Abstract: A modular structure (1) for temporary exhibitions which comprises at least one shaft component (2), at least one sheet (3) with at least one fixed end (3a), which is fastened to the shaft component (2) and at least one free end (3b) opposite the fixed end (3a), and a releasable fastening mechanism (11) capable of fixing the free end (3a) to the shaft component (2) and in which the shaft component (2), comprises a rolling device suitable for rolling the sheet (3).

Abstract: Provided herein is an apparatus for detecting vibrations in a machine tool having a rotor portion (2) which is provided with tool members (5) and defines an axis of rotation (2a), the apparatus comprising a sensor assembly (3) which is able to rotate together with the rotor portion (2) and is designed to issue signals correlated to the vibrations, and a supporting and amplification device (6) for supporting the sensor assembly (3) and for amplifying the vibrations, which is set between the sensor assembly (3) and the rotor portion (2) and has a rotational asymmetry about the axis of rotation (2a) for any angle smaller than a full circle.

Abstract: A modular structure (1) for temporary exhibitions comprises at least one shaft component (2), at least one sheet (3) with at least one fixed end (3a), which is fastened to the shaft component (2) and at least one free end (3b) opposite the fixed end (3a), and a releasable fastening mechanism (11) capable of fixing the free end (3a) to the shaft component (2) and in which the shaft component (2), comprises rolling means (6) for the sheet (3).

Abstract: A precision sensor assembly for rotating members in a machine tool comprises a rotor unit (16) rigidly fixed to a rotor portion (2a) of the machine tool and including a sensor (5) for detecting vibrations produced by the operation of the machine tool, the sensor (5) comprising a piezoelectric sensitive element (6) and members (7, 8) for mechanical amplification of the vibrations. The members (7, 8) comprise at least one resonant system composed of an elastic element (8) and a counter-mass (7) acting on the piezoelectric sensitive element (6). The rotor and stator units (16, 17) comprise inductively coupled transmitting and receiving elements (10, 11) for transferring the signals from the piezoelectric element (6) contactless to the stator unit (17). The stator unit (17) may include an electric amplifier (13) for further amplifying the transmitted signals.

Abstract: A feeler device (1) of workpieces being machined, in particular for measurement instruments (2) of workpieces being machined on machine tools, of the type comprising a head (7) including control and measurement members, and a pivoting arm (6) extending in an operating position between the head (7) and a workpiece (3) being machined, the pivoting arm (6) comprising a pivot (10), a base portion (11) extending between the head (7) and the pivot (10), and an end portion (12) extending between the pivot (10) and the workpiece (3) being machined, control means (13) of the pivot (10) being provided, to allow movements between the base portion (11) and the end portion (12) in the event of forcing on the end portion (12).

Abstract: A feeler device (1) of workpieces being machined, in particular for measurement instruments (2) of workpieces being machined on machine tools, of the type comprising a head (7) including control and measurement members, and a pivoting arm (6) extending in an operating position between the head (7) and a workpiece (3) being machined, the pivoting arm (6) comprising a pivot (10), a base portion (11) extending between the head (7) and the pivot (10), and an end portion (12) extending between the pivot (10) and the workpiece (3) being machined, control means (13) of the pivot (10) being provided, to allow movements between the base portion (11) and the end portion (12) in the event of forcing on the end portion (12).

Abstract: Provided herein is an apparatus for detecting vibrations in a machine tool having a rotor portion (2) which is provided with tool members (5) and defines an axis of rotation (2a), the apparatus comprising a sensor assembly (3) which is able to rotate together with the rotor portion (2) and is designed to issue signals correlated to the vibrations, and a supporting and amplification device (6) for supporting the sensor assembly (3) and for amplifying the vibrations, which is set between the sensor assembly (3) and the rotor portion (2) and has a rotational asymmetry about the axis of rotation (2a) for any angle smaller than a full circle

