Machine for correcting building boards

Abstract

A machine for correcting building panels, such as panels for walls or floors, comprises a structure for supporting and moving the panels in a supply direction (L). The machine further comprises at least one straightening tool (11) configured to operate on the sheet material and at least one movement mechanism (40) for adjusting the position of the straightening tool relative to the supply direction (L) in an adjustment direction (T) to compensate for progressive wear of the straightening tool (11) in contact with the sheet material. The machine further comprises at least one vibration sensor (64) for detecting vibrations of the at least one straightening tool (11) during use during contact with the sheet material. The data processing system is programmed to receive vibration data detected by the vibration sensor (64) during use and to compare the detected vibration data with reference vibration data indicating a predetermined operating state in which the correction tool is in contact with the sheet, corresponding to a predetermined position of the correction tool with respect to the supply direction (T). When the vibration data detected by the vibration sensor exceeds a predetermined deviation from the reference vibration data, the processing system outputs an adjustment activation instruction to activate a movement mechanism (40) for moving the correction tool in an adjustment direction (T). When the deviation between the vibration data detected by the vibration sensor and the reference vibration data is within a predetermined deviation range, the processing system also outputs an adjustment deactivation command to deactivate the movement mechanism (40), thereby interrupting the movement of the correction tool in the adjustment direction (T).

Description

Technical Field

[0001] The present invention relates to the field of machines for straightening building panels, such as wall panels or floor panels.

[0002] The invention relates in particular to panels made of ceramic or stone material, such as tiles and panels made of ceramic material, stone, marble, stoneware, porcelain and similar materials, and to machines for straightening these panels, in particular the straightening of the relative edges of these panels. Background Art

[0003] In the construction sector, walls or floors are usually built using various types of panels, which are usually made of stone or ceramic materials, ceramic materials or stone, marble, stoneware, porcelain and similar materials, which are highly valued for their wear resistance and decorative effect. The panels are generally regular polygonal, mainly square or rectangular. The production of panels from stone or ceramic materials is initially intended to create a rough product, which must then be refined before it can be marketed. In the refining operation, it is particularly important to correct the edges of the panels, so that panels with predetermined dimensions, straight edges and precise shapes can be obtained. In the case of square or rectangular panels or tiles, it is particularly important that the opposite edges are parallel and that adjacent edges are precisely at right angles.

[0004] As is known, in order to finish these products, it is necessary to use machines to straighten the opposite edges of the sheets. These straightening machines are used to remove material from the opposite sides of the sheets, so that the sheets are perfectly straight and parallel to each other. The sheets produced in this way (for example square or rectangular) have quite strict dimensional and geometric tolerances, so that by placing the sheets side by side, a regular laying area can be produced.

[0005] Generally speaking, the leveling machines used for this purpose are provided with a supporting structure with a kinematic system for the movement of the sheet in the direction of advancement. The sheet is conveyed by two rows of leveling grinding wheels, equidistant with respect to the central axis of the machine, which is parallel to the direction of advancement of the sheet. During its advancement, the sheet successively encounters various grinding wheels which progressively remove the excess material from the edge until it has brought its edge to a predetermined size. The grinding wheels are rotated by motorized groups around an axis orthogonal to the direction of advancement of the sheet. In machines of known type, such as those used for leveling tiles, there are ten or twelve grinding wheels on each side, of which the last three or four in the direction of advancement of the tile are usually used for precise leveling of the edge, while the other wheels are used for progressive leveling of the edge in preparation for the precise leveling performed by the last row of wheels.

[0006] During the processing of the plate edge, the grinding wheel gradually wears and this wear must be compensated by adjustment, which gradually brings the grinding wheel closer to the plate edge so that it can continue to remove material from the plate edge in a predetermined amount and manner until it is necessary to completely replace the grinding wheel. Conventional systems for adjusting the position of the grinding wheel are completely manual, using a screw-type system actuated by a handwheel. Such systems require a lot of experience on the part of the operator and do not ensure the proper quality of the finished product and the repeatability of the correction procedure. Another problem concerns the play that occurs in the adjustment system, for example, when a new grinding wheel is installed, and the initial zero position cannot be accurately calibrated. This disadvantage is encountered when adjusting all the grinding wheels of the machine, but it is particularly evident for the final grinding wheel used for accurate calibration of the plate edge, which needs to be adjusted more frequently to ensure high dimensional accuracy of the finished plate.

