Multi-line machines and components

Abstract

The present application relates to a multi-wire machine and an assembly thereof. A multi-wire machine for cutting natural or artificial stone comprises: wire loops with diamond inserts of substantially the same length; a motor drum for driving the cutting motion of the wires; a single tensioning device for each wire loop; at least one wire guide roller upstream and at least one wire guide roller downstream of the stone being cut; and an assembly comprising spacer rollers in the return section of the path of the wire loops with diamond inserts, the spacer rollers being provided with grooves for inserting successive wires between the wires with diamond inserts and being mounted on the structure of the multi-wire machine; the axis of rotation of the spacer rollers being adjusted to an angle other than a right angle so as to transmit the rotational motion thereof to the individual wires with diamond inserts supported in their grooves; the spacer rollers being provided with an outer coating, the grooves being obtained in a layer of elastic plastic material provided on the cylindrical outer surface of the spacer rollers.

Description

Technical Field

[0001] The present invention relates to a multi-wire machine for cutting natural or artificial stone, that is, a machine for obtaining cuts using multiple diamond wires arranged in a known manner so as to slide over a block of stone, for simultaneously cutting the block into slabs, in whole or in part, and comprising a novel device for controlling the mutual spacing of the wires of the closed loops, which, in their return path after cutting the block, are subjected to lateral oscillations of the successive loops. Furthermore, the invention comprises specific means for positioning the wire spacing device on the multi-wire cutting machine, which simplifies assembly and maintenance operations. Background Art

[0002] The prior art includes various types of stone cutting machines with multiple diamond wires, in which closed loops of wires run in parallel inside a stone block in order to cut the block into thin slabs, so as to produce a sufficiently accurate flat surface on the slabs thus cut. Various embodiments of these machines are known, in which the wires are individually tensioned and threaded into the stone being cut, by means of precise guides upstream and downstream of the stone itself being worked.

[0003] In the production technology of natural stone slabs, it is currently possible to cut slabs with a thickness of 12 and 15 mm, which involves providing a center distance between the wires of the cutting diamond inserts of at least 20-22 mm.

[0004] In the art, diamond inserts are also manufactured with diameters reduced to just over 5 mm, allowing the removal of slabs from block stone to be limited to a thickness of approximately 10 mm. This allows for the removal of very thin slabs and, from the same volume of stone, allows for the removal of slabs with a larger surface area for final use. Consequently, the necessary center distance between adjacent diamond wires is reduced to 15 mm, and the distance between successive diamond wire inserts is reduced to 10 mm. The diamond wire loops also run continuously in the path formed by the wheels and rollers of the multi-wire machine, to which they are mounted. Furthermore, thinner slabs are more popular, and in line with the increased stone consumption, diamond inserts with diameters greater than 6-7 mm on the wire consume more energy and require more material to be crushed. In multi-wire cutting machines, the wire travel speeds are high, from 25 to 40 m / sec, that is, while they travel on the machine through the entire closed path of the loop in 1 second or less, the wires are subject to oscillations and vibrations, both vertical and horizontal, which can cause contact between adjacent wires.

[0005] In fact, the above technical limitations known in the art are related to the paths of multiple diamond wires when they are free and not engaged on supports, tensioning or return rollers or pulleys, or even immersed in the stone during cutting.

[0006] In the art, from WO2017056009A1 a multi-wire machine with a diamond-insert wire loop is known, which has a tensioning device for each wire in the loop section of the return path of the wire, so that the free path section of the wire from one side to the other of the multi-wire machine is interrupted: the free section of the wire remains about half of the complete distance of the wire in the return path.

[0007] The design of a multi-wire machine with a tensioning device for each wire on one side of the machine leaves a long extension in the upper return run of the diamond cutting wires, where the wires run parallel and at a significantly high cutting speed, traveling from one side of the machine to the other in less than 0.5 seconds. When combined with the need to reduce the spacing between adjacent diamond wires to enable cutting of plates down to 10 mm, these operating conditions themselves already require control of the wire tension. This reduction in spacing makes it possible for the wires to oscillate vertically and / or laterally, with the risk of contact and damage to the wires themselves and the stone material being cut.

