Three lazytongss of sewing machine

The utility model provides a three lazytongss of sewing machine, includes the upper shaft that upper end swing is connected before the casing needle bar swing span on the terminal surface, is set up in the casing and is connected with motor drive, and the casing inner tower is equipped with the presser foot oscillating axle, and presser foot oscillating axle parallel arrangement is the terminal surface before the side of upper shaft and head stretch out the casing, is equipped with crank link assembly between presser foot oscillating axle head and the needle bar swing span lower part, and presser foot change axle passes through crank link assembly drive needle bar swing span horizontal hunting. The utility model provides a three lazytongss of sewing machine, the presser foot oscillating axle that drives the motion of needle bar swing span be not under the upper shaft, but at the side of upper shaft, the operating space of casing becomes bigger like this, and the upper end of needle barswing span is fixed on t