[0007] In order to at least partially overcome the disadvantages of manual adjustment, some solutions have been proposed that can automatically adjust the lateral position of the grinding wheel relative to the direction of advance of the plate. EP2542381 describes an automatic adjustment system for adjusting the position of the grinding wheel in the edge correction of tiles, which is used to project a light beam parallel to the tile supply direction. The light beam defines the predetermined working position of the grinding wheel relative to the edge of the tile to be corrected. In order to compensate for the wear of the grinding wheel, the grinding wheel is advanced laterally relative to the direction of advance of the plate in a direction towards the center of the machine until the light beam is intercepted. The movement of the grinding wheel is controlled by an electronic control unit, which is configured to receive a signal corresponding to the reception (or non-reception) of the light beam. The control unit controls the advancement of the grinding wheel until a signal of an interruption of the light beam is received, i.e., the reference position for the correct operation of the grinding wheel is reached.

[0008] The drawback of the adjustment system described in EP2542381 is that only one grinding wheel can be adjusted at a time. In fact, when the light beam common to all the grinding wheels in a row on one side of the correction machine is interrupted by the advance of one grinding wheel, thereby signaling that its own reference position has been reached, it is no longer possible to detect the interception of the light beam by another grinding wheel. It is therefore necessary to reset the light beam by slightly moving the grinding wheel that intercepted the light beam backwards, so as to be able to detect the interruption of the light beam by the other grinding wheel to be adjusted. During the operation of the correction machine, the adjustment of the grinding wheels is difficult, if not impossible, because the working environment is very dusty, which interferes with the correct operation of the light beam detection action. Summary of the invention

[0009] The main object of the present invention is to overcome the disadvantages of the prior art and to provide an automatic adjustment system which allows accurate and reliable adjustment of the position of the working tool of a machine for straightening building boards of the type mentioned in the introduction.

[0010] Another object of the present invention, which may be independent of the aforementioned object, is to provide an automatic adjustment system for the working tools of a machine for straightening building boards, which can simultaneously adjust a plurality of tools, including tools belonging to the same row of tools, which are aligned along one side of the machine to straighten the edges of the same board.

[0011] Another object of the invention, independent of the preceding one, is to provide a machine for straightening building boards, the operation of which is regular and precise, the straightening results of the boards being of considerable reproducibility, and edges of precise dimensions being obtained.

[0012] Another object of the present invention may be independent of the aforementioned object, and is to provide a dressing machine that is simple to use and can optimize the use of a dressing grinding wheel.

[0013] Another object of the present invention, independent of the aforementioned objects, is to provide a correction machine of the above type which does not require the assistance of a specialist operator to adjust the working tool.

[0014] Another object of the present invention, which may be independent of the aforementioned object, is to provide a machine for straightening boards which reduces downtime and ensures a continuous and relatively high output of straightened building boards.

[0015] The above objects and other objects of the present invention which will become more clearly apparent from the following description can be achieved by the present invention as defined in the accompanying claims.

[0016] According to a first aspect, a machine for straightening building boards, such as boards for walls or floors, is described. The machine may include a structure for supporting the board and moving the board in a supply direction. The machine includes at least one straightening tool, which is configured to operate on the board, in particular during the movement of the board in the supply direction. The straightening tool can be moved in an adjustment direction by means of a corresponding movement mechanism, which is used to adjust the position of the straightening tool, in particular relative to the supply direction, to compensate for the gradual wear of the straightening tool during continuous contact with the gradually straightened board. Next, it will be described how at least one vibration sensor is provided for detecting vibrations of the straightening tool when it is in contact with the board. The machine includes or is associated with a data processing system, such as an electronic processor, such as a computer, a portable processing device, a server, a server or computer cluster, a cloud processing service, a grid system or other well-known data processing system. The data processing system is programmed to receive vibration data detected by the vibration sensor during use of the machine, in particular at least one straightening tool, and to compare the vibration data with reference vibration data. The reference data indicates a predetermined operating state of the straightening tool in contact with the board, corresponding to a predetermined position of the straightening tool relative to the supply direction. In other words, the reference data correspond to typical vibrations detected by the vibration sensor when, for example, the straightening tool is operated under optimal conditions on the sheet material during a straightening operation in order to remove a predetermined portion of material from the edge of the sheet material.

