Abstract: A device for keeping the annular outlet mouth of the gas volute always centered about the nozzle assembly in a gas turbine, consisting of two diametrically divided retaining rings embracing said annular mouth, the lower half-ring having an inner radius greater than that of the upper half-ring, this latter forming predetermined radial gap with said annular mouth.

Abstract: A bladed loom reed comprising a support base onto which are placed a series of preassembled packs of blades. Each preassembled pack has blades fixed to an auxiliary support and the bladed loom reed is formed by combining the packs on a support base with or without intermediate spacers between packs.

Abstract: A main lever for a high-speed rotary dobby having two opposing sidepieces in which two corresponding opposing frusto-conically flared holes are formed in each side piece by pressing or milling for a removable main pin for coupling the lever to the dobby crank arm. Two inner annular recesses concentric with the holes are also formed for housing a bearing of increased axial length. The sidepieces are joined together without welding by a special annular spacer hub acting as the fulcrum for the lever and, at the free end of the curved guide for the slider which adjusts the travel of the heddle frames, by a spacing and vibration-damping block. The slider passes between the two sidepieces in the curved guide zone and is locked in position by a special locking device. Lever modifications and special reinforcements are also provided.

Abstract: A system for safe vapor recovery, particularly for fuel filling installations, in which a positive displacement pump effects controlled drawing of a vapor-air mixture into a vapor return pipe which extends to the bottom of the underground tank of the installation. The system is provided with a non-return valve downstream of the pump and a special circuit for effecting the controlled in-drawing based on the quantity of fuel delivered, the difference in temperature between the underground tank and the recovered mixture, and especially on the density of the mixture, by which its degree of explosiveness is determined. Structure are also provided for preventing or limiting explosion propagation.

Abstract: A volumetric meter for liquids and/or gases, in the radial cavities of the rotor of which there are housed rolling rollers which, by undergoing mutual repulsion by the action of magnets embedded in them, are urged radially into a sealed state against the inner surface of the cylindrical chamber, which is provided in positions straddling said opposite maximum and minimum clearance zones with two portions having constant curvatures with their centre on the rotor axis and extending through an angle equal to the angular pitch between two successive rollers, i.e. to 360.degree. divided by the number of rollers used. Further inlet and outlet ports cooperating with the rear space in the housing cavities are also provided, as are fine adjustment means.

Abstract: A weft inserter rapier for shuttleless weaving looms in which the weft clamping and retaining system comprises an elastic clamping foot the cross-section of which has a reverse-"U"-shape which is urged, due to the action of a spring-loaded lever, against two metal blades resting on two supports made from an elastomeric material. The metal blades may be provided with an upwards-protruding step at their adjacent ends inside said clamping foot, and the clamping foot can be linked by a semispherical articulated joint to a spring-loaded lever.

Abstract: A method for forming a roller bearing of very small axial dimension and high load-carrying capacity, and applicable also to a large-diameter roller bearing, comprising inserting the rollers into the circumferential guide and rolling track of the outer race and holding the rollers in position by two opposing lateral shoulder-forming spring rings of small thickness which are snap-inserted into corresponding inwardly flared grooves provided in the opposing faces of the bearing outer race. The rings being locked in position by using suitable dies to axially press annular appendices which define the mouth of the annular grooves. Modifications to this method are provided, and the roller bearings obtained in accordance with the invention are described.

Abstract: A system for the rapid balancing of revolving shafts, in particular, the revolving shaft of a gas turbine. The system comprises two mutually adjacent bores provided in the stator of the turbine, which can be closed by relevant plugs, and which are collimated on the screw-threaded bores of the rotor. The system also comprises a special rigid rod for elastically holding a screw-threaded balancing mass, and for causing it to rotate.

Abstract: A warp yarn tensioning device for a loom, in which the warp yarns are wound about a compensator roller through an arc of approximately 180.degree.. The roller is movable against the action of counteracting springs either by rotation or by translation in the direction of the thus wound substantially parallel warp yarns and is supported about an axis by bearings. The device operates in feeding the shed with yarns from the warp beam and in maintaining a constant yarn tension during loom operation. This is accomplished by supporting the compensator roll to undergo only a small amount of swing or translational movement in order to follow the warp yarn tension variations.

Abstract: A method for continuously and automatically monitoring the electrical operability and control reliability in a liquid crystal display unit and comprising, inter alia, determining the discharge or charge time of a capacitor comprised of a segment and the backplate or return electrode of the display unit when a voltage waveform fed to the segment has been disconnected, said time being determined by a binary counter which commences at the moment of disconnection of the feed waveform and stops when the capacitive discharge or charge waveform differs in binary state from the value of the segment feed wave.

