Abstract: An apparatus for converting rotary motion developed by a power source, such as an alternating current motor, into linear motion for use in accelerating a carriage in a reciprocal manner in a work treatment area of a cut-off machine. The apparatus includes a power train for transferring the power from the power source to a rack attached to the carriage. The power train includes a drive unit having a drive pulley, an idler pulley and an endless drive belt disposed about the pulleys. The drive belt engages the rack wherein activation of the power source results in motion of the rack which correspondingly moves the carriage.

Abstract: A cut-off die set of the double cut type in which sections of tubing are successively severed from a length of tubing utilizing a notching cut followed by a severing cut. A notching blade is mounted to a notching blade holder slidably disposed on an adjustable mounting block. The notching blade holder includes a cam follower mounted thereon. The die set further includes a clamping apparatus having reciprocal clamping jaws operative to move between a clamped position and a released position whereby operation of the clamping jaws and the notching blade are controlled through a single cam mounted to an upper platen of the die set.

Abstract: An apparatus for mounting a shearing blade specifically for use in a cut-off die set of the type used to cut tubing continuously emanating from a mill. The present invention is directed toward the shearing blade assembly used in conjunction with the notching blade of the cut-off die set. The subject device includes a mounting block fixed to the upper platen of the die set, a shearing blade mounted in a shearing blade cartridge, and a locking stud rotatably mounted on the mounting block which threadably engages and secures the shearing blade cartridge to the mounting block.

Abstract: An apparatus and method for severing a workpiece wherein the workpiece is clamped at two axially spaced apart locations, and heated to reduce the tensile strength of the material, after which the axial spacing between the clamps is increased to pull the workpiece apart in the heated area. This apparatus and method may also be used in a flying environment; i.e., the severing apparatus travels with the workpiece to sever sections of a workpiece continuously emanating from a fabrication mill.

Abstract: A cut-off die set of the double cut type, in which sections of tubing are successively severed from a length of tubing, utilizing a notching cut followed by a severing cut. A rack and pinion assembly is used to transform the vertical reciprocating motion of the upper and lower platen into the horizintal reciprocating motion used for the notching stroke. The rack and pinion assembly comprises a rack mounted to the upper platen and a gear sector mounted to the lower platen, the gear sector includes a drive roller which engages a cam track on the cross slide. As the upper platen and lower platen are vertically reciprocated, the rack member causes the gear sector to rotate, sliding the drive roller through an arcuate path. Movement of the drive roller through the arcuate path causes the cross slide to move in a reciprocating manner in relation to the reciprocating motion of the upper and lower platens.

Abstract: A die cart adapted to be used for the removal and installation of a cut-off die set from the carriage of a cut-off press. Whereby a slide member operating on a set of guide rails mounted to an independent frame and driven by a drive screw assembly is coupled to the die set. The drive screw assembly is then rotated to pull the die set off the carriage of the cut-off press onto the die cart and the die cart is then removed. Further, the guide rails are pivotal about a point on the frame to enable the die cart to install and remove cut-off die sets secured from the inclined carriage of a cut-off press.

Abstract: A clamping apparatus allowing an operator to securely position and clamp a cut-off die set to the carriage of a cut-off press. The clamping arrangement includes outwardly beveled sides on the die set coacting with an inwardly beveled stop and an inwardly beveled eccentric clamping member. The clamping member being rotatable to allow the die set to be placed in the proper position on the carriage. After positioning the die set on the carriage, the eccentric clamping members are rotated to contact the outwardly beveled edge of the platen thereby wedging the platen between the stop and the eccentric clamping members.

Abstract: A ram-driven cut-off die set of the double-cut type in which sections of tubing are successively severed from a continuous length of tubing by a notching cut followed by a severing cut wherein improved means are provided for mounting and guiding the notching blade in its notching movement. The improved mounting means comprises an upper shaft positioned over the tube path and extending from one side to the other side of the path, a lower guide shaft positioned totally on the one side of the tube path, and a cross slide having a relatively long upper portion slidably journalled on the upper shaft and a relatively short lower portion journalled on the lower guide shaft to maximize the magnitude of the journalling support provided to the notching blade as it makes its reciprocal movement across the tube path to accomplish the notching cut.

Abstract: Apparatus for mounting a notching blade assembly specifically for use in a double-cut die set of the type used to cut tubing continuously emanating from the tube mill. The present invention is directed toward the notching blade assembly used in conjunction with the vertical guillotine blade of the cut-off die set to notch the upper surface of the tubing prior to the shearing cut. The subject device includes a clamp plate secured to the carriage of the double-cut die set, a key-shaped transverse bore extending through the clamp plate and carriage body so that the notching blade having a corresponding key-shaped bore can be placed betwen the clamp plate and carriage, a locking stud having a locking pin on one end thereof is inserted through the key-shaped transverse bore and rotated away from the channel groove portion of the keyhole-shaped bore to clamp the notching blade between the clamp plate and carriage assembly.

Abstract: A shearing blade assembly specifically for use in a double cut die set of the type used to cut tubing continuously emanating from a tube mill. The present invention is directed toward the shearing blade assembly used in conjunction with the notching blade of the cut-off die set. The subject device includes a mounting block fixed to the upper platen of a die set, a shearing blade mounted to a shearing blade cartridge. The shearing blade cartridge is then inserted into the mounting block and is retained in position by a cam lock assembly. The cam lock assembly and cartridge system allows the shearing blade to be quickly and efficiently removed and replaced as needed.

