Classifications

• • 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
  • B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
  • B23D55/04—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts of devices for feeding or clamping work
• • 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
  • B23D53/00—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting
  • B23D53/06—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting with shiftable or swinging work-table

Definitions

• the present invention relates to a sawing machine, particularly a band sawing machine according to the preamble to the main claim. Technological background
• the invention is for use, particularly but not exclusively, in the field of the mass production of wooden products with shaped profiles.
• the templates are usually made of wood, they are liable to deform over time and have to be remade.
• band sawing machines have recently been developed in which the cutting path is defined by translation means which are subject to numerical control and which can move the workpiece-carriage towards the blade in a direction resulting from a combination of perpendicular translational components (a process known as "cross movement").
• twisting means also subject to numerical control, with the saw blade.
• These twisting means act on the blade by twisting it about its own longitudinal axis so as to keep it always coplanar with the cutting axis.
• the first disadvantage is that, in order not to meet with the "slipping-off" feared in connection with the previous solution, the blade has to be driven at reduced speed, giving rise to cutting of unsatisfactory quality.
• the problem underlying the present invention is that of providing a sawing machine, particularly a band sawing machine, which is designed structurally and functionally to overcome the limitations set out above with reference to the prior art mentioned.
• FIG. 1 is a schematic side elevational view of a band sawing machine formed in accordance with the present invention
• - Figure 2 is a schematic front elevational view of the sawing machine of Figure 1
• FIG. 3 is a schematic plan view of a variant of the sawing machine of the previous drawings.
• the sawing machine 1 comprises a cutting unit 2 including a band-type blade 3 for cutting wooden planks and boards, and a loading unit 4 on which planks and boards are supported, guided, and supplied to the unit 2 during cutting.
• the blade 3 extends around two pulleys 5 in an endless loop, defining a path along which it is moved by drive means 6.
• a substantially vertical working portion 7, in which the blade 3 is used for cutting is also identified in the working path.
• a cutting axis X associated with the serrated edge of the blade 3, and an axis A of movement of the blade substantially perpendicular to the cutting axis X.
• the loading unit 4 comprises a base 10 on which a workpiece-carriage 11 is mounted so as to be movable along a plane substantially perpendicular to the movement axis A.
• the loading unit 4 comprises first translation means 12 which can translate the workpiece-carriage 11 substantially parallel to the cutting axis X and second translation means 13 which can translate the workpiece-carriage 11 along an axis Y perpendicular thereto.
• the first translation means 12 comprise a rack device 12a and the second translation means 13 comprise a ball screw with an adjustable precision nut.
• the first translation means 12 are arranged to move the workpiece-carriage 11 along the axis X with a total travel of about three metres, whereas the total movement which can potentially be performed along the axis Y by the second translation means 13 is about 0.8 metres.
• Loading means 15 are mounted on the workpiece-carriage 11 for moving the plank 14 towards the front edge 11 b at the beginning of each cutting stage.
• the loading means 15 also serve to restrain the plank 14 on the surface 11a during the above-mentioned cutting stage.
• pivoting means 16 are associated with the workpiece-carriage 11 and can pivot the workpiece- carriage 11 about an axis B which is stationary relative to the carriage and substantially parallel to the axis of movement A of the blade 3.
• the pivoting means 16 are arranged in the vicinity of the front edge 11 b so that the pivot axis B is as close as possible to the axis of movement A of the blade 3.
• the sawing machine 1 also comprises first sensor means 18 for detecting the coordinates of the position of the workpiece-carriage 11 along the axes X and
• the operator By interacting with the control unit 17, the operator sets the desired cutting profile, amongst other operative parameters, by entering the data relating to the profile, or by selecting it from curves which are present in the data bank of the control unit 17.
• the plank 14 is then placed on the surface 11a, restrained by the loading means 15, and moved forwards thereby towards the front edge 1 1 b of the workpiece-carriage 1 1.
• the workpiece-carriage 1 1 is then moved towards the blade 3 by the translation means 12, 13 and by the pivoting means 16. All of these movements are controlled by the control unit 17 which breaks down the cutting profile set by the operator into a combination of translational movements along the axes X and
• the actual cutting profile is compared with the theoretical profile by the control unit 17, by means of the data relating to the positioning of the workpiece- carriage 11 , transmitted by the sensor means 18 and 19. These data are also processed by the control unit 17 to define the subsequent movements of the translation means 12, 13 and/or of the pivoting means 16.
• the pivoting of the workpiece-carriage 11 about the axis B is performed in a manner such that, at every moment of the cutting stage, the blade 3 is in a position tangential to the profile of cutting of the plank 14.
• the workpiece-carriage 11 Upon completion of the cutting stage, the workpiece-carriage 11 is returned to the starting position and the plank 14 is moved a predefined distance towards the front edge 11 b by the loading means 15, ready for the next cutting stage.
• FIG. 3 shows a variant of the machine of the preceding drawings, Identical details are marked by the same reference numerals.
• the machine of the variant of Figure 3 differs from the preceding embodiment solely in that, beside the cutting unit 2, it has a routing unit 30 with a vertical axis, with one or more motor-driven routing cutters 31 disposed at a known distance from the cutting path of the blade 3.
• the plank 14 is thus brought in front of the routing unit 30 by the loading unit 4 for an optional routing operation (for example, to form patterns and/or mouldings on the visible face of the workpiece), in which the cutting movement is produced by the rotation of the routing cutters and the forward movement is generated by the translation means 12, 13, by the loading means 15, and by the pivoting means 16. All of the movements are subject to the numerical control unit 17.
• the plank 14 is then brought back to the cutting unit, where the pre- processed workpiece is cut and separated from the plank.
• the present invention thus solves the problem discussed above with reference to the prior art mentioned, at the same time offering many further advantages, amongst which is the ability to drive the blade with a speed of movement fast enough to ensure good cutting quality.
• the direction of cutting of the blade is never changed, whatever profile is being cut.
• a further advantage is that, at least in theory, there are no limits to the pivoting of the workpiece-carriage relative to the saw blade. This permits the production of a large range of wooden articles with curved profiles.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Sawing (AREA)
• Insulation, Fastening Of Motor, Generator Windings (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

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Family Cites Families (6)

• 2001
  • 2001-06-04 IT ITPD20010129 patent/ITPD20010129A1/it unknown
• 2002
  • 2002-06-04 WO PCT/IT2002/000365 patent/WO2002098620A2/en not_active Application Discontinuation
  • 2002-06-04 AU AU2002345267A patent/AU2002345267A1/en not_active Abandoned
  • 2002-06-04 EP EP02743629A patent/EP1395400A2/de not_active Withdrawn

Non-Patent Citations (1)

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