APPARATUS FOR REMOVING AN ABRASIVE ELEMENT IN A MACHINE FOR WORKING SURFACES AND RELATED REMOVAL METHOD

Abstract

An apparatus for removing an abrasive element having a perimeter edge delimiting an abrasive surface in a machine for finishing surfaces comprising a support body for removably engaging the abrasive element. The support body and the abrasive element are, respectively, provided, at respective engagement surfaces of first and second engagement members configured to move, from an engagement configuration to a disengagement configuration, and vice versa. A displacement device is, furthermore, provided to move the support body in the space according to at least 1 degree of freedom. A removal group is, furthermore, provided comprising at least a removal member adapted to rotate about a rotation axis and provided with a removal surface. This is adapted to engage the second engagement members to cause the first and second engagement members to move from the engagement configuration to the disengagement configuration.

Claims

1. A machine for finishing surfaces comprising: a support body configured to removably engage an abrasive element having a perimeter edge delimiting an abrasive surface, said support body and said abrasive element being, respectively, provided, at respective engagement surfaces of first and second engagement members configured to move, from an engagement configuration to a disengagement configuration, and vice versa; a displacement device configured to move said support body in the space according to at least 1 degree of freedom; an apparatus for removing said abrasive element from said support body; said machine being characterized in that said apparatus comprises a removal group provided with at least a removal member configured to rotate about a rotation axis in a predetermined direction of rotation, said or each removal member being provided with a removal surface configured to cause said first and second engagement members to move from said engagement configuration to said disengagement configuration; in that said displacement device is configured to position said abrasive surface of said abrasive element in contact with said removal surface at a predetermined removal zone with a predetermined starting inclination (i) with respect to said rotation axis, and in that said predetermined starting inclination (i) is such that said removal member is adapted to cause said first and second engagement members to move from the engagement configuration to the disengagement configuration starting from a perimeter portion adjacent to said perimeter edge.

2. Machine according to claim 1, wherein a barrier member is, furthermore, positioned downstream of said removal zone with respect to said direction of rotation of said or each removal member, said barrier member being configured to be positioned between said abrasive element and said or each removal member during the removal of said abrasive element from said support body.

3. Machine according to claim 1, wherein said removal surface is configured to engage said second engagement members of said engagement surface of said abrasive element.

4. Machine according to claim 1, wherein said removal group comprises: a first removal member adapted to rotate about said rotation axis; at least a second removal member adapted to rotate about said rotation axis and positioned at a predetermined distance from said first removal member.

5. Machine according to claim 4, wherein said first and said at least a second removal member belong to the same cylindrical body and are separated by a groove having a width equal to said predetermined distance and coaxial to said rotation axis.

6. Machine according to claim 1, wherein said displacement device, during said removal action of said removal group, is configured to move said support body along an advancing direction from said predetermined starting inclination (i) to a predetermined final inclination (f) less than said predetermined starting inclination (i) and substantially parallel to said rotation axis, said direction of rotation of said or each removal member being opposite to said advancing direction of said support body.

7. Machine according to claim 1, wherein said predetermined starting inclination (i) is comprised between 15 and 75.

8. Machine according to claim 1, wherein said removal group comprises, furthermore, a stretching member configured to stretch said abrasive element, during the removal of said abrasive element by the or each removal member in such a way to avoid that said abrasive element can form folds or wrinkles during the action of the or each removal member.

9. Machine according to claim 8, wherein said stretching member is configured to rotate about a rotation axis in a predetermined direction of rotation opposite to said direction of rotation, said rotation axis being parallel to said rotation axis of said or each removal member.

10. Machine according to claim 1, wherein a reference surface is, furthermore, provided having a known spatial position, said displacement device, before positioning said abrasive element at said or each removal member being configured to position said abrasive surface of said abrasive element adjacent to said reference surface and assuming said known spatial position of said reference surface as the spatial position of said abrasive surface.

11. Machine according to claim 10, wherein said reference surface is positioned at least at a support member of a rotation shaft on which said or each removal member is mounted.