[0008] Finally, to overcome this drawback and in any case produce slabs with a thickness of 10 mm from a block of stone, machines for cutting thin slabs from stone are known in the art, in which the cutting wire is guided within the block even during the wire's return path. This condition eliminates the problem of a long return path in the diamond wire's path, but, contrary to expectations, creates considerable problems with starting the machine before the wire itself begins cutting the stone. Indeed, during the cutting of the block of stone, the two cutting segments of the same diamond wire are guided in opposite directions for a short distance. However, when introduced into the block, the wires become suspended in air and travel very close to each other at a relative speed twice as fast as when immersed in the stone. This means that the relative speed of adjacent wires during cutting is 60 m / sec or more, presenting significant safety issues in terms of avoiding interference between the adjacent wires and guiding them at the start of the cut.

[0009] Thus, in the prior art, it is known to have supports and / or tensioning and rotation devices located on the return portion of the diamond wire and it is also known to use said return portion of the path of the diamond wire to cut a plate in a stone.

[0010] However, it is known that multi-wire sawing machines for cutting slabs from stone have the best efficiency if the path of the closed-loop wire has little path deviation and is in contact with pulleys or rollers (pulleys or rollers guide the position of the closed-loop wire or deviate the path), which reduces the cost and tool life of the closed-loop wire and provides diamond inserts. This condition is in contrast to cutting slabs using adjacent wires with opposite cutting directions, because the wires with diamond inserts must be guided while closed in a loop during cutting at very close heights and slightly different cutting surfaces.

[0011] Furthermore, the factors of construction and maintenance costs influence the choice of customers and users who wish to cut slabs with a minimum thickness of 10 mm from a single stone; and, since these multi-wire sawing machines are intended to perform almost continuous processing, the factor of maintenance downtime is decisive when constructing a multi-wire sawing machine capable of economically cutting uniform slabs of smaller thicknesses.

[0012] Furthermore, the current multi-wire machines for cutting stone blocks into slabs must present the new cutting edge of the insert at the entry point of the cut into the stone. This cutting edge rotation is achieved by adjusting the wire guide rollers upstream and downstream of the stone being cut. The wire rotates on its own and presents the new cutting edge in the stone. Furthermore, a more efficient way of imparting rotation to the wire with the diamond insert is needed for current multi-wire machines, which is not concentrated near the stone.

[0013] Therefore, the creation of a multi-wire stone cutting machine with low cost and allowing to cut slabs of thin thickness from stone is a technical problem that cannot be easily solved with the above-mentioned construction solutions known in the art. Therefore, what is desired and still unsolved in the art is to create a multi-wire machine that can be produced, maintained economically and also allows to maximize the life of the cutting wires with diamond inserts.

[0014] This prior art is susceptible to considerable improvement in overcoming the above-mentioned disadvantages and creating a multi-wire machine for cutting natural or artificial stone, thereby cutting thin panels economically and easily.

[0015] The technical problem to be solved by the present invention is therefore to create a cutting machine with multiple diamond wires, in which the construction of the various components, in particular the support, guidance and tensioning of the closed-loop wire, with the wire guide implemented in the return section, maintains simplicity and cost-effectiveness of maintenance during the service life of the machine, thereby reducing maintenance operations to shorten machine downtimes, but at the same time allows precise wire guidance in the return section of the extended length of the closed-loop diamond wire, so as not to divert the diamond wire in its return path, giving the wire the necessary rotation to restore the cutting edge of the insert.

[0016] A further, but not final, object of the present invention is to provide a contact between the diamond wire and the roller that maintains the correct distance between the wires themselves in the return path, limiting the contact of the wires and their deviation.

[0017] Furthermore, a non-minor part of the technical problem concerns the creation of wire spacer rollers and their durability over time, given the wear effect of the diamond inserts in the guide grooves of the spacer rollers.

[0018] Finally, another part of the above technical problem also relates to the possibility of adjusting the correct position of the rotation axis of the diamond wire spacer roller relative to the support structure of the multi-wire sawing machine. Summary of the Invention

[0019] According to the invention, this technical problem is solved by a multi-wire cutting machine for cutting natural or artificial stone, comprising: wire loops having diamond inserts of almost identical length; a motor drum for driving the cutting movement of the wires with diamond inserts; a single tensioning device for each wire loop with diamond inserts; at least one wire guide roller upstream and at least one wire guide roller downstream of the stone being cut; characterised in that it has an assembly in the return section of the path of the wire loops with diamond inserts, which assembly has, between successive wires with diamond inserts, spacer rollers provided with grooves for embedding the successive wires and mounted on the structure of the multi-wire machine; the adjustment of the axis of rotation of the spacer rollers is carried out at an angle other than right angles so as to transmit the rotational movement thereof to the single wire with diamond inserts, which wire is supported in its groove; in addition, the spacer rollers are provided with grooves obtained by machining a layer of elastic plastic material provided on the cylindrical outer surface of the spacer rollers.

