WO2024009163A1

WO2024009163A1 - Slab cutting system

Info

Publication number: WO2024009163A1
Application number: PCT/IB2023/056330
Authority: WO
Inventors: Riccardo Sighinolfi
Original assignee: Raimondi S.P.A.
Priority date: 2022-07-08
Filing date: 2023-06-19
Publication date: 2024-01-11

Abstract

A slab cutting system (10) comprising: - at least one support (20) configured to rest on a slab (L) to be cut and provided with at least one sliding rail (212) developing along a longitudinal axis (A); - an engraving slider (50) provided with at least one engraving wheel (52) rotatable about an axis of rotation orthogonal to the longitudinal axis (A); wherein the engraving slider comprises a connecting body (55) that interconnects the engraving slider (50) and the sliding rail (212) for sliding the engraving slider (50) with respect to the sliding rail (212) along the longitudinal axis (A) thereof, wherein the connecting body (55) is configured to define a rubbing connection with the sliding rail (212).

Description

SLAB CUTTING SYSTEM

TECHNICAL FIELD

The present invention concerns the field of processing slab-like elements, preferably of large format, such as tiles, glass slabs or the like, generally made of fragile or brittle fracture material. In detail, embodiments of the present invention refer to a slab cutting system, such as for example ceramic slabs.

PRIOR ART

As is known, hard and brittle fracture materials such as ceramic or glass are widely used in the construction of buildings (for example, as surface coatings) or other artefacts. Such materials are usually produced in slabs of various sizes that can be cut to form formats other than the original one.

In the case of floor coverings or wall coverings, the use of ceramic materials for aesthetic reasons, for a good wear resistance and for easy maintenance thereof is widely widespread.

Alongside the most common tiles in ceramic material available in various standardized formats, the use of also large-format slabs (for example, with at least one dimension in the order of the metre), simply referred to as slabs below for brevity’s sake, has recently developed.

In detail, portions of desired length/width are obtained from a slab through cutting systems designed to perform a cut (or at least an engraving) of the slab itself.

Given the dimensions of the slabs to be cut, the cutting systems usually comprise a rectilinear longitudinal guide which is arranged on the surface of the slab to be subjected to cutting and an engraving slider movably coupled to the longitudinal guide is made to slide along the guide, while a cutting portion of the engraving slider is kept in contact with the surface of the slab. In this way it is possible to perform a long engraving along an engraving line on the slab, from which it is then possible to propagate the fragile fracture of the slab, for the separation thereof into various portions according to the needs.

A need felt in the sector is to make available a cutting system with excellent functional characteristics, but which can present a simplification of the components, such as the engraving slider or other, so as to be lighter, cheaper and more manageable.

In addition, a need felt is to make the cutting system adaptable to the various formats and/or configurations of slabs to be cut. An object of the present invention is to satisfy these and other needs of the prior art, within the framework of a simple, rational and low cost solution.

These objects are achieved by the features of the invention set forth in the independent claim. The dependent claims outline preferred and/or particularly advantageous aspects of the invention.

DISCLOSURE OF THE INVENTION

The invention particularly makes available a slab cutting system comprising:

- at least one support configured to rest on a slab to be cut and provided with at least one sliding rail developing along a longitudinal axis;

- an engraving slider provided with at least one engraving wheel rotatable about an axis of rotation orthogonal to the longitudinal axis; wherein the engraving slider comprises a connecting body (fixed rigidly, in a permanent manner or in a separable/removable manner with suitable releasable mechanical connections, to the engraving slider or integrated and/or in single body therewith) that interconnects the engraving slider and the sliding rail for sliding the engraving slider with respect to the sliding rail along the longitudinal axis thereof, wherein the connecting body is configured to define a rubbing connection with the sliding rail.

Thanks to this solution, it is possible to achieve the aforementioned purposes.

In particular, thanks to this configuration it is possible to achieve a simplification of the structure with the same functionality and, therefore, a saving in terms of costs and raw materials used.

Advantageously, the connecting body can interconnect the engraving slider and the single sliding rail, and wherein the connecting body defines a shape constraint with the single sliding rail configured to allow an axial sliding of the engraving slider along the longitudinal axis of the sliding rail and to prevent movements (i.e. translations) of the engraving slider in any direction orthogonal to the longitudinal axis of the sliding rail (i.e. translations or movements on a plane orthogonal to the longitudinal axis of the sliding rail such as to move the engraving slider away from the sliding rail).

Thanks to this solution, the connection between the engraving slider and the sliding rail is particularly stable and results in a high engraving precision.

Still, the shape constraint may be configured to allow an oscillation about the longitudinal axis of the sliding rail.

Thanks to this, it is possible to easily translate the engraving slider along the longitudinal axis even when it is not necessary to make the engraving (for example in the steps of positioning the engraving slider) without scoring the slab, for example by simply rotating the engraving slider upwards and detaching the engraving wheel from the slab during such movements preparatory to the actual engraving.

Advantageously, the axis of rotation of the engraving wheel can be fixed with respect to the engraving slider.

In this way, the configuration of the engraving cursor is made particularly simple and, in any case, effective.

In one possible embodiment, the shape constraint may be configured to define a prismatic connection between the engraving slider and the sliding rail.

Advantageously (in such a configuration), the axis of rotation of the engraving wheel may be movable with respect to the engraving slider, along a sliding direction, preferably rectilinear, orthogonal to the longitudinal axis of the sliding rail and to a rest plane defined by the slab to be cut on which the support rests.

In this way, it is possible to easily translate the engraving slider along the longitudinal axis even when it is not necessary to make the engraving (for example in the steps of positioning the engraving slider) without scoring the slab, for example by simply lifting the engraving wheel upwards and detaching the engraving wheel from the slab during such movements preparatory to the actual engraving.

According to an advantageous aspect of the invention, the connecting body can be made as a single body with the engraving slider.

Alternatively, the engraving slider may be provided with a seat configured to accommodate the connecting body therein, wherein the connecting body is (rigidly) fixed to the seat by a mechanical connection.

For example, according to an advantageous embodiment, the connecting body may comprise or consist of a rubbing bushing.

In an equally advantageous embodiment, the connecting body can be formed by at least two coaxial and axially aligned half-bushings, preferably by three half-bushings of which two end bushings and one central half-bushing, interposed between the two outer halfbushings. Still, at least one between the connecting body (or the rubbing bushing) and the sliding rail may be formed as a channel having a substantially “C” cross-section, preferably with cylindrical or prismatic inner section, wherein the channel is preferably provided with open axial ends and an opening along a full-development generatrix, so that the connecting body may coaxially embrace a sliding rail portion (or, conversely, the sliding rail may coaxially embrace the connecting body), so that the connecting body can slide axially along the sliding rail without the possibility of being radially removed therefrom by a translation along any direction orthogonal to the longitudinal axis of the sliding rail.

Advantageously, then, the connecting body can be made of a plastic material, preferably polypropylene, or polyamide 6, and/or the sliding rail can be made of metal, preferably aluminium.

Furthermore, it is possible to provide adjustment means configured to adjust and vary the sliding friction of the bushing connection defined between the connecting body and the sliding rail.

