The JUKI LK-1940 Series is a next-generation computer-controlled shape-tacking machine designed for applications requiring high strength, precision, and consistent quality. With a 60 mm × 100 mm sewing field and JUKI’s advanced full-rotary 3-fold capacity hook, it ensures stable sewing with thick thread while minimizing bobbin replacement frequency. The series includes specialized models for seatbelts (Z), heavy-weight materials (H) and extra heavy-weight materials (G). Electronic Feeding System – Easy Pattern Change The newly developed electronic feed mechanism allows the operator to select sewing patterns instantly without changing mechanical feed cams. This eliminates cam replacement, reduces setup time, and significantly lowers maintenance cost. Optimized for Heavy & Extra Heavy-Weight Applications High-Power Direct-Drive Motor Provides stronger needle penetration and higher torque for sewing dense materials such as: Seatbelts Safety harnesses Load-bearing straps Industrial webbing Thick synthetic thread operations High-Torque Stepping Motor Increases feeding efficiency for tough materials, reduces feed slippage, and improves stitch accuracy. Pneumatic Work Clamp Provides stronger clamping force to prevent material movement during tacking. Work clamp lift: up to 25 mm for easy handling of bulky or rigid assemblies. Unique Heat Cutter System (Z Models / 5050 Versions) The LK-1941ZA and LK-1942ZA/5050 use a needle/bobbin thread separate cutting method engineered specifically for seatbelt sewing. Benefits: Reliable trimming of thick threads No thread slippage Remaining thread length ≤ 5 mm No thread debris left on hot wire Prevents interference with clamp and moving parts Adjustable hot-wire temperature The heat cutter trims both needle and bobbin thread under the throat plate, ensuring smooth and consistent operation even at high speeds. Improved Seam Quality JUKI’s full-rotary 3-fold hook ensures stable thread tightening and reduced bobbin change frequency—ideal for thicker synthetic threads (#30–#1). Additional quality systems include: Needle thread feeding device (pre-feeds thread for bonding thread operations) Semi-rotary tension (higher tension for tough threads) Specialized needle hole guide for seatbelts (Z type) High-Speed, High-Efficiency Performance Maximum sewing speed: 2,200 sti/min Thread trimming speed: as fast as 0.3 seconds Stable trimming even with thick synthetic thread Reduced vibration and noise thanks to direct-drive architecture Advanced Detection & Safety Functions (ZA/5050 Models) To ensure zero-defect production, the ZA/5050 model includes: Bobbin thread detector (prevents sewing with no bobbin thread) Stitch-skipping detector (avoids defective products) Incorrect bobbin insertion detector (prevents damage) Ease of Use & Operator Convenience Hand pulley on the machine head for needle entry adjustment Lower pulley for hook timing adjustment Direct-drive system eliminates stop-motion parts & reduces noise Optional PGM-7B programming device allows easy pattern creation and editing