Abstract: It is an object of the invention to provide a pump jack pump-off control method and a pump jack control apparatus in which, even when the speed of a pump jack is reduced due to generation of a pump-off condition, the pump jack is not caused to stop due to the motor overload abnormality or the coagulated crude oil and, even when the pump-off condition is generated, the reduction of the production capacity of the pump jack can be prevented as much as possible. On detecting the pump-off condition, while the pump jack is in operation with the speed thereof being reduced, or while the pump jack is in operation at the lowest speed, according to the overload warning signal of an ac electric motor, the pump jack is switched over to its intermittent operation.

Abstract: A double folding mechanism of a seat of a vehicle can fold a seat cushion from a space on a floor and fold a seat back into the space, thereby changing the seat from its use condition to its retracted condition. The double folding mechanism can include a first connecting mechanism connecting the seat cushion and the floor and a second connecting mechanism connecting the seat back and the floor. The second connecting mechanism can control the rotational speed of the seat back such that the seat back can enter inside a rotational trajectory of a rear end of the seat cushion after the seat cushion comes out of a rotational trajectory of an upper end portion of the seat back. The double folding mechanism can change the seat from the use condition to the retracted condition in one operation.

Abstract: An inverter circuit for discharge lamps for multi-lamp lighting in which the value of a negative resistance characteristic of a fluorescent lamp is controlled, and an excessively set reactance is eliminated by causing a shunt transformer to have a reactance exceeding the negative resistance characteristic. Two coils connected to a secondary winding of a step-up transformer of the inverter circuit are arranged and magnetically coupled to each other to form a shunt transformer for shunting current such that magnetic fluxes generated thereby cancel each other out. Discharge lamps are connected to the coils, respectively, with currents flowing therethrough being balanced. Each discharge lamp is lighted because a reactance of an inductance related to the balancing operation which is in an operating frequency of the inverter circuit, exceeds a negative resistance of the discharge lamps.

Abstract: In an outboard drive or an inboard-outboard drive, power generated by a single engine is transmitted in left and right directions from a main drive shaft, thereby finally causing left and right propellers to be rotated, the left and right propellers being arranged about the main drive shaft so as to be spaced apart from the main drive shaft at approximately equal distances from the main drive shaft and facing a travel direction of a marine vessel, the outboard drive or inboard-outboard drive being provided with left and right shift cam assemblies for causing rotation situations of the propellers to be controlled dependently from each other, the rotation situations including normal rotation, reverse rotation and non-rotation situations of the propellers.

Abstract: An inverter circuit for discharge lamps for multi-lamp lighting in which the value of a negative resistance characteristic of a fluorescent lamp is controlled, and an excessively set reactance is eliminated by causing a shunt transformer to have a reactance exceeding the negative resistance characteristic. Two coils connected to a secondary winding of a step-up transformer of the inverter circuit are arranged and magnetically coupled to each other to form a shunt transformer for shunting current such that magnetic fluxes generated