✅Multifunctional, electronic controlled and programmed buttonhole machine, driven by AC servo motor, with features such as low vibration, low noise. High efficiency and excellent sewing quality. ✅Machine is equipped with electronic thread tension device to avoid thread breakage, ✅Drop thread when start sewing and makes perfect stitch. ✅Modern technology provides limited to minimum lubrication (that prevents the formation of spots on the sewing products). ✅The cooling fan greatly lowers the temperature of motor, lengthens the lifetime of the machine. ✅LED lamp for lighting of working field is standard. ✅Maximum speed can reach 4200 RPM. ✅For light and medium fabrics. ✅JACK Buttonholing machine JK-T1790G is equipped with a readable control panel, that makes new patterns easy to update. ✅Max. 200 patterns can be saved on the operation panel or update by USB port. **Automatic functions:** - presser foot lifter - thread trimmer - sewing speed regulation - multi-cutting system – can make buttonhole of any length, without changing the knife. **Technical parameters:** - maximum sewing speed: 4200 stitches / min - buttonhole length: - 6.4 – 25.4 mm with the standard work clamp - 6.4 – 31.8 mm optional (additional equipment) - bartacking width max. 5mm - power supply: 230V