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Title:
SAWING MACHINE FOR CUTTING BLOCKS OF STONE MATERIAL WITH A CONVEYOR BELT PROVIDED WITH A CLAMP FOR CLAMPING THE BLOCK OF STONE
Document Type and Number:
WIPO Patent Application WO/2020/109844
Kind Code:
A1
Abstract:
The present invention relates to a sawing machine (1) which comprises at least one stationary element (8) arranged vertically on the conveyor belt (2) to allow the block of material (3) to be cut to rest against it, and at least one mechanical locking element (9) consisting of a main body (15) adapted to be removably, transversely disposed to the conveying direction of the conveyor belt (2) at said stationary element (8), and adapted to move from a first rest position in which the locking element (9) is not in contact with the block of material (3) to be cut at a second operating position in which said locking element (9) presses said block of material (3) to be cut against said stationary element (8). In this way, the blocks of material (3) to be cut are clamped between the stationary element (8) and the locking element (9) until the cutting station is reached; the locking element (9) can be positioned on the conveyor belt (2) and removed from it each time the cutting operation of a block of material (3) is completed and that a new block of material (3) to be cut is to be locked.

Inventors:
NICOLETTI LAURA (IT)
BALDESSARI CLAUDIO (IT)
Application Number:
PCT/IB2018/059414
Publication Date:
June 04, 2020
Filing Date:
November 28, 2018
Export Citation:
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Assignee:
MEC S R L (IT)
International Classes:
B28D7/04; B23D47/04; B28D1/04
Foreign References:
US20030172916A12003-09-18
EP1103359A12001-05-30
Attorney, Agent or Firm:
CACCIAMANI, Clizia (IT)
Download PDF:
Claims:
Claims.

1. Sawing machine (1) for cutting blocks of material (3) of natural stone and/or concrete, wherein said machine (1) comprises at least one motorized conveyor belt (2), which defines a cutting path suitable for receiving in succession said blocks of material (3) to be cut and transporting them from a first inlet station (4) to a second outlet station (5), and wherein said machine (1) further comprises at least one cutting device (6) each consisting of a motor on whose axis a circular blade (7) is keyed, said at least one cutting device (6) being constrained to said sawing machine (1) and being arranged above the cutting path defined by the belt transporter (2) with respect to a vertical direction so that the respective circular blades (7) lie within the cutting path itself; characterized in that said sawing machine (1) further comprises: a) at least one stationary element (8) arranged vertically on the conveyor belt (2) suitable for allowing the block of material (3) to be cut to rest against it (8), and b) at least one mechanical locking element (9) consisting of a main body (15) arranged to be removably, transversely disposed to the conveying direction of the conveyor belt (2) at said stationary element (8), and passing from a first rest position in which the blocking element (9) is not in contact with the block of material (3) to be cut to a second operative position in which said blocking element (9) presses said block of material (3) to be cut against said stationary element (8).

2. Sawing machine (1) according to claim 1, wherein said stationary element (8) is arranged at an edge of said conveyor belt (2) or is an element which contributes to form an edge of the conveyor belt (2) itself.

3. Sawing machine (1) according to any one of the preceding claims, wherein said conveyor belt (2) consists of a series of modular strips (10) placed adjacent one to the other, transversely to the conveying direction of said conveyor belt conveyor belt (2). 4. Sawing machine (1) according to claim 3, wherein the main body of said locking element (9) can be removably fixed to one of said strips (10).

5. Sawing machine (1) according to claim 4, wherein the main body of said blocking element (9) is able to slide along the edges of said strip (10) transversely arranged to the conveying direction of the conveyor belt (2) ) so as to overlap at least partially with said strip (10).

6. Sawing machine (1) according to any one of the previous claims, wherein said blocking element (9) is provided with a partially deformable covering (11) facing said stationary element (8) so that, when said blocking element (9) is in said second operating position, said deformable covering (11) is substantially adapted to the profile of the block of material (3) to be cut stuck between said stationary element (8) and said blocking element (9).