In advantageous embodiments, the support can be formed by at least one longitudinal guide bar and the sliding rail is preferably developed for the entire longitudinal development of the guide bar.

In such a case, the system may comprise a plurality of guide bars and interconnecting means configured to releasably interconnect two consecutive and coaxial guide bars to each other.

Thanks to this solution it is possible to extend the guide bar in the longitudinal direction by adapting it to various slab formats and, therefore, allowing longitudinal engravings of even greater length than the length of a single guide bar.

At the same time, once disassembled the various guide bars are easily transportable and can reduce their axial encumbrance.

According to an advantageous aspect of the invention, the system may comprise at least one suction cup connected to the support for the temporary and releasable fixing of the support to the slab.

Furthermore, the suction cup may comprise a plate from which a traction stem is derived, wherein the plate and the traction stem are made of the same material, wherein preferably the suction cup is made in a monolithic and mono-material body.

This solution allows constructively to realize the complete suction cup through a single moulding operation (of the rubber with which it is made).

Advantageously, the traction stem can be connected to traction means, preferably with cam.

Still, the support may comprise a lower surface intended to face the slab, wherein the lower surface comprises at least two rest feet, wherein the rest feet are preferably made of elastically yieldable material.

Advantageously, the rest feet can be elongated and have a longitudinal development parallel or inclined, preferably orthogonal, to the longitudinal axis of the sliding rail.

For example, the suction cup can be arranged between the two rest feet.

In an alternative (and even more simplified) embodiment, the connecting body can be configured to define a simple rest and rubbing shape constraint to allow a guided axial sliding of the engraving slider along the longitudinal axis of the sliding rail and leaving free movements of the engraving slider in at least one direction orthogonal to the longitudinal axis of the sliding rail.

A further aspect of the invention, which can also be protected independently of what has been described above, makes available a slab cutting system comprising: a longitudinal guide bar provided with a rest surface configured to rest on a slab to be cut and with a longitudinal full-development sliding rail; an engraving slider slidably associated with the longitudinal guide along a longitudinal axis thereof; and at least one suction cup connected to the guide bar for the temporary and releasable fixing of the guide bar to the slab, wherein the suction cup comprises a plate from which a traction stem is derived, characterized in that the plate and the traction stem are made of the same material.

This solution allows constructively to realize the complete suction cup through a single moulding operation (of the rubber with which it is made), thus simplifying and making the system more economical.

Advantageously, the suction cup can be made in a monolithic and mono-material body. Still, the traction stem may be connected to traction means, preferably with cam.

Advantageously, the traction stem can be inserted into a through hole of the guide bar, the traction means being arranged on the opposite side of the guide bar with respect to the plate. Still, a gripping surface of the plate may comprise at least one circular gripping lip, preferably a plurality of mutually concentric gripping lips.

Furthermore, the gripping surface of the plate may advantageously comprise a detachment relief circumscribed within the gripping lip, wherein the detachment relief, when the plate is in an undeformed configuration, protrudes axially or is flush with the gripping lip. Thanks to this, the detachment of the suction cup from the slab can be facilitated, in addition, the detachment relief contributes to reducing the empty space of the suction cup, which results in the possibility of reducing the stroke of the type stem to reach the same degree of vacuum of the suction cup.

BRIEF DESCRIPTION OF THE DRAWINGS

Further features and advantages of the invention will be more apparent after reading the following description provided by way of a non-limiting example, with the aid of the figures illustrated in the accompanying tables.

Figure 1 is an axonometric view of a system according to the invention, resting on a slab to be engraved.

Figure 2 is an enlarged view of a detail A of Figure 1 .

Figure 3 is the sectional view along the section trace Ill-Ill of Figure 2.

Figures 4A and 4B are sectional views along a sectional plane parallel to the longitudinal axis of the support of a suction cup of the system according to the invention, respectively in a release configuration and in a gripping configuration.

Figure 5A is a view of a detail of figure relating to interconnecting means of Figure 1 .

Figure 5B is a view of the detail of Figure 5B with the interconnecting means interconnected to each other.

Figure 6 is an axonometric (exploded) view of an embodiment of an engraving slider of the system according to the invention.

Figure 7 is a top plan view of Figure 6.

Figure 8 is a side elevation view of Figure 6.

Figure 9 is the sectional view along the section trace IX-IX of Figure 7.

Figure 10 is the sectional view along the section trace X-X of Figure 2.

Figure 1 1 is the view of Figure 10 with the engraving slider in a configuration raised from the slab.

Figure 12 is a sectional view of a first variant of the embodiment of an engraving slider of the system according to the invention provided with adjustment means.

Figure 13 is a sectional view of a further embodiment of an engraving slider of the system according to the invention.

Figure 14 is a sectional view of the engraving slider of Figure 13, with the engraving wheel in a configuration raised from the slab.

Figure 15 is a sectional view of a first variant of the embodiment of the engraving slider of Figure 13.

Figure 16 is a sectional view of a second variant of the embodiment of the engraving slider of Figure 13.

Figures 17 and 18 are sectional views of a further embodiment of an engraving slider of the system according to the invention.

Figure 19 is an axonometric view of a system according to the invention provided with a further embodiment of an engraving slider.

Figure 20 is an axonometric view of the engraving slider of Figure 19.

Figure 21 is a plan view of Figure 20.

Figure 22 is a side elevation view of Figure 20.

Figure 23A is a sectional view along the section trace A-A of Figure 22.

Figure 23B is a sectional view along the section trace B-B of Figure 22.

Figure 23C is a sectional view along the section trace C-C of Figure 22.

Figure 24 is a sectional view along the section trace XXIV-XXIV of Figure 19.

Figure 25 is the view of Figure 24 with the engraving slider in a configuration raised from the slab.

Figure 26 is a sectional view of an alternative embodiment of the engraving slider of Figure 10.

BEST MODE OF THE INVENTION

With particular reference to such figures, a cutting system for slabs L, preferably ceramic (or glass or similar) slabs, for example large-format slabs (for example the slab has a size substantially comprised between 3-3.5 metres x 1 -1 .5 metres) has been indicated overall with 10.

The system 10 comprises a support 20 configured to rest on a slab L to be cut.

The support 20 is elongated along a longitudinal axis A, for example rectilinear.

The support 20, in a preferred embodiment, comprises or consists of at least one longitudinal guide bar 21 .

The guide bar 21 , for example, has a length greater than a width (in turn greater than a height).

Preferably, the guide bar 21 is defined by a long and thin (for example metallic) side member (for example obtained by extrusion, i.e. having a constant section over the entire longitudinal development) defining an upper (free) surface and an opposed lower surface intended to face a surface of the slab L (resting thereon, directly or indirectly), in particular the visible surface of the slab L, i.e. that surface of the slab L which - once laid - is visible. In the embodiments shown in the figures, the guide bar 21 has a cross-sectional profile that is substantially trapezoidal, preferably isosceles.

Preferably, the guide bar 21 has a hollow profile (i.e. provided with a full-development axial cavity), for example provided with a reinforcement wall (or more), which in the example is centred on the longitudinal median plane of the guide bar 21 .

It is not excluded, however, that the longitudinal guide bar 21 may have a cross-section of any shape depending on the needs.

