The invention discloses a
sewing machine provided with a thread passing device. The
sewing machine provided with the thread passing device comprises a
machine frame, a
sewing machine handpiece, a transmission mechanism controlling the handpiece to conduct sewing, the thread passing device and a plurality of fasteners. The sewing
machine handpiece and the transmission mechanism are arranged on the
machine frame, and the thread passing device is fixed to the sewing machine handpiece through the fasteners. The thread passing device comprises a support, a platen, a connecting plate, a plurality of locating columns, pressing sheets, pressing ring blocks, threading shafts and air cylinders, wherein the platen is arranged at the bottom of the support, the connecting plate is arranged below the platen, the locating columns are arranged on the platen, the pressing sheets are connected to the locating columns respectively, each pressing
ring block is arranged above the corresponding pressing sheet, each threading shaft is arranged between the corresponding pressing
ring block and the corresponding pressing sheet, the pressing ring blocks and the pressing sheets can both move in the length direction of the threading shafts, a first threading hole is formed in each threading shaft, the air cylinders are connected to the upper portions of the pressing ring blocks respectively, and the air cylinders are fixed to the support. According to the sewing machine provided with the thread passing device, the adopted air cylinders exert balanced and stable force, the thread knotting phenomenon is avoided, the production efficiency of the sewing machine is guarnteed, and the production cost is reduced.