7. Sawing machine (1) according to any one of the previous claims, wherein said main body (15) of the blocking element (9) is provided with a rod (12) longitudinally arranged along it and able to rotate from a first blocking position, wherein said rod (12) has a first serrated profile adapted to fix said blocking element (9) to said strip (10) of the conveyor belt (2), to a second unlocking position wherein said rod (12) has a second smooth profile which is adapted to free the blocking element (9) from said strip (10) of the conveyor belt (2).

8. Sawing machine (1) according to any one of the previous claims, wherein said blocking element (9) is adapted to be fixed at a desired distance from said stationary element (8), according to the dimensions of the block of material (3) to be cut.

9. Sawing machine (1) according to any one of the previous claims, which further comprises an unlocking element (13) of a mechanical type of said rod (12), such as for example a hook or a pin (13), adapted to allow the rotation of said rod (12) so as to allow it to pass from said first blocking position on the strip (10) of the conveyor belt (2) to said second release position.

10. Sawing machine (1) according to claim 9, which further comprises a release system adapted to mechanically allow the removal of said removable locking element (9) from said strip (10) of the conveyor belt (2) once that said rod (12) assumes said second release position, wherein said release system consists of a rotating bush (14) vertically arranged on said blocking element (9) and a directional bar (17) which engages with said rotating bushing (14) and acting as a guide to allow said release device (9) to gradually come out of said strip (10) of the conveyor belt (2), where the directional bar (17) is an integral part of a fixed structure (18) placed along the conveyor belt (2), beyond the last cutting station (6) provided in the sawing machine (1) in the direction of the conveyor belt (2).

Description:
SAWING MACHINE FOR CUTTING BLOCKS OF STONE MATERIAL WITH A CONVEYOR BELT PROVIDED WITH A CLAMP FOR CLAMPING THE BLOCK OF STONE

DESCRIPTION

Field of the invention

The present invention relates to a sawing machine for cutting irregularly shaped materials of varying dimensions. In particular, the present invention refers to a sawing machine capable of blocking a block of marble, porphyry, granite and similar materials, of irregular shape and of variable dimensions to be subjected to a cutting action. The present invention also refers to a method for blocking and subsequently releasing a block of material to be subjected to a cutting operation which uses said sawing machine.

State of art.

Sawing machines are known for cutting blocks of stone, marble, granite and similar stone materials, or of concrete shapes made with special cement molds, in order to realize surface coating elements.

Typically, such sawing machines comprise at least one longitudinally extending conveyor belt and defines a cutting path along which a plurality of cutting devices are arranged in succession. The cutting devices are for example constituted by a motor, for example an electric motor, on whose axis a circular blade is keyed, typically a diamond disc. The circular blades are aligned with respect to the cutting path in order to define a line for cutting the blocks. An example of a sawing machine of this type is provided by the patent publication EP 1103359 Al.

However, at present, the sawing machines available on the market have the disadvantage that, once placed on the conveyor belt, some stones, in particular those with a rounded, oval shape or in any case able to roll and move in an unwanted way along the conveyor belt, tend not to be stable at the cutting station, thus resulting in a cutting operation without the required accuracy.

Some solutions to this problem may include electrically operated devices for blocking the cutting stones: however, this solution has the disadvantage of having to provide the presence of electric cables along the whole conveyor belt of the sawing machine, with consequent problems of encumbrance and safety, also due to the presence of water inside the sawing machine.

Another solution is provided by means of pneumatically operated cutting blocking devices; also this solution has some disadvantages, such as that of having to manage the conductor to guarantee a certain working pressure along the whole belt length, with relative major maintenance problems.

Therefore, the Applicant of the present patent application has found the need to realize a sawing machine which allows to obviate the aforementioned drawbacks, so that the material to be cut, once loaded onto the conveyor belt, can be blocked and transported until when the cutting station is efficiently and safely reached.

Summary of the Invention

According to a first aspect, the present invention relates to a sawing machine like the one indicated in claim 1.

