Abstract: A measuring and control apparatus for internal grinding machines with resting shoes for cooperating with the outer surface of a workpiece, including a control device for controlling the displacement of the grinding wheel relative to the workpiece, with devices for measuring the displacements; and measuring devices for carrying out measurements of linear dimensions of the workpiece, the devices means for measuring dimensions of the workpiece including a first measuring device adapted to provide a signal responsive to the value of the diameter of said outer surface of the workpiece. The control device is connected to the device for measuring the dimensions of the workpiece for receiving the signal from the measuring device and for controlling the displacement of the grinding wheel relative to the workpiece depending on the signal itself, for the grinding of an inner surface of the workpiece concentric with said outer surface.

Abstract: Apparatus for measuring geometrical dimensions and/or errors on a mechanical part which includes a base, first and second supports, measuring devices, a first activating device coupled with the second support to control relative displacement between the two supports in order to cause feelers to cooperate with respective portions of the part, a locking device supported by the base to lock the part during measurement, a second activating device adapted to cause relative movement between the part and the measuring devices to permit feelers to explore respective portions of the part, a processing device to process signals supplied by transducers during the exploration of feelers on the part, thrust arms associated with the first support to support the part, first reference elements associated with the second support to cooperate mechanically with the part and push it towards the first support after the action of the first activating device overcomes the action of the thrust arms, second reference elements associa

Abstract: An apparatus for measuring the taper and the out-of-roundness of a revolutionary surface of a workpiece, comprising a frame, at least two measuring devices carried by the frame which have moving feelers adapted to cooperate with two points of different cross-sections of the revolutionary surface and two measurement transducers adapted to provide signals responsive to the position of the feelers, and detecting and processing means connected to the transducers for providing the desired measurements. The measuring devices comprise a common support for the feelers; coupling means, arranged between the support and the frame for permitting displacements of the support with the feelers for carrying out the measurements.

Abstract: Apparatus for measuring errors in concentricity relative to first and second coaxial surfaces of rotation formed within a hole of a mechanical part which includes a first support for the part, a second support, a first mechanical reference element supported by the second support to cooperate with the first of the surfaces of rotation, a measurement device associated with the first mechanical reference element to cooperate with the second surface of rotation and effect dimensional measurements thereon, second mechanical reference elements supported by the second support and rigidly connected to the first mechanical reference element, a rigid member connected to the first mechanical reference element, a wire and a spring interconnecting the second support and the rigid member, a spring arranged between the first and second mechanical reference elements and the second support to permit simultaneously the first mechanical reference element to remain in contact with the first surface of rotation and the second mec

Abstract: A measuring and control method to check the position and/or wear of a knife element supporting a piece being machined in centerless grinders including foreseeing the generation of signals responsive to the position of the workpiece surface close to the supporting knife element and comparing the signals with reference signals depending on the workpiece size and the optimum position of the supporting knife element. The result of the comparison is responsive to the real position and/or wear of the supporting knife element. A device for the method which comprises a gauge for measuring linear dimensions having at least one moving element adapted to cooperate with the surface of the piece being machined. The moving element is associated to position transducer means connected with threshold circuits to control alarm and control circuits, the control and alarm circuits being responsive to the wear and/or position of the supporting knife element.

Abstract: A method for checking the rotation of mechanical workpieces which includes the steps of measuring the workpiece size, processing the measuring signals occurring to generate at least one signal responsive to the measurement of size variations of the workpiece and utilizing the signal for generating control signals to indicate the evenness of the rotation of the piece. An apparatus for practicing the method includes feelers adapted to be brought to the measuring position on the workpiece to supply signals responsive to the size, a processing unit adapted to process the measuring signals detected at succeeding moments to supply information on the geometrical features of the workpiece or its variations, delay and timing units to trigger the processing unit connected with the output of the processing unit and adapted to compare the signals at the output itself with preset reference signals and a consent unit connected with the comparison unit operable as a result of the evenness of the workpiece rotation.

Abstract: The present invention relates to a method and apparatus for detecting the geometrical features of mechanical workpieces, particularly for measuring eccentricity and out-of-roundness of cylindrical and revolution surfaces in which at least two size checks on relevant sections of the cylindrical surface and at least two size checks on the same section of the revolution surface are carried out and the data resulting from the checks are processed to supply an indication of the eccentricity of the two surfaces and of the roundness of the section of the revolution surface. The apparatus includes a plug carrying feelers which is automatically positioned with respect to a workpiece and then revolved, so that feelers carry out measurements. The apparatus is used for checking valve guide holes and valve seats of engines and similar workpieces.

Abstract: The invention relates to logic systems used for controlling industrial processes and consists in a monitoring apparatus for checking the regularity of the operation of a logic system, in order to increase its safeness. The apparatus comprises a source of a clock signal, a series of comparison units for comparing logic signals, a detecting device including a counter for checking the presence of the clock signal at the output of the series of comparison units, a checking system means for simulating an alarm state and consent system for making the operation of the logic system depend on the working conditions of the monitoring apparatus. The invention is particularly useful for increasing the safeness of the operation of logic systems for machine tools.