[0017] The data processing system is programmed to output an adjustment enable command. This is a command to enable the movement mechanism of the correction tool. According to the command issued by the data processing system, the correction tool moves in the adjustment direction to approach the sheet and compensate for the wear of the tool. The adjustment enable command is issued when a first predetermined deviation of the vibration data detected by the vibration sensor relative to the reference vibration data is exceeded.

[0018] The data processing system is further programmed to output a regulation deactivation instruction. In this case, this is an instruction to deactivate the kinematic mechanism of the correction tool. According to this instruction issued by the data processing system, the movement of the correction tool in the adjustment direction will be interrupted. This regulation deactivation instruction is issued when the deviation between the vibration data detected by the vibration sensor and the reference vibration data is within a second predetermined deviation range. The first predetermined deviation (exceeding which will result in the output of the regulation activation instruction) can be equal to or preferably greater than the second predetermined deviation (which will result in the regulation deactivation) in order to determine the tolerance range of the vibration values ​​detected without intervening in the kinematic mechanism. However, this does not prevent the system from being programmed so as to continuously or almost continuously adjust the position of the correction tool to compensate for its wear.

[0019] The advantage of the machine configuration and the associated data processing system is that on a single correction tool, except during the zeroing process required for tool change, the correction tool can be regularly controlled and continuously advanced so that once restored to the initial position, the mechanical backlash will not affect the positioning accuracy of the correction tool.

[0020] The advantages are even greater when the machine comprises a plurality of straightening tools, each of which can be moved in the adjustment direction independently of the other straightening tools. In this case, each straightening tool can be equipped with a separate corresponding vibration sensor for detecting its vibrations and transmitting the corresponding vibration data to the data processing system. Thus, the various straightening tools can be controlled individually to repair the wear that occurs in individual places, thereby allowing a more precise processing of the entire row of tools usually used for straightening tools of the type described in the introduction. It is particularly advantageous that the various straightening tools can be adjusted simultaneously, thus overcoming the limitations of the prior art.

[0021] According to another aspect, it is described how a correction tool can be actuated by a corresponding electric motor and how the motor can integrate additional control of the adjustment of the calibration tool. In this case, a data processing system can be provided, because it can receive absorption data of the electric motor. Therefore, the data processing system can be configured to output the above-mentioned adjustment enable instruction if the absorption of the electric motor is less than a predetermined absorption threshold. Additionally or alternatively, the data processing system can also be configured to output the above-mentioned adjustment interrupt instruction when the electric motor used to actuate the correction tool exceeds a predetermined absorption threshold.

[0022] According to a particular aspect, the data processing system can be configured to combine the vibration data detected by the vibration sensor and the absorption data of the electric motor of the same correction tool, for example, as a result of a predetermined algorithm. The data processing system can thus compare this combined result obtained in real time from the machine with a combined result of reference vibration data and reference absorption data, for example generated by the same algorithm, indicating the above-mentioned predetermined operating state of the correction tool in contact with the sheet.

[0023] According to another aspect, it is particularly advantageous to install the vibration sensor on the moving mechanism of the correction tool, in particular but not limited to the moving motor of the mechanism in the adjustment direction, or at another position where the vibration effects generated by the interaction between the correction tool and the processed plate are particularly large and can be detected while reducing the effects of spurious vibrations, background vibrations or vibrations caused by other reasons.

