PURPOSE: To make automation possible by assuring the moving space of a working device on one side in the axial center direction of metallic molds and positioning an attaching and detaching device for front cover upward in the stage of replacing the front cover.

CONSTITUTION: A titled device consisting of a gate type frame 2 disposed movably in the axial center direction of metallic molds 1, an upward and downward moving frame 9 provided in the frame 2, and an attaching and detaching device 15 for front cover provided to the frame 9. The frame 2 encloses the extension space of the metallic molds 1 and the space above the same on one side in the axial direction of the metallic molds 1. The device 15 is made turnable between the horizontal position facing one end of the metallic molds 1 and the vertical position facing upward. The replacing work for the front cover is facilitated and automation is made possible by the above-mentioned device.