Jack Sewing Machines · Interlock

Every fabric.
One smooth feed.

Seven interlock machines, led by the AI-driven K7, built to carry hems, waistbands and cover seams across thick, thin, elastic and slippery fabrics without ever slowing the line down.

14 Years World No.1 · Flagship Interlock

Full speed,
across the full range of fabric.

K7's AI Full-Speed Feeding System senses fabric thickness changes in real time, letting Smart Rhino fabric feeding and 0-degree thread technology work together so the machine keeps sewing at full speed through thick, thin, elastic or slippery material and every change in between.

  • Smart Rhino fabric feeding: 9.2Nm torque, precise control at every 1° interval
  • 0-degree thread technology: 30% less thread path resistance, 80% better loop stability
  • Comprehensive per-unit efficiency improved by 11%+
  • Configurable for plain seaming, hem folding and elastic attaching
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Jack K7 AI interlock machine
6000 spmMax speed
9.2NmFeed torque
3–5Needles
+11%Efficiency
K7-UT-01GB
Basic plain seaming
K7-UT-35AC
Hem folding, left cutter
K7-UT2-33AC
Elastic attach, tubular fabric
K7-UTL series
Pneumatic trimmer variants
More Interlock Machines

Six more feeds, dialed in.

From feed-up-the-arm cylinder beds to multi-needle waistbanding and curved-arm jointing, each machine below covers a specific stage of garment assembly.

Jack JK-1500E-UT interlock machine
Interlock
JK-1500E-UT
Feed-up-the-arm 280mm space

High-speed, feed-up-the-arm cylinder-bed interlock with auto trimmer and auto foot lifter, built for hemming, strip attaching and joint seaming in one head.

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Jack JK-8009VCDII multi-needle interlock machine
Interlock
JK-8009VCDII
Up to 25 needles Waistband

High-speed computerized multi-needle machine for elastic attaching, shirt fronting, tape attaching and waistbands, with auto presser-foot lift and auto trimming.

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Jack JK-8670G-UT small cylinder-bed interlock machine
Interlock
JK-8670G-UT
Baby cuffs Anti-winding

Small cylinder-bed computerized interlock for baby-cuff sewing, with 180mm gesture-free operation and CAM anti-winding for smooth, even stitching.

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Jack JK-8740C curved-arm jointing machine
Interlock
JK-8740C
4-needle 6-thread Curved arm

Four-needle, six-thread jointing machine with a curved arm and fragment-type presser foot, built for sportswear, swimwear and wetsuit seams.

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Jack JK-8787-UT square head interlock machine
Interlock
JK-8787-UT
Square head Direct drive

Small square-head computer sewing machine with an improved bottom-line crossing group and electromagnetic direct-drive presser-foot lift.

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Jack W5E flatbed interlock machine
Interlock
W5E
Knits & lace 7mm lift

Stepping flatbed high-speed interlock with presser lift raised to 7mm for a stronger cross-thick ability, tuned for knitted fabrics, mesh, lace and intimate apparel.

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