The Jack JK-W4D Series (including W4-UT Computerized & W4-D Direct Drive) is a high-speed, computerized flat-bed interlock (coverstitch) industrial sewing machine engineered for superior productivity on knitted and elastic fabrics. Designed with a smart integrated voice navigation guide, automatic upper/lower thread trimming, and an energy-saving direct drive motor, the Jack W4D increases production efficiency by up to 40% compared to conventional interlock machines. It features a multi-functional design capable of plain seaming, tape binding, cover stitching, and bottom hemming on light, medium, and heavy fabrics without fabric deformation or gathering.
Key Features
High Production Efficiency
Smart Voice Navigation System
4-in-1 Versatile Sewing Capability
Smooth Ridged Seam Capability
Efficient Leak-Free Oil Control
Automatic Upper & Lower Thread Trimmer
Technical Specifications
| Operation Type: Automatic / Computerized Direct Drive Interlock (Coverstitch) |
| Max Stitch Length: 1.5 mm – 4.5 mm (Up to 7.5 mm on large stitch models W4-D-23 Series) |
| Max Tack Stitches: Automatic Upper & Lower Thread Trimmer (UT Models) |
| Needle System: UY128GAS (11#–14#) |
| Max Speed: Up to 5,500 S.P.M. (Stitches Per Minute) |
| Application: T-Shirts, Underwear, Sportswear, Activewear, Knits (Plain Seam, Tape Binding, Cover Stitching, Bottom Hemming) |
| Bed Type: Flat-Bed Interlock Machine (Short Distance Sewing Bed Design) |
| Hook Type: High-Precision Multi-Looper Chainstitch System |
| Lubrication: Sealed Automatic Oil Control System (Efficient Leak Prevention) |
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