PURPOSE: To smooth the movement of movable frames in a fast roller apron by interposing guide rollers between a stationary frame and the movable frames guiding an ingot.

CONSTITUTION: In a fast roller apron 1, guide rollers 8 which guide movable frames 4, 5 in a moving direction while rollably contacting the movable frames 4, 5 on the short side are mounted to a long side frame 3 located on the outer side of the radius of curvature of an ingot 6. The external force trying to deviate the frames 4, 5 to the outer side of the radius of curvature is born by these rollers 8. Thereby, the smooth movement of the frames 4, 5 guiding the ingot 6 is assured.