[0024] According to different aspects, the motion mechanism includes a gear mechanism with a helical gear and an endless screw. In addition to the advantages brought about by the irreversible kinematics of this gear mechanism, since the thrust generated by the contact between the correction tool and the plate does not affect the positioning of the tool itself in the adjustment direction, an accuracy within one hundredth of a millimeter can be obtained during the adjustment of the correction tool, which is beneficial to both repeatability and production quality. According to a particularly advantageous aspect of strengthening the motorized control and motion group structure of the correction tool, the helical gear is formed on the outer cover of a tubular metal tube, which is coaxial with a cylindrical member, which is connected to the tubular metal tube by a thread and can move in the adjustment direction. The cylindrical member rotatably supports a shaft, which in turn supports the correction tool, and the correction tool is connected to a motor supported by the cylindrical member.

[0025] According to another aspect, a method for adjusting the position of at least one straightening tool of a machine for straightening building boards, such as boards for walls or floors, is described. The method is applicable to a machine in which the straightening tool is configured to operate on the board and can be moved in an adjustment direction to compensate for the progressive wear of the tool in contact with the board. Furthermore, the machine also comprises at least one vibration sensor associated with the at least one straightening tool. The method advantageously comprises the following steps:

[0026] - detecting, via the at least one vibration sensor, vibrations of the at least one straightening tool during use, during contact with the sheet material,

[0027] - comparing the detected vibration data with reference vibration data, the reference vibration data being indicative of a predetermined operating state of the correction tool during contact with the sheet material, corresponding to a predetermined position of the correction tool,

[0028] - when the vibration data detected by the vibration sensor exceeds a first predetermined deviation relative to the reference vibration data, outputting an adjustment enabling instruction to move the correction tool toward the plate in an adjustment direction, and

[0029] -When the deviation between the vibration data detected by the vibration sensor and the reference vibration data is within a second predetermined deviation range, an adjustment deactivation instruction is output to interrupt the movement of the correction tool along the adjustment direction.

[0030] For the reasons mentioned above, the first predetermined deviation may be the same as the second predetermined deviation, or preferably greater than the second predetermined deviation.

[0031] According to a particularly advantageous aspect, the method may further comprise the following steps: detecting the absorption amount of the electric actuator motor for the at least one correction tool, and outputting an adjustment enable command when the absorption amount of the electric motor is less than a predetermined absorption amount threshold and / or outputting an adjustment interrupt command when the absorption amount exceeds the predetermined absorption amount threshold.

[0032] According to another specific aspect, the vibration data detected by the at least one vibration sensor and the absorption data of the electric motor of the same correction tool are combined in a predetermined manner and compared with the value generated by the corresponding combination of reference vibration data and reference absorption data indicating a predetermined working state of contact between the correction tool and the plate.

[0033] Additionally, an electronic processor may be provided that is configured to perform the above method in a machine for straightening building boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features and advantages will become apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings, provided by way of non-limiting examples, in which:

[0035] - Figure 1 is a perspective view of a machine for straightening the edge of a sheet material according to aspects of the present invention;

[0036] - Figure 2 Is used to support Figure 1 A perspective view of a motorized group for correcting the grinding wheel of a machine;

[0037] - Figure 3 It is the mobile group's Figure 2 A longitudinal sectional view taken along the horizontal plane of the axis III-III;

[0038] - Figure 4 It is along the mobile group Figure 3 A cross-sectional view taken along line IV-IV of ; and

[0039] - Figure 5 It is along the mobile group Figure 3 Another cross-sectional view taken along line VV. DETAILED DESCRIPTION

[0040] In the following embodiments, the features that enable the present invention to be implemented are described. The features described can be combined with each other in various ways and are not necessarily limited to the precise embodiments involved in the drawings and related descriptions. In other words, those skilled in the art who read the following description will know how to obtain useful information items, which are helpful for understanding the method of implementing one or more described features by combining one or more described features with one or more other described features, and the specific expression of the description, paragraph, phrase or drawing does not limit the possibility of separating one or more described and illustrated features to be combined with one or more described and illustrated any other features. In more detail, considering the ability and knowledge of those skilled in the art who understand the possibility of combining features functionally without applying other different features functionally, in this description, any combination of any two features that are explicitly described must be understood as being explicitly described, even if these features are extracted from the specific context in which they can coexist or combine with other different features alone. Unless otherwise specified, each and any element, component, means, system, part, object described and illustrated in this description must be understood as being described separately and modifiable autonomously, and can be separated and / or combined with each and any other element, component, means, system, part, object described and illustrated. The materials, forms and functions described and illustrated are not intended to limit the present invention, but are merely intended to enable those skilled in the art to understand and implement the present invention according to preferred but non-limiting embodiments.

