpants into a simple, efficient operation.

• Integrated Binder — Fold and Stitch in One Pass

The binder folds the hem edge as the material feeds through the machine, combining folding and stitching into a single cycle. Binder position is adjustable both longitudinally and laterally for precise hem alignment. On the DLN-6390S, the binder opens and closes simultaneously with the presser lifting action via the knee lifter, giving operators full control over the fold cycle without breaking sewing rhythm.

A knee lifter is supplied with the machine.

• Top-and-Bottom Roller Feed with 35 mm Needle Bar Stroke

The roller feed system drives all material layers at a consistent rate from both above and below, eliminating the layer slip that causes uneven hems and puckering on heavy denim and multi-panel sections. The 35 mm needle bar stroke ensures clean stitch formation where shorter-stroke machines lose consistency.

• 1.7-Fold Capacity Hook

The exclusive large-capacity hook carries significantly more thread than a standard hook, reducing bobbin change frequency on long runs and handling heavier thread weights reliably — critical for sustained hemming operations on heavy denim and thick workwear fabrics.

• Forced Circulation Lubrication with Full Oil Leakage Prevention

The lubrication system uses a forced circulation mechanism designed for reliable oiling across all critical components, including the hook. The frame and cylinder-bed sections are equipped with a dedicated circulation feature to prevent oil leakage, and a gasket fitted inside the frame seals the needle bar. The needle bar sliding mechanism is designed for high durability and is free of play. Together these reduce maintenance stops and protect mechanical consistency across long production runs.

• Low Presser Foot Pressure Sewing

The machine maintains material control at low presser foot pressure without allowing the material to flap, producing pucker-free hems even on sections where excessive pressure would distort the fabric or hem fold.

• Dial-Adjustable Feed Amount with Interchangeable Pitch Gears

The needle feed amount is adjustable via a scale dial, allowing operators to fine-tune feed for different material and thread combinations. Stitch length is configurable across seven settings from 2.1 mm to 4.2 mm using interchangeable pitch conversion gears.

How It Improves Your Workflow

• Fewer Hem Defects on Heavy Sections

Folding and stitching are handled in a single pass, removing the misalignment risk. Uneven hems and puckering on dense denim and multi-layer seam junctions are prevented mechanically — the roller feed and extended needle bar stroke eliminate the root causes, so defect rates on those sections drop consistently.

• Higher Output Per Operator Per Shift

At up to 5,000 stitches per minute with the binder handling the fold automatically and the knee lifter keeping cycle transitions fast, each operator produces more finished pieces in the same time without additional effort.

• Less Downtime Per Shift

The large-capacity hook reduces bobbin change frequency, and automatic lubrication eliminates manual oiling intervals. Both reduce planned stops that accumulate across a full production day.

• More Consistent Results Across Operators

Dial-adjustable feed and the binder mechanism reduce the skill dependency of the hemming operation. Results are more uniform across experience levels, which shortens training time and reduces shift-to-shift variation.

Who Benefits Most

✓Denim manufacturers — jeans, denim skirts, denim overalls 

✓Workwear and uniform producers — work trousers, coveralls, cargo pants in heavy cotton drill and canvas 

✓Casual and streetwear manufacturers — chinos, casual trousers and shorts in mid-to-heavy wovens