An apparatus for cutting slabs made of porcelain or like materials includes a support and blocking plane of at least a slab, and at least a cutting group of the slab, arranged superiorly thereof. The cutting group includes rotary tools associated with a carriage mobile along a parallel direction to the support plane; a component for moving the rotary tools independently of one another, in a perpendicular direction to the parallel direction, between two end positions, respectively an active neared position for working on the slab and a non-active distanced position, raised from the slab.

A cutter head includes: a support platform; a double curved surface member mounted on the support platform and having a first curved surface and a second curved surface; a cutter wheel support member and a roller wheel support member moveably mounted on the support platform, respectively; a cutter wheel and a roller wheel mounted on the cutter wheel support member and the roller wheel support member, respectively; a first transmission mechanism mounted on the support platform, configured to be mated with the first curved surface, and connected to the cutter wheel support member, so as to transmit a movement of the double curved surface member to the cutter wheel; and a second transmission mechanism mounted on the support platform, configured to be mated with the second curved surface, and connected to the roller wheel support member, so as to transmit a movement of the double curved surface member to the roller wheel. The cutter head has a compact structure, and it improves the levelness of the cutter wheel and the roller wheel, and increases the mechanical precision.

A scribing apparatus 1 includes a horizontal table 3 on which a glass plate 2 is placed and fixed under vacuum suction; a feed screw 5 and a Y-axis control motor 6 for moving the table 3 along a pair of guide rails 4 under scribe numerical control; a guide rail device body 7 installed above the table 3 along an X-axis direction; a carriage 8 mounted on the guide rail device body 7 so as to move in the X-axis direction while being guided; a feed screw and an X-axis control motor 9 for moving the carriage 8 in the X-axis direction under numerical control; and a scribe head 10 installed on the carriage 8.