The guide bar 21 is substantially rigid, i.e. not deformable to the usual stresses to which it is normally subjected during the use for which it is intended.

The guide bar 21 , for example, comprises a (first) upper surface (preferably, compris- ing/formed by a smaller base and inclined sides of the trapezoidal section), and an opposite (second) lower surface (preferably, comprising/formed by a larger base of the trapezoidal section).

In practice, the lower surface is intended, in use, to be turned and facing the visible surface of the slab L.

Preferably, the lower surface comprises a central portion, preferably flat (planar), for example with full development, which defines a plane that is intended to be turned to (and be substantially parallel to) the visible surface of the slab L.

Advantageously, the lower surface comprises two edge (or side) portions, placed on the opposite side of the central portion (with respect to a flanking direction orthogonal to the longitudinal axis of the guide bar 21 ).

Preferably but not in a limiting manner, each edge portion is facing (below) the central portion.

One or each edge portion of the lower surface comprises a housing 210, preferably with longitudinal full-development with respect to the guide bar 21 , which is for example defined by a longitudinal seat, for example concave with concavity - in use - towards the visible surface of the slab L.

Preferably, the support 20 (i.e. the guide bar 21 ) rests on the slab L by means of one or more rest feet 21 1 , which are fixed for example to the lower surface of the guide bar.

Each rest feet 21 1 , for example, is yieldable, preferably elastically (e.g. made of an elastomeric material).

For example, each rest feet 21 1 is fixed (e.g., in a removable/replaceable manner) within a respective housing 210 (e.g., defining a gasket).

For example, each rest feet 21 1 extends over the entire length of the housing 210 and/or of the guide bar 21 .

For example, each rest feet 211 is substantially cylindrical (or prismatic), with a central axis parallel to the longitudinal axis A of the guide bar 21 .

At least a circumferential portion of each rest feet 21 1 protrudes transversely (towards the slab L) with respect to/below the central portion of the lower surface of the guide bar 21.

In this way, the guide bar 21 rests (in a floating and stable way) on the slab L by means of the rest feet 21 1 , which define a resilient rest plane (which adapts to the conformation of the visible surface of the slab L) for the support 20/the guide bar 21 .

The rest feet 21 1 further define an anti-friction and/or anti-slip element for the guide bar 21 on the slab L.

Furthermore, the rest feet 21 1 prevent a direct contact between the lower (rigid, for example metallic) surface of the guide bar 21 and the underlying slab L, thereby avoiding compromising the slab L (for example, the formation of scratches) due to a friction between the latter and the guide bar itself.

The rest feet(foot) 21 1 actually define(s) a rest (soft and/or resilient) plane for the guide bar 21 on the visible surface of the slab L.

In alternative embodiments not shown in the figures, one or more of the housings could be arranged transversely, for example orthogonally, to the longitudinal axis of the guide bar 21.

In this case, each rest feet accommodating in the respective housing extends (preferably parallel to the others), for example over the entire width of the guide bar 21 . In such a case, the rest feet may be more than two in number (for example equidistant between them along the length of the guide bar 21 ).

On the upper surface of the guide bar 21 there is formed at least one sliding rail 212 which preferably develops along a longitudinal (rectilinear) axis parallel to (or coincident with) the longitudinal axis A of the guide bar 21 .

The sliding rail 212 preferably extends in length along the entire length of the guide bar 21 (and has two free ends, for example coincident with the free ends of the guide bar 21 ). For example, as illustrated in the preferred embodiment shown in Figures 1 -3, 10-12, 19, 24-25, the sliding rail 212 can be defined by a cylindrical body (with circular section) joined, at an arc of generatrices (less than 90°), to the upper surface of the guide bar 21 by a fixing root (with longitudinal full-development), which for example derives from a vertex between the smaller base and an inclined side of the trapezoidal section of the guide bar 21 .

In such embodiments, the sliding rail 212 has a convex cylindrical (outer) sliding surface. It is also possible to provide that the sliding rail 212 - as shown by way of example in Figure 26 - may have a concave cylindrical (inner) sliding surface.

In such a case, the sliding rail 212 may have a greater (full development) axial opening (for example opposed the fixing root), which extends over an arc of generatrices, for example less than or equal to 180°, preferably comprised between 180° (excluded) and 90°, for example equal to 130° (as illustrated).

In other embodiments shown in Figures 13-16, the sliding rail 212 can be defined by a prismatic body (with any section, for example quadrangular/square) joined, at an edge portion, to the upper surface of the guide bar 21 by a fixing root (with longitudinal fulldevelopment), which for example derives from a vertex between the smaller base and an inclined side of the trapezoidal section of the guide bar 21 .

Also in this case, the sliding rail 21 1 may have a convex prismatic (outer) sliding surface or, alternatively, a concave prismatic (inner) sliding surface.

The sliding rail 212 (and, for example, the entire support 20 or the entire guide bar 21 ) is made of metal, preferably aluminium.

Preferably, the guide bar 21 comprises two sliding rails 212 parallel to each other (and spaced apart).

The sliding rails 212 are preferably arranged on opposite parts with respect to a longitudinal median plane of the guide bar 21 (parallel to the longitudinal axis A thereof and, for example, orthogonal to the lower surface of the guide bar 21 , i.e. of the rest surface thereof on the slab L), for example, they are symmetrical between them with respect to said median plane.

For example, the two sliding rails 212 altogether define a sliding track.

In further embodiments, shown in Figures 17-18, one between the sliding rail 212 and the sliding track can be defined by two surfaces, for example singularly planar, not belonging to the same plane, i.e. inclined to each other (such as for example orthogonal, or defin- ing/delimiting a dihedral angle other than 90°) or even parallel to each other (but not coplanar).

Furthermore, it is not excluded that the support 20 can be defined by one or more support blocks (for example two end rest blocks) which support or are joined to the opposite axial ends of one or more (for example two) sliding rails, for example each defined by a longitudinal sleeve or a longitudinal (cylindrical or prismatic) bar.

The support blocks comprise lower (direct or indirect) rest surfaces on the (visible surface of the) slab L.

In this case the rest feet can be fixed (in a removable/replaceable manner) to the lower surface of the support blocks, so that the same (and therefore the support) is supported restingly on the slab L by the (resilient) rest feet.

The longitudinal sleeve or the longitudinal bar is supported at a distance not null from the visible surface of the slab L by the support blocks (and parallel to said visible surface). The system 10 comprises at least one suction cup 30 which is connected to the support 20 for the temporary and releasable fixing of the support itself to the slab L, i.e. to the visible surface of the slab itself.

The suction cup 30 defines a temporary and releasable gripping and anchoring member, which still supports the slab L, so as to keep the support 20 fixed with respect to the slab L during the cutting/engraving operations of the slab itself implemented by the system 10. The suction cup 30 is fixed at the lower surface (for example at the central portion thereof) of the support 20, for example of the guide bar 21 (or of the support block), as will best appear hereinafter.

It is not excluded that in certain circumstances, the suction cup can be flanked to the support, that is to the guide bar, in a flanking direction orthogonal to the longitudinal axis A of the same (and parallel to the rest surface of the same on the slab L).

