A conveyor system including a crank arm having a base end portion rotatably supported by a second support axle and a free end portion rotatably supporting a suspended supporting apparatus, and a swinging arm having a base end portion fixed to a first support axle and a front end portion coupled to an intermediate position of the crank arm. A movable bearing stand supporting the second support axle is provided to be movable toward and away from a fixed bearing stand supporting the first support axle. Further, a suspended section parallel link mechanism of a suspended supporting apparatus is so configured that a free end support axle is located above a line connecting suspension pins at both ends of an upper frame.