Abstract: A dressing board having, on a surface, a two-dimensional code including information relating to properties of the dressing board and a barcode including identification information associated with the information relating to the properties is provided. Furthermore, there is provided a cutting apparatus including a determining part that determines whether or not the properties of the dressing board read out from an information registration part based on the identification information match the kind of dressing board suitable for dressing of a cutting blade.

Abstract: An endless abrasive belt for a sanding machine includes a flexible support structure, on an upper side of the support structure, an active layer with a binder and abrasive grains held in the binder. A transponder device is affixed to an underside of the endless abrasive belt, the transponder device including an attachment region and a flag, the attachment region being glued onto the underside by an adhesive layer, the flag being held by the attachment region and projecting laterally away from the endless abrasive belt, and a transponder including a transponder chip and an aerial for a wireless data connection with the sanding machine is arranged in the flag.

Abstract: The present disclosure relates to polishing pads which include a polishing layer, a porous substrate and an interfacial region. The present disclosure relates to a method of making the polishing pads. The present disclosure relates to a method of polishing a substrate, the method of polishing including: providing a polishing pad according to any one of the previous polishing pads; providing a substrate, contacting the working surface of the polishing pad with the substrate surface, moving the polishing pad and the substrate relative to one another while maintaining contact between the working surface of the polishing pad and the substrate surface, wherein polishing is conducted in the presence of a polishing solution.

Abstract: A doctor blade (100), in particular for doctoring off printing ink from an impression cylinder, comprises a doctor blade body (110) with a working edge (130) and a first doctor blade side (122) which faces the impression cylinder, in particular, during operation, and a second doctor blade side (121) which faces away from the impression cylinder, in particular, during operation. The doctor blade body (110) is provided with a coating (150) which comprises a polymer, wherein the coating (150) comprises particles (160) at least in one part region. The particles (160) are configured as hard material particles (160), and a mass proportion of the hard material particles (160) in the coating (150) on the first doctor blade side (122) is higher than a mass proportion of the hard material particles (160) in the coating (150) on the second doctor blade side (121).

Abstract: A belt sharpener comprises a drive pulley, a belt tensioner, a contact roller, an idler pulley and an endless abrasive belt mounted for rotation between them. The belt sharpener also includes a primary and a secondary guides adapted to hold a blade at a desired angle with respect to the abrasive belt.

Abstract: A flexible display production apparatus of the present disclosure includes: a stage (520) for supporting a flexible display supporting substrate (10), the flexible display supporting substrate including a glass base (11) and a synthetic resin film (12) provided on the glass base; a polisher head (535) configured to approach a selected region of a surface (12s) of the synthetic resin film (12) and polish the region so that a polish recess (12c) is formed in the surface (12s); and a repair head (536) for supplying a liquid material (20a) to the polish recess (12c) formed in the surface (12s) of the synthetic resin film (12) and heating the liquid material (20a), thereby forming a sintered layer (20) from the liquid material (20a).

Abstract: The polishing apparatus has: a polishing pad that has a polishing surface to polish a semiconductor wafer; a polishing table to which a back surface of the polishing pad on an opposite side of the polishing surface can be attached; a top ring that is opposed to the polishing surface, and can hold the semiconductor wafer; and an eddy current sensor that is arranged in the polishing table, and detects an end point of polishing. The polishing table has on an attachment surface a projection member projecting from the attachment surface to which the polishing pad is attached. The back surface of the polishing pad has a concave portion in a portion opposed to the projection member, and at least a part of the eddy current sensor is arranged inside the projection member.

Abstract: The present invention provides methods for cleaning the surface of CMP polishing pads comprising blowing a stream or curtain of forced air or gas from a source onto the surface of a CMP polishing pad substrate at a pressure of from 170 kPa (24.66 psig) to 600 kPa (87 psig), towards a vacuum source, the forced air or gas blowing at an angle of from 6 to 15° from a vertical plane which lies normal to the surface of the substrate, traverses the entire width of the surface of the substrate, and passes through the source of the forced air or gas, while, at the same time conveying along a horizontal plane the CMP polishing pad so that the entire surface of the CMP polishing pad surface is exposed to the forced air or gas at least one time; and, vacuuming the surface of the CMP polishing pad at a point on the surface which is downstream from a point at which the stream curtain of forced air or gas contacts the surface of the CMP polishing pad.