Abstract: A precision sensor assembly for rotating members in a machine tool comprises a rotor unit (16) rigidly fixed to a rotor portion (2a) of the machine tool and including a sensor (5) for detecting vibrations produced by the operation of the machine tool, the sensor (5) comprising a piezoelectric sensitive element (6) and members (7, 8) for mechanical amplification of the vibrations. The members (7, 8) comprise at least one resonant system composed of an elastic element (8) and a counter-mass (7) acting on the piezoelectric sensitive element (6). The rotor and stator units (16, 17) comprise inductively coupled transmitting and receiving elements (10, 11) for transferring the signals from the piezoelectric element (6) contactless to the stator unit (17). The stator unit (17) may include an electric amplifier (13) for further amplifying the transmitted signals.

Abstract: The apparatus (1) comprises at least two balancing rings (10) disposed in axial side by side relationship and coaxial with each other on the rotating body (13) to be balanced. The rings (10) are each unbalanced and rotatable with the rotating body (13), but can each be angularly rotated relative to the latter through positioning members. These members may comprise either a gear (29) that can be selectively engaged in rotation with peripheral toothings (28) of the rings (10) when the rotating body (13) is stopped, to bring the rings (10) to a relative angular position to which the situation of balance of the rotating body (13) corresponds, or locking elements to be selectively engaged with peripheral notches in the rings (10) to retain the rings (10) one by one while the rotating body (13) is rotated relative to the rings (10) through such an angle that the angular balance position is achieved.

Abstract: The apparatus (1) comprises at least two balancing rings (10) disposed in axial side by side relationship and coaxial with each other on the rotating body (13) to be balanced. The rings (10) are each unbalanced and rotatable with the rotating body (13), but can each be angularly rotated relative to the latter through positioning members. These members may comprise either a gear (29) that can be selectively engaged in rotation with peripheral toothings (28) of the rings (10) when the rotating body (13) is stopped, to bring the rings (10) to a relative angular position to which the situation of balance of the rotating body (13) corresponds, or locking elements to be selectively engaged with peripheral notches in the rings (10) to retain the rings (10) one by one while the rotating body (13) is rotated relative to the rings (10) through such an angle that the angular balance position is achieved.

Abstract: It is disclosed a device for axial stopping of a rotor, in particular an armature of an electric motor, for balancing machines, the device comprising a thrust unit having an abutment surface (8) adjacent to an end face (4b) of the support shaft (4) of the rotor (5) and adapted to exert on the end face (4b), a repulsive force which is able to keep an interstice (1a) between the abutment surface (8) and the end face (4b), the thrust unit comprising fluid-emitting means (9) suitable to form a layer of fluid between the abutment surface (8) and the end face (4b).

Abstract: The device comprises at least two annular balancing elements (10) each having an unbalance and disposed in axial side by side relationship and coaxial with each other on the rotating body (6) to be balanced. The annular elements (10) are rotatable with the rotating body (6) but can be angularly rotated relative to the body (6) during rotation thereof. For this purpose, at least one pair of nozzles (16) is provided for sending fluid jets, in particular air or cooling liquid jets, onto the annular elements (10) tangentially thereof, more specifically onto radial fins of the annular elements (10), to temporarily speed them up or slow them down with respect to the rotating body (6), until reaching of an angular position at which the resultant unbalance vector of the annular elements (10) compensates for the unbalance vector of the rotating body (6).

Abstract: It is provided a support and guide device for small machine tools, in particular for rotating-mass balancing machines, comprising: a base element (2), at least one moving element (3) in engagement with the base element (2), support elements (4) for the moving element (3), and drive members (5) controlling shiftings of the moving element (3), the support elements (4) comprising at least one elastically deformable thin sheet (7) oscillatably supporting the moving element (3), and the drive members (5) being active on the moving element (3) to shaft the latter against the action of the elastically deformable thin sheet (7).

