The Jack C7-4 is a new-generation, super high-speed digital overlock machine capable of reaching 7,000 RPM. Designed for professional sewing of light to medium-weight materials such as cotton, knits, polyester, nylon, sheer fabrics, and denim, it combines advanced automation, precision, and user-friendly features.
Key features include:
Super High-Speed & Industry 4.0 Ready: Achieves 7,000 stitches per minute with record acceleration and deceleration. The integrated Wi-Fi module allows remote parameter adjustments and productivity monitoring via a dedicated app (Jack Gateway required for multiple machines).
Automatic Thickness Adjustment & Large Presser Foot Clearance: The feed dog automatically adapts to material thickness, allowing 8–12 layers of denim without damage. The presser foot lift space increased to 6.5 mm for versatile material handling.
Three Operation Modes: Manual mode for full control, semi-automatic mode with pedal operation and automatic cutting/foot lifting, and fully automatic mode using photocells for hands-free sewing.
Digital Presser Foot Lifter & Intelligent Material Recognition: One-button adjustment of presser foot and feed dog height with a controlled step motor. The machine senses material thickness in real time, adjusting speed and penetration force for smooth seams.
Voice Guide & Short Thread Cutting: Built-in voice guide helps users learn functions and troubleshoot errors. Automatic short thread cutting to 5 mm at the start and end of seams saves time and reduces material waste.
Noise Reduction & User Comfort: Step motors reduce operational noise to 75 dB at 6,000 RPM, with quieter cutting and foot lifting for a comfortable work environment.
Technical Specifications: Needle system DCx27 #11, 2 needles, 4 threads, needle spacing 2 mm, stitch width 2×4 mm, stitch length 0.8–4.6 mm, differential ratio 0.7–2 mm, presser foot lift 6 mm, maximum speed 7,000 SPM.
The Jack C7-4 combines precision, speed, and intelligent automation, making it ideal for modern garment production including blouses, shirts, uniforms, lingerie, and denim wear.