Abstract: A polishing apparatus is used for polishing a substrate such as a semiconductor wafer. The polishing apparatus includes a substrate holder to hold a substrate and to rotate the substrate, a pressing member configured to press a polishing tool against the substrate and to polish the substrate, a pressing force control mechanism configured to control a pressing force of the pressing member, and a polishing position limiting mechanism configured to limit a polishing position of the pressing member. A polishing tape or a fixed abrasive is used as the polishing tool.

Abstract: A method of making a gas separation membrane system by providing a porous support material having deposited thereon a metal membrane layer and imposing upon the surface thereof certain surface characteristics that provide for surface activation that enhances the placement thereon of a subsequent metal membrane layer. The gas separation membrane system is useful in the separation of hydrogen from hydrogen-containing gas streams.

Abstract: A method for shortening one or more rotor blade(s) (2) of a turbomachine (3) by removal of material at the blade tip, and apparatus (1;19) for carrying out the method: a belt grinding apparatus (1;19) shortens the rotor blades (2) and a contour of the blade tip is generated by a relative movement of the blade tip along the static belt.

Abstract: The present invention provides a method of cutting a workpiece efficiently with high accuracy by utilizing tension adjusters to approximate tension in a wire in a wire saw to a predetermined target tension while effectively reducing only tension in a winder-side wire. The method comprises a forward-driven cutting step of cutting a workpiece while moving a wire forward, a first switching step of reversing a driving direction of the wire, a backward-driven cutting step of cutting the workpiece while moving the wire backward, and a second switching step of reversing a driving direction of the wire and returning to the forward-driven cutting step, the steps being repeated in this order. In both switching steps, only tension in a winder-side wire is reduced by tension manipulators. A reduction in target wire tension therefor is performed after completion of deceleration of the wire in each switching step.

Abstract: The present invention provides a surface processing system for a work piece in the mechanical technical field. The system comprises at least one group of polishing units. A manipulator and several polishers with different polishing precisions are provided on the polishing units. The polishers are arranged around the manipulator in turn. The work piece could be moved by the manipulator between the processing center and the polishing units. The machined work piece is loaded by the manipulator for one time when the manipulator is located at the processing center. When the manipulator is located at the polishing units, the manipulator keeps holding the work piece and transfers the work piece in a preset sequence to each polisher corresponding to the polishing unit where the manipulator is located. The surface of work pieces having different wall thicknesses and complex surfaces could be processed in a large batch with a high efficiency.

Abstract: Apparatus for removing remnants of debris from the exterior surface of cores includes an assembly moveable from a position spaced from the exterior surface of the cores to a position adjacent the exterior surface. One or more abrasion belts are looped around rotatable shafts which move the belts to abrade the exterior surface of the cores.

Abstract: A method of polishing a peripheral portion of a substrate is provided. This method includes: causing sliding contact between the peripheral portion of the substrate and a polishing tape; and supplying a polishing liquid onto the polishing tape contacting the peripheral portion of the substrate. The polishing tape includes a base tape and a fixed abrasive formed on the base tape, and the polishing liquid is an alkaline polishing liquid containing an alkaline chemical and an additive including molecules that cause steric hindrance.

Abstract: The present invention provides a wire saw which cuts a workpiece using a cutting wire and is capable of adjusting wire tension with high responsiveness. The wire saw includes first and second workpiece cutting units 1A and 1B. Each of the workpiece cutting units 1A and 1B includes a pair of guide rollers 10a and 10b around which a wire W is wound to form a workpiece-cutting wire group. The wire saw further includes a tension detector 18 which detects tension in the wire W between the workpiece cutting units 1A and 1B, and a control device 50. The control device 50 changes a rotational speed of the guide rollers 10a and 10b of at least one of the workpiece cutting units based on the tension detected by the tension detector 18 so as to keep the tension within an acceptable range.

Abstract: In a continuous grinding machine for grinding the surface of flat workpieces (20) with at least one grinding station and a transport device (10) for moving the workpieces (20) relative to the grinding station, the grinding station having at least one grinding assembly (22) with a grinding belt (26) and a pressure device (34) for pressing the grinding belt (26) against the workpiece surface, and with a control device (38) for controlling the pressure device (34) depending on the workpiece contour, the transport device (10) is reversible with respect to its feed direction and the control device (38) has means (36) for detecting the workpiece contour depending on the feed direction.

