Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H57/00—Guides for filamentary materials; Supports therefor
  • B65H57/14—Pulleys, rollers, or rotary bars
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D57/00—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00
  • B23D57/003—Sawing machines or sawing devices working with saw wires, characterised only by constructional features of particular parts
  • B23D57/0053—Sawing machines or sawing devices working with saw wires, characterised only by constructional features of particular parts of drives for saw wires; of wheel mountings; of wheels

Definitions

• This invention relates to a sawing machine for dividing blocks of stone material into slabs.
• PCT/EP 97/00709 discloses a sawing machine for dividing blocks of stone material into slabs.
• This sawing machine comprises a plurality of cutting tools each consisting of a metal cord member referred to for brevity in the rest of the text as a "cutting wire".
• the cutting wires are each wound in a closed loop and run between a driving pulley and a driven pulley and are maintained at a distance from each other by guide means which are distinct from the pulleys.
• Each cutting wire is disposed in its own e.g. vertical plane approximately parallel to the planes containing the adjacent cutting wires. The distance between adjacent cutting wires and, therefore, the thickness of the slabs cut by the said wires is therefore defined.
• the driving pulley has a flat rim - in other words its outer peripheral circumference has a smooth surface.
• the slab thickness considered here is that obtained on a finished slab, i.e. after removal from the cut slab of a superficial layer of material by grinding and/or polishing the slab.
• the thickness of this superficial layer of material may be, for instance, equal to one tenth of the said standard reference unit of measurement (i.e. approximately 1 mm) .
• a block of stone material is cut, simultaneously or successively, either into slabs whose thickness is equal to the standard reference unit of measurement plus the thickness of the superficial layer to be removed (10 mm + « 1 mm), or into other slabs whose thickness is equal to a whole multiple of this standard reference unit of measurement plus the thickness of the superficial layer to be removed (20 mm + a 1 mm; 30 mm + * 1 mm, and so on) .
• the primary object of the present invention is to provide a sawing machine, for dividing blocks of stone material into slabs, that will make it possible to simply and quickly change the thickness of the slabs to be cut and allow the cutting, simultaneously or otherwise, of slabs of different thicknesses which are defined in particular with reference to a standard reference unit of measurement.
• Another object is to provide a sawing machine as specified that will be safe and reliable in use, of simplified structure and easy to maintain.
• the present invention provides a sawing machine for dividing blocks of stone material into slabs, the essential feature of which forms the subject of the main claim.
• FIG. 1 shows, in axial section, an example of an embodiment of a guide pulley for the sawing machine according to the invention
• Fig. 2 is a detail view, on a larger scale, of the detail marked II in Fig. 1;
• - Fig. 3 is a side view on a larger scale of a length of cutting wire used with the pulley of Fig. 1;
• - Fig. 4 is a section on IV-IV as marked in Fig. 3;
• FIG. 5 to 7 are schematic views, similar to Fig. 2 but on a larger scale, illustrating three different operating arrangements of two cutting wires, as shown in Figures 3 and 4, in combination with the pulley shown in Figure 1.
• FIG. 1 is a general reference for a guide pulley with which the sawing machine is provided for dividing blocks of stone material into slabs according to the present invention (the rest of the machine is not illustrated here, but its general structure is known from the abovementioned international application PCT/EP 97/00709).
• the said pulley 10 comprises a wheel-like body
• the said annular rim 12 contains a plurality of external circumferential grooves 13, which in Fig. 1 are indicated schematically only, while in Fig. 2 they are shown in greater detail.
• the said annular rim 12 contains fifty-five circumferential grooves 13.
• Fig. 3 illustrates a length of cutting wire 20 which, when in use, is wound in an endless closed loop and run between a driving pulley and a driven pulley in the sawing machine according to the invention.
• a driving pulley and driven pulley is produced as the pulley 10 described above and each cutting wire 20 occupies its own groove 13 in this pulley.
• the said cutting wire 20 comprises a steel cord 21 formed from a plurality of helically wound metal strands with abrasive bushes 22 external to and coaxial with the cord 21 fixed to it at equal intervals (Fig. 4) .
• the said cord 21 is coated between the bushes 22 with a plastic sheath 23.
• n number of grooves 13 between the two adjacent cutting wires 20 performing the cutting of the slab, including the grooves 13 occupied by the said adjacent wires 20, and
• s' layer of material of slab to be removed after cutting by grinding and/or polishing, for example « 1 mm.
• two adjacent cutting wires 20 must each occupy an end groove 13 in an interval of three adjacent grooves 13 on the pulley 10, as illustrated in Fig. 5.
• two adjacent cutting wires 20 must each occupy an end groove 13 in an interval of four adjacent grooves 13 on the pulley 10, as illustrated in Fig. 6.
• the operator simply arranges two adjacent cutting wires 20 on the pulley 10 as illustrated in Fig. 7, that is to say, leaving three unoccupied grooves 13 between two cutting wires 20, arranged in respective grooves 13 either side of the said three unoccupied grooves.
• two adjacent cutting wires 20 are arranged on the pulley 10 as illustrated in Fig. 6 or Fig. 5, respectively, i.e. leaving two unoccupied grooves 13 or a single unoccupied groove 13 between the said cutting wires 20, which occupy respective grooves 13 either side of the said two unoccupied grooves 13 or single unoccupied groove 13.
• the operation of changing the thickness of the slabs to be cut can be carried out quickly and easily.
• the operator has simply to arrange the cutting wires 20 in the grooves 13 of the guide pulley 10, while his own intuition will prompt him to set, at the thickness selected for each slab to be cut, the number of grooves 13 to be left unoccupied between the adjacent cutting wires 20 performing the cutting of the slab.
• the pulley 10 provides constant and precise guidance of the cutting wires 20 in their respective cutting planes during the cutting operation.
• the guide pulley 10 may be separate from the driving pulley and/or from the driven pulley of the sawing machine according to the present invention.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Processing Of Stones Or Stones Resemblance Materials (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11415379

Family Applications (1)

Country Status (3)

Cited By (15)

Families Citing this family (1)

Citations (1)

• 1997
  • 1997-06-26 IT IT97TO000128 patent/IT236075Y1/it active IP Right Grant
• 1998
  • 1998-06-23 WO PCT/EP1998/003817 patent/WO1999000210A1/en active Application Filing
  • 1998-06-23 AU AU86293/98A patent/AU8629398A/en not_active Abandoned

Patent Citations (1)

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