Abstract: An apparatus for checking mechanical component parts, such as tools in machine tools, uses optical devices for emitting and receiving a light beam, for example a laser beam, and sensors for detecting the interruption of such light beam. A protection device for at least one of the optical devices includes pneumatic conduits and a nozzle outputting an air stream from a plurality of holes located around the central conduit through which the light beam passes, so generating a tubular shield which embraces the light beam. The protection device further includes a shutter which can be displaced from a rest position, wherein the central conduit is closed and the inside of the protection device is pressurized, to a working position, wherein the nozzle delivers the air stream in the form of a tubular shield. Passing from the rest position to the working position, the shutter assumes an intermediate transit position in which an air blast is outputted through the central conduit for a short time interval.

Abstract: An apparatus for checking the diameter of crankpins of a crankshaft in the course of the machining in a grinding machine includes a Vee-shaped reference device, a measuring device associated with the reference device and including a feeler axially movable along the bisecting line of the Vee-shaped reference device, and a support device with a first arm rotating with respect to a support arranged on the grinding-wheel slide and a second arm rotating with respect to the first and carrying the Vee-shaped reference device. A guiding mechanism includes a limiting device, with mutually abutting surfaces and coupled to the support device, that guides the displacement of the reference device along a trajectory substantially parallel to the profile of the grinding wheel, allows the engagement of the reference device on a crankpin to be checked while the latter is orbitally moving, and does not interfere with the displacements of the support device caused by the orbital motion of the crankpin in the checking condition.

Abstract: An apparatus for checking the diameter of crankpins of a crankshaft in the course of the machining in a grinding machine includes a Vee-shaped reference device, a measuring device associated with the reference device and including a feeler axially movable along the bisecting line of the Vee-shaped reference device, and a support device with a first arm rotating with respect to a support arranged on the grinding-wheel slide and a second arm rotating with respect to the first and carrying the Vee-shaped reference device. A guiding mechanism includes a limiting device, with mutually abutting surfaces and coupled to the support device, that guides the displacement of the reference device along a trajectory substantially parallel to the profile of the grinding wheel, allows the engagement of the reference device on a crankpin to be checked while the latter is orbitally moving, and does not interfere with the displacements of the support device caused by the orbital motion of the crankpin in the checking condition.

Abstract: A head for the linear dimension checking of mechanical pieces including a casing, an arm carrying a feeler for touching the mechanical piece to be checked, a fulcrum for enabling displacements of the arm with respect to the casing and a transducer for providing signals depending on the position of the arm with respect to the casing. Various components of the head can be adjusted and/or replaced from the exterior of the casing. The transducer is of the inductive, half-bridge type, with multiple windings. An integral element for the electric connection to a processing unit includes the windings of the transducer, a cable and a connector. A checking apparatus, including at least a gauging or measuring head, includes a stationary structure and at least a support structure for the head, coupled to the stationary structure in an adjustable and removable way.

Abstract: A method and an apparatus for balancing an elongate structure (1) rotating about an axis, like a spindle (3) carrying two grinding wheels (5, 6), wherein two vibration-detecting sensors (7, 8) and associated balancing devices (9, 10) with movable masses (11-14) are arranged at two checking sections (S1, S2) spaced out along the axis of rotation. Processing and control means (20) control the balancing devices on the basis of one or more signals (VC; VC1, VC2) achieved as combination(s) of the vibrations, in module, detected by both the sensors.

Abstract: A linear inductive transducer (T) includes a pair of primary windings (1, 3), fed by means of a power supply unit (C; 11, 13), a pair of secondary windings (2, 4) and a magnetic core (8), movable with respect to the windings. The secondary windings are electrically connected at an intermediate connection point between the primaries, and the transducer provides an electric output signal (Vo) as the sum of two components (Vs, Vs′), both variable as the mutual position between the windings and the core changes, and that depend on variations of the inductance of the primary windings and mutual inductance between the primaries and the secondaries, respectively. According to a specific configuration, it is also possible, starting from a single structure and by varying, in substance, the power supply and the output connections, to attain a transducer (T′) with different functional characteristics (for example, of the differential transformer type, half bridge type, or of another type).

Abstract: Gauging head and apparatus for linear dimension checking of mechanical pieces comprising an integral element that defines an arm carrying a feeler, a reference portion, and a fulcrum that enables rotations of the arm with respect to the reference portion, and a differential transformer position transducer with a cylindrical shaped casing, carrying windings, fixed to the reference portion, and a ferromagnetic core movable together with the arm. The integral element is locked in an adjustable way to a support by means of the cylindrical casing. The integral fulcrum is achieved by work hardening the material and subsequently grinding it.

Abstract: A touch probe with a base unit comprising a casing, a movable arm-set assembly housed in the casing and provided with an arm protruding from the casing and a feeler fixed to the arm end external to the casing, and an adjustment and locking device for locking the base unit to a support. In order to adjust the position of the feeler, the adjustment and locking device comprises a first and a second reference element with substantially spherical couplings between the base unit and the support and two locking elements, coupled to the base unit and to the support, and adjustable along a longitudinal direction. At least the first of the reference elements is adjustable along the longitudinal direction.

Abstract: An apparatus for balancing the grinding wheel (2) of a grinding machine, comprising an assembly coupled to and rotating with the wheel and including masses (24, 26) the position of which is adjustable and electrical motors (28, 30) to control adjusting movements of the masses. The electrical connection between the motors and a survey and processing unit (16) including a power source (40) is provided by slip rings (48) and brushes (54). The brushes are fixed to a movable support (52). A spring (58) acts on the movable support to space the brushes apart from the slip rings. An actuator including, for example, electromagnets (60) acts on the movable support to perform the contact between the brushes and the corresponding slip rings.