12. Machine according to claim 1, wherein said removal surface of said removal member is substantially flat.

13. Machine according to claim 1, wherein said removal member is a disc configured to rotate about said rotation axis.

14. Machine according to claim 13 wherein said rotation axis is adapted to pass through the centre of said disc.

15. Machine according to claim 1, wherein said removal member is provided with at least a groove coaxially arranged to said rotation axis.

16. Machine according to claim 1, wherein said removal member is provided with a plurality of grooves coaxial to said rotation axis.

17. Machine according to claim 1, wherein a collecting container is, furthermore, provided having an inlet mouth positioned below the removal group through which said abrasive members fall once removed from said support body.

18. Machine according to claim 17, wherein said inlet mouth of said collecting container is positioned at a top wall of said container body.

19. Machine according to claim 17, wherein said inlet mouth of said collecting container is positioned at a lateral wall of said container body.

20. Machine according to claim 17, wherein said collecting container is provided with at least a guide wall configured to guide said removed abrasive element towards said inlet mouth.

21. Machine according to claim 2, wherein said barrier member comprises at least a protruding portion adapted to be positioned between said first and said at least a second removal member.

22. Machine according to claim 2, wherein said barrier member comprises a main portion from which a plurality of protruding portions is adapted to protrude, each of which configured to be positioned, in use, between said first and said at least a second removal member.

23. Machine according to claim 22, wherein said main portion of said barrier member is inclined at a predetermined angle with respect to said rotation axis.

24. A method for removing an abrasive element having a perimeter edge delimiting an abrasive surface in a machine for finishing surfaces, said method comprising the steps of: providing a support body configured to removably engage said abrasive element, said support body and said abrasive element being, respectively, provided, at respective engagement surfaces of the first and second engagement members configured to move from an engagement configuration to a disengagement configuration, and vice versa; moving said support body in the space according to at least 1 degree of freedom by a displacement device; said method being characterized in that a removal step is, furthermore, provided for removing said abrasive element from said support body, said removal step comprising the steps of: rotating at least a removal member about a rotation axis in a predetermined direction of rotation, said or each removal member being provided with a removal surface configured to engage said second engagement members of said engagement surface of said abrasive element at a removal zone to cause said first and second engagement members to move from said engagement configuration to said disengagement configuration; positioning by said displacement device said abrasive surface of said abrasive element in contact with said or each removal member at a predetermined removal zone with a predetermined starting inclination (i) with respect to said rotation axis, said predetermined starting inclination (i) being such that said removal member is adapted to cause the first and second engagement members to move from the engagement configuration to the disengagement configuration starting from said perimeter edge.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The invention will be now illustrated with the following description of an exemplary embodiment thereof, exemplifying but not limitative, with reference to the attached drawings wherein:

[0055] FIG. 1 diagrammatically shows a side elevation perspective view of a possible embodiment of an apparatus, according to the invention, for removing an abrasive element in a machine for finishing surfaces;

[0056] FIG. 2 diagrammatically shows a side elevation exploded perspective view of a possible embodiment of a working head of which the machine for finishing surfaces can be equipped to highlight some technical characteristics;

[0057] FIGS. 3 to 6 diagrammatically show a side elevation perspective view of a possible sequence of steps carried out by a first embodiment of the apparatus, according to the invention, for removing an abrasive element from a support body;

[0058] FIGS. 7 to 13, 15 and 16 diagrammatically show side elevation perspective views of some alternative embodiments provided by the invention for the apparatus according to the invention for removing an abrasive element from a support body;

[0059] FIG. 14 diagrammatically shows an enlargement of FIG. 13 to highlight some technical characteristics;

[0060] FIGS. 17 to 20 diagrammatically show side elevation perspective views of further alternative embodiments of the apparatus according to the invention for removing an abrasive element from a support body in a machine for finishing surfaces;

[0061] FIG. 21 diagrammatically shows a side elevation perspective view of a further alternative embodiment of the apparatus, according to the invention, for removing an abrasive element from a support body in machines for finishing surfaces;

[0062] FIG. 22 shows an enlargement of a portion of the apparatus of FIG. 21 to highlight some technical characteristics;

[0063] FIG. 23 diagrammatically shows a side elevation view of another alternative still embodiment of the apparatus, according to the invention, for removing an abrasive element from a support body in machines for finishing surfaces;

[0064] FIG. 24 diagrammatically shows a side elevation perspective view the apparatus of FIG. 23;

[0065] FIG. 25 shows an enlargement of a portion of the apparatus of FIG. 24 to highlight some technical characteristics;

[0066] FIG. 26 diagrammatically shows a side elevation view partly sectioned of the apparatus of FIG. 23.