[0020] Furthermore, in a preferred form, the outer covering of the spacing roller is obtained by hot casting the provided elastic plastic material and subsequent machining of the grooves.

[0021] Furthermore, in an improved embodiment: a peripheral frame is placed around the spacer roller, at least half of which is supplied with wash water and provided with water spray ports directed toward the surface of the grooves of the spacer roller.

[0022] Furthermore, in a preferred embodiment: the peripheral frame is associated with an outer lower cover to collect wash water falling from the spacing rollers.

[0023] Furthermore, in a further embodiment, the outer lower cover has a shelf end that protrudes in the direction of movement of the wire with diamond inserts, or the outer lower cover further has an ear-shaped end that protrudes from an upstream portion of the spacer roller toward the spacer roller in the direction of movement of the wire with diamond inserts.

[0024] Furthermore, in a particular embodiment: the adjustment angle of the axis of the spacer roller is adjustable by means of separate vertical and horizontal adjustment devices on at least one of the two rotating supports of the spacer roller; the connection of the horizontal or vertical adjustment device of each rotating support allows fixing the axis of rotation of the spacer roller in the desired position.

[0025] Furthermore, an improved embodiment provides that the connection between the structure of the multi-wire machine and the adjustment device is realized by means of a short beam, to which the adjustment device is applied for horizontal or vertical adjustment.

[0026] Furthermore, in a preferred embodiment variant, the vertical or horizontal adjustment device comprises an adjustment screw.

[0027] Furthermore, in a further variant, the adjustment device in the vertical direction or the adjustment device in the horizontal direction has a double adjustment screw in at least one of the different adjustment directions, which is obviously on the same rotational support as the axis of the spacer roller.

[0028] Finally, in a particular embodiment: a wire spacing roller assembly with closed-loop diamond inserts for use in a multi-wire machine for cutting stone, comprising: a rotating roller on an axis transverse to the direction of movement of the wires and the grooves for embedding the successive wires; characterised in that the rotating roller is mounted on a structure of the multi-wire machine present in the upper section of the path of the wire loops; the adjustment of the axis of rotation of the spacing roller is carried out at an angle other than a right angle so as to transmit the rotational movement thereof to a single wire with diamond inserts, which is supported in its groove; in addition, the spacing roller is provided with grooves obtained on a layer of elastic plastic material provided on the cylindrical outer surface of the spacing roller.

[0029] The characteristics and advantages of the invention are presented by way of non-limiting example with reference to the five accompanying drawings, embodied as a multi-wire cutting machine for cutting natural or artificial stone blocks, provided with a spacing device for the wires used to cut the stone blocks into slabs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is an overall perspective schematic view of a spacer roller of a diamond wire according to the invention, the diamond wire running in parallel in a return extension of the path of a diamond wire loop present in a multi-wire machine;

[0031] Figure 2 is a schematic top view of a spacer roller and a structure for connecting and supporting the roller to a multi-line machine;

[0032] Figure 3 is a schematic side view of a stone cutting machine having a plurality of diamond wire loops with inserts; in this figure, the rotating components that support, tension, and guide the diamond wire loops are visible; the stone being processed is not shown; also visible in the figure are the spacer rollers located on the return section of the wire loops with diamond inserts;

[0033] Figure 4 Is similar to the above Figure 3a schematic side view showing only the path of the wire loop with diamond inserts and the position of the spacer rollers in the return section of the loop as indicated by the direction of its cutting motion;

[0034] Figure 5 It is a side view schematic diagram of the installation, adjustment and rotation support of the structure of the spacer roller and the multi-line machine;

[0035] Figure 6 is a schematic top view of spacer rollers mounted on a multi-wire machine and a wire with diamond inserts being guided over the spacer rollers;

[0036] Figure 7 is a perspective view of the spacing rollers of successive wire loops as seen from below their mounting position on the machine support structure; the guided wire is visible above the spacing rollers in a multi-wire sawing machine;

[0037] Figure 8 is a perspective view of the spacing rollers of successive wire loops as seen from above in the mounted position where the wires are visible and present in a multi-wire sawing machine. Specific embodiments