Abstract: Method and apparatus for sharpening a cutting tool. In some embodiments, an abrasive endless belt is rotated in tension along a neutral plane between spaced apart first and second rollers. A guide assembly has spaced apart first and second guide surfaces which collectively converge to an intervening base surface to form a guide channel. Upon insertion of a blade of a cutting tool into the guide channel, a selected side of the blade contactingly slides against at least a selected one of the first or second guide surfaces and a first portion of a cutting edge of the blade contactingly engages the base surface to serve as a plunge depth limit stop for the blade. The endless belt is contactingly deflected by a second portion of the cutting edge away from the neutral plane to sharpen the second portion while the first portion remains in contact with the base surface.

Abstract: The invention relates to an adjustable belt sander, comprising a continuous sanding belt (11) and a sanding module (4), which supports the sanding belt in the sanding region and has a profiled guide surface which faces the sanding belt back and represents a rounding radius to be sanded, wherein the sanding module has a disk shape, is mounted centrally rotatably about a pivot pin (5) on a main body (3) arranged transversely to the sanding direction and at the peripheral profile has at least two quadrant circle contours having different radii, which determine the respective guide surface for the sanding belt.

Abstract: Method (300) and apparatus (100) for sharpening a cutting tool (114, 132, 204, 210, 216). A flexible abrasive belt (116, 116A, 116B, 162, 172) with a selected linear stiffness and an abrasive surface (128A, 128B) of selected abrasiveness level is driven (304) in a selected direction along a selected plane between a first support (122) and a second support (118). In some embodiments, the cutting tool is presented (306, 308) in contacting engagement against the abrasive surface to induce torsion of the belt (140, 144, 148) out of the selected plane to conform to a cutting edge (138, 168, 178, 207, 208, 213, 214, 215) of the cutting tool. In further embodiments, presentation of the cutting tool against the abrasive surface of the belt (306, 308) induces bending of the belt out of said selected plane at a radius of curvature (169, 179) determined in relation to said linear stiffness to shape a side surface (164, 166, 174, 176) of the cutting tool with said radius of curvature.

Abstract: Embodiments of the disclosure provide a saw chain having a pitch in the range of approximately 0.440 to approximately 0.450. Embodiments also include tie straps and/or other components having fluid distribution features.

Abstract: A glass edge finishing system, a belt assembly and a method are described herein for finishing an edge of a glass sheet. The glass edge finishing system comprises: (a) a base; and (b) one or more belt assemblies located on the base, where each belt assembly includes: (i) a support frame; (ii) a motor; (iii) a pair of pulleys rotatably mounted on the support frame and driven by the motor; (iv) a belt engaged to and driven by the pair of pulleys, where the belt contacts and finishes the edge of the glass sheet; (v) a belt cleaning device that removes glass debris from the belt as the belt moves past the belt cleaning device; and (vi) a cleaning containment enclosure within which there is located the belt cleaning device, where the cleaning containment enclosure contains the glass debris removed from the belt by the belt cleaning device.

Abstract: A system for performing a polishing operation on a component is disclosed, the system comprising a robot, a fixture, a mount system for attaching the fixture to a robotic arm and a drive system mounted on the fixture for driving a polishing tool such that the location of the point of contact of the polishing tool with respect to the component is maintained constant during the polishing operation.

Abstract: A polishing apparatus polishes a periphery (a bevel portion, a notch portion, an edge-cut portion) of a substrate by bringing a polishing tool into sliding contact with the periphery of the substrate. The polishing apparatus includes a substrate holder configured to hold the substrate, and a polishing head configured to polish the periphery of the substrate held by the substrate holder using the polishing tool. The polishing head includes a press pad for pressing the polishing tool against the periphery of the substrate, and a linear motor configured to reciprocate the press pad.

Abstract: The method relates to the manufacture of a reinforced diamond-coated cable for cutting structures and materials of steel, concrete, steel and concrete, stone materials or the like, in which such diamond-coated cable comprises a plurality of outer strands (101) of metal material such as steel or the like wound in a helix around an inner central strand (201) and a series of sheaths (2) inserted along such outer strands (101) and having on their external profiles (202) projecting members of strongly abrasive materials such as industrial diamonds or the like.

Abstract: Embodiments of the disclosure provide an aggregate cutting saw chain having a pitch in the range of approximately 0.440 to approximately 0.450. Embodiments also include tie straps and/or other components having fluid distribution features.