DETAILED DESCRIPTION OF SOME EXEMPLARY EMBODIMENTS OF THE INVENTION

[0067] In FIG. 1, an apparatus 100 is diagrammatically shown, according to the invention, for removing an abrasive element 20 provided with a perimeter edge 26 delimiting an abrasive surface 22, in particular adapted to carry out a polishing action at the surface to be worked, in a machine 1 for finishing surfaces. The machine 1 comprises, in particular, a support body or backing pad 10, for example integral to a working head 50, configured to removably engage the abrasive element 20. More precisely, the support body 10 and the abrasive element 20 are, respectively, provided, at respective engagement surfaces 13 and 23, of first and second engagement members 15 and 25 configured to move from an engagement configuration to a disengagement configuration, and vice versa. In particular, the engagement surface 23 of the abrasive element 20 is arranged at the opposite side of the aforementioned abrasive surface 22.

[0068] In an embodiment provided by the present invention, the aforementioned first and second engagement members 13 and 23 can be, respectively, first and second portions of predetermined size of a hook-and-loop fastener adapted to removably engage to each other, also called, respectively, male Velcro and female Velcro. Alternatively, the aforementioned first and second engagement members 13 and 23 can be adapted to provide a snap-fit engagement. In this case, the first engagement members 13 can comprise at least a protrusion 13 and the second engagement members at least a recess 23, or vice versa.

[0069] The machine 1 comprises, furthermore, a displacement device 40 configured to move the support body 10 in the space according to at least 1 degree of freedom.

[0070] In particular, the displacement device 40 can be configured to move the support body 10 according to one or more rotational degree of freedom, or according to a combination of movements comprising at least a translational degree of freedom and at least one rotational degree of freedom and, altogether, according to a number of degrees of freedom between 2 and 6. In an embodiment provided by the invention, the displacement device 40 can be an anthropomorphic robot.

[0071] In particular, the displacement device 40 can be configured to cause at least a rotation motion of the support body 10 about a rotation axis 101 with respect to the working head 50. The machine for finishing 1 can be also a roto-orbital machine and, therefore, the displacement device 40 can be configured to move the support body 10, in such a way that this follows an eccentric orbit with respect to the axis of the working head 50.

[0072] According to what is provided by the present invention, the apparatus 100 comprises, furthermore, a removal group 70 provided with at least a removal member 75 configured to rotate about a rotation axis 175 in a predetermined direction of rotation. In particular, the or each removal member 75 can be provided with a removal surface 76 configured to cause the first and second engagement members to move from the engagement configuration to the disengagement configuration, advantageously starting from a perimeter portion 27 adjacent to the aforementioned perimeter edge 26. The displacement device 40 is, advantageously, configured to position the abrasive surface 22 of the abrasive element 20 in contact with the aforementioned removal surface 76 at a removal zone 71 with a predetermined starting inclination xi with respect to the rotation axis 175 (diagrammatically shown in FIG. 3). More in particular, the predetermined starting inclination xi can be such that the removal member 75 is adapted to cause the first and second engagement members 15 and 25 to move from the engagement configuration to the disengagement configuration starting from the perimeter portion 26.