Abstract: The process contemplates material removal from the surface of rotating bodies (11) by moving at least one milling cutter (5) along an arched trajectory (21) in a plane transverse to the axis of the bodies, so as to remove the material in the circumferential direction of the body surface and parallel to the axis of the milling cutter (5). This working can be carried out in addition to a vectorial milling. The trajectory (21) is obtained by composing two linear translations perpendicular to the milling cutter (5) by adjustment of the speed and the rotation direction of the motors producing such translations.

Abstract: The device comprises at least two annular balancing elements (10) each having an unbalance and disposed in axial side by side relationship and coaxial with each other on the rotating body (6) to be balanced. The annular elements (10) are rotatable with the rotating body (6) but can be angularly rotated relative to the body (6) during rotation thereof. For this purpose, at least one pair of nozzles (16) is provided for sending fluid jets, in particular air or cooling liquid jets, onto the annular elements (10) tangentially thereof, more specifically onto radial fins of the annular elements (10), to temporarily speed them up or slow them down with respect to the rotating body (6), until reaching of an angular position at which the resultant unbalance vector of the annular elements (10) compensates for the unbalance vector of the rotating body (6).

Abstract: The process contemplates material removal from the surface of rotating bodies (1) by moving at least one milling cutter (5) along an arched trajectory (21) in a plane transverse to the axis of the bodies, so as to remove the material in the circumferential direction of the body surface and parallel to the axis of the milling cutter (5). This working can be carried out in addition to a vectorial milling. The trajectory (21) is obtained by composing two linear translations perpendicular to the milling cutter (5) by adjustment of the speed and the rotation direction of the motors producing such translations.

Abstract: It is disclosed a device for axial stopping of a rotor, in particular an armature of an electric motor, for balancing machines, the device comprising a thrust unit having an abutment surface (8) adjacent to an end face (4b) of the support shaft (4) of the rotor (5) and adapted to exert on the end face (4b), a repulsive force which is able to keep an interstice (1a) between the abutment surface (8) and the end face (4b), the thrust unit comprising fluid-emitting means (9) suitable to form a layer of fluid between the abutment surface (8) and the end face (4b).

Abstract: An apparatus (1) for balancing a rotating body by material addition is disclosed which comprises dispensing means for supplying a balancing material to be applied to the rotating body, the balancing material consisting in a semifluid product (6) susceptible of being dried, as a not yet polymerized resin, and the apparatus comprising a dispensing unit (7) for dispensing measured quantities (9) of the not yet polymerized resin on the rotating body, and a stabilizing unit (14) for catalyzing the polymerization of the resin after dispensing of the same.

Abstract: A measuring apparatus (1) is provided which has two arms (8) connected to a protection casing (6) through fulcrums (9). Associated with the arms (8), externally of the casing (6), are feeler pins (10) adapted to come into contact with the workpieces (3) and, internally of the casing (6), sensors (11) for measuring the oscillations of the arms (8). Also provided are driving members adapted to exert at least one contact force and one release force tending to rotate the arms (8) in opposite directions and comprising at least one magnet (13) adjacent to the arms (8), magnetic locators (14) integral with the arms (8) and having active faces (14a) turned towards the magnet (13), and drive elements (15) adapted to selectively vary the magnet (13) polarities turned towards the magnetic locators (14).

Abstract: A moving-weight, dynamic balancing apparatus for a rotary machine, in particular an industrial fan, having a rotary shaft, and at least one rotor carried by the rotary shaft and provided with main rotor bearings to allow rotary movement thereof. The balancing apparatus includes at least one moving-weight balancing unit is carried by the rotary shaft, and at least one monitoring and correcting system having a drive assembly. The at least one monitoring and correcting system monitors and corrects the unbalanced state of the rotor, and acts continuously on the at least one moving-weight balancing unit when the rotor is rotating to monitor and correct for rotor unbalance. The at least one moving-weight balancing unit has at least two balancing masses mounted to be movable under drive from the drive assembly controlled by the monitoring and correction system.