Apparatus for controlling and adjusting the tension of cutting wires in machine tools for stone materials.

摘要

Apparatus for controlling and adjusting the tension of a wire (1) of machine tools (10) for cutting stone materials (2), comprising at least two columns (11) each of which has mounted thereon a sliding member (12) displaceable in the vertical direction (Z-Z) from a top start-of-cut position to a bottom end-of-cut position and vice versa, at least one driving roller (13) and at least one transmission roller (14) being respectively mounted on each sliding member (12), the cutting wires (1) being endlessly wound around said rollers (13,14), and at least one pulley (131) for tensioning the cutting wire (1) in the longitudinal direction (X-X), which apparatus comprises a flange (100) which has a first axis of rotation on which said pulley for tensioning the wire (1) is mounted; a second axis of rotation (111) about which the flange is able to rotate from a "fully in" position of the pulley (131) into a "fully out" position of the pulley and vice versa; a third axis of rotation (121a) on which the rod (121) of a thrust cylinder (122) is hinged, said cylinder being in turn hinged on a fixed point (122a) of a support (125) fastened to the sliding member (12), said cylinder (122) being associated with a one-way discharge valve (123) able to keep the pressure of the cylinder constant upon variation in the angular position of the flange (100) during the downward cutting stroke.