Abstract: A demountable pin for rotatably connecting together two elements of small axial dimension, consisting of a bolt with a frusto-conical under-head and an inner hexagonal through bore for tightening it by a key. The pin is locked between two frusto-conical flares of the elements by an end nut with a frusto-conical under-head and a washer with a frusto-conical surface of greater taper than the flares. The under-heads of the nut and the bolt cooperate with the flares.

Abstract: An operating system for the flexible gripper tapes in shuttleless looms in which the backing plate that limits upward motion of the tape is located in the region where the unwound tape is not engaged by the drive wheel, and which plate is provided with suitably disposed holes fed with compress air. The compressed air guides the tape and helps prevent undesirable buckling.

Abstract: A system for disengageably coupling a rotor body to the shaft of rotary machines, in particular gas turbines and rotary dobbies, in which the coupling surface of said shaft is a cylindrical surface provided all the way round with longitudinal sharp-edged grooves of very small depth, they being uniformly distributed equidistantly to form a grooved cylindrical stub the interior of which comprises a frusto-conical bore cooperating with corresponding frusto-conical plug rigid with one end of a pull rod to lock the cylindrical coupling surface of the shaft against the cylindrical coupling surface of said rotor body by radial interference.

Abstract: A modulator for controlling high-speed rotary dobbies of the type which control the dobby main shaft's motion by transmitting power from a drive shaft through pivotable rocker supports rotatably driven by the drive shaft and engaging conjugate cams so that the drive shaft's uniform rotary motion is converted into non-uniform motion of the dobby main shaft. This is caused by the conjugate cams, which cause the rocker supports to pivot. The rocker supports are mounted so as to accommodate this rocking. The two rocker supports are connected to the dobby main shaft by two connecting rods hinged by pins on one of the rocker supports and on an appendix of the main shaft respectively, these connecting rods being disposed antisymmetrically to each other in accordance with a particular geometry.

Abstract: A system for instantaneously detecting breakage of a weft yarn within the shed of a multiphase loom comprising a series of closed-loop induction coils which extend in succession along the entire weaving zone to cooperate with the rotating shuttle weft yarn packages, which are provided with at least one off-centered magnetic element.

Abstract: A gripper transportation system for a shuttleless loom, in which in the guide for the flexible tape, in a position in close proximity to the control sprocket, there is provided a transverse slot through which a solid stick of porous synthetic material impregnated with lubricating grease and/or oil passes and is urged against said tape by a spring of adjustable tension.

Abstract: A regulating system for regulating a double-shaft gas turbine, wherein simultaneously: the fuel feed electrovalve is governed by a signal proportional to the difference between the number of revolutions per minute of the power turbine and a reference value; the movable nozzles of the power turbine are governed by a signal either proportional to the difference between the number of revolutions per minute of the compressor and a reference value, or proportional to the difference between the temperature of the exhaust gases and a relevant reference value; and the movable stator-blades of the compressor are governed by a signal proportional to the ratio between the revolutions per minute of the compressor to the square root of the ratio of the absolute ambient temperature to an absolute reference or design temperature.

Abstract: A self-locking demountable pin consisting of a central stay bolt with an internal hexagonal through bore for its tightening by a key and comprising at its two ends two opposite-handed external threads, right handed and left handed respectively, which cooperate with the corresponding threads of two elastic end nuts each provided with an annular flange having a frusto-conical surface and decreasing in thickness in an outward direction, its taper being greater than that of two frusto-conical flares into which the nuts are to be inserted.

Abstract: Hydraulic-exchange pumping device comprising two containers or tanks, inside each of which there are defined: a chamber for the product to be pumped, which is respectively connected, through a delivery valve and a suction valve, to the lines of delivery and of intake of the product to be pumped, as well as a chamber for the hydraulic drive fluid, which is connected to a pump through a four-way, three-position distribution box. This partitioning is accomplished by means of an internal elastic membrane having a decreasing thickness from the its peripheral edge towards its central zone, which can be also equipped with a strengthening cloth embedded inside it, as well as with a set of metal rings having a cross-section surface area decreasing towards the center of the same membrane.

Abstract: System for regulating temperature of hot water in a wall-hung instantaneous mixed gas heating unit, in which the value of the temperature detected by a sensor inserted on the output of the secondary circuit of the hot water exchanger is compared with a set value, and their difference or error value is sent to the input of an amplifier of proportional-integrational-derivative type (P.I.D.), whose output is connected to one input of a selector of minimum value or power, to the other input of which is sent the difference or error value between the temperature of the heating system water and the corresponding maximum tolerable set temperature. The output of the selector then commands the gas modulating valves through a power amplifier, as well as the gas on/off operating valve through comparison with a signal proportional to the minimum thermal power that can be supplied by the heating unit.