The suction cup 30 comprises, for example, a gripping plate 31 , for example circular.

The plate 31 is for example made of an elastically yieldable material, for example in rubber.

Preferably, the plate 31 is monolithic.

Advantageously, the plate 31 is contained laterally between the side portions of the lower surface of the guide bar 21 and above abut against at least one (annular) portion of the central portion of the guide bar 21 .

In particular, at the suction cup 30, the guide bar 21 , i.e. the central portion of the lower surface thereof, forms a (circular) outline, for example defined by a through opening, for example circular, made in the central portion of the lower surface thereof, wherein preferably the outline has an inner diameter smaller than the outer diameter of the plate 31 of the suction cup.

In this way, the edge of the outline defines an abutment surface for the plate 31 of the suction cup 30.

The plate 31 is elastically deformable, and is variously configurable between at least two configurations, of which an undeformed (when it is not subjected to any stress) or release configuration, in which it is substantially planar, and a deformed (when it is subjected to an upward pulling action from a central zone thereof) or gripping configuration, in which it is substantially concave with a concavity turned inferiorly.

The plate 31 , for example, has an upper surface, which preferably has an annular step that fits substantially to measure within the aforesaid outline.

The plate 31 has a thickness such as to protrude axially (below) beyond the plane defined by the side portions of the lower surface of the guide bar 21 .

Still, the plate 31 has a gripping surface (lower, opposed to the upper surface), which defines the rest and gripping surface of the suction cup 30 on the slab L.

The gripping surface of the plate 31 is structured.

For example, the plate 31 , i.e. the gripping surface of the plate 31 , comprises at least one circular gripping lip 310, for example peripheral (i.e. arranged near or at an outer peripheral end of the plate 31 ).

The gripping lip 310 extends circumferentially over an entire turn delimiting a closed perimeter (of the plate 31 ). The gripping lip has, in section (with respect to any radial plane, i.e. a plane to which the central axis of the suction cup belongs), a pointed shape (below), for example rectangular. Preferably but not in a limiting manner, the plate 31 , i.e. the gripping surface, comprises a plurality of (identical) mutually concentric gripping lips 310, for example with gradually decreasing diameter as they move away from the periphery of the plate.

The gripping lip 31 is configured to come into (forced) contact with the visible surface of the slab L, so as to circumferentially delimit a (variable) gripping volume of the suction cup 30.

Still, preferably but not in a limiting manner, the plate 31 , i.e. the gripping surface thereof, comprises a detachment relief 31 1 circumscribed within the gripping lip.

The detachment relief 31 1 is for example substantially discoidal (and concentric with the gripping lip 310) and radially separated from the (innermost) gripping lip 310 by a gripping gap (left empty), which defines the (variable) gripping volume of the suction cup 30.

The detachment relief 31 1 has a lower face, which when the plate 31 is in its undeformed configuration is substantially planar, while when the plate 31 is in its deformed configuration has a concave shape (with concavity turned below).

The detachment relief 31 1 , when the plate 31 is in its undeformed configuration, protrudes axially (below) or is flush with (the apex of) the gripping lip.

When the plate 31 is in its deformed configuration, the detachment relief 31 1 - by effect of the deformation - retracts (totally or at least partially) inside the axial encumbrance of the gripping lip 311 (not in contact with the slab L).

The suction cup 30 further comprises a traction stem 32, which is derived (above) from the plate 31 , for example coaxially thereto.

The traction stem 32, for example prismatic, rises substantially squared from the upper surface of the plate 31.

For example, the plate 31 and the traction stem 32 are made of the same material and, even more preferably, the plate 31 and the traction stem 32 are monolithic between them. In other words, the suction cup 30 (formed by the plate 31 and by the traction stem 32) is made in a monolithic and mono-material body.

Advantageously, the suction cup 30 (i.e. the plate 31 and/or the traction stem 32) are centred on the longitudinal median plane of the guide bar 21 , i.e. an axial median plane of the suction cup 30 coincides with the longitudinal median plane of the guide bar 21 . For example, the traction stem 32 is axially inserted into a through hole (coaxial with the aforesaid outline) of the guide bar 21 , so as to protrude above the (smaller base) of the upper surface thereof.

The protruding portion of the traction stem 32 is preferably bifurcated (forked) and has a cylindrical seat with axis orthogonal to the longitudinal axis A of the guide bar 21 and parallel to the rest plane thereof on the slab L).

Advantageously, the traction stem 32, i.e. its portion emerging above the guide bar 21 , is connected to traction means (arranged on the opposite side of the guide bar 21 with respect to the plate 31 ), preferably cam means, for example formed by a lever 33 hinged to the traction stem 32 (through a hinge pin inserted in the cylindrical seat) and provided with a cam that is eccentric with respect to the hinging axis placed at one end of the lever opposed to the free gripping end thereof.

The cam is configured to act against the upper surface of the guide bar 21 , so as to define an axial pull on the traction stem 32 (and therefore the passage from the undeformed configuration of the plate 31 to the deformed configuration thereof) following a rotation of the lever 33 and of the respective cam, respectively from a zone with a smaller thickness of the cam to a zone with a greater thickness thereof.

The cam is configured to define two stable equilibrium positions for the lever 33, of which a maximum pulling position corresponding (to the maximum thickness of the cam and) to the configuration deformed by the plate 31 and a minimum pulling position (or zero pull) corresponding (to the minimum thickness of the cam and) to the configuration undeformed by the plate 31 .

Between the two stable equilibrium positions the lever 33 travels along an arc of oscillation substantially of 180°.

In the two stable equilibrium positions, the lever 33 is substantially parallel to the guide bar 21.

Preferably, in the two stable equilibrium positions the lever 33 (and the traction stem 32) is completely included in the (vertical and lateral) encumbrance of the guide bar 21 (i.e. below each sliding rail 212).

Advantageously, the system 10 comprises a plurality of suction cups 30 (as described above), for example spaced apart along the longitudinal axis A of the guide bar 21 .

Preferably, the suction cups 30 are aligned with each other and, for example, equidistant from each other.

In the example, to the guide bar 21 there are fixed no. 3 suction cups, of which a central suction cup (arranged at the centre line of the guide bar 21 ).

The system 21 , for example, could comprise a plurality of guide bars 21 (with the respective suction cups 30), for example identical to each other (as described above).

In this case, the guide bars 21 can be interconnected with each other for defining so that each of them axially extends another guide bar 21 (i.e. so as to define a long guide bar 21 composed of the set of several guide bars 21 axially aligned and adjacent to each other).

Preferably, for this purpose (each) guide bar 21 comprises interconnecting means 40 configured to interconnect, preferably, in a releasable manner between them two consecutive and coaxial guide bars 21 .

For example, the interconnecting means 40 comprise a hooking 41 , for example a lever hooking, which is located at/near a first axial end of one (preferably each) guide bar 21 , for example at the upper surface thereof (for example the smaller base thereof).

Furthermore, the interconnecting means 40 comprise an abutment element 42 for the hooking 41 , for example a retaining tab, which is placed at/proximity of a second axial end (opposed to the first axial end) of one (preferably each) guide bar 21 , for example at the upper surface thereof (for example of the smaller base thereof).