[0073] Advantageously, the removal group 70 can provide a rotation shaft 77 on which each removal member 75 is mounted. The rotation shaft 77 can be adapted to rotate about the aforementioned rotation axis 175 operated by a motor 95, for example an electric motor. In particular, the motor 95 can be operatively connected to the rotation shaft 77 by a motion transmission group 96 diagrammatically shown with a block in the figures. The motion transmission group 96 can comprise, for example, a determined group of gears, not shown in the figure for simplicity, for example a pinion mounted on the axis of the motor 95 adapted to mesh with a toothed wheel coaxially arranged to the rotation shaft 77, or a first pulley coaxial to the axis of motor 95 and a second pulley coaxial to the rotation shaft 77, also these not shown in the figures for simplicity, connected by a motion transmission member, for example a belt, or a transmission chain, or analogous known motion transmission gears able to cause the rotation by a motor of a rotation shaft about its rotation axis.

[0074] In particular, the aforementioned rotation shaft 77 can be operatively connected to a support structure, for example a wall 121 of a collecting container 120 where the abrasive members 20 are collected once removed from the support body 10. More in particular, the collecting container 120 can have an inlet mouth 125 positioned below the removal group 70 through which the abrasive members 20 fall by gravity once removed from the support body 10.

[0075] Advantageously, the displacement device 40, during the removal step, is adapted to move the support body 10 along a advancing direction 110, in particular substantially orthogonal to the generatrices of the or each removal member 75. In particular, the aforementioned predetermined direction of rotation 176 of the or each removal member 75, can be such to be opposed to the advancing direction 110 of the support body 10 with respect to the removal member 75 (see FIGS. 4 and 5). More in particular, the aforementioned predetermined direction of rotation 176 of the or each removal member 75 can go from the support body 10 to the abrasive element 20. More precisely, if the support body 10 move the abrasive element 20 adjacent to the removal surface 76 from the left, the aforementioned direction of rotation 176 is, advantageously, counter-clockwise. Instead, if the support body 10 move the abrasive element 20 adjacent to the removal surface 76 from the right, situation that is, for example, diagrammatically shown in FIG. 1, the aforementioned direction of rotation 176 is, advantageously, clockwise.

[0076] In this way, the removal surface 76 is adapted to hit the abrasive element 20 at the perimeter edge 26 causing the abrasive element 20 to move away from the support body 10.

[0077] Advantageously, the displacement device 40 can be configured to move the support body 10 from the predetermined starting inclination i up to a predetermined final inclination f, less than i, during the removal action by group 70 the removal (diagrammatically shown in FIG. 5). In particular, the aforementioned starting inclination can be comprised between 15 and 75, More in particular between 15 and 60, advantageously between 20 and 50, preferably comprised between 25 and 45, for example equal to 30. More in particular, the aforementioned predetermined final inclination f, can be, instead, substantially parallel or parallel to the rotation axis 175, i.e. the surface of the support body 10 from which the abrasive element 20 has been removed, can be substantially parallel to the aforementioned rotation axis 175.

[0078] In an embodiment provided by the invention, the removal surface 76 can be a surface with a high friction. In particular, the removal surface 76 can be a knurled surface or made of a material with a high friction, for example rubber.

[0079] In a preferred embodiment, the removal surface 76 can be equipped with third engagement members, not shown in the figure for simplicity, configured to engage with the second engagement members 23 of the abrasive element 20. For example, the third engagement members can provide, like the first engagement members 13, at least a portion of female Velcro, or male Velcro. In the first case, the second engagement members 23 will be formed by at least a portion of male Velcro. In the second case, instead, the second engagement members 23 will be formed by at least a portion of female Velcro. Analogously, in the case that the first and second engagement members 13 and 23 provide at least a protrusion 13 and at least a recess 23, or vice versa, adapted to provide a snap-engagement with each other, the third engagement members 73 will provide, respectively, a protrusion or a recess.

[0080] The or each removal member 75 can be provided with a cylindrical surface having the generatrices parallel to the rotation axis 175. In this case, therefore, the removal zone 71 is defined downstream of the generatrix at which the displacement device 40 is adapted to move the abrasive element 20 in contact with the removal surface 76.

[0081] In a preferred embodiment of the invention diagrammatically shown for example in FIG. 7, the removal group 70 comprises a first removal member 75a and at least a second removal member 75b adapted to rotate about the rotation axis 175. More in detail, the first and second removal members 75a and 75b are positioned at a predetermined distance d one from the other. In particular, the first and the at least second removal member 75a and 75b can be two distinct bodies mounted on the rotation shaft 77 to the aforementioned predetermined distance d, or belongs to the same cylindrical body on which at least a groove is made having a width equal to the aforementioned predetermined distance d, in particular a circumferential groove 73.

