To achieve maintenance-free and wear-resistance of a link mechanism and to constitute a mold suspending part in a convenient cost by connecting connecting bars and carrying bodies, through leaf spring joints movable with carrying frames.

A supporting frame is provided with each one of the carrying frame 2 and two carrying bodies 1 fixed to the vertical directon and the connecting bars 3 which is connected with the carrying body 1 at the one side and the carrying body 2 at the other side in joint state and arranged at mutually upper and lower positions in the horizontal direction in pair-state. Carrying arms are formed with a vertical supporting body 5 and a cantilever beam 4 to hold the mold. The connecting bars 3 in the horizontal direction provided with the leaf sprig joints 20 for connecting the carrying body with the supporting body are arranged between each carrying body 1 and the supporting body 5 in the vertical direction. The free ends of the leaf spring joints 20, 20' are inserted into slits 14, 14' in the horizontal direction with a fastening connection which can be formed with screw connecting parts 13, and fixed.