When two guide bars 21 are aligned (coaxial) and contiguous (seamless) with each other, with the first axial end of one guide bar 21 in contact with the second axial end of another guide bar 21 , the hooking 41 is configured to hook (in a releasable manner) with the abutment element 42, holding the two guide bars 21 in the position of reciprocal axial extension.

Preferably, the interconnecting means 40 (both in the hooking position between two guide bars 21 and in the unhooking position, when not engaged) are completely included in the (vertical and lateral) encumbrance of the guide bar 21 (i.e. below each sliding rail 212). The interconnecting means 40, for example, further comprise one or more (in the example two in number) pins 43 (of reinforcement of the connection between the guide bars 21 ), configured to be fitted (simultaneously) in special axial seats made in the support bars 21 , for example at each first axial end and second axial end thereof.

Preferably, each pin 43 has a longitudinal axis parallel to the longitudinal axis A of the guide bars 21 that interconnects and has a first axial end section inserted in an axial seat of a guide bar 21 and a second axial end section inserted in an axial seat of a further guide bar 21 .

For example, when two guide bars 21 are aligned (coaxial) and contiguous (seamless), with the first axial end of one guide bar 21 in contact with the second axial end of another guide bar 21 , each pin 43 is retractable within the guide bars 21 .

In the illustrated example, the axial seats of the guide bars are defined inside each sliding rail 212 (i.e. defined by the inner axial cavity thereof).

The system 10 further comprises an engraving slider 50, which is configured to slide along a (single) sliding direction parallel to the longitudinal axis A of the guide bar 21 and make an engraving (or scoring) on the visible surface of the slab L (on which the guide bar rests), along an (rectilinear) engraving line parallel to the longitudinal axis of the guide bar 21 itself.

The engraving slider 50 comprises a main body 51 which preferably defines a handle zone 510 (or grasping zone) configured to define a (convex) rest and gripping surface for (the palm of) a (single) hand of a user.

Preferably, the rest and gripping surface defined by the handle zone 510 is curved, for example substantially hemi-cylindrical or hemispherical (not excluding

For example, the main body 51 of the engraving slider 50 is arranged substantially on the side (flanked) to the support 20 (i.e. to the guide bar 21 ), along a flanking direction orthogonal to the longitudinal axis A of the support 21 , i.e. so as to be able to overlap in plan with the visible surface of the slab L (when the support 20 is resting thereon).

The engraving slider 50 is provided with at least one engraving wheel 52 (or other suitable engraving body), which is configured to generate an engraving or scoring line on the visible surface of the slab L (on which the support rests), during the sliding of the engraving slider 50 along the sliding direction on the support 20.

The engraving wheel 52 is preferably rotatably associated with the engraving slider 50, i.e. the main body thereof 51 , about an axis of rotation orthogonal to the longitudinal axis A of the support 50 (i.e. of the guide bar 21 ).

In practice, the axis of rotation of the engraving wheel 52 (always) lies on a plane orthogonal to the longitudinal axis A (i.e. to the sliding direction of the engraving slider 50 with respect to the support 20). The engraving slider 50 is designed so that the axis of rotation of the engraving wheel 52 is substantially parallel to the visible surface of the slab L to be engraved (i.e. to the rest plane of the support 20 thereon), when it is resting (with its cutting edge) on the visible surface of the slab L.

The (idle) rotation of the engraving wheel 52 about its axis of rotation allows the rolling of (the cutting edge of) the engraving wheel itself on the visible surface of the slab L during the sliding of the engraving slider 50 along the sliding direction on the support 20 and, therefore, the realization of a longitudinal engraving (parallel to the longitudinal axis A) of an engraving line on the visible surface of the slab L.

The engraving wheel 52 (i.e. its axis of rotation) is aligned (in plan) along an alignment direction orthogonal to the axis of rotation to the handle zone 510, so that a force directed towards the slab L imparted on the handle zone 510 can result in a force (of equal magnitude) of (the cutting edge of) the engraving wheel 52 on the visible surface of the slab L.

The engraving slider 50 could comprise a single engraving wheel 52, like in the illustrated case, or a plurality of engraving wheels 52.

In the case where the engraving slider 50 comprises a plurality of engraving wheels 52, these would preferably have axes of rotation parallel to each other.

For example, it is possible to provide that the engraving slider 50 comprises two (or more) engraving wheels 52 aligned with each other (so as to lie on the same engraving line made by them).

In practice, the cutting edges of the engraving wheels 52 are aligned with each other along (and at the same height as) the engraving line (orthogonal to the axis of rotation).

In such an embodiment, the engraving wheels 52 could all have the same diameter (and having coplanar axes of rotation on a plane parallel to the engraving line tangent to the cutting edge thereof) or, preferably, have mutually different diameters (in this case having axes of rotation parallel to each other but not belonging to the same plane parallel to the engraving line tangent to the cutting edge thereof).

Still, in such an embodiment, the engraving wheels 52 could all have the same sharpening degree (or the same sharpening profile) or, preferably, have a different sharpening degree (or the same sharpening profile) between them.

In the latter case, for example, a second engraving wheel 52 placed downstream of a first engraving wheel 52 in the engraving direction along the longitudinal axis of the sliding rail 212 could have a greater sharpening degree (i.e. a more pointed sharpening profile), so as to enter in the (and retrace the) engraving line made by the first engraving wheel 52. In such a case, for example, the engraving slider 50 could have three engraving wheels 52, of which a second engraving wheel 52 interposed (along the alignment direction parallel to the longitudinal axis A of the sliding rail 212) between two first engraving wheels 52 (so that in whatever engraving direction the engraving slider is operated the second engraving wheel 52 is always downstream of a first front engraving wheel 52).

For example, the second engraving wheel 52 could have a diameter smaller than the diameter of (each) first engraving wheel 52 (which have, for example, the same diameter and/or the same sharpening degree/sharpening profile).

In a preferred embodiment shown in Figures 6-12, 17-25, the main body 51 of the engraving slider 50 (i.e. the engraving slider itself) is monolithic (and mono-material) and has the handle zone 510 (defined by an enlarged umbrella) opposed (along the alignment direction) to a support fork supporting (a rotation pin on which there is mounted) the engraving wheel 52, wherein said engraving fork branches below (the enlarged umbrella defining) the handle zone 510.

Furthermore, the main body 51 of the engraving slider 50 (i.e. the engraving slider itself) is rigid (i.e. not deformable to the usual mechanical stresses to which it is subjected during the proper use for which it is intended).

In such a case, the axis of rotation of the engraving wheel 52 is fixed with respect to the engraving slider 50 (that is, it is arranged on a fixed axis of the main body 51 of the engraving slider itself).

In a further embodiment shown in Figures 13-16, the main body 51 could be made in more (two or more) pieces, connected between them, as will be better described below.

In particular, the main body 51 could comprise a support beam provided with a rod, wherein the rod is slidably coupled to the support beam along a sliding direction, preferably rectilinear, orthogonal to the longitudinal axis A of the support 20 (and parallel to the aforesaid alignment direction).