Abstract: The invention relates to an orbital apparatus (20) for machining of a revolution metallic wall, of the type comprising a fixed annular plate (30) coaxially mounted on a universal support and having a peripheral annular electric collector (35) and an annular plate (50) rotationally mobile and coaxially mounted on the fixed annular plate (30). The mobile annular plate (50) carries a set of electrical contacts (55) cooperating with the electrical collector (35), means (60) for rotationally driving the plate (50), means (70) for machining the metallic wall and pneumatic feeder means (80) to apply and maintain the machining means (70) on the metallic wall.

Abstract: The present invention relates a grinding device 1 for the machine-based grinding of rotor blades 100 for wind energy systems, comprising a belt grinding unit 10 with a circulating grinding belt 12.

Abstract: An apparatus for machining a planar metal workpiece, having at least one machining unit, with which a machining belt, which is driven in circulation, can be guided in an at least approximately linear manner past the region of the workpiece to be machined in an oblique or transverse manner with respect to a feed direction of the workpiece. A movable carrier element having pressure means acts on a rear side of the machining belt in order to influence contact, necessary for machining, between the working side of the machining belt and the workpiece. A drive arrangement, by way of which the carrier element can be motor-driven, is provided such that the carrier element moves substantially parallel to the direction of movement of the machining belt, at least in the working region of the machining belt.

Abstract: A belt sander includes a housing and an endless sanding belt supported by the housing. A first shaft is connected to the housing, and the housing is pivotable about the first shaft. A second shaft is connected to the housing and offset from the first shaft. The sander is mounted to the rotating portion of a rotary machining clam shell trackway and revolved around a pipe surface to be sanded while biasing the sander against the surface. The sander may also be pivotable to sand a tapered surface.

Abstract: The polishing apparatus has a polishing unit capable of forming a right-angled cross section by polishing a peripheral portion of the substrate. The polishing unit includes a polishing head having a pressing member configured to press a polishing tape against the peripheral portion of the substrate from above, a tape supply and recovery mechanism configured to supply the polishing tape to the polishing head and to recover the polishing tape from the polishing head, a first moving mechanism configured to move the polishing head in a radial direction of the substrate, and a second moving mechanism configured to move the tape supply and recovery mechanism in the radial direction of the substrate. The guide rollers are arranged such that the polishing tape extends parallel to a tangential direction of the substrate and a polishing surface of the polishing tape is parallel to a surface of the substrate.

Abstract: The present invention is a slicing method and a wire saw apparatus including winding a wire around a plurality of grooved rollers and pressing the wire against an ingot to be sliced into wafers while supplying a slurry for slicing to the grooved rollers and causing the wire to travel in a reciprocating direction, in which the ingot is sliced with controlling a temperature of the ingot by supplying a slurry for adjusting an ingot temperature to the ingot independently from the slurry for slicing while the slurry for adjusting an ingot temperature is supplied to the ingot only at the exit side of the wire caused to travel in the reciprocating direction. As a result, there is provided a method and a wire saw apparatus in which rapid cooling of an ingot especially in a time close to end of slicing of the ingot can be alleviated, consequently degradation of a nano-topography can be suppressed, and further high-quality wafers having a uniform thickness can be sliced when slicing the ingot by using a wire saw.

Abstract: Disclosed herein is a wafer polishing device including: an abrasive member driving device adapted to run a belt-like abrasive member in a direction crossing an outer circumferential end-edge of a wafer which is a wafer to be polished while bringing a belt-like abrasive member into contact with outer circumferential end-edge of the wafer, the abrasive member having non-abrasive sections disposed on both sides of an abrasive grain section; and a guide member having two guide surfaces shaped to conform to the outer circumferential end-edge of the wafer, the two guide surface being adapted to press, from rear sides of the non-abrasive sections, the respective non-abrasive sections of the abrasive member run by the abrasive member driving device.

Abstract: A glass edge finishing system, a belt assembly and a method are described herein for finishing an edge of a glass sheet. The glass edge finishing system comprises: (a) a base; and (b) one or more belt assemblies located on the base, where each belt assembly includes: (i) a support frame; (ii) a motor; (iii) a pair of pulleys rotatably mounted on the support frame and driven by the motor; (iv) a belt engaged to and driven by the pair of pulleys, where the belt contacts and finishes the edge of the glass sheet; (v) a belt cleaning device that removes glass debris from the belt as the belt moves past the belt cleaning device; and (vi) a cleaning containment enclosure within which there is located the belt cleaning device, where the cleaning containment enclosure contains the glass debris removed from the belt by the belt cleaning device.