[0038] In the figure, a spacer roller is visible and rotates about an axis A placed transversely to the path of the wire 2 with diamond inserts; the spacer roller has a rotary support 3 housed on a short beam 4, parallel to the direction of movement D of the wire 2; the contact between the wire and the spacer roller 1 occurs in a groove 5 obtained by machining a layer of elastic plastic material 6 provided on the cylindrical outer surface of the spacer roller 1. The short beam 4 is connected to the rotating support 3 by means of adjustment screws 7, which are oriented parallel to the direction D of the wires with diamond inserts, that is, in the horizontal direction. These screws form the horizontal adjustment means for the spacer rollers. The support itself also has locking screws 8 between the support and the short beam 4, which, when loosened, allow sliding in the direction of extension of the horizontal adjustment screws. The short beam 4 is also connected near its ends 9 to adjustment screws 10, each of which is oriented perpendicular to the aforementioned adjustment screws, that is, in the vertical direction. These screws form the vertical adjustment means for the spacer rollers. These latter vertical adjustment screws 10 connect each of the opposite ends 9 of the short beam 4 and securely fix them to a bracket 11, which is fixed to the structure 12 of the multi-wire sawing machine by means of conventional fixing screws 13. Thus, the assembly 14 forming the upper spacer rollers is mounted midway along the return extension 15 of the cutting wire 2 in the multi-wire machine.

[0039] The spacer roller 1 also has an external fixed hood 16 that covers the roller itself from below and is fixed to the rotating support 3 by means of a peripheral frame 17. This peripheral frame is advantageously hollow on one side and is supplied with wash water, typically in multi-line machines, via a water connection 18. The water in the peripheral frame feeds a jet (not shown) facing the surface of the roller's groove 5, which wets the roller itself and, through a drag effect, the diamond wire 2 in contact with the roller. Excess water falls into the interior of the hood 16 and then onto the stone being processed, while the water ejected by centrifugal force is precisely collected by the roller's ears 20, located upstream of the roller in direction D, and by shelves 19, located downstream of the roller in direction D. The shelves 19 and ears 20 limit the splashing of the centrifugal water jet caused by the movement of the wire 2 and the spacer roller 1.

[0040] Figure 3 and Figure 4 Other components of the multi-wire machine are shown which interact with the upper spacing roller assembly 14, namely: wire guide rollers 21, which are located upstream and downstream of the stone to be cut, not shown here; a motor drum 22, which imparts a cutting movement D to the multiple wires 2 with diamond inserts; a single tensioning device 23, which is used for each wire loop with diamond inserts and from which, as can be seen, the upper spacing roller assembly 14 is located halfway between the motor drum 22 and the tensioning device 23, and as can be seen from the two figures, this position is deviated from the path of the wire 2 with diamond inserts by a few tenths of a degree, that is, it does not significantly affect the winding of the wire, which, as is well known, often affects the service life of the wire with diamond inserts.

[0041] Figure 6 The angle B at which the axis A of the spacer roller 1 is adjusted relative to the direction of movement D of the wire 2 with diamond inserts is shown. This angle is slightly greater than a right angle to allow contact between the wire 2 and the grooves 5 of the spacer roller and, in addition to dragging the roller so that it rotates freely, also allows a rotation effect on the axis of the single wire 2 with diamond inserts, which promotes and transmits the rotation of the wire, so that a different part of the cutting edge of the diamond insert is gradually revealed below the cutting portion at the entrance to the stone cutting than in the subsequent cutting steps, thus refreshing the cut.

[0042] Finally, the structure 12 of the multi-wire machine is provided with a plurality of threaded seats 24 to house the fixing screws 13 and allow stepped positioning relative to the user's cutting needs, which may vary depending on the material of the natural stone being cut.

[0043] According to the present invention, the assembly 14 with spacer rollers 1 operates as follows. A diamond-tipped wire 2 wound into a loop is mounted on the rotating part of a multi-wire machine. It is equipped with a motor drum 22, a tensioning device 23, and wire guide rollers 21, with the distance between the grooves 5 being equal to the distance between the wires 2 during stone cutting. The spacer rollers ensure that the grooves 5 are spaced uniformly so that the path of the diamond-tipped wire loop aligns with the closed path of the loop in the multi-wire machine. The upper spacer roller assembly 14 can be installed on existing multi-wire cutting machines to rotate the diamond-tipped wire 2 in the wire return section 15. Because the return section is much longer than the cutting section in the lower path and has lower wire tension, the rotation effect, which is imparted to the diamond-tipped wire by the wire guide rollers 21 during use, is more effective. In practice, it has been found that the most favorable conditions for adjusting the axis A of the spacer roller 1 are achieved by adjusting the angle B to 90° (plus or minus 1°).