The support beam - according to such embodiment - could be constituted by a monolithic body, as shown in Figures 13, 14 and 16, or in turn be constituted by more pieces (for example two or more pieces), as shown in Figure 15, for example rigidly connected to each other (for example by threaded members or other suitable fixing system).

In such an embodiment, the rod (for example monolithic) comprises at a first (upper) end thereof the aforesaid handle zone 510 and at the opposed second (lower) end the engraving wheel 52 (mounted at a support fork supporting a rotation pin on which the engraving wheel itself is mounted).

In such a case, a force directed along the alignment direction (and sliding of the rod with respect to the support beam) causes the rod to slide with respect to the support beam and, therefore, results in a force (of equal magnitude) of (the cutting edge of) the engraving wheel 52 on the visible surface of the slab L.

In this case, therefore, the axis of rotation of the engraving wheel 52 is movable with respect to the engraving slider 50, i.e. to the support beam thereof, along the relative sliding direction between the rod and the support beam.

For example, the rod (and therefore the engraving wheel 52 and/or the axis of rotation thereof) is movable with respect to the support beam (and therefore to the support 20) from a raised position to a lowered position (by effect of a thrust exerted by the user) in contrast to elastic return means, defined for example by a spring (which is interposed between the rod and the support beam), preferably a helical spring.

The system 10, more precisely the engraving slider 50, comprises a connecting body 55, which is configured to interconnect the engraving slider 50 to at least one sliding rail 212 of the support 20 (i.e. of the guide bar 21 ), preferably to a single sliding rail 212 of the support 20 (i.e. of the guide bar 21 ).

In practice, the connecting body 55 is configured to allow and/or guide the sliding of the engraving slider 50 with respect to the sliding rail 212 along the longitudinal axis A of the support 20 (i.e. of the guide bar 21 ).

In particular, the connecting body 55 is configured to define a rubbing connection with/on the (single) sliding rail 212.

In other words, during sliding of the engraving slider 50 along (the longitudinal axis of) the sliding rail 212 of the support 20 (i.e. of the guide bar 21 ) the connecting body 55 is configured to define a rubbing connection with the sliding rail 212 (i.e. rubs against the sliding rail).

The connecting body 55, according to a preferred embodiment shown in Figures 6-16 and 19-25 as well as Figure 26, interconnects the engraving slider 50 and a single sliding rail 212 and, preferably, defines a shape constraint with the single sliding rail itself.

In practice, the connecting body 55 (and thus the engraving slider 50) is selectively engageable with one of the sliding rails 212 (leaving the other free), depending on the engraving needs.

In particular, the shape constraint is such as to allow a reciprocal coupling between the engraving slider 50 (i.e. the connecting body 55) and the sliding rail 212 such as to allow at least one reciprocal degree of freedom, wherein said one degree of freedom (always) allowed is a degree of translational freedom (of sliding and rubbing) along the longitudinal axis of the support 20 (i.e. of the guide bar 21 and/or sliding rail 212).

The shape constraint defined by the connecting body 55 with the sliding rail 212 is preferably configured to prevent movements, preferably translations (away from/towards the sliding rail 212) of the engraving slider 50 in any direction orthogonal to the longitudinal axis of the sliding rail 212, i.e. to prevent radial removals of the engraving slider 50 with respect to the sliding rail 212.

In the embodiments shown in Figures 13-16, the shape constraint defined by the connecting body 55 with the sliding rail 212 is such as to allow a single reciprocal degree of freedom, wherein said degree of freedom is said degree of translational freedom.

In such a case, the shape constraint is defined by a prismatic coupling between the connecting body 55 and the (single) sliding rail 212.

Such an embodiment provides that the cross-section of the sliding rail 212 is substantially prismatic (male) and the cross-section (orthogonal with respect to the sliding direction and/or to the prismatic axis) of the connecting body 55 is substantially complementary (and homologous, with appropriate radial play) to the shape of the sliding rail 212.

In particular, the connecting body 55, for example, has an (any) open cross-section on at least one side, so as to be able to accommodate (with play) the fixing root of the sliding rail 212.

In practice, the connecting body 55 is shaped as a channel having a substantially “C” cross-section, preferably with a prismatic inner section, wherein the channel is preferably provided with open axial ends and a full-development opening along one side (so as to be crossed transversely by the fixing root of the sliding rail 212), so as to coaxially embrace a sliding rail portion 212 with the possibility of sliding axially along it, preferably without the possibility of being removed radially/transversely therefrom by a translation along any (radial) direction orthogonal to the longitudinal axis of the sliding rail 212.

In the preferred embodiments shown in Figures 6-12 and 19-25, as well as in Figure 26, the shape constraint defined by the connecting body 55 with the sliding rail 212 is such as to allow two reciprocal degrees of freedom, of which a first degree of freedom is said degree of translational freedom and a second degree of freedom is a degree of rotational freedom about an axis of oscillation parallel to the longitudinal axis of the support 20 (i.e. of the sliding rail 212).

Preferably, the shape constraint is configured to allow (in addition to the aforesaid translation) also a rotation, preferably an oscillation (contained within a predetermined oscillation arc) around the longitudinal (and central) axis of the sliding rail 212.

In such a case, the shape constraint is defined by a cylindrical coupling between the connecting body 55 and the (single) sliding rail 212.

This embodiment, shown in Figures 6-12 and 19-25, provides that the cross-section of the sliding rail 212 is substantially cylindrical (male) and the cross-section (orthogonal with respect to the sliding direction and/or to the prismatic axis) of the connecting body 55 is substantially complementary (and homologous, with suitable radial play) to the shape of the sliding rail 212 (or in any case is such as to be able to define a cylindrical coupling therewith).

In practice, the connecting body 55 is shaped as a channel having a substantially “C” cross-section, preferably with a cylindrical inner section, wherein the channel is preferably provided with open axial ends and a full-development opening along a generatrix (such as to be crossed transversely by the fixing root of the sliding rail 212), so as to coaxially embrace a sliding rail portion 212 with the possibility of sliding axially along it, preferably without the possibility of being removed radially/transversely therefrom by a translation along any (radial) direction orthogonal to the longitudinal axis of the sliding rail 212.

The (full-development) opening of the channel has a predetermined circumferential width, preferably greater than the circumferential width of the fixing root, so as to allow the oscillation of a predetermined oscillation arc (between two end-of-stroke positions defined by the circumferential edges of the opening itself) of the connecting body 55 with respect to the sliding rail 212.

For example, the circumferential width of the opening is less than 180°, preferably comprised between 90° and 180°.

For example, the predetermined allowed oscillation arc is less than 90°, preferably less than 45°.

In the version shown by way of example in Figure 26, the cylindrical connection between the connecting body 55 and the sliding rail 212 is inverted (complementary) with respect to that shown in Figures 6-12.

In practice, this embodiment, shown in Figure 26, provides that the cross-section of the sliding rail 212 is substantially cylindrical (female) and the cross-section (orthogonal with respect to the sliding direction and/or to the prismatic axis) of the connecting body 55 is substantially complementary (and homologous, with suitable radial play), for example of the male type, to the shape of the sliding rail 212 (or in any case is such as to be able to define a cylindrical coupling therewith).

