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| Number | Title | Issue Date |
| 8168914 | Electric-discharge-machining power supply apparatus and electric discharge machining method In an electric discharge machining, in order to reduce damage of an object to be machined and an electrode and to achieve machining velocity enhancement and reduction of electrode wear amount by appropriately controlling a short-circuit current that flows when the e... | 05/01/2012 |
| 7947918 | Method and generator for electrical discharge machining The invention relates to a method and a generator for generating a time sequence of discharge pulses separated from each other by pulse pauses for electrical discharge machining. At least two pulse capacitors are discharged each in the form of a partial pulse into t... | 05/24/2011 |
| 7816620 | Method and generator for electrical discharge machining The invention relates to a method and generator for generating a time sequence of EDM pulses having a predefined ignition voltage for electrical discharge machining. An AC voltage is generated from a DC voltage, furnished by a bipolar current source. The AC voltage ... | 10/19/2010 |
| 7812277 | Method and generator for electrical discharge machining The invention relates to a method and a generator for generating a time sequence of discharge pulses for EDM machining wherein a pulse capacitor (22) for generating the discharge pulse is charged with a charging voltage (U_chrg) and then discharged into the s... | 10/12/2010 |
| 7365452 | Sensor device and output characteristic switching method of sensor device A pressure sensor device (1) includes a sensing element (2) for sending an analog signal according to pressure. The pressure sensor device (1) outputs the analog voltage to a microcomputer (20) through an input-output terminal (8).... | 04/29/2008 |
| 7268314 | Discharge-processing power source device A power supply device for electric discharge machining includes a switching circuit that supplies a discharge pulse current to an inter-electrode portion that is a portion between an electrode and a workpiece serving as another electrode arranged to be opposed to th... | 09/11/2007 |
| 7214900 | Electrical discharge machine power supply An electrical discharge machining apparatus includes a work electrode adapted to support a work immersed in a working fluid, a tool electrode located opposing the work electrode with a predetermined gap therebetween, a capacitor that is connected between the work el... | 05/08/2007 |
| 7175752 | Method and apparatus for electrochemical machining An electrochemical machining apparatus and method for machining a workpiece. The apparatus provides a pulse of electric power, which is conducted from the workpiece, to an electrolyte flowing through a gap, and then to an electrode. Material is eroded from the workp... | 02/13/2007 |
| 7148442 | Power supply device for electric discharge machining An electric-discharge-machining power supply device in which energy loss is hardly produced and a charge voltage of a capacitor is easily controlled. When a switching element SW1 is turned on, a capacitor C is charged via an inductor L. When the voltage Vc of... | 12/12/2006 |
| 7145096 | Electric discharge machine power supply An electric discharge machine has a main power supply and a sub-power supply connected in parallel across a gap formed by an electrode and a workpiece. A voltage is first applied to the gap from the sub-power supply, and then machining energy is supplied to the gap ... | 12/05/2006 |
| 7119300 | Method and apparatus of asynchronous electric discharge machine for wire cut An apparatus of asynchronous electric discharge machine for wire cut adopted for use in machine industries employs a first electric discharge machine unit and a second electric discharge machine unit to provide electric energy to a cutting wire to generate alternate... | 10/10/2006 |
| 7113884 | Positioning apparatus for an electrical discharge machine and a method therefor A positioning apparatus for an electrical discharge machine includes: a power supply 106 for applying a pulse voltage between an electrode 101 and a workpiece 102; a discharge detecting means 1108 for detecting the occurrence of electrica... | 09/26/2006 |
| 7109432 | Electric power unit for machining of wire electric discharge machine The electric power unit for machining of a wire electric discharge machine includes an electric discharge state discriminate or (1a) for discriminating a state of electric discharge generated between the electrodes and an impression voltage selecting m... | 09/19/2006 |
| 7058672 | Resonant protection kit for power supply A resonant protection kit for a power supply includes a circuit adapted to perform analysis, determinative, and counter functions. The circuit collects a divided voltage on a capacitor to calculate an effective voltage value and uses fundamental and non-fundamental ... | 06/06/2006 |
| 7045735 | Machining power supply for wire electrical discharge machine Machining electrical power supply device for wire electrical discharge machining. Includes an electrical discharge state distinguishing circuit (6) for distinguishing at least two inter-electrode states, including electrical shorting and normal electrical dis... | 05/16/2006 |
| 7039490 | Controller for wire electric discharge machine A controller for a wire electric discharge machine which can achieve stable machining with high surface accuracy without requiring adjustment of a gain or the like in wire-electrode feed control. A discharge gap detection unit detects a voltage between a wire electr... | 05/02/2006 |
| 7009370 | Pulse forming converter A scalable, interleaved pulse forming converter is disclosed having two Buck switching converter modules each contributing half to the total load of the circuit to produce a programmable current pulse. Synchronization pulses to the two modules are set 180 degrees ou... | 03/07/2006 |
| 6998563 | Carbon nanotube apparatus for surface discharge polishing A carbon nanotube apparatus for surface discharge polishing using a transistor discharge circuit includes a signal generator having a integrated circuit for generating square wave; a photo coupler for isolating a cathode of the apparatus and an anode for processing;... | 02/14/2006 |
| 6980879 | Controller for wire electric discharge machine A discharge pulse number generated between a wire electrode and a workpiece is counted every predetermined time. A ratio Px/Ps of this counted value Px to the reference pulse number Ps will be determined to control an amount of coolant in response to this ratio Px/P... | 12/27/2005 |
| 6958460 | Device for machining by electroerosion The device for machining by electroerosion comprises an electrode-tool (EO) and an electrode-workpiece (EP) constituting the opposite poles of a working gap (GA) and an electrical circuit with a double voltage source (UD) connected to a supply network (A) arranged s... | 10/25/2005 |
| 6956181 | Method for making a fastener In accordance with one embodiment, the present technique provides a method for making a threaded fastener. The method includes that act of forming a die-making tool having surface features that correspond to the desired crest and flank profiles of a thread of the th... | 10/18/2005 |
| 6940703 | Overvoltage protection circuit An overvoltage protection circuit for interposing between an input voltage and a supply voltage is described. The overvoltage protection circuit includes switch circuitry connected to and passing current between an input voltage node and a supply voltage node, the i... | 09/06/2005 |
| 6937027 | Hybrid type sensor for detecting high frequency partial discharge Disclosed herein is a hybrid type sensor for detecting high frequency partial discharge which can detect high frequency partial discharge at a high signal-to-noise ratio without being influenced by power noise and surrounding noise, and guarantee the safety of a tes... | 08/30/2005 |
| 6933457 | Method and apparatus for electrical discharge machining of a workpiece A method and apparatus for electrical discharge machining of a workpiece wherein an erosion pulse is applied on the tool electrode. During the time of the erosion pulse the voltage (Ue) set on the electrode is acquired, and the erosion pulse is interrupte... | 08/23/2005 |
| 6930273 | Power supply unit for wire electrical discharge machining and method of wire electrical discharge machining A power supply unit for wire electrical discharge machining using an ac high-frequency power supply for applying an ac high-frequency voltage between a wire electrode (1a) and a workpiece (2) includes a high-frequency oscillation and amplification circ... | 08/16/2005 |
| 6903297 | Wire electric-discharge machining method and device A wire electrical discharge machining apparatus for machining a workpiece (2) by supplying discharge energy to a gap between a wire electrode (1a) and the workpiece (2) by a working-electric-power source (16) having a dc power supp... | 06/07/2005 |
| 6844517 | Power supply device for electric discharge machine A power supplying device for an electric discharge machine prevents electric discharge by a voltage from a subsidiary power supply circuit during a delay time from generation of the electric discharge to a rise of a voltage from a main power supply circuit. A parall... | 01/18/2005 |
| 6756557 | Power supply for wire electric discharge machining In a power source apparatus for wire electric discharge machining capable of applying voltages of both of positive and opposite polarities to a gap between a wire electrode (1a) and a workpiece (2), there is provided a controller (14) for... | 06/29/2004 |
| 6727455 | Power supply system for applying a voltage of both positive and negative polarities in electric discharge machining In an electric discharge machining power supply system that can apply a voltage of both positive and negative polarities between an electrode and a workpiece, there is provided a controller that applies a first voltage pulse between the electrodes for a predetermine... | 04/27/2004 |
| 6630641 | Electric discharge machining apparatus generating preliminary discharge and machining discharge pulses An electric discharge machining apparatus includes a wire electrode for machining a workpiece, and a first voltage applying unit for applying a voltage pulse. The voltage pulse has a rise time longer than a discharge formative time lag when a rectangular ... | 10/07/2003 |
| 6600125 | Process parameter optimization in electrical discharge machining A method and apparatus for electrical discharge or electrochemical machining of workpieces, in which a machining electrode is moved relative to a workpiece, the machining is performed in cycles, and the appropriate process parameters are adjusted for mach... | 07/29/2003 |
| 6580048 | Electrical discharge machining apparatus supplying initial and processing currents Charge accumulated in a capacitor is used to provide a processing current flow between a target and an electrode. When a diode is turned on, a first dc power supply is used to provide the processing current flow between the target and the electrode. In th... | 06/17/2003 |
| 6469522 | Electrical discharge state detecting device for electrical discharge machining machine An electrical discharge state detecting device for an electrical discharge machining machine which detects an electrical discharge state during an electrical discharge machining operation. The detecting device includes a high-pass filter for detecting a h... | 10/22/2002 |
| 6465754 | Process and device for machining by electroerosion The process and device for machining by electroerosion are arranged so as to produce during each erosive discharge the following succession of phases: a delay phase (tD) during which an alternating voltage is applied between the tool and the pi... | 10/15/2002 |
| 6452416 | Abnormality detecting apparatus for a rotating electric machine An abnormality detecting apparatus in which noise is rejected in determining the condition of each of rotating electrical machines, so that a partial discharge of a rotating electric machine is detected with high accuracy. The abnormality detecting appara... | 09/17/2002 |
| 6429396 | Electric discharge processing power supply having a protection network for the switching element A power supply for an electric discharge machine which provides electrical power intermittently for discharge machining in a machining gap formed between an electrode and a work piece. The power supply comprises a direct current power source, a switching ... | 08/06/2002 |
| 6423920 | Electric discharge machining power supply, and electric discharge machining method A power supply (100) and a method for electric discharge machining by repeatedly providing a current pulse to a working gap (3) formed between a tool electrode (1) and a workpiece (2) includes a d.c. power source (E), first switching elements (Tr1-Trn) co... | 07/23/2002 |
| 6392183 | Process and device for machining by electroerosion In the process of machining by electroerosion, there is adjusted during a first transitory phase the machining current increase of the discharges after triggering a discharge between the electrode and the piece, such that a parameter connected to this inc... | 05/21/2002 |
| 6359448 | Electrical discharge state detecting device for electrical discharge machining machine An electrical discharge state detecting device for an electrical discharge machining machine which detects an electrical discharge state during an electrical discharge machining operation. The detecting device includes a high-pass filter for detecting a h... | 03/19/2002 |
| 6259053 | Method and apparatus for controlling the position and power of electrodes in an electric-discharge texturing machine A method and apparatus for controlling the position and power of electrodes in an electric-discharge texturing (EDT) machine for texturing a roll includes an actuator for moving an electrode away from and towards a roll to be textured to maintain a desire... | 07/10/2001 |