[0082] As diagrammatically shown in particular in the FIGS. 3 to 7, the removal group can comprise, furthermore, a barrier member 80, advantageously positioned downstream of the removal zone 71 with respect to the direction of rotation 176 of the or each removal member 75. Advantageously, the barrier member 80 can be configured to be positioned between the abrasive element 20 and the or each removal member 75 during the removal of the abrasive element 20 da1 support body 10.

[0083] In particular, the barrier member 80 can comprise a main portion 81 from which at least a protruding portion 85 is adapted to protrude in order to be positioned, in use, between the first and the second removal member 75a and 75b, advantageously at the circumferential groove 73.

[0084] As diagrammatically shown in the FIGS. 9 and 10, in an embodiment of the invention, the barrier member 80 can comprise a main portion 81 inclined at a predetermined angle with respect to the rotation axis 175. In particular, from the main portion 81 a first, a second and a third protruding portion 85 can protrude. More in particular, the first protruding portion 85 can be positioned between the first and the second removal member 75a and 75b, whilst the second and the third protruding portion can be positioned at opposite sides with respect to the first and the second removal member 75a and 75b.

[0085] The presence of the barrier member 80 and, in particular, of the protruding portions 85 of this, allows to avoid that once the abrasive element 20 is removed from the support body 10 for the action of the removal surface 76, it can be retained by the same remaining at the or each removal member 75 thus avoiding that a following removal action of another abrasive element 20 can be carried out a. More precisely, the presence of the barrier member 80 avoids that the abrasive element 20 can get caught between two removal members 75a and 75b following to each other, or that can get stuck between them and the shaft causing their rotation about the axis 175 thus requiring to stop the machine for removing the abrasive element 20 by hand.

[0086] In particular, the number of removal members 75 of the removal group 70 can be even more than 2. For example, as diagrammatically shown in FIG. 11, the removal group 70 can comprise a first, a second and a third removal member 75a, 75b and 75c. In this case, the barrier member 80 can comprise a first, a second, a third, a fourth and a fifth protruding portion 85 positioned at the opposite ends of the removal group 70 and between two removal members 75a, 75b and 75b, 75d following to each other, in particular at respective circumferential slots or grooves 73.

[0087] In the further alternative embodiment diagrammatically shown in FIG. 12, the removal group 70 comprises a first, a second, a third and a fourth removal member 75a-75d. In this case, the barrier member 80 can comprise a first, a second, a third, a fourth and a fifth protruding portion 85 positioned at the opposite ends of the removal group 70 and between two removal members 75a, 75b; 75b, 75c and 75d following to each other, in particular at respective circumferential slots or grooves 73. Still as diagrammatically shown in FIG. 12, the barrier member 80 can provide an engagement portion 82 to engage the same to a support surface, for example the internal surface of the container body 120, if present.

[0088] As the skilled person in the art will have no difficult to understand, the number of removal members 75, like the number of protruding portions 85 of the barrier member 80 will be, in general, decided according to the characteristics of the abrasive element 20 to be removed and/or of the type of support body 10, in particular according to the geometric and functional characteristics of these components.

[0089] As diagrammatically shown in the FIGS. 13 and 14, the aforementioned removal group 70 can comprise at least an elastic element 90, for example a linear spring, or a torsional spring. More in particular, the rotation shaft 77 of the or each removal member 75 can be configured to slide, or rotate, with respect to a support structure, for example a wall of the container body 120, opposed by the or each elastic element 90. In this way, the removal group 70 can move with respect to the support structure, but in a controlled way, because corresponding to the elastic force applied by the or each elastic element 90, during the removal action.

[0090] As diagrammatically shown as an example in FIG. 13, the rotation shaft 77 can be mounted on a support structure comprising for example a first and a second bearing 94a and 94b associated respectively to a first and a second support rod 93a and 93b sliding along respective sliding directions 193a and 193b about which a first and a second linear spring 90a and 90b are, respectively, wound. These oppose the aforementioned sliding of the support rods 93a and 93b during the removal action.