In particular, the sliding rail 212, for example, has an (any) open cross-section on at least one side, so as to be able to accommodate (with play) a root that joins the connecting body to the main body 51 of the engraving slider 50.

The connecting body 55 in such an embodiment is shaped as a (full or hollow) cylinder, wherein the cylindrical (convex) outer surface is configured to couple with the concave cylindrical (inner) surface made available by the sliding rail 212.

In practice, the sliding rail 212 is shaped as a channel having a substantially “C” crosssection, preferably with a cylindrical inner section, wherein the channel is preferably provided with open axial ends and a full-development opening along a generatrix (such as to be crossed transversely by the root of the connecting body 55), so as to coaxially embrace a portion of the connecting body 55 with the possibility of allowing the same to slide axially along the longitudinal axis, preferably without the possibility of being removed ra- dially/transversely by the sliding rail 212 by a translation along any (radial) direction orthogonal to the longitudinal axis of the sliding rail 212.

The (full-development) opening of the channel has a predetermined circumferential width, preferably greater than the circumferential width of the root, so as to allow the oscillation of a predetermined oscillation arc (between two end-of-stroke positions defined by the circumferential edges of the opening itself) of the connecting body 55 with respect to the sliding rail 212.

For example, the circumferential width of the opening is less than 180°, preferably comprised between 90° and 180°, for example equal to 130°.

In a further variant of the embodiment described above (with cylindrical connection between sliding rail 212 and connecting body 55) and shown in Figures 19-25, the connecting body 55 (i.e. the channel defined by it) can be formed by a plurality of axial portions or half-bushings (which altogether define the aforesaid channel) coaxially aligned with each other, for example separated from each other (physically, but not necessarily in a spatial sense, i.e. which can be adjacent to each other and/or in reciprocal contact or spaced from each other according to need) in the axial direction. For example, as in the case illustrated in Figures 19-25, the connecting body 55 may be formed by at least three aligned and coaxial half-bushings, of which one central half-bushing (axially longer) and two end half-bushings (shorter than the central half-bushing) arranged on opposite sides with respect to the central half-bushing.

Advantageously, each half-bushing has, in addition to the aforesaid opening, also an auxiliary opening or circumferential slit (which develops axially along a limited axial section of the respective half-bushing).

For example, the circumferential slit of the central half-bushing is axially misaligned with respect to the circumferential slits of the end half-bushings (which, instead, are preferably axially aligned with each other).

The circumferential slits allow each half-bushing a certain degree of circumferential adaptability, that is, they allow the widening of the diameter of the half-bushing to be able to adapt to different configurations of the sliding rail 212 or to the discrepancies thereof due to the machining tolerances.

It is furthermore not excluded that the connecting body 55 can be formed by at least two opposed and mutually axially staggered half-bushings, preferably by three half-bushings of which two end bushings (aligned with each other) and axially staggered with respect to a central half-bushing, interposed between the two outer half-bushings.

Also in this case, the connecting body 55 (defined by the plurality of coaxial and axially aligned half-bushings) is shaped as a channel having a substantially “C” cross-section, preferably with a substantially cylindrical inner section, wherein the channel is preferably provided with open axial ends and the full-development opening along a generatrix (having the aforesaid circumferential width), so as to coaxially embrace a sliding rail portion 212 with the possibility of sliding axially along it without the possibility of being removed radially therefrom by a translation along any (radial) direction orthogonal to the longitudinal axis of the sliding rail 212.

In a possible embodiment (for example shown in connection with the aforesaid variant shown in Figures 19-25), the connecting body 55 is made as a single body with the engraving slider 50, i.e. with (a piece or a part of) the main body 51 thereof.

For example, the connecting body 55 is defined at an (side) appendage of the (main body 51 of the) engraving slider 50.

It is not excluded that the connecting body 55 can be defined at a part of the support beam of the engraving slider 50.

In other embodiments (e.g. shown in Figures 6-16), the engraving slider 50, i.e. its main body and/or the reinforcement beam (where provided) is provided with a seat 515, preferably placed at an (side) appendage of the (main body 51 of the engraving slider 50), which seat 515 is configured to accommodate the connecting body 55 therein.

The connecting body 55 is for example fixed (rigidly) inside the seat 515, for example so that it can be replaced as needed.

For example, the connecting body 55 is fixed to the seat 515 by a mechanical connection, for example by interference or by interlocking or by fixing members (such as threaded members or other fixing member) or by gluing or the like.

In such an embodiment, the connecting body 55 comprises or consists of a rubbing bushing 550 (or linear plain bearing), for example for dry and/or self-lubricating rubbing.

Said rubbing bushing 550 is shaped - as mentioned above - as a channel having a substantially “C” cross-section, preferably with a cylindrical or prismatic inner section, wherein the channel is preferably provided with open axial ends and a full-development opening along a generatrix or side (such as to be crossed transversely by the fixing root of the sliding rail 212), so as to coaxially embrace a sliding rail portion 212 with the possibility of sliding axially along it, preferably without the possibility of being removed radially/trans- versely therefrom by a translation along any (radial) direction orthogonal to the longitudinal axis of the sliding rail 212. The (full-development) opening of the channel defined by the rubbing bushing 550 has a predetermined circumferential width, preferably greater than the circumferential width of the fixing root, so as to allow the oscillation of a predetermined oscillation arc (between two end-of-stroke positions defined by the circumferential edges of the opening itself) of the rubbing bushing 550 (and therefore of the engraving slider 50 fixed thereto) with respect to the sliding rail 212.

The rubbing bushing 550 has an inner surface (cylindrical or prismatic), for example grooved, i.e. provided with one or more axial grooves.

The outer surface of the rubbing bushing 550 could have centring and/or fixing (interlocking) members (such as reliefs or recesses) configured to interconnect with complementary fixing members defined in the inner surface of the seat 515.

In a preferred embodiment, the connecting body 55 (either be it defined integral to the engraving slider 50 or be it defined by the rubbing bushing 550) is made of a plastic material, for example with reduced friction when in contact with a metal smooth surface, preferably of aluminium.

The system 10, i.e. the engraving slider 50, may comprise adjustment means 56 (illustrated in Figures 12 and 16) configured to adjust and vary the sliding friction of the rubbing connection defined between the connecting body 55 (either be it defined integral to the engraving slider 50 or be it defined by the rubbing bushing 550) and the sliding rail 212 to which it is coupled.

The adjustment means 56, for example, comprise a threaded member (e.g. a grub screw) screwable into a threaded hole made in the engraving slider 50, for example emerging within the seat 515.

The threaded grub screw is configured to tighten or widen the inner section of the connecting body 55, so as to increase or decrease respectively the sliding friction of the rubbing connection defined between the connecting body 55 and the sliding rail 212.

In the embodiment shown in Figures 17-18, in which the sliding rail 212 and/or the sliding track is defined by two surfaces, for example singularly planar, not belonging to the same plane, i.e. inclined to each other (such as for example orthogonal, or defining/delimiting a dihedral, convex angle, other than 90°) or even parallel to each other (but not coplanar), the connecting body 55, in turn, defines a simple constraint of simple rest (on two surfaces not belonging to the same plane) and of rubbing in order to allow a guided axial sliding (by rubbing) of the engraving slider 50 (such as on a bracket) along the longitudinal axis of the sliding rail 212.

