a drive device that provides torque to the drive shaft; a first link provided on one side of the drive shaft; a driving arm having one end fixed to the driving shaft and the other end moving by rotation of the driving shaft; a first auxiliary link having one end rotatably connected to the other end of the driving arm; a second auxiliary link rotatably connected to a first point on the other side of the first link and the other end of the first auxiliary link; a second link disposed under the first link and rotatably connected to the second auxiliary link; and a third auxiliary link having one end rotatably connected to a second point spaced apart from the first point on the other side of the first link and the other end rotatably connected to the second link.
展开▼