[0091] As diagrammatically shown in FIG. 14 with reference to the embodiment of FIG. 13, but the same inventive concept can be, however, applied also to the other embodiments described above and diagrammatically shown in the FIGS. 1 to 16, the or each removal member 75 can comprise a main body, or anima, 71 covered by a layer of the aforementioned material with high friction, or provided with the third engagement members, described above.

[0092] As diagrammatically shown in FIG. 15, the removal group 70 can provide at least a first and a second removal member 75a and 75b configured to rotate about 2 distinct rotation axes 175a and 175b. In particular, the first and the second removal member 75a and 75b can be mounted on respective rotation shafts 77a and 77b operated by a motor or by a respective motor 95a and 95b through a respective motion transmission group 96a and 96b. More in particular, the first and the second removal member 75a and 75b can be adapted to rotate about the respective rotation axes 175a and 175b in a first and in a second direction of rotation opposite to each other. In particular, each removal member 75a and 75b can be associated to a respective barrier member 80a and 80b. Notwithstanding in FIG. 15 only one removal member 75 for each rotation shaft 77 is shown, the skilled person in the art will have no difficult to understand that the embodiments described above with reference to the FIGS. 1 to 14 can be, however, adopted.

[0093] In a possible embodiment of the invention, the removal group 70 can provide at least a removal member 75 configured to rotate about the rotation axis 175 in a first or in a second direction of rotation. This can be, for example, obtained by a motor 95 of electric type by reversing the direction of the current supplied to the windings of the same. This solution can be useful in the applications of the invention in particular typologies of abrasive members 20, in particular having very small thicknesses whereby if the abrasive element 20 is subjected to an inversion of the direction of rotation, it is possible to guarantee that it is disengaged from the support body 10.

[0094] In the further embodiment diagrammatically shown in FIG. 16, the removal group 70 comprises a first and a second rotation shaft 77a and 77b, at least one of which operated by a motor to cause it to rotate about its axis 175. In this case, differently from the embodiments described above, the removal member 75 provided with the removal surface 76 can be a member sliding between the first and the second rotation shaft 77a and 77b. Each rotation shaft 77a and 77b can be provided with at least a cylindrical support member adapted to rotate integrally to the respective rotation shaft 77a and 77b and to support the aforementioned removal member 75.

[0095] It is suitable to note that notwithstanding a lot of the FIGS. 1 to 16 show the abrasive element 20 and the support body 10 having a circular geometry, the present invention can be also applied with analogous advantages also to machine 1 provided with support bodies 10 and abrasive members 20 having a different geometry. At this regard, an as example in FIG. 8 it is diagrammatically shown the case of an abrasive element 20 having a substantially triangular shape applied to a support body having a substantially rectangular geometry.

[0096] The technical solution provided by the present invention and described above with reference to the FIGS. 1 to 16 is particularly effective for machines for finishing surfaces such as grinders, sanders, polishers, etc., where the support body 10 is not blocked to the displacement device and, therefore, during the removal step is free to rotate about a longitudinal axis. The aforementioned technical solution, differently from the prior art solutions, is particularly effective also in the case that the support body 10 and/or the abrasive element 20 is made of a soft material, i.e. pliable, if subject to a determined pressure.

[0097] As diagrammatically shown in FIG. 17, in a further embodiment of the invention, the removal group 70 can, furthermore, comprise a stretching member 72 configured to stretch the abrasive element 20, during its removal by the or each removal member 75. In this way it is possible to avoid that the abrasive element 20 can form folds or wrinkles during the action of the or each removal member 75, situation that could cause the or each removal member 75 to be jammed and, therefore, the need to stop the machine in order to remove the same by hand with a great loss of time and productivity.

[0098] In particular, the stretching member 72, for example substantially cylindrical shaped, can be configured to rotate about a rotation axis 172, advantageously parallel to the rotation axis 175 of the or each removal member 75. More in particular, the stretching member 72 can be configured to rotate about the aforementioned rotation axis 172 in a predetermined direction of rotation 173, advantageously a direction of rotation opposite to the direction of rotation 176 of the or each removal member 75 about its axis 175.

