Multi-wire frame for cutting blocks of stone material, comprising two columns (14, 16) each of which is provided with a slide (18, 20) designed to move along the respective column (14, 16), each slide (18, 20) being provided with at least one multi-groove drum (22, 24) designed to engage with a plurality of cutting wires between the two slides (18, 20); said multi-wire frame being provided with two multi-groove wire-guiding rollers (26, 28) which are designed to guide the wires along the cutting section; wherein the multi-wire frame comprises movement means for adjusting the distance between the multi-groove wire-guiding rollers (26, 28); and characterized in that the movement means are of the motorized type and comprise a mechanism of the motor-driven type which allows the movement of at least one of said multi-groove wire-guiding rollers (26, 28) towards or away the respective multi-groove drum (22, 24), at least one of said multi-groove wire-guiding rollers (26, 28) being provided with the motor-driven mechanism; and in that the movement of the wire-guiding roller (26, 28) occurs along a direction inclined downwards and the mechanism comprises: - a support structure fixed to the slide (18, 20); - two bars located on the two opposite sides of the wire-guiding roller (26, 28) and designed to slide inside corresponding seats provided in the support structure and supporting said wire-guiding roller (26, 28); the two bars being inclined downwards so that, when the bars are extracted, the angle of tangency of the wires with the wire-guiding roller remains constant and thus the winding arc also remains constant. each slide (18, 20) being provided with at least one multi-groove drum (22, 24) designed to engage with a plurality of cutting wires between the two slides (18, 20); said multi-wire frame being provided with two multi-groove wire-guiding rollers (26, 28) which are designed to guide the wires along the cutting section; wherein the multi-wire frame comprises movement means for adjusting the distance between the multi-groove wire-guiding rollers (26, 28); and characterized in that the movement means are of the motorized type and comprise a mechanism of the motor-driven type which allows the movement of at least one of said multi-groove wire-guiding rollers (26, 28) towards or away the respective multi-groove drum (22, 24), at least one of said multi-groove wire-guiding rollers (26, 28) being provided with the motor-driven mechanism; and in that the movement of the wire-guiding roller (26, 28) occurs along a direction inclined downwards and the mechanism comprises: - a support structure fixed to the slide (18, 20); - two bars located on the two opposite sides of the wire-guiding roller (26, 28) and designed to slide inside corresponding seats provided in the support structure and supporting said wire-guiding roller (26, 28); - a support structure fixed to the slide (18, 20); - two bars located on the two opposite sides of the wire-guiding roller (26, 28) and designed to slide inside corresponding seats provided in the support structure and supporting said wire-guiding roller (26, 28); the two bars being inclined downwards so that, when the bars are extracted, the angle of tangency of the wires with the wire-guiding roller remains constant and thus the winding arc also remains constant.