The present invention arises from the general consideration according to which the above-mentioned technical problem can be effectively and reliably solved by means of a sawing machine for cutting blocks of natural and/or concrete stone, in which said machine comprises at least one motorized conveyor belt, which defines a cutting path adapted to receive in succession said blocks of material to be cut and to transport them from a first entry station to a second output station, and wherein said machine further comprises at least one cutting device each constituted by a motor on whose axis a circular blade is keyed, said at least one cutting device being constrained to said machine and being arranged above the cutting path defined by the conveyor belt with respect to a vertical direction so that the respective circular blades are inside the cutting path itself; characterized in that said sawing machine further comprises: a) at least one stationary element vertically arranged on the conveyor belt to allow the block of material to be cut to rest against it, and b) at least one mechanical blocking element constituted by a main body arranged to be removably, transversely disposed with respect to the conveying belt conveyor direction in correspondence with said stationary element, and adapted to move from a first rest position wherein the blocking element is not in contact with the block of material to be cut to a second operative position in which said blocking element presses said block of material to be cut against said stationary element.

In this way, the blocks of material to be cut, in particular those of rounded, oval shape, or in any case able to roll and unwantedly move along the conveyor belt, are locked between the stationary element and the blocking element until the cutting station is reached or, if there are several cutting stations arranged in succession along the conveyor belt, until the last cutting station following the conveyor belt conveyor direction is reached.

Moreover, thanks to the fact that it is removable, the blocking element can be positioned on the conveyor belt and removed from it each time the cutting operation of a block of material is completed and that it is necessary to lock a new block of material to cut. Thus, the problems of sawing machine overall dimensions are solved; in fact, by removing the blocking device each time the cutting operation is completed, it is prevented from continuing to follow the movement of the conveyor belt, in particular in its return portion, where the presence of thick elements is not foreseen (the blocks of material have been cut and removed), the structure of the sawing machine foresees a minimum thickness suitable to allow the simple sliding of the conveyor belt. Vice versa, the presence of the blocking element also in the return part of the conveyor belt would force the sawing machine manufacturers to envisage large size measurements, with consequent problems of costs, spaces, maintenance, etc.

According to a preferred embodiment, said conveyor belt is constituted by a series of modular strips arranged adjacent one each other, transversely with respect to the conveying direction of said conveyor belt.

In this way, the strips, side by side, constitute said conveyor belt, and allow to lengthen and/or shorten the conveyor belt according to the requirements, respectively adding and/or removing an appropriate number of strips.

According to a preferred embodiment, each of said strips is provided with a further vertical portion, placed substantially at 90° with respect to the part which contributes to form the conveyor belt, so that said vertical portion contributes to constitute the edge of the conveyor belt.

According to a preferred embodiment, said stationary element is arranged at an edge of said conveyor belt or consists of said further vertical portion of a strip.

In this way, the stationary element arranged along the edge of the conveyor belt allows the block of material to be cut to settle against this edge or against said vertical portion of the strip and, consequently, to occupy all the necessary space transversely with respect to the direction of conveyor belt transport.

According to a preferred embodiment, the main body of said locking element can be removably fixed to one of said strips constituting the conveyor belt. According to a preferred embodiment, the main body of said blocking element is adapted to slide along the edges of said strip transversely arranged with respect to the conveying direction of the conveyor belt so as to overlap at least partially with said strip.

Thus, the insertion/removal of the blocking element on/from the board is facilitated.

According to a preferred embodiment, said blocking element is provided with a partially deformable covering facing said stationary element so that, when said locking element is in said second operating position, said coating is substantially adapted to the profile of the block of material to be cut stuck between said stationary element and said blocking element.

In this way, whatever the profile of the stone block to be cut kept locked in pressure between the stationary element and the blocking element, said coating is able to assume the shape of the surface part of the block to be cut which is facing towards the blocking element. According to a preferred embodiment, said main body of the blocking element is provided with a longitudinally rod arranged along it and able to rotate from a first locking position, wherein said rod has a first serrated profile adapted to fix said locking element to said strip of the conveyor belt, to a second release position in which said rod has a second smooth profile which is adapted to free the blocking element from said strip of the conveyor belt. In this way, the presence of the serrated part in the rod allows the locking element to firmly anchor itself to the strip forming the conveyor belt.

According to a preferred embodiment, said blocking element is adapted to be fixed at a desired distance from said stationary element, according to the dimensions of the stone block to be cut.

