| 摘要 |
PURPOSE:To enable saving of a labor, by a method wherein a gantry type stone grinding device and a gantry type stone turning-over device are situated in juxtaposition at a distance therebetween, common rails are installed in the two devices, and a truck tracted by a winch is reciprocatively run. CONSTITUTION:A truck 21, on which a square stone 22 is loaded, is tracted by a winch to be conveyed in a gantry type stone grinding device, and the upper surface of the stone is roughly and final-finishing-grounded by a grinding head. Thereafter, the stone is conveyed in a gantry type turning-over device, a stone position is detected by photoelectric tube detecting means 29 and 29', a pair of grasping means 27 and 27' are lowered to nip the stone in positions situated laterally opposite to each other, the stone 22 is lifted up once to rotate it properly, with other surface up, the stone is lowered, it is placed on the truck 21 again, and is conveyed to the gantry type stone grinding device again. Through automatic repetition of the motion, multisurface grinding finish of the square stone 22 can be continuously executed. This constitution enables saving of a labor and improvement of productivity.
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