[0041] Reference now Figure 1 , shows in perspective a machine 1 for straightening panels. The machine 1 is particularly suitable for straightening the opposite edges of panels that can be used, for example, for walls or floors, such as tiles, paving blocks or panels made of ceramic material, stone, marble, stoneware, porcelain and similar materials.

[0042] The machine 1 comprises a support structure 2 on which is mounted an advancing member 3 which supports a series of sheets (not shown) so as to feed them in sequence along a longitudinal direction L from an inlet 4a to an outlet 4b of the machine 1. Figure 1 In the example, the advancing member 3 includes at least one pair of lower flexible elements 5, on which a pair of upper flexible elements 6 of belt, mesh or similar type are superimposed, the flexible elements are closed together in a ring manner, each flexible element is at least partially wrapped around two actuating wheels 7, and can be arranged to contact the opposite surface of the plate to be corrected so as to pull the plate forward along the longitudinal direction L.

[0043] Along both sides of the machine 1, parallel to the longitudinal direction L, there are arranged treatment members 9 which interact with two opposite sides of the sheet moved by the advancement member 3. The treatment members 9 comprise two opposing rows of dressing wheels 10 which are actuated so as to perform lateral dressing of the sheet conveyed in the longitudinal direction L.

[0044] Each correction grinding wheel 10 comprises a grinding wheel member 11 which rotates about a substantially horizontal axis orthogonal to the longitudinal direction L to correct the opposite edges of the plate. The grinding wheel member 11 is connected to a corresponding motorized group 12 which comprises a movement system for moving the correction grinding wheel 10 in a transverse direction T relative to the longitudinal direction L towards or away from the center of the machine 1. An automatic adjustment device, which will be described in detail below, is arranged in the machine 1 and is suitable for adjusting the transverse position of the lateral correction grinding wheel 10 relative to the longitudinal direction, which will also be described in detail below.

[0045] The processing means 9 may also comprise chamfering wheels 14 arranged at both sides of the machine 1 downstream of the rows of straightening wheels 10 and rotated by means of respective control motors 16 about an inclination axis inclined relative to the plane of the sheet.

[0046] A centering system 18 for correctly positioning the sheet to be straightened is provided at the inlet 4a of the machine 1. The centering system 18 comprises two opposite sides 20 which can be actuated to move towards or away from each other in a synchronized manner relative to the middle of the machine 1. The operation of the machine 1 is controlled by an electronic system whose operating parameters can be displayed and modified as appropriate via a control panel 22.

[0047] Figures 2 to 5 A motorized group 30 for moving a grinding wheel member 11 is shown. The motorized group 30 comprises a grinding wheel bearing shaft 32 driven in rotation by an electric motor 34. A flange 36 is fixed at the end of the grinding wheel bearing shaft 32, which is used to connect the grinding wheel member in a known manner. The motorized group 30 is mounted on the support structure 2 of the machine 1 by means of a support 38, on which a mechanism 40 for adjusting the position of the grinding wheel bearing shaft 32 in the transverse direction T is inserted, such as Figure 3 As shown, the transverse direction T is parallel to the longitudinal axis of the motorized group 30. Figure 3 and Figure 4As can be better seen in the figure, the mechanism 40 comprises a gear mechanism with a helical gear 42 and a worm 44. The worm 44 is controlled by a motor 46. The helical gear 42 is formed on the outer cover of a cylindrical metal tube 48, which is supported for rotation by a bearing 50. The cylindrical metal tube 48 in turn has a nut 52, which engages with the screw 54 and is formed on the outer wall of a cylindrical member 56. The cylindrical member 56 is mounted to slide on the support 38 so as to be able to move in the direction T with the rotation of the nut 52. The body of the motor 43 is mounted at one end 56a of the cylindrical member 56. The other end 56b of the cylindrical member 56 rotatably supports the shaft 32 close to the flange 36 by means of a bearing 58. A joint 60 of a well-known type is also received inside the cylindrical member 56, which is used to connect the shaft 62 of the electric motor 34 and the grinding wheel bearing shaft 32.