[0044] The grooves 5 of the spacer roller 1 are obtained by surface machining from an elastic plastic material provided on the cylindrical outer surface of the spacer roller 1, which is most advantageously achieved by hot casting in a special shape. This machining, although expensive, allows obtaining a certain dimensional accuracy of the grooves 5 and better wear resistance in contact with the diamond inserts of the wire.

[0045] The spacer roller 1 is mounted on the multi-wire machine's structure 12, with the bracket 11 positioned in threaded seats 24 on the structure using fixing screws 13. As can be seen, a series of multiple threaded seats 24 allow the assembly 14 with the spacer roller 1 to be positioned midway along the return extension 15 of the wire loop's path, which best suits the user's needs for the material being cut. The spacer roller 1 is then adjusted so that its axis of rotation A has an adjustment angle B that is slightly less than a right angle. This operation is enabled by manipulating the vertical adjustment screws 10 and the horizontal adjustment screws 7, thereby positioning each of the two rotating supports 3 of the spacer roller 1 on the structure 12 so that the groove 5 of the spacer roller is aligned with the wire 2 with the diamond insert, which extends through the multi-wire machine at the specified angle B. At the end of the adjustment of the axis A of the spacer roller 1, the horizontal adjustment screws 7, the vertical adjustment screws 10, and the locking screw 8 are tightened to secure the spacer roller in place.

[0046] Furthermore, the upper spacing roller assembly 14 can be mounted in a fixed position, that is, without providing for vertical or horizontal adjustment of the rotating support of the spacing roller 1. This fixed position has precise adjustment angles of the axis A, both higher and lower than a right angle, before the machine is manufactured, thereby preventing inexperienced users from erratically adjusting the adjustment angles.

[0047] Furthermore, during rotation, the spacer roller 1 is wetted by the washing water on the trough 5 and by the dragging action of the same wire 2 with diamond inserts, in order to keep the trough clean. Thus, the water centrifuged by the rotation of the trough 5 and the travel of the wire 2 is collected by the outer cover 16, the shelf 19 and the ear piece 20.

[0048] The advantages of the multi-wire stone cutting machine with wire spacing control device described above can be summarized as follows: the spacing rollers have minimal influence on the normal use of the cutting wire with diamond inserts. That is, the wire 2 is not damaged by further winding of pulleys or rollers as has been done in the prior art.

[0049] Furthermore, due to the particular inclination B of the axis A of the spacer rollers, the small contact between the grooves 5 of the spacer rollers 5 and the corresponding wire 2 with diamond inserts gives the wire 2 a rotation thereon, thereby causing the wire to have an additional cutting edge in the diamond insert at each subsequent cut.

[0050] Furthermore, the long belt return extension 15 of the wire 2 with diamond inserts is divided into two parts of much shorter length so as to bring about the braking of possible vibrations and oscillations (in the vertical direction and more particularly in the horizontal direction) avoiding that the parallel running wires 2 could accidentally come into contact and damage the machine and the stone being processed.

[0051] Obviously, in the creation of a multi-wire machine and a wire distance control device for cutting stone, as described above, a person skilled in the art may apply the features described in such variants as may be considered appropriate, but all of which are included in the appended claims.

[0052] In fact, the vertical adjustment means, that is, the screw(s) 10 or the horizontal screw(s) 7, can be present at a single end 9 of the short beam 4. Furthermore, the vertical or horizontal adjustment means can also be used to connect and secure each rotating support of the axis A of the spacer roller 1 directly to the structure 12 of the multi-line machine, without the need for a short beam 4. Furthermore, the means for adjusting the axis A can be present only on one of the two rotating supports 3 of the spacer roller 1. Thus, although less advantageous, the adjustment means can also be made of a groove or a series of holes with a fixed spacing, as well as locking screws for securing the rotating support 3 of the axis A of the spacer roller. Furthermore, although still less advantageous, the covering of the cylindrical surface of the spacer roller can also be made of an elastic plastic material provided by a strip fixed to the cylindrical surface, or by a ring of elastic plastic material with pre-formed grooves 5 formed therein. Finally, the cover 16, the shelf 19, and the ear 20 can be absent.