In fact, depending on the size of the stone block to be cut, the rod is slid towards the stationary element by a certain number of clicks between one tooth and the other of the serrated profile until reaching the desired distance for blocking the stone to cut. According to a preferred embodiment, said sawing machine further comprises a mechanical unlocking element of said rod, such as for example a hook or a pin, adapted to allow rotation of said rod so as to allow said rod to pass from said first locking position on the strip of the conveyor belt to said second release position.

In this way, when the element to be cut has already been subjected to the cutting action, and therefore it is no longer necessary to keep the block of stone locked between the stationary element and the blocking element, the hook or pin rotates the rod in such a way as to free the locking device which contains this rod from the engagement with the conveyor belt.

According to a preferred embodiment, said sawing machine further comprises a release system adapted to mechanically allow the removal of said blocking element removable from said strip of the conveyor belt, once said blocking element has been freed from the engagement with the conveyor belt by, for example, the hook or the pin which drives the rod as seen above.

According to a preferred embodiment, said release system consists of a rotating bushing vertically positioned on said blocking element and a directional bar which engages with said rotating bushing and which acts as a guide for allowing said release device to progressively come off from said strip of the conveyor belt, where said directional bar is preferably an integral part of a fixed structure placed along the conveyor belt, beyond the last cutting station provided in the sawing machine in the direction of the conveyor belt.

In this way, once the locking device has been freed from the engagement with the strip of the conveyor belt, it can be removed from the strip itself, thanks to the fact that the conveyor belt continues its movement along the transport direction and the rotating bush on the blocking device, now unlocked, allows the directional bar to slide tangentially around the bushing, until the blocking device is completely removed from the strip.

According to a preferred embodiment, the blocking device, once removed following the completion of a cutting operation of a stone, can be positioned again on a strip of the conveyor belt and fixed thereto to block a new stone to be cut. Further characteristics and advantages of the present invention will be better highlighted by examining the following detailed description of a preferred but not exclusive embodiment, illustrated by way of non-limiting example, with the support of the attached drawings, wherein:

- Figure 1 is an overall view of an embodiment of a sawing machine according to the present invention;

- Figure 2 is a detail of Figure 1, wherein one of the strips which contributes to forming the conveyor belt of the sawing machine is shown;

- Figure 3 is a detail of Figure 1, wherein a blocking element of the sawing machine is shown;

- Figure 4 is a side view of the block element of Figure 3; - Figure 5 is a sectional view of Figure 4;

- Figure 6 is a detail of Figure 5;

- Figures 7a, 7b, 7c show the release of the blocking element from the strip of the conveyor belt in three successive stages.

Detailed description of the invention.

With reference to Fig. 1-7, an embodiment of a sawing machine 1 according to the present invention is shown below.

Fig. 1 shows an overall view of a sawing machine 1 for cutting blocks of natural and/or concrete stone material 3, in particular those with a rounded, oval shape or anyway able to roll and move in an unwanted manner along the conveyor belt, as better shown in Fig. 7c, where a motorized conveyor belt 2 is visible, which receives the material to be cut 3 and transports it from a first input station 4 to a second output station 5.

Along the conveyor belt 2 some cutting devices 6 are arranged, each of which is provided with a motor (not shown in the figures) on the axis of which a circular blade is keyed 7. The cutting devices 6 are arranged above the cutting path defined by the conveyor belt 2 with respect to a vertical direction, so that the respective circular blades 7 lie within the cutting path itself.

In the highlighted part of Figure 1, a series of modular strips 10 (better visible in Fig. 2), placed adjacent one another to form the conveyor belt 2, the stationary element 8 vertically arranged on a strip 10 of the conveyor belt 2 and the blocking element 9 are also visible in greater detail; the block of material 3 to be cut is blocked between the stationary element 8 and the blocking element 9.

The stationary element 8 is arranged perpendicularly to the strip 10, so as to form a support edge against which the block of material 3 to be cut is in abutment. In the embodiment shown in Fig. 1 and 2, the stationary element 8 is therefore an integral part of the strip 10 and each strip 10 is provided with such a stationary element 8. The conveyor belt 2 thus consists of a series of stationary elements 8, one corresponding to each strip 10, such as to form a continuous bearing surface against which the block of material 3 to be cut can settle.