Abstract: A camshaft checking apparatus, in particular for checking the parameters of the profiles of cams, comprising a support structure and a motor means for positioning and axially rotating the shaft, linear transducers for determining radial dimensions of cams in the course of the rotation, a measuring head for cooperating with a reference portion of the camshaft and locating an angular shaft reference position, a rotary transducer for defining said angular position and angular measuring positions, and a control unit for receiving and processing signals arriving from the linear transducers, measuring head and the rotary transducer.

Abstract: An apparatus for checking linear dimensions of mechanical parts comprises a bed, a longitudinal slide and two transverse slides arranged on the longitudinal slide and carrying relevant sensing elements adapted to touch the part to be checked. In order to obtain flexibility and quickness of operation, first and second reference rests for relevant parts are positioned on the bed and the transverse slides carry sensing elements having an arrangement substantially symmetrical with respect to a transverse symmetry plane. The apparatus is particularly suitable for checking parts after a first and, respectively, a second machining operation.

Abstract: A measuring head comprises an integral member defining a support portion, a plurality of fulcrums and a corresponding plurality of movable arms carrying feelers. The fulcrums are aligned for defining a single axis of rotation for the movable arms. Position transducers electrically detect the positions of the movable arms. Two measuring heads are employed for realizing a snap gauge for simultaneously checking a plurality of diameters.

Abstract: An apparatus for checking the roundness of parts comprises a basement supporting a motorized spindle for rotating the part to be checked about a horizontal axis, a stanchion fixed to the basement, a control lever and a support element rotatably coupled to the stanchion for rotation about relevant horizontal axes, measuring device coupled to the lever and the support element, and processing device. The measuring device comprises a member vertically suspended to the lever and rotatably coupled to the support element, a Vee device fixed to the member and adapted to be arranged upon the part and two measuring heads with movable feelers adapted to contact diametrically opposed points of the part. The processing device is connected to the measuring heads for providing measurements of the out-of-roundness and of the diameter of the part.

Abstract: A cartridge gauging head for checking linear dimensions of parts comprises a tubular casing, a shaft axially movable with respect to the casing, a feeler fixed at an end of the shaft for contacting the part to be checked, a transducer for providing a signal depending on the mutual positions of the shaft and the casing, and a guide member for guiding the axial displacements of the shaft. The guide member includes an intermediate portion coupled to the casing and two end portions adapted to cooperate with the shaft for guiding it.

Abstract: A drawer for electrical cabinets comprises a frame and a front wall coupled to the frame and including at least one removable panel. In order to provide a modular, cheap and easily assemblable structure, the front wall supports elongated resilient coupling elements and the panel or panels have stop surfaces that can be coupled to the resilient coupling elements through a snap action by applying a front thrust to the panel, from the outside of the drawer.

Abstract: A snap gauge comprising support means; a substantially U-shaped integral member defining two movable arms carrying feelers for contacting a workpiece to be measured; transducer means coupled to the movable arms; and a Vee reference device for cooperating with a cylindrical surface of the workpiece. A rotatable pin couples the Vee reference device to the support means and permits adjustment of the position of the Vee reference device along a longitudinal direction. The gauge further comprises protective devices including a U-shaped element arranged internally with respect to the integral member, two protective elements coupled to radially bent ends of the U-shaped element, and two protective half-shells coupled to the support means.

Abstract: A gauging head for checking linear dimensions of mechanical parts comprising a substantially cylindrical casing, a stem partially arranged for sliding movement within the casing, a feeler coupled to an end of the stem external with respect to the casing for touching the part, a transducer for providing a measurement signal and a cable for connecting the transducer to an external electric unit. An additional element can be removably and adjustably coupled to the casing for limiting the pre-stroke of the stem and another additional element can be removably coupled to the casing for defining the direction of exit of the cable from the gauging head.

Abstract: An apparatus for measuring dimensions, in particular diameters and axial dimensions of parts with rotational symmetry, comprises a support, a system of slides movable with respect to the support, motors for displacing the slides, transducers adapted to provide signals indicative of the positions of the slides and measuring means carried by the system of slides. In order to perform, accurately and quickly, measurements on different types of parts, the system of slides comprises a longitudinal slide and two slides movable simultaneously and symmetrically along the same transversal directions. The measuring means comprise two measuring heads each of which is fixed to a relevant transversal slide and adapted to measure both in longitudinal and transversal directions. The measurements of the parts are obtained by combining the signals of the transducers and those provided by the measuring heads.

Abstract: Head for checking linear dimensions of workpieces comprising a support, a movable arm carrying a feeler adapted to touch the workpiece to be checked and three members substantially perpendicular to a longitudinal geometric axis of the head. One of the members is fixed to the support, another member carries the arm and the third member is intermediate to the first two members. Arranged between adjacent members are two pairs of balls, which are aligned along paralllel axes, glued to one member and housed in conical recesses obtained in the other member, and which define two axes for mutual rotation between the adjacent members and are always maintained into contact with the surfaces of the relevant conical recesses by means of springs. An electrical circuit, closed in rest conditions, comprises two pairs of electrical contacts, which open the circuit as a consequence of displacements of the movable arm along opposite directions or as a consequence of an axial displacement of the movable arm.

Abstract: Electronic gauge for checking linear dimensions of mechanical pieces, comprising a casing, at least a movable arm, a position transducer and a retraction device. The retraction device includes an electromagnet fixed to an element supported by the casing, a flat armature adjustably fixed to the movable arm and a positive stop fixed to the armature and adapted to abut against another positive stop fixed to the electromagnet.