Abstract: A microwave horn having a narrow radiation beam characteristic is energized by a Gunn oscillator coupled to a driver/detector that turns the Gunn oscillator on for a small fraction of a period to produce a sequence of detected pulses representative of an item being sensed that is amplified by an A.C. amplifier and filtered with gain controlled by a sensitivity potentiometer that energizes a threshold detector to produce threshold pulses that trigger hold-off circuitry to produce an output pulse when the threshold pulse is outside the duration of the output pulse. A hold-off potentiometer controls the duration of each output pulse. An output driver amplifies the output pulse and delivers it to an output terminal.

Abstract: A cut-off machine especially suitable for handling tubing and including a machine frame defining a work treatment area, a ram on the frame adjacent the work treatment area mounted for movement through a power stroke by at least two drive members engaging the ram at spaced points, a motor system mounted on the frame, and a drive system interconnecting the motor system and the drive members on the ram. The drive system comprises a pair of flywheels driven by the motor system, a pair of crank shafts driven by the flywheels through a clutch associated with each flywheel, and a crank portion on each crank shaft journalled in the ram so that the ram is moved through an orbital path in response to rotation of the crank shafts. A gear train is positioned between the crank shafts to synchronize the rotation of the crank shafts to ensure that the ram moves in a translatory manner through its orbital path.

Abstract: A notching blade assembly specifically for use in a double-cut die set of the type used to cut tubing continuously emanating from the tube mill. The present invention is directed toward the notching blade assembly used in conjunction with the vertical guillotine blade of the cut-off die set to notch the upper surface of the tubing prior to the shearing cut.The subject device includes a guide member mounted to a cross slide assembly affixed to a double cut die set, having a notching blade holder displaceably mounted to the guide member allowing the holder to be positioned at any point along the guide member. The invention further includes an adjustment screw mounted in a base and threadedly; coupled to the notching blade holder, whereby rotation of the adjustment screw can be used to vary the position of the notching blade holder on said guideway.

Abstract: A shearing blade assembly specifically for use in a double cut die set of the type used to cut tubing continuously emanating from a tube mill. The present invention is directed toward the shearing blade assembly used in conjunction with the notching blade of the cut-off die set. The subject device includes a mounting block fixed to the upper platen of a die set, a shearing blade mounted to a shearing blade cartridge. The shearing blade cartridge is then inserted into the mounting block and is retained in position by a cam lock assembly. The cam lock assembly and cartridge system allows the shearing blade to be quickly and efficiently removed and replaced as needed.

Abstract: A ram-driven cut-off die set of the double-cut type in which sections of tubing are successively severed from a continous length of tubing by a notching cut followed by a severing cut wherein improved means are provided for mounting and guiding the notching blade in its notching movement. The improved mounting means comprises an upper shaft positioned over the tube path and extending from one side to the other side of the path, a lower guide shaft positioned totally on the one side of the tube path, and a cross slide having a relatively long upper portion slidably journalled on the upper shaft and a relatively short lower portion journalled on the lower guide shaft to maximize the magnitude of the journalling support provided to the notching blade as it makes its reciprocal movement across the tube path to accomplish the notching cut.

Abstract: A switching circuit comprising a substrate of semiconductor material, a first switching device (e.g., a diode) formed in a first region of the substrate, a second switching device (e.g., a diode) formed in a second region of the substrate integral with the first region, the second switching device being electrically coupled to the first switching device, and means, disposed in the substrate, for electrically isolating the first substrate region from the second substrate region.

Abstract: A method for dimple free guillotine cutting of multiple wall tube which involves first cutting a transverse notch substantially completely through the outermost tube wall and secondly cutting a notch through the path of the first notch but of greater depth to extend partially through the innermost tube wall. The cutoff function is then finalized by means of a guillotine blade which enters through the coextensive notches. Both pull-across and thrust blades for carrying out the method are disclosed.

Abstract: A voltage controlled oscillator includes a VCO chip that is a monolithic circuit with a Gunn diode and varactor diode intercoupled by a resonant circuit. A detector/discriminator/power divider chip is coupled to the VCO chip through a directional coupler and is a monolithic circuit having a pair of discriminator diodes and amplitude detector diode on a semi-insulating substrate with associated circuit components. Connected-together electrodes of the discriminator diodes are connected to one output of the power divider. An electrode of the amplitude detector diode is connected to the other output of the power divider. Stagger-tuned resonant circuits are coupled to the other electrodes of the discriminator diodes. Conducting portions forming low pass filters couple the amplitude detector diode and the discriminator detector diodes to respective outputs.

Abstract: A ram-driven cut-off die set of the double-cut type in which sections of tubing are successively severed from a continuous length of tubing by a notching cut followed by a severing cut wherein improved means are provided for mounting and guiding the notching blade in its notching movement. The improved mounting means comprises an upper shaft positioned over the tube path and extending from one side to the other side of the path, a lower guide shaft positioned totally on the one side of the tube path, and a cross slide having a relatively long upper portion slidably journalled on the upper shaft and a relatively short lower portion journalled on the lower guide shaft to maximize the magnitude of the journalling support provided to the notching blade as it makes its reciprocal movement across the tube path to accomplish the notching cut.

Abstract: Method of manufacturing silicon mesa diodes from a wafer of silicon. The surface of the wafer is coated with a first layer of silicon nitride and a second layer of silicon oxide. By masking and etching procedures, silicon nitride is left only on the portions of the surface defining the mesas to be formed. The wafer is etched to form the mesas and then treated to form a passivating silicon oxide coating at all the exposed surfaces of the wafer. The silicon nitride is removed from the upper surfaces of the mesas and metal contacts are applied to these upper surfaces. The wafer is subsequently divided into discrete dice, each containing a mesa, and the dice are mounted in suitable enclosures.