Abstract: A measuring device for checking mechanical pieces either while stationary or rotating which includes a first feeler substantially fixed with respect to a support and in alignment with a measuring head having a second feeler and supported by the support, a commutation unit containing a shaft and cams for changing the support and an electrical unit for detecting and visually recording the diameters and geometrical errors. In a first working condition the support of the measuring device can oscillate in order to allow both the first and second feeler to remain in contact with the piece to be gauged. The commutation unit allows for a change from the first working condition for measuring diameters of the work piece through the first and second feelers to a second working condition for measuring geometrical errors of a piece through the second feeler.

Abstract: A wide-range device for measuring the sizes of mechanical pieces which includes at least one measuring head, a support for said at least one measuring head with a narrow-range measuring transducer, a D.C. motor, a position transducer with reciprocally moving elements having a scale with equidistant reference positions, a position servo-system to position a reference element integral with the measuring head in correspondence with one of the reference positions of the scale, a reader connected to the measuring head to indicate the measure in intervals comprised between the reference positions of the scale and circuits to control the motor.

Abstract: An apparatus for controlling a machine tool which includes a measuring head for measuring a dimension (i.e. a diameter) of a workpiece, a detector for detecting and holding the maximum dimension measured by the measuring head, a circuit for determining the mean dimension of a plurality of measurements, a circuit for determining the dispersion between the measured dimensions and the mean, and a counter for inhibiting the control operation until a predetermined minimum number of workpieces have been measured.

Abstract: A dimension measuring device for mechanical workpieces at the exit of a machine tool, comprising collection and guide means for the workpieces at the exit of the machine, and a measuring member disposed on the collection and guide means for measuring each of the workpieces as it passes the member; the measuring member itself comprises a contact element, resilient means for thrusting the contact element against the workpiece to be measured and power dissipation means connected to the contact element for making the contact element follow the profile of the workpiece which passes and for preventing the contact element from rebounding in consequence of the impacts of the workpieces.

Abstract: Apparatus for checking the cutting capacity and controlling the dressing of a grinding wheel comprising a device to measure the sizes of the pieces being machined, a threshold unit connected to the output of the device responsive to the device, a processing group containing an integrating and memory circuit to integrate and store signals for every piece being machined, a switch associated with the integrating and memory circuit and controlled by the threshold unit, a threshold circuit the input of which is connected to the switch and the output to the processing group and a threshold device to control dressing of the grinding wheel connected to the output of the processing group. The apparatus may include a program unit to set the values of the feed speed of the wheelhead, a unit to calculate stock removal speed and a unit to compare stock removal speed with programmed speed.

Abstract: A movable measuring system for a gauge of the direct feeling type including first and second movable elements supported by a frame and supporting in turn respective feelers adapted to contact the workpieces to be measured, substantially rigid members associated with the movable elements and joined together through a link adapted to allow displacements of the feelers and of the movable elements and to transform them into displacements comprising rotations of the rigid members around an axis defined by the link and a transducer to detect the displacements of the axis. The movable elements are displaceable to allow the feelers to approach and to move away from each other. The axis is on its turn movable with respect to the frame. The transducer has a movable element suspended to an inextensible wire stretched by a spring connected between the movable element of the transducer and the frame of the gauge. The wire is adapted to move longitudinally according to the displacements of the axis defined by the link.

Abstract: A gauge for measuring the sizes of mechanical workpieces including a support frame, movable feelers adapted to touch the work to be measured, a flexible lamina associated with the feelers, electrical position transducers having displaceable movable elements, at least one inextensible axially movable wire connecting the lamina to the movable elements of the transducer. The movement of the feelers in turn move the lamina, wire and movable transducer element whereby an output signal is generated responsive to the axial position of the wire.

Abstract: A method and apparatus for the precision measurement of the longitudinal development of seats of mechanical workpieces such as side seals for Wankel engines whereby an inextensible element of known length slightly smaller than the theoretical length of the seat is inserted in the seat and displaced along it and the clearance, with respect to the length of the seat, is detected as a consequence of the displacements. The apparatus includes an element adapted to be inserted in the seat, a position transducer coupled to the element and movable arms adapted to displace the element along the seat from a first position in which one of its ends is in correspondence with an end of the seat to a second position in which the other end is in correspondence with the relevant end of the seat. The position transducer detects the amplitude of the displacement.

Abstract: An apparatus for measuring the length of curved segments including loading pairs of rollers with one roller of each pair being driven, positioning switches, positioning shaped reciprocally movable elements defining a hollow to house the segment to be measured and movable arms and feelers to measure the segment. The hollow has a shape corresponding to the theoretical shape of the segment. The movable elements are fitted with openings for at least one of the ends of the segment. The feelers are arranged in correspondence with the openings to cooperate with the relevant ends of the segment.

Abstract: A method and apparatus for the measurement of the distance between two points along a circular arc having an unknown radius in which there is a measuring signal generated responsive to the distance between the two points along a straight line passing through them and a measurement of the bending radius of the arc effected on the basis of the distance of a third point on the arc from a straight line joining a fourth and fifth point on the arc. The apparatus includes a support for the arc of the material being measured, a first measuring head for measuring the distance along a straight line between the ends of the arc, a second measuring head provided with at least three feelers with one of the feelers being mobile with regard to the other two, for detecting the arc bending and a processing and indicating unit connected with the first and second measuring heads to determine the longitudinal development.