Abstract: A power supply circuit includes a switching element provided with a control terminal for changing between an ON state and an OFF state, and an LC resonant circuit connected to the switching element and has a predetermined resonant frequency. A resistor connects to the control terminal of the switching element, and a feedback winding applies a feedback voltage derived from a high frequency signal across the LC resonant circuit to the control terminal through the resistor. A bias circuit connected to the feedback winding provides a bias voltage superimposed with the feedback voltage to the control terminal through the feedback winding and the resistor for alternately switching between the ON and Off states. The feedback voltage is delayed by a time defined by the resistor before being applied to the control terminal of the switching element.

Abstract: A non-contact electric power transmission device comprising a feeding member which includes an induction coil to which electric power is applied and the non-contact electric power transmission device further comprising a plurality of fed members which each further comprise an induced coil placed within a magnetic field produced by the induction coil. The fed members differ in the load applied and each of the fed members is independently designed to accommodate its respective load as well as to accommodate a single feeding member. While the respective loads differ, only the design of the respective fed member is modified to accommodate the different load value while no modifications to the single feeding member are made.

Abstract: A switch open-close state-detecting circuit for supplying an interrupt signal to a control terminal of a controller in response to a change of state of a switch to either open or closed state by giving a monitoring voltage to a plurality of switches to supply a change of the monitoring voltage corresponding to opening or closing of the switches to a plurality of input terminals of the controller by detecting the change of the monitoring voltage to supply to the control terminal of the controller for controlling the operation modes of the controller. The switch open-close state-detecting circuit has a control IC including the same number of a plurality of pairs of input terminal and a plurality of output terminals for generating interrupt signals at the output terminals only when supply voltages to pairs of input terminals of the control IC are not equal, and delay circuits connected between the input terminals of the control IC.

Abstract: A transformer-isolated power transfer apparatus included in a power supply body and a device body that are removably coupled together. The power supply body contains a primary winding and a secondary winding for transmitting electrical power. The device body contains an induction winding and a load. When the power supply body and device body are coupled together, the secondary winding in the power supply body is electromagnetically inductively coupled to the induction winding provided in the device body to transfer power from the power supply body to the device body via electromagnetic inductive coupling. The apparatus further includes detection circuitry that detects when the power supply body and the device body are coupled together.

Abstract: A non-contact electric power transmission apparatus including a power supply unit and a load unit. The power supply unit has a first oscillation circuit, a signal secondary winding, a filter circuit, and a driving control circuit. The load unit has a power secondary winding, a signal primary winding, and a second oscillation circuit. The first oscillation circuit has a power primary winding and intermittently oscillates at a first oscillation frequency. When the load unit is placed at a predetermined position with respect to the power supply unit, since signals are induced in the power secondary winding by the signals in the power primary winding, the second oscillation circuit oscillates at a second oscillation frequency which is different from the first oscillation frequency. The signals from the second oscillation circuit are transmitted from the signal primary winding to the signal secondary winding.

Abstract: Friction plates for a friction type coupling device for displaying a function of braking, holding, accelerating or decelerating by depressing and contacting one friction member against the other friction member of a friction type coupling device composed of two friction plates one fabricated of metals or non-metallic materials or inorganic material. One friction plate has a friction portion which is selectively depressed against the other friction plate and a remaining non-contacting portion. The friction portion is formed as a plurality of protrusions by cutting away, by engraving a plurality of grooves, by cutting away non-contacting portions or by positively forming a plurality of protrusions on the surface of the friction plate.

Abstract: An inverter power supply having a DC source, a transformer having a primary winding, a secondary winding, and a feedback winding, an L-C resonant circuit of a capacitor and the primary winding, and a self-excited oscillator. The oscillator includes an L-C resonant circuit and an FET connected in series with the primary winding across the DC source to generate a high frequency voltage across the primary winding, a feedback voltage across the feedback winding and a resulting output AC voltage across the secondary winding. A biasing capacitor is connected in parallel with a series combination of the L-C resonant circuit and the FET across the DC source to be charged thereby. The biasing capacitor is also connected in series with the feedback winding to provide an offset voltage which is additive to the feedback winding to give a bias voltage applied to a gate of the FET so as to alternately turn on and off the FET for driving the self-excited oscillator.

Abstract: In an assembly line of a vehicle body W, vehicle body parts differentiated in accordance with the vehicle body type are clamped on respective carriages travelling on an assembly line 1 for sequentially executing temporary welding and power-increased welding for assembling the vehicle body W. An exclusive carriage 3A (3B), clamping parts of the vehicle body W in position for temporary welding, causes a reciprocative movement between a part-supplying station S1 and a temporary welding station S2. A common carriage 10A carrying the vehicle body W causes a reciprocative movement between the temporary welding station S2 and a power-increased welding station S3. Welding robots 29, 29 of the temporary welding station S2 perform the temporary welding for connecting the parts clamped in position on the exclusive carriage 3A (3B). Thus temporarily welded body assembly is lifted and transferred onto a side rotary jig 24 and supported in position for power-increased welding.

Abstract: In a conventional frictional force transmitting device used in a vacuum, a problem has arisen when the device performs a sliding action over a certain distance, that is, its frictional force suddenly drops, which makes it impossible for the device to fulfill a desired function of braking. The above-mentioned problem in the frictional force transmitting device used in a vacuum for performing the function of braking, transmitting a frictional force, and effecting acceleration or deceleration, can be solved by improving the device, that is, by means of making its two opposing frictional elements so as to be selectively pressed against each other, in which one of the frictional elements is made of metal or of non-metallic materials and the other made of organic frictional materials, wherein the one of the frictional element made of metal or nonmetallic materials has surface roughness coarser than 3 microns in maximum height(Rmax) and is coarser than the other made of organic frictional materials.

Abstract: An inverter power supply operating at a high efficiency to provide an AC voltage to a load. The power source includes a DC voltage source and an output transformer with a primary winding, secondary winding, and a feedback winding. An FET is connected in series with the primary winding across the DC voltage source. The primary winding is connected to a capacitor to form a L-C resonant circuit which, in response to the switching of FET, provides across the primary winding an oscillation voltage to be applied through the secondary winding to drive a load, while inducing a feedback voltage across the feedback winding. The oscillation voltage is allowed to go negative at a point between FET and the primary winding. A biasing capacitor is connected to apply an offset voltage which is additive to the feedback voltage so as to give a bias voltage to FET.

Abstract: A connection condition between two adjacent original surfaces, selected from a plurality of connected original surfaces, is determined as to whether it is smooth, concave, or convex. Then, each of the original surfaces is offset at a predetermined distance along unit vectors normal to the original surface, to obtain an offset surface. Also, an original loop for each of the original surfaces is offset at the predetermined distance along unit vectors normal to the original surface at its edges to obtain an offset loop. Then, a new surface between two adjacent offset loops is interpolated when the connection condition is convex. A self-interference portion is removed when the connection condition is concave, so as to obtain a plurality of offset surfaces based on the plurality of original surfaces.

Abstract: An inverter power supply includes a DC supply providing a DC voltage from an AC mains, a transformer having primary, secondary, and feedback windings, and a self-excited oscillator energized by the DC supply to generate a high frequency voltage across the primary winding and induces across the secondary winding an output AC voltage for driving a load. The oscillator comprises an FET connected in series with the primary winding. A biasing capacitor is connected in series with the feedback winding across a source-gate path of FET for providing an offset voltage which is additive to a feedback voltage at the feedback winding to give a bias applied to a gate of FET so as to alternately turn on and off FET for self-excited oscillation.