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Lawrence Welk, the bandleader who entertained millions of Americans over a generation of broadcasting his TV show, once received a patent: for a music-themed design of an ashtray.
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| Number | Title | Issue Date |
| 8178816 | Power supply for resistance welding units A device for resistance welding includes a welding clamp housing, a welding transformer, a welding clamp, a welding clamp drive for operating the welding clamp and a power supply using alternating supply voltage. The device may be built as small as possible and may ... | 05/15/2012 |
| 7388171 | Power supply apparatus for welder Welding conditions are set for a power supply apparatus for use with a welding machine, using a control panel unit (96). A memory (105) stores therein welding conditions as set through the control unit (96), and holds the set welding conditions ... | 06/17/2008 |
| 7347120 | Robot of SCARA type A SCARA robot has a robot console, a first robot arm articulated on the robot console and swivelable about a first swivel axis, a second swivel arm articulated on the first swivel arm and swivelable around the second swivel axis extending substantially parallel to t... | 03/25/2008 |
| 7274223 | Semiconductor device As devices are often different in the characteristics from one another, semiconductor chips based on the devices have discrepancies in the performance. A semiconductor device having a semiconductor switching element and a drive controlling means (1) for gener... | 09/25/2007 |
| 7253540 | Method for operating a parallel arrangement of semiconductor power switches The invention relates to a method for statically balancing the loading of power semiconductor switches (S1, S2, S3) in a parallel circuit (1). To achieve this in prior art, switching instants of individual switches (S1 | 08/07/2007 |
| 7247810 | Module for resistance welding tongs The invention originates in the field of resistance welding technology, among other means by means of welding robots 1, for use in roll seam welding, projection welding or spot welding, and has to do with accommodating components for operation inside the hous... | 07/24/2007 |
| 7145097 | Method and apparatus for electrical resistance spot welding using electrical servo actuator The present invention provides a servo driven spot welder where an electric servo actuator moves at least one of two electrodes to and away from the workpiece. The servo driven spot welder includes a controller that allows accurate control of the position of one of ... | 12/05/2006 |
| 6881920 | Welding parameters setting method for a resistance welder controll apparatus A robot controller and a welding timer coupled to each other by a dual-port RAM which is connected to data busses thereof, and Initial reference values of welding parameters are stored into a ROM of welding timer in same sequence as character strings of items. When ... | 04/19/2005 |
| 6570120 | Apparatus for resistance welding Apparatus for resistance welding with different welding currents has a welding transformer having a primary and a secondary side. Two welding electrodes are connected at the secondary side to the welding transformer and are each arranged on a respective c... | 05/27/2003 |
| 6429398 | Flash welding installation The invention relates to an installation for welding metal bands comprising two retaining members (2, 2') for the ends of both bands, mounted respectively on a fixed frame (1) and a mobile frame (1'), means for shearing both facing parallel edges (m1, m2)... | 08/06/2002 |
| 6337458 | Method for automatically selecting the welding sequence for manual welding electrode holders; manual welding electrode holder for implementing the method The electrode holder comprises a body 1 suspended by an articulated link 9, 13, 14 from a sling 6, this articulated link comprising a pivot collar 13 in which the body can rotate around a principal longitudinal, swiveling axis X and a pivot 14 mounted on ... | 01/08/2002 |
| 6303894 | Resistance welding with an electrochemical capacitor as the current power source A resistance type pulse welding apparatus for workpieces, including a handpiece, a pair of electrodes mounted at the tip of the handpiece adapted for delivering weld current pulses to a workpiece to be welded, an electrochemical capacitor providing a high... | 10/16/2001 |
| 6215086 | Resistance welding controller A resistance welding controller for supplying a substantially constant level of AC current to a resistance welder is provided. In one embodiment, the resistance welding controller automatically switches modes to provide compatibility with both AC and DC r... | 04/10/2001 |
| 6137077 | Inverter resistance welding control apparatus When a second switching element Q2 is changed over from ON state to OFF state for each switching cycle while a first switching element Q1 remains ON in a unit weld period Ta for example, a primary current I1 doe... | 10/24/2000 |
| 6054668 | Method and apparatus of projection welding A process and apparatus for projection welding of overlapping nonferrous sheets, particularly thin aluminum sheets. One of the sheets is provided with a projection therein, and the sheets are positioned so that the tip of the projection contacts a surface... | 04/25/2000 |
| 6043448 | Method of welding cylindrical bodies A method for welding using an on/off switching control. The switching control forms a wave cycle with a plurality of peaks. Within a half wave cycle (1/2f) of welding current f, the wave form takes the shape of an inclined straight line A rising to a pred... | 03/28/2000 |
| 5945011 | Control apparatus for welding robot and method of teaching welding robot A control apparatus for a welding robot has a welding gun which is provided at a front end of a robot arm to be driven by plural kinds of servomotors. An amplifier circuit board is provided so as to mount thereon appropriate inverters by selecting out of ... | 08/31/1999 |
| 5821491 | Multiple single phase weld control systems coupled to a polyphase power source A weld control system, supplied by a polyphase voltage source, consists of an isolation contactor supplying power to separate single phase weld controllers. The single phase weld control systems have their separate power modules combined into a single pow... | 10/13/1998 |
| 5760361 | Multiple single phase weld control systems from a polyphase power source A weld control system, supplied by a polyphase voltage source, consists of multiple and separate single phase weld controllers. The single phase weld control systems have their separate power modules combined into a single power module assembly for more e... | 06/02/1998 |
| 5714733 | Controller and programming unit for resistance welding and laser beam processing To provide a resistance welding and laser beam processing controller which greatly facilitates the work of inputting (setting) welding or processing conditions for a number of schedules. Using a programming unit 10, an operator calls a schedule screen on ... | 02/03/1998 |