In other embodiments of the present invention (not shown in the figures), the stationary element 8 may not be an integral part of a strip 10, but simply be a support surface placed at the terminal part of the strip 10.

Figure 3 shows in detail an embodiment of the mechanical locking element 9 of the present invention. It has an elongated main body 15, adapted to be arranged transversely with respect to the conveying direction of the conveyor belt 2, and substantially of the same shape as the strip 10 so as to be able to be wound thereon. The main body 15 of the blocking element 9 has at its ends a slightly arched profile 16 which acts as a guide for facilitating the sliding of the blocking element 9 on the strip 10.

The blocking element 9 is therefore able to slide on the strip 10, passing from a first rest position in which it is not in contact with the block of material 3 to be cut to a second operating position in which the blocking element 9 press the block of material 3 to be cut against the stationary element 8. Moreover, the blocking element 9 is provided with a partially deformable covering 11 facing towards the stationary element 8. In this way, when the blocking element 9 is in the second operating position in contact with the block of material 3 to be cut the deformable coating 11 adapts to the profile of the block of material 3 to be cut stuck between said stationary element 8 and the blocking element 9, improving the grip on the element to be cut 3. Figures 4-6 show the block element 9 in a side view and in section, highlighting the rod 12 arranged longitudinally along it and the serrated profile which allows the rod 12 to act as a standstill and block the locking device 9 on the strip 10. The distance from the stationary element 8 can be adjusted according to the requirements (in particular according the overall dimensions of the stone 3 to be cut) by sliding the serrated profile of the rod until reaching the optimum point where the blocking element 9 must be locked to the strip 10.

Once the material 3 to be cut is blocked between the stationary element 8 and the blocking element 9, the conveyor belt 2 is slid so as to bring the block of material 3 to be cut at the first cutting station 6 provided with blades 7. Depending on requirements, several cuts may be required (Figure 1 shows two cutting stations 6, each provided with blades 7, but the number of cutting stations is irrelevant, it may vary from 1 to 5, or even more).

Once the required cutting operations have been completed, it is possible to free the locking device 9 from the strip 10. This operation is mechanically carried out.

In fact, the rod 12 is first freed by turning it through the pin 13 provided in correspondence with the main body 15 of the locking element 9. The rotation of the rod 12 causes the serrated profile of the rod gripping the strip 10 to be rotated and replaced in that position by a smooth profile, which then frees the blocking element 9 from the strip 10.

At this point (when the blocking element 9 is no longer bound to the strip 10) it is possible to remove the blocking element 9 from the strip 10 using a mechanical release system, consisting of a rotating bush 16 arranged vertically on the main body 15 of the blocking element 9 and a directional bar 17, as shown progressively in detail in Figures 7a, 7b, 7c. The directional bar 17 is an integral part of a fixed structure 18 located along the conveyor belt 2, beyond the last cutting station 6 provided in the sawing machine 1, on the opposite side of the stationary element 8 (see Figure 1). The directional bar 17 allows the locking element to be removed only when it is no longer necessary to keep blocked the material to be cut 3, since, beyond the last cutting station 6 in the conveying direction of the conveyor belt 2, the block of material 3 has already been cut. The directional bar 17 engages with the rotating bush 16 sliding tangentially around it. In fact, thanks to the fact that the conveyor belt 2 continues its movement along the transport direction beyond the fixed structure 18 on which the directional bar 17 is pivoted, the rotatable bush 16 allows the directional bar 17 to start sliding around it (Figure 7a), starting the consequent removal of the block element 9 from the strip 10, away from the stationary element 8, then proceeding with the extraction with a further removal from the stationary element 8 (Figure 7b), until the blocking device 9 is completely removed from strip 10 (Figure 7c).

Once the blocking device 9 has been removed from the strip 10, it can be positioned again on another strip 10 of the conveyor belt 2 and fixed thereto to block a new stone to be cut 3 and repeat the cycle described above.

Naturally, many modifications and variations of the preferred embodiment described above will be evident to those skilled in the art, still remaining within the scope of the invention.

Therefore, the present invention is not limited to the preferred embodiment described, illustrated only by way of non-limiting example, but is defined by the following claims.