[0048] At least one vibration sensor 64 is installed on the motorized group 30. Figure 4 The vibration sensor is schematically shown in the figure only by way of example. Therefore, the position of the vibration sensor 64 is not necessarily as shown in the figure, but can also be installed at any other position on the motor group 30, at which the vibration of the motor group 30 can be detected with a specific sensitivity, which vibration is caused by the contact between the correction grinding wheel mounted at the end of the grinding wheel bearing shaft 32 in a suspended manner and the edge of the plate to be corrected. Therefore, the vibration sensor 64 can be installed on the support structure 38 of the motor group 30, or more preferably on the cylindrical member 56 that rotatably supports the grinding wheel bearing shaft 32. In some embodiments, the vibration sensor can be installed on the cylindrical member 56 near the bearing 58, which rotatably supports the grinding wheel bearing shaft near the suspended end of the grinding wheel bearing shaft 32, which carries the correction grinding wheel 11 on the flange 36 or other equivalent connection system. In other embodiments, the vibration sensor is installed on the auxiliary motor 46, which is used to actuate the mechanism for adjusting the position of the motor group 30 along the adjustment direction T.

[0049] In the simplest case, the vibration sensor 64 comprises at least one accelerometer, for example, an accelerometer having one or more axes. In other cases, the vibration sensor 64 may comprise at least one inductive sensor (with interference current) which directly detects the vibration of the grinding wheel bearing shaft 32. Other embodiments of the vibration sensor 64 may use, for example, an optical sensor. Of course, more than one vibration sensor 64 may also be installed on the motorized group 30, for example, a series of vibration sensors calibrated according to a specific frequency or frequency range.

[0050] The vibration sensors 64 are connected to an electronic control system which detects in real time the vibrations caused on the motorized groups by the contact of the correction grinding wheel with the plate to be corrected. The electronic control system acquires the vibration data transmitted by the vibration sensors 64 of each motorized group and transmits these vibration data to a processing system with application software in order to collect and analyze these data in real time during the operation of the machine 1.

[0051] The acquired data are processed to form a characteristic impression of the vibrations of the motorized group 30, for example, and to compare this characteristic impression with a reference impression previously stored in the processing system, which corresponds to the vibrations caused by the contact between the correction wheel and the edge of the sheet during the removal of a predetermined desired amount of material. In the processing system, parameters can be applied that are related to the deviations of the detected impressions from the reference impressions, and when these parameters are exceeded, the processing system can issue instructions to the electronic control system to move the position of the motorized group, in particular the correction wheel, in the T direction towards the middle of the machine 1.

[0052] More specifically, when the processing system detects that the mark obtained by the vibration sensor 64 is not within a predetermined tolerance range relative to the reference mark (for example, the vibration level decreases and / or the vibration frequency changes due to the wear of the correction wheel no longer removing the required amount of material from the edge of the plate), the processing system can issue a command to move the correction wheel toward the edge of the plate, controlling it to approach the middle of the machine 1 along the transverse direction T (or other approach directions predetermined according to the specific configuration of the machine 1 and the motorized group 30). In the example shown in the figure, the processing system sends a command to the electronic control system of the motorized group to enable the motor 46 for controlling the worm 44. Therefore, the rotation of the worm 44 drives the cylindrical metal tube 48 to rotate, and the rotation of the cylindrical metal tube in turn drives the cylindrical member 56 to move along the desired approach direction of the correction wheel toward the edge of the plate to be corrected. The movement may be of a predetermined amount, controlled in an open chain manner, or may be interrupted when the processing system detects that the vibration signature obtained by means of the vibration sensor 64 is within a second predetermined tolerance range, which is typically tighter than the tolerance range that caused the adjustment to be initiated.