Claims

1. A multi-wire machine for cutting natural or artificial stone, comprising: a wire loop with diamond inserts of substantially the same length; a motor drum (22) for driving the cutting motion of the wire (2) with diamond inserts; A single tensioning device (23) for each of the wire loops with diamond inserts; at least one wire guide roller (21) upstream of the stone being cut and at least one wire guide roller (21) downstream; characterized in that, in the return section (15) of the path of the wire loops with diamond inserts, there is an assembly (14) with spacing rollers (1) between the wires with successive diamond inserts, the spacing rollers (1) being provided with grooves (5) for embedding the successive wires (2) and being mounted on the structure (12) of the multi-wire machine; the axis of rotation (A) of the spacing rollers (1) being adjusted to an angle (B) other than a right angle so as to transmit the rotational movement thereof to each of the wires (2) with diamond inserts, the wires (2) being supported in their grooves (5); in addition, the spacing rollers (1) are provided with an outer coating, the grooves (5) being obtained on a layer of elastic plastic material (6) provided on the cylindrical outer surface of the spacing rollers (1).

2. The multi-wire machine according to claim 1, characterized in that The outer covering of the spacing roller (1) is obtained by hot casting the elastic plastic material (6) provided and subsequent machining of the grooves (5).

3. The multi-wire machine according to claim 1, characterized in that Around the spacer roller (1) a peripheral frame (17) is placed, at least half of which is supplied with wash water and provided with jets directed towards the surface of the grooves (5) of the spacer roller (1).

4. The multi-wire machine according to claim 3, characterized in that The peripheral frame (17) is associated with an outer lower cover (16) to collect the wash water falling from the spacing roller (1).

5. The multi-wire machine according to claim 4, characterized in that The outer lower cover (16) has a shelf end (19) that protrudes in the direction (D) of movement of the wire (2) with diamond inserts.

6. The multi-wire machine according to claim 4, characterized in that The outer lower cover (16) has an ear-shaped end (20) which projects from a component downstream thereof in the direction of movement (D) of the wire (2) with diamond inserts towards the spacer roller (1).

7. The multi-wire machine according to claim 1, characterized in that The angle (B) of the rotation axis (A) of the spacing roller (1) can be adjusted by means of separate vertical and horizontal adjustment devices on at least one of the two rotation supports (3) of the spacing roller (1); the connection part of the horizontal or vertical adjustment device of each rotation support allows the rotation axis (A) of the spacing roller (1) to be fixed in the desired position.

8. Multi-wire machine according to the preceding claim 7, characterized in that The connection between the structure (12) of the multi-line machine and the adjustment device is realized by means of a short beam (4), on which the adjustment device (7, 10) is applied to carry out horizontal or vertical adjustment.

9. The multi-wire machine according to claim 7, characterized in that The vertical direction adjustment device (7) comprises an adjustment screw.

10. The multi-wire machine according to claim 7, characterized in that The horizontal direction adjustment device (10) comprises an adjustment screw.

11. The multi-wire machine according to claim 9, characterized in that The vertical adjustment device has a double adjustment screw (7, 10) which is located in at least one of the different adjustment directions, on the same rotary support (3) of the rotation axis (A) of the spacing roller (1).

12. The multi-wire machine according to claim 10, characterized in that The horizontal adjustment device has a double adjustment screw (7, 10) which is located in at least one of the different adjustment directions, on the same rotary support (3) of the rotation axis (A) of the spacing roller (1).

13. A multi-wire machine according to any preceding claim, characterised in that The angle (B) of the rotation axis (A) of the spacing roller (1) is adjusted to a value of 90°+ / -1°.

14. An assembly (14) for a multi-wire machine having a spacer roller (1) for a wire (2) closed in a loop, the wire having diamond inserts, the assembly comprising: Roller, said roller rotating about an axis of rotation (A), said axis of rotation (A) being transverse to the direction of movement of said wire (2) and of the groove (5), said groove (5) being used to embed said successive wires; characterised in that said assembly (14) with rotating rollers is mounted in the return section (15) of the path of said wire loops with diamond inserts, on the structure (12) of said multi-wire machine; said rotating rollers are spacers (1) between said successive wires (2) with diamond inserts; the adjustment of the axis of rotation (A) of said spacing roller (1) is carried out at an angle (B) other than a right angle so as to transmit the rotational movement thereof to a single said wire (2) with diamond inserts, said wire being supported in its groove (5); furthermore, said spacing roller (1) is provided with said groove, said groove being obtained on a layer of elastic plastic material (6) provided on the cylindrical outer surface of said spacing roller (1).

15. Assembly (14) according to claim 14, characterized in that The angle (B) of the rotation axis (A) is adjusted to a value of 90°+ / -1°.

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