Abstract: Device and method to measure the gap between substantially static elements with a variable reciprocal position, used to adjust the reciprocal position of said elements to obtain a desired transit gap, comprising visual recording means connected to a processor equipped with at least display means, said processor being suitable to receive the images filmed by said visual recording means and to automatically compare said images with at least a pre-selected sample mask substantially reproducing the desired gap to be obtained, said processor being suitable to display, in numerical form on appropriate interface windows, the dimensional discrepancies between the image relating to the actual transit gap defined by said elements as filmed by said means, and said pre-selected sample mask.

Abstract: Method to measure the variations in section of a hot rolled bar (12) as it is fed, the method including the generation of a variable frequency magnetic field by at least a generator device (14) defining an inner space (214) for the transit of the bar (12), the variations in section of the bar (12) in transit being measured by a receiver device (15) suitable to monitor the perturbations induced on the magnetic field by the variations in the area of section of the bar (12) in transit. The receiver device (15) is arranged coaxial and inside the generator device (14) and defines inside the same a surface for the transit of the bar. The (12) has a transverse section of (A.sub.S "), and the value ("f.sub.0 ") of the frequency of the magnetic field generated by the generator device (14) is suitable to minimize the influence of the real temperature of the bar (12) on the measurement.

Abstract: Controlled current feed device for electric arc furnace employed to melt metals, wherein the feed line comprises at least a medium tension bar (13), a feed control device and a transformer (17) serving the furnace, the feed control device (16) being arranged between the medium tension bar (13) and the transformer of the furnace (17) and comprising a mutual inductor (19) consisting of a primary coil (19a) and a secondary (19b) coil, the primary coil (19a) being arranged in serial connection on the feed line (10) and the secondary coil (19b) being connected to at least a re-phasing filter (20) comprising at least a condenser (22).

Abstract: Selection and control device to count bars being fed separated orthogonally to their axis on a plane and cooperating with a translating device such as a screw-type translator, the device including two optical monitors and a processing unit, the optical monitors being arranged at an angle with their apex substantially on the plane on which the bars are fed and whose respective monitoring axes cooperates with a portion of the plane on which the bar being fed passes. The respective monitoring axes have an angle of incidence with respect to the plane on which the bars are fed in the proximity of a common point cooperating substantially with the positioning seating of the bars on the translating device, each of the monitors lying on a plane substantially orthogonal to the plane on which the bars are fed, and to the axis of the bars, and including respective angles (".alpha.",".beta.") with respect to a line vertical to the plane of feed, the angles (".alpha.", ".beta.") defining an angle (".gamma.

Abstract: A method to control the drawing of rolled stock in a segment of the rolling line includes measuring the section of the rolled stock passing through is made by a first detector located at the outlet of the semi-finishing block and by a second detector located at the inlet to the finishing block. The method also carries out at least a measurement of the section of the rolled stock with a third detector located at the outlet of the finishing block, the drawing action being controlled and regulated by a control unit by comparing the measurements of the section at the outlet of the semi-finishing block, at the inlet to the finishing block and at the outlet thereof with the corresponding values memorized in tables in the control unit.

Abstract: Method to control the power supply for electric arc furnaces, whether they be fed with AC or DC, the furnaces including a melting cycle which includes the loading of the scrap carried out at time T.sub.0, an initial step of pre-melting the scrap with low and average power with a duration of (T.sub.1 -T.sub.0), a step of melting at maximum power with a duration of (T.sub.2 -T.sub.1) and a refining step with a duration of (T.sub.3 -T.sub.2), the method including the dynamic identification of the approximate moment when situations of risk inside the furnace cease, with a consequent permission to start delivery of maximum power, the dynamic identification being governed by the control and analysis of the electrical quantities, tension and current, fed to the furnace.