[0053] The electronic control system can also be configured to detect the absorption of the electric motor 34 that controls the grinding wheel of each motorized group 30. Using these data, an absorption less than a given threshold can be detected, which may indicate that the pressure at the edge of the plate is less than it should be in the operating state where the grinding wheel is in contact with the plate material. Conversely, if the absorption of a given value is high, it may indicate that the contact degree of the grinding wheel with the plate being corrected is too high or that other operational abnormalities occur in the motorized group. These absorption data can be used to improve the control of the motorized group 30 and / or the grinding wheel 11, for example, if the absorption is less than a given threshold and the vibration sensor can detect that the grinding wheel is in contact with the plate being corrected under any circumstances, it helps to control the grinding wheel to approach the plate to be corrected. Conversely, if the absorption exceeds a predetermined value, the motorized group can be moved away from the plate being corrected to avoid damage to the plate, the motorized group or the grinding wheel itself. If the absorption remains high, the system can output an alarm, interrupt the processing operation, and send an abnormal signal so that the operator can intervene or check.

[0054] In a preferred embodiment, the vibration data detected by at least one vibration sensor and the absorption data of the motor of the motorized group can be combined according to a predetermined algorithm to obtain a summary data item, which can be compared with a corresponding summary value obtained by combining a reference vibration value and an absorption value corresponding to the optimal operating state of the motorized group and the associated correction grinding wheel.

[0055] The system for acquiring the reference signature may start with the analysis of the processing data of the reference plate, advantageously using training and artificial intelligence techniques, advantageously implemented beforehand by the manufacturer of the machine 1. The reference signature may vary depending on the type of plate being processed, the type of grinding wheel mounted on the motorized group, and the motorized group itself, and each row of motorized groups mounted on the machine 1 may be individually controlled, for example distinguishing between rough grinding wheels and fine grinding wheels.

[0056] By means of the control of the helical gear and the worm, the correction grinding wheel can be moved towards the edge of the plate with very high precision, while ensuring that the moving system of the motorized group 30 has a high rigidity, all of which is conducive to the processing accuracy of the edge of the plate.

[0057] Of course, while the principle of the invention remains unchanged, the forms of implementation and the constructional details may vary widely with respect to those described and illustrated, without thereby departing from the scope of the invention.

Claims

1. A machine for straightening building panels, such as panels and tiles for walls or floors, comprising: - a structure for supporting the sheet and moving it in the supply direction (L), - at least one straightening tool (11) configured to operate on the sheet moving along the supply direction (L), - at least one movement mechanism (40) of the at least one straightening tool in an adjustment direction (T) for adjusting the position of the straightening tool relative to the supply direction (L) in order to compensate for the progressive wear of the straightening tool (11) when in contact with the sheet material, at least one vibration sensor (64) arranged to detect vibrations of the at least one straightening tool (11) during use, during contact between the straightening tool and the sheet material, - a data processing system programmed to receive vibration data detected by a vibration sensor (64) during use of the at least one straightening tool (11) and to compare the detected vibration data with reference vibration data, the reference vibration data being indicative of a predetermined operating state of the straightening tool in contact with the sheet material, corresponding to a predetermined position of the straightening tool relative to the supply direction (T), The processing system: - when the vibration data detected by the vibration sensor exceeds a first predetermined deviation relative to the reference vibration data, outputting an adjustment enabling instruction to enable a motion mechanism (40) for moving the correction tool along an adjustment direction (T), and -When the deviation between the vibration data detected by the vibration sensor and the reference vibration data is within a second predetermined deviation range, an adjustment deactivation instruction is output to deactivate the motion mechanism (40), thereby interrupting the movement of the correction tool along the adjustment direction (T).