Abstract: A swing device for a grinding machine includes a motor located on a fixed table beside the sanding unit which includes a frame with two mandrels and a sanding belt is mounted to the two mandrels. A movable member is movably mounted to the shaft of the motor so as to move back and forth to activate two limit switches which are activated to stop the motor. The movable member is connected to a fixed plate connected to an end plate on the sanding unit and a link is connected between the fixed plate and an elongate slot of the movable member. The sanding unit together with the sanding belt swing when the movable member moves. The sanding belt swings and activates two micro switches to change the rotation direction of the shaft. The sanding belt swings to change the sanding portion contacting the objects to be polished.

Abstract: An abrading device for abrading a floor structure comprises a first abrading assembly and a second abrading assembly. The first and second abrading assemblies each have a rotationally driven contact roll provided with a sleeve having a plurality of cutouts formed in a pattern thereon. An abrading belt is trained over the sleeve. A first oscillation assembly is connected to the first abrading assembly and oscillates the contact roll of the first abrading assembly in a first direction via a linear, reciprocating motion. A second oscillation assembly is connected to the second abrading assembly and oscillates the contact roll of the second abrading assembly in a second direction via a linear reciprocating motion. The first and second abrading assemblies consecutively abrade a top surface of the floor structure with the pattern formed by the cutouts on the respective sleeves to form a distressed visible pattern thereon.

Abstract: A finishing device for finishing a surface of a workpiece includes a finishing belt, and a guide unit for guiding the finishing belt. The guide unit has a cup-shaped guide surface which bounds a receiving zone for the workpiece and along which the finishing belt is guided or guidable between an entry zone and an exit zone. The guide unit includes at least two separate guide members which have each a surface area, with the surface areas of the guide members jointly defining the guide surface and being movable relative to one another.

Abstract: The invention relates to an adjustable belt sander, comprising a continuous sanding belt (11) and a sanding module (4), which supports the sanding belt in the sanding region and has a profiled guide surface which faces the sanding belt back and represents a rounding radius to be sanded, wherein the sanding module has a disk shape, is mounted centrally rotatably about a pivot pin (5) on a main body (3) arranged transversely to the sanding direction and at the peripheral profile has at least two quadrant circle contours having different radii, which determine the respective guide surface for the sanding belt.

Abstract: The disclosure relates to a finishing apparatus for finish machining of rotationally symmetric workpiece surfaces having a finish belt guide which has a guiding body for guiding the finish belt, wherein the guiding body comprises a shell-like guiding surface along which the finish belt can be guided or is guided between an insertion end of the finish belt and a withdrawal end of the finish belt, wherein the guiding surface is mounted in a resiliently elastic manner in the radial direction, wherein, when seen in the circumferential direction, the guiding surface extends in a continuous manner between the insertion end of the finish belt and the withdrawal end of the finish belt over at least a part of the width of said guiding surface and is mounted in a resiliently elastic manner.

Abstract: A protection device for a rope saw assembly (5) includes at least two, telescopically displaceable relative to each other, cover members (12, 13) having each a circular cross-section, an extending along a longitudinal axis receiving space (14) for the saw rope (8), and a longitudinally extending opened slot (15, 16), and provided each with a securing device (18, 20) located on one end (17, 19) of each of the cover members (12, 13) for securing a respective cover member (12, 13) to a respective deflection roller (6, 7) of the rope saw assembly (5).

Abstract: A belt sander is disclosed that may include a sanding assembly having a first roller and a second roller, the sanding assembly being configured to receive a sanding belt around the first roller and the second roller to define a sanding surface therebetweeen. The belt sander may include a motor operationally coupled to the sanding assembly and opposite the sanding surface, the motor being configured to rotate at least the first roller and thereby rotate the sanding belt around the first roller and the second roller, as well as a handgrip formed around at least a portion of the motor and substantially encasing the motor.

Abstract: Method (300) and apparatus (100) for sharpening a cutting tool (114, 132, 204, 210, 216). A flexible abrasive belt (116, 116A, 116B, 162, 172) with a selected linear stiffness and an abrasive surface (128A, 128B) of selected abrasiveness level is driven (304) in a selected direction along a selected plane between a first support (122) and a second support (118). In some embodiments, the cutting tool is presented (306, 308) in contacting engagement against the abrasive surface to induce torsion of the belt (140, 144, 148) out of the selected plane to conform to a cutting edge (138, 168,178,207, 208, 213, 214, 215) of the cutting tool. In further embodiments, presentation of the cutting tool against the abrasive surface of the belt (306, 308) induces bending of the belt out of said selected plane at a radius of curvature (169, 179) determined in relation to said linear stiffness to shape a side surface (164, 166, 174, 176) of the cutting tool with said radius of curvature.

