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Characteristics: This series is a kind of sewing machine for thick materials. which is designed for large-scale and extra-thick objects especially. The products are divided into three types of sewing machines including double—needle, single-needle left-side stitching bed (L) and single-needle right-side stitching bed(N). The sewing machine, driven by large power servomotor, adopts long-arm post-bed type and comprehensive feeding with large vertical shuttle hook. It possesses the following advantages: stable and strong feeding, smooth and nice stitch, wide operating space and easy sewing for multilayer extra-thick materials. It is also equipped with pneumatic presser lifting device with large presser stroke and pneumatic backstitch equipment with convenient and easy operation. At the same time. high-performance servo control system can select and set various sewing modes conveniently. This kind of sewing machine is especially applicable for large-scale and extra-thick materials such as tent, sails, umbrella, covers for automobile, protective cover, camouflage net and so on.