2. The machine for correcting building boards according to claim 1 comprises a plurality of correcting tools (11), each of which is capable of independently moving along an adjustment direction (T), and each of which is provided with at least one corresponding vibration sensor (64) for detecting the vibration of the corresponding correcting tool (11) and transmitting the corresponding vibration data to a data processing system.

3. A machine for correcting building boards according to claim 1 or claim 2, wherein the at least one correcting tool (11) is actuated by a corresponding electric motor, and a data processing system is used to receive absorption data of the electric actuating motor of the at least one correcting tool (11), and output an adjustment enable instruction when the absorption amount of the electric motor is less than a predetermined absorption amount threshold and / or output an adjustment interrupt instruction when the absorption amount exceeds the predetermined absorption amount threshold.

4. A machine for correcting building boards according to claim 3, wherein a data processing system combines the vibration data detected by the at least one vibration sensor (64) and the absorption data of the electric motor of the same correcting tool according to a predetermined algorithm, and compares the algorithm result with reference vibration data and reference absorption data indicating a predetermined working state of contact between the correcting tool (11) and the board according to a combination of the same algorithm.

5. Machine for straightening building boards according to any of the preceding claims, wherein a vibration sensor (64) is mounted on a kinematic mechanism (40) of the at least one straightening tool (11).

6. A machine for straightening building boards according to claim 4, wherein the movement mechanism (40) includes a movement motor (46) for moving the straightening tool (11) along the adjustment direction (T), and the at least one vibration sensor (64) is mounted on the movement motor (46).

7. Machine for straightening building boards according to any of the preceding claims, wherein the movement mechanism (40) comprises a gear mechanism with a helical gear (42) and a worm (44).

8. A machine for straightening building boards according to claim 7, wherein a helical gear (42) is formed on the outer cover of a tubular metal tube (48), the tubular metal tube being coaxial with a cylindrical member (56), the cylindrical member (56) being connected to the tubular metal tube (48) by a thread and being movable in an adjustment direction (T), the cylindrical member (56) rotatably supporting a shaft (32), the shaft (32) supporting a straightening tool (11), the straightening tool (11) being connected to a motor (34) supported by the cylindrical member (56).

9. A method for adjusting the position of at least one straightening tool (11) of a machine (1) for straightening building panels, such as panels and tiles for walls or floors, wherein the at least one straightening tool (11) is configured to operate on the panel and is movable along an adjustment direction (T) to compensate for progressive wear of the straightening tool (11) in contact with the panel, and wherein the machine comprises at least one vibration sensor (64) associated with the at least one straightening tool (11), the method comprising the following steps: - detecting, via the at least one vibration sensor (64), vibrations of the at least one straightening tool (11) during use and during contact with the sheet material, - comparing the detected vibration data with reference vibration data, the reference vibration data being indicative of a predetermined operating state of the correction tool during contact with the sheet material, corresponding to a predetermined position of the correction tool, - when the vibration data detected by the vibration sensor exceeds a first predetermined deviation relative to the reference vibration data, outputting an adjustment enabling instruction to move the correction tool (11) toward the plate along the adjustment direction (T), and -When the deviation between the vibration data detected by the vibration sensor and the reference vibration data is within a second predetermined deviation range, an adjustment deactivation instruction is output to interrupt the movement of the correction tool (11) along the adjustment direction (T).

10. The method according to claim 9, further comprising the steps of: The absorption amount of the electric actuator motor (34) for the at least one correction tool (11) is detected, and an adjustment enabling instruction is output when the absorption amount of the electric motor is less than a predetermined absorption amount threshold value and / or an adjustment interruption instruction is output when the absorption amount exceeds the predetermined absorption amount threshold value.

11. A method according to claim 10, wherein the vibration data detected by the at least one vibration sensor (64) and the absorption data of the electric motor (34) of the same correction tool (11) are combined in a predetermined manner and compared with the value generated by the corresponding combination of reference vibration data and reference absorption data indicating a predetermined working state of contact between the correction tool (11) and the plate.

12. An electronic processor configured to carry out the method according to any one of claims 9 to 11 in a machine for straightening building boards.

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