Abstract: The invention describes a control unit for a sanding machine, which winds and unwinds the abradant paper over a contact device. This control unit continuously detects the position of one or more of these sanding machines, the abradant unwinding, the movement of the transport system and the position of the workpiece. These parameters are used to regulate the sanding machine(s) in such a way that the workpieces are fed through and the sanding operation executed without interruption.

Abstract: An electrodeposited wire tool has a core wire extending in a longitudinal direction, a plating layer provided on an outer peripheral surface of the core wire, superabrasive grains held by the plating layer and coating layers covering the outer peripheral surfaces of the superabrasive grains. The coating layers are constituted of electroless Ni—P platings. The coating layers are heat-treated, and the electroless Ni—P platings are partially or entirely crystallized.

Abstract: A deflection device for a rope saw assembly, includes a deflection roller (12; 52; 92); a stationary protective cover (13; 53, 93) surrounding art least some regions of the deflection roller (12; 52; 92); and at least one cover member (23; 63; 102, 103) pivotally arranged on the protective cover (13; 53, 93) surrounding at least some regions of the deflection roller, and displaceable along a path radially spaced from the axle (15; 55; 95) of the deflection roller (12; 52; 92).

Abstract: A belt sander is disclosed that may include a sanding assembly having a first roller and a second roller, the sanding assembly being configured to receive a sanding belt around the first roller and the second roller to define a sanding surface therebetweeen. The belt sander may include a motor operationally coupled to the sanding assembly and opposite the sanding surface, the motor being configured to rotate at least the first roller and thereby rotate the sanding belt around the first roller and the second roller, as well as a handgrip formed around at least a portion of the motor and substantially encasing the motor.

Abstract: A belt sander is disclosed that may include a sanding assembly having a first roller and a second roller, the sanding assembly being configured to receive a sanding belt around the first roller and the second roller to define a sanding surface therebetweeen. The belt sander may include a motor operationally coupled to the sanding assembly and opposite the sanding surface, the motor being configured to rotate at least the first roller and thereby rotate the sanding belt around the first roller and the second roller, as well as a handgrip formed around at least a portion of the motor and substantially encasing the motor.

Abstract: A belt sander is disclosed that may include a sanding assembly having a first roller and a second roller, the sanding assembly being configured to receive a sanding belt around the first roller and the second roller to define a sanding surface therebetween. The belt sander may include a motor operationally coupled to the sanding assembly and opposite the sanding surface, the motor being configured to rotate at least the first roller and thereby rotate the sanding belt around the first roller and the second roller, as well as a handgrip formed around at least a portion of the motor and substantially encasing the motor.

Abstract: A multi-head centerless belt grinder for removing material from a workpiece includes a common base and a plurality of grinding heads spaced apart from one another and mounted to the common base. Each grinding head includes a moveable work rest blade, a moveable regulating wheel and a moveable grinding belt positioned by servomotors to centerless grind the workpiece along a common axis of rotation. The grinder is programmable for rapid machine changeover and set-up typically within 2-5 minutes to accommodate a large range of workpiece diameters. This feature results in improved productivity and output as well as greater flexibility for scheduling numerous workpiece diameters within a normal eight-hour work shift. A trough may extend beneath and between each of the grinding heads to more efficiently collect and transfer grinding swarf generated during the grinding process to a filter operable to separate solids within the swarf from coolant.

Abstract: The sawing machine according to the invention comprises a double portal structure (11) with two pairs of uprights (11.1), along which slides a respective ram (13). The rams (13) bear four support shafts (15), superposed in pairs and each supporting a coaxial roller, respectively a plurality of coaxial pulleys (18), mutually juxtaposed in packet fashion, having coplanar races according to respective vertical planes. A shaft (15) rotates integrally with the respective roller, or with the respective packet of pulleys (18). The other rollers, or packets of pulleys (18) are idle. On sets of four coplanar races is wound a corresponding wire or cutting tool (19) in closed loop, to execute the cut in a corresponding vertical plane of a block of material (B).