[0099] Advantageously, the stretching member 72 can be positioned at a distance from the support body 10 greater than the or each removal member 75. In particular, the rotation of the stretching member 72 about its rotation axis 172 can be caused by the same motor 95 operating the rotation of the or each removal member 75. This can be obtained, for example, by a motion transmission group 96 configured to transmit to both the rotation shafts 77 and 78 the rotation motion of the motor 95. For example, the rotation group can comprise, according to an embodiment that is not shown in the figures for clarity reasons, a couple of toothed wheels which mesh with each other, one of which operatively connected to the rotation shaft of motor 95, in particular to a pinion mounted on the shaft of the motor 95.

[0100] In an alternative embodiment that is diagrammatically shown in FIG. 18 in the case of a first and a second removal member 75a and 75b, each rotation shaft 77 and 78 can be operated by a respective motor 95 and 95.

[0101] Advantageously, the stretching member 72 can be made of a material having a high friction coefficient, for example rubber, or can be covered by a layer of the aforementioned material. Alternatively, the stretching member 72 can be provided with rilievi, for example obtained by knurling. In this case, the stretching member 72 can be made of a plastic or metallic material.

[0102] As diagrammatically shown in the FIGS. 19 and 20, in a further alternative embodiment of the invention, a blocking device be, 90 can furthermore, provided configured to block the rotation of the support body 10 about its rotation axis 101 during the removal of the abrasive element 20. In particular, the blocking device 90 can be configured to act from the side of the abrasive surface 22. More in particular, the blocking device 90 can comprise a support portion 91 and a contact portion 92, advantageously rotatably connected to the support portion 91, for example by a hinge 95, in such a way to be free to rotate about a rotation axis 195. More precisely, during the removal action by the removal group 70, the support portion 91 is adapted to translate from/towards the abrasive element 20 to force the contact portion 92 against the abrasive surface 22. In this way, during the removal action, the contact portion 92 rotates about the rotation axis 195 and exerts a blocking action of the rotation of the support body 10 about the rotation axis 101.

[0103] In an embodiment that is not shown in the figures for simplicity, the blocking device 90 can be configured to exert the blocking action of the rotation of the support body 10 about the rotation axis 101 from the opposite side with respect to the abrasive element 20.

[0104] According to another embodiment, instead, the blocking of the rotation of the support body 10 about the rotation axis 101 can be obtained by blocking, for example by a control group, the rotation shaft, or a transmission gear, which causes its rotation.

[0105] In particular, a check apparatus, not shown in the figures for simplicity, can be, furthermore, provided configured to check the presence or absence of the abrasive element 20 at the support body 10. More in particular, the check of the presence or absence of the abrasive element 20 on the support body 10, can provide that the aforementioned displacement device 40 moves the support body 10, and, if present, the abrasive element 20 to it engaged, in contact with a control surface of a control member. Then, the displacement device 40 is operated in such a way to cause the support body 10 to move, for example to translate along a predetermined direction, or to rotate, or a combination of movements. In general, however, the displacement device 40 can be adapted to apply a predetermined force, in particular a detachment force, to move the support body 10 away from the control member.

[0106] More in particular, the check apparatus also provides a detection device configured to detect any engagement between the support body 10 and the aforementioned control member. In particular, the detection device is configured to carry out the aforementioned detection, once that the support body 10, or the abrasive element 20 that is in case engaged to it, has been positioned in contact with the control member and has been moved by the displacement device 40. More in detail, in a possible embodiment, the detection device can be configured to detect the force applied by the displacement device 40 on the support body 10, or the control member, to move the support body 10 with respect to the control member. The detection device can, advantageously, comprise at least a movement sensor and/or at least an accelerometer and/or at least a rotation sensor and/or at least an encoder and/or at least a limit position sensor.

[0107] Preferably, the check apparatus can be of the type described in WO2021/005499 in the name of the same Applicant.

[0108] As diagrammatically shown in figure, a reference surface 61 can be, furthermore, provided having a known spatial position. In particular, the displacement device 40, advantageously before positioning the abrasive element 20 at the or each removal member 75 can be configured to position the abrasive surface 22 of the abrasive element 20 adjacent to the reference surface 61. The displacement device 40, in particular a control group associated to it, acquire, then, the known spatial position of the reference surface 61 as spatial position of the abrasive surface 22. In this way, it is possible to know with high accuracy the spatial position instant by instant of the abrasive element 20 engaged to the support body 10 during its movement by the displacement device 40.

[0109] Notwithstanding in the FIGS. 1 to 20, the collecting container 120 is always shown having an inlet mouth 125 positioned at a top wall 121 of the container body 120, in an alternative embodiment of the invention that is diagrammatically shown in FIG. 21, the inlet mouth 125 of the collecting container 120 can be positioned at a lateral wall 122 of the container body 120.

[0110] In particular, the collecting container 120 can be provided with at least a guide wall 123 configured to guide the removed abrasive element 20 towards the inlet mouth 125 of the collecting container 120.

[0111] As diagrammatically shown in FIG. 21, an embodiment provided by the invention, the reference surface 61 can be positioned close to the rotation shaft 77 of the or each removal member 75, for example at one or more support members 60 of the same.

[0112] In the FIGS. 22 to 26 further embodiments of the apparatus 100, according to the invention, for removing the abrasive element 20 from the support body 10, are diagrammatically shown. More in detail, in the embodiment diagrammatically shown in the FIGS. 22 to 26, the removal surface 76 of the removal member 75 is substantially flat. For example, the removal member 75 can be a disc configured to rotate about the rotation axis 175, in particular coaxially to the aforementioned disc 75.

[0113] Preferably, as anticipated above for the embodiment where the removal surface 76 era substantially cylindrical, also in this case, the removal member 75 can be provided with at least a groove 73 coaxial to the rotation axis 175. In particular, in the case of disc 75, each groove 73 is preferably a circular groove. In general, the disc 75 will be provided with a plurality of circular grooves 73. Therefore, the different removal portions in which the circular grooves 73 divides the removal member 75 form the aforementioned removal surface 76 substantially flat.

[0114] As shown in detail in the FIGS. 25 and 26, also in this case is, advantageously, provided at least a barrier member 80 positioned downstream of the removal zone, or however of the beginning of the removal, of the abrasive element 20 and comprising at least a protruding portion 85, preferably a plurality of protruding portions, each of which configured to be positioned between two removal portions 76 following to each other of the removal member 75, that means at a respective circular groove 73. In this way, on the one hand, the presence of the barrier member 80 does not hamper the rotation of the removal member 75 about the rotation axis 175. The combined action of the removal surface 76, which pushes on the abrasive element 20 once that is removed from the support body 10, and the barrier member 80 causes the abrasive element 20 removed from the support body 10, to move away from the removal zone.

[0115] The main portion 81 of the barrier member 80 can be inclined at a predetermined angle with respect to the rotation axis 175 of the removal member 75. In particular, angle can be comprised between 10 and 80, advantageously between 20 and 60, preferably between 30 and 50, for example equal to 45.

[0116] As diagrammatically shown in the FIGS. 23 to 26, the apparatus 100 for removing an abrasive element 20 from a support body 10, according to the invention, provides a support frame 105 on which the removal member 75 and the related operating devices are mounted, in particular the motor 95 and the transmission gears 96 which transmit the motion of the motor shaft 95 about the axis 195 of the removal member 75 to cause the rotation about the rotation axis 175. In particular, also the barrier member 80 can be mounted on the aforementioned support frame 105.

[0117] The foregoing description of a specific embodiment will so fully reveal the invention according to the conceptual point of view, so that others, by applying current knowledge, will be able to modify and/or adapt for various applications such an embodiment without further research and without parting from the invention, and it is therefore to be understood that such adaptations and modifications will have to be considered as equivalent to the specific embodiment. The means and the materials to realise the different functions described herein could have a different nature without, for this reason, departing from the field of the invention. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation.