Fuente: WIPO "hemp" The utility model discloses a single-needle chain type lockstitch sewing machine for China-hemp jacquard blended fabric, which comprises a sewing table, a machine body, a needle pitch adjusting disc, a thread guide mechanism, a pressure regulator, a presser foot lifting switch, a presser foot lifting, a presser foot lifting table, an observation port and a dust removal device. When the interior of the connecting cylinder needs to be cleaned, a knob pulls a push rod through a rotating column, the push rod drives a rotating rod to rotate through a rotating shaft, and the connecting cylinder can move at the upper end of a sliding rail through a sliding block, so that the interior of the connecting cylinder can be cleaned; the rotating rod drives the clamping frame to loosen the connecting column, so that the square frame is taken down from the cylinder body, and then cleaning is realized, so that dust entering the respiratory tract is reduced, the respiratory tract is prevented from lesion, the health of a sewing person is ensured to a certain extent, and the convenience of the device is improved.