| 5683598 | Terminal unit for resistance welding or laser beam processing, control apparatus for resistance welding or laser beam processing, and method for operating terminal unit A single terminal unit is provided to automatically adapt to various types of control apparatus for controlling resistance welding or laser beam processing by merely connecting the terminal unit to the control apparatus via a communication interface. In a... | 11/04/1997 |
| 5667704 | Multiple sequence welding controller A three-phase multiple sequence welding controller includes a single unit controller having three distinct welding sequence control modules and three distinct machine logic control modules integrated into a single unit. The single unit controller preferab... | 09/16/1997 |
| 5560842 | Spot welding apparatus and its power supplying method A spot welder apparatus includes: a single welding power source (5); a welding current distributor (7) connected to the single welding power source; and a plurality of spot welders (1A, 1B, 1C) connected to the welding current distributor. Each of a plura... | 10/01/1996 |
| 5449876 | Multi-point spot welding machine controller A multi-point spot welding controller includes a central processing unit, a memory means, a monitoring interface device, a system bus, an input device, a first display device, a second display device, an output interface device, a switch output interface ... | 09/12/1995 |
| 5416288 | Multiple spot resistance welding machine for welding wire grids A multiple spot resistance welding machine for the welding of wire grids by direct current comprises several contact electrodes (4.1.1, 4.2.1, 4.1.2, 4.2.2, . . . ) contacting a respectively associated grid point from both sides. The switching arrangement... | 05/16/1995 |
| 5298712 | Welding system for a battery pack A welding system for a battery pack utilizing three-phase 400 Hz power at low voltage over a short time period. In utilizing these parameters, there is minimal or no migration of materials between a welding area, welding electrodes, a metal member and a b... | 03/29/1994 |
| 5276296 | Welding gun apparatus In a DC type C-shaped welding gun apparatus having a transformer mounted thereon, a center tap of the transformer is communicated to a movable gun arm via an ounce metal plate. A rear end portion of a stationary gun arm is pressingly held between a pair o... | 01/04/1994 |
| 5237147 | Electronic device for controlling and monitoring the electrical power supply to resistance welding equipment in particular as used in the manufacture of cans An electronic device for controlling and monitoring the electric power supply to welding equipment includes an inverter driven by a rectifier that supplies voltage to the primary winding of a welding transformer. A secondary winding of the welding transfo... | 08/17/1993 |
| 5171960 | Direct-current resistance welding apparatus and method of controlling welding current thereof A direct-current resistance welding apparatus includes pneumatic actuators for pressurizing welding guns, respectively, to grip respective workpieces, an inverter composed of a plurality of parallel-connected switching device units each comprising a pair ... | 12/15/1992 |
| 5120924 | Welding method for coated metal articles A method for spot welding metal articles having coatings on the surfaces thereof in which the coating on the outer surface of one of the articles is removed by heating the article as a resistance in an electric circuit. This is done using low amperage cur... | 06/09/1992 |
| 5077458 | Resistance welding apparatus with gun-arm mounted transformer A resistance welding apparatus mounted on a robot arm includes a transformer having primary and secondary windings. Two gun arms supporting respective welding electrodes in confronting relation to each other are relatively movable toward and away from eac... | 12/31/1991 |
| 5072090 | Inverter type resistance welding machine There is described an inverter type resistance welding machine comprising one rectifier, one inverter connected in series to the rectifier, and a plurality of welding current elements connected in series between a plurality of welding transformers and an ... | 12/10/1991 |
| 5053599 | Welding gun assembly with transformers A welding gun assembly includes a welding gun with a pair of electrodes for welding workpieces together therebetween. The welding gun assembly includes an array of transformers extending in one direction and having respective secondary coils. The welding ... | 10/01/1991 |
| 5023423 | Transformer apparatus with rectifiers A transformer apparatus for use with a welding gun includes four transformer/rectifier assemblies each including a transformer having a secondary winding and a rectifier, a terminal plate connected to the secondary winding through the rectifier, and a cen... | 06/11/1991 |
| 4973814 | Controller for resistance welding machine An inverter-type resistance welding machine includes a keyboard for inputting desired welding current command data corresponding to commanded values, a display unit for displaying, in the form of a numerical table or graph, the welding current command pat... | 11/27/1990 |
| 4965860 | Capacitor type welding power unit A capacitor type welding power unit incorporates a constant-current charging control circuit which serves to control a charging current being supplied to a capacitor so as to be substantially constant during the charging. By such a control circuit, which ... | 10/23/1990 |
| 4943904 | D.C. power unit assembly including unitized single-phase D.C. power units The specification discloses a physically compact, low-inductance, high power-factor D.C. power unit assembly for producing rectified, multi-phase or single-phase, full-wave voltage. The assembly includes a plurality of single-phase, full-wave D.C. power u... | 07/24/1990 |
| 4733045 | Method of and structure for high speed resistance seam welding A method of and structure for high speed seam welding. The method comprises placing an auxiliary transformer between a three phase source of electrical welding energy and seam welder structure, which auxiliary transformer includes three separate primary w... | 03/22/1988 |
| 4717805 | Resistance welding control with menu type user interface Disclosed is an user interface with a resistance welding control which provides a visual presentation of character data unlikely to lead misinterpretation on user's part on a frame-by-frame basis using a menu and conversation system and can handle as many... | 01/05/1988 |
| 4682000 | Welding transformer and rectifier assembly The specification discloses a lightweight, compact welding transformer particularly well suited for robotic applications. The transformer includes coplanar secondary pads, a parallel common bus, and a secondary coil having turns each including a first end... | 07/21/1987 |