Such a simple rest shape constraint leaves free movements of the engraving slider 50 in at least one direction orthogonal to the longitudinal axis of the sliding rail 212, i.e. the direction away from the surfaces defining the sliding rail 212, to allow the removal of the engraving slider 50 with respect to the sliding rail 212 along said direction.

In particular, the connecting body 55, in this case, is defined by two surfaces, for example homologous to the surfaces defining the sliding rail 212, therefore for example individually planar, not belonging to the same plane, or inclined to each other (such as for example orthogonal, or defining/delimiting a dihedral, concave angle, other than 90°) or even parallel to each other (but not coplanar).

The rubbing connection defined between the connecting body 55 (which may be also in this case integral to the engraving slider 50 or rigidly fixed thereto) and the sliding rail 212 is defined by the rubbing, along the longitudinal axis A of the surfaces of the connecting body 55, against the surfaces of the sliding rail 212 that act as a bracket for the engraving slider 50.

In the light of what has been described above, the operation of the system 10 is as follows. Once the engraving slider 50 has been coupled to the sliding rail 212 of the support 20, this can be rested on the visible surface of a slab L to be engraved.

When the support 20 is in the desired position, it can be fixed on the slab L by acting on the suction cups 30 (i.e. on the levers 33 thereof).

To make the engraving line on the slab it is sufficient to grip the handle zone 510 of the engraving slider 50 and by simultaneously exerting a pressure towards the slab L and a trust/traction along the longitudinal axis A it is possible to make the engraving slider 50 slide along the longitudinal axis A of the sliding rail 212, in this way the engraving wheel 52 makes an engraving line on the visible surface of the slab L.

During this sliding motion, the connecting body 55 slides on the sliding rail 212, by rubbing thereagainst, and the connection between the two keeps the engraving slider 50 guided and imposes on the engraving wheel a precise rectilinear trajectory parallel to the longitudinal axis A.

When it is necessary to change the position of the support 20 (to make a new engraving line) or remove the same, it is possible to act on the levers 33 of the suction cups, so as to release, in this way the detachment relief 31 1 detaches the gripping lip 310 from the visible surface of the slab L allowing the release of the suction cups 30 from the same.

The invention thus conceived is susceptible to many modifications and variants, all falling within the same inventive concept.

Moreover, all the details can be replaced by other technically equivalent elements. In practice, the materials used, as well as the contingent shapes and sizes, can be whatever according to the requirements without for this reason departing from the scope of protection of the following claims.

Claims

1. A slab cutting system (10) comprising:

- at least one support (20) configured to rest on a slab (L) to be cut and provided with at least one sliding rail (212) developing along a longitudinal axis (A);

- an engraving slider (50) provided with at least one engraving wheel (52) rotatable about an axis of rotation orthogonal to the longitudinal axis (A); wherein the engraving slider (50) comprises a connecting body (55) that interconnects the engraving slider (50) and the sliding rail (212) for sliding the engraving slider (50) with respect to the sliding rail (212) along the longitudinal axis (A) thereof, wherein the connecting body (55) is configured to define a rubbing connection with the sliding rail (212).

2. The system (10) according to claim 1 , wherein the connecting body interconnects the engraving slider and the single sliding rail, and wherein the connecting body defines a shape constraint with the single sliding rail configured to allow an axial sliding of the engraving slider along the longitudinal axis of the sliding rail and to prevent translations of the engraving slider in any direction orthogonal to the longitudinal axis of the sliding rail.

3. The system (10) according to claim 2, in which the shape constraint is configured to allow an oscillation around the longitudinal axis of the sliding rail.

4. The system (10) according to claim 1 or 3, wherein the axis of rotation of the engraving wheel is fixed with respect to the engraving slider.

5. The system (10) according to claim 2, wherein the shape constraint is configured to define a prismatic connection between the engraving slider and the sliding rail.

6. The system (10) according to claim 1 or 5, wherein the axis of rotation of the engraving wheel is movable with respect to the engraving slider, along a sliding direction, preferably rectilinear, orthogonal to the longitudinal axis of the sliding rail and to a rest plane defined by the slab to be cut on which the support rests.

7. The system (10) according to claim 1 , wherein the connecting body is made as a single body with the engraving slider.

8. The system (10) according to claim 1 , wherein the engraving slider is provided with a seat configured to accommodate the connecting body therein, wherein the connecting body is fixed to the seat by a mechanical connection.

9. The system (10) according to claim 1 , wherein the connecting body comprises a rubbing bushing.

10. The system (10) according to any one of the preceding claims, wherein the connecting body is formed by at least two coaxial and axially aligned half-bushings, preferably by three half-bushings of which two end half-bushings and a central half-bushing, interposed between the two outer half-bushings.

11. The system (10) according to any one of the preceding claims, wherein at least one between the connecting body and the sliding rail is shaped as a channel having a substantially “C”-shaped cross-section, preferably with cylindrical or prismatic inner section, wherein the channel is preferably provided with open axial ends and an opening along a full-development generatrix, so as to coaxially embrace, respectively, either a portion of the sliding rail or the connecting body, so that the connecting body can slide axially along the sliding rail without the possibility of being radially removed therefrom by a translation along any direction orthogonal to the longitudinal axis of the sliding rail.

12. The system (10) according to any one of the preceding claims, wherein the connecting body is made of a plastic material, and/or the sliding rail is made of metal.

13. The system (10) according to claim 1 , comprising adjustment means configured to adjust and vary the sliding friction of the rubbing connection defined between the connecting body and the sliding rail.

14. The system (10) according to claim 1 , wherein the support is formed by at least one longitudinal guide bar and the sliding rail is preferably developed for the entire longitudinal development of the guide bar.

15. The system (10) according to the preceding claim, comprising a plurality of guide bars and interconnecting means configured to releasably interconnect two consecutive and coaxial guide bars to each other.

16. The system (10) according to claim 1 , wherein at least one suction cup is connected to the support for the temporary and releasable fixing of the support to the slab.

17. The system (10) according to the preceding claim, wherein the suction cup comprises a plate from which a traction stem is derived, wherein the plate and the traction stem are made of the same material, wherein preferably the suction cup is made in a monolithic and mono-material body.

18. The system (10) according to the preceding claim, wherein the traction stem is connected to traction means, preferably with cam.

19. The system (10) according to claim 1 , wherein the support comprises a lower surface intended to face the slab, wherein the lower surface comprises at least two rest feet, wherein the rest feet are preferably made of elastically yieldable material.

20. The system (10) according to claim 19 in relation to claim 14, wherein the rest feet are elongated and have a longitudinal development parallel or inclined, preferably orthogonal, to the longitudinal axis of the sliding rail.

21. The system (10) according to claims 16, in relation to claims 14 and 19, wherein the suction cup is arranged between the two rest feet.

22. The system (10) according to claim 1 , wherein the connecting body defines a simple rest and rubbing shape constraint to allow a guided axial sliding of the engraving slider along the longitudinal axis of the sliding rail and leaving free movements of the engraving slider in at least one direction orthogonal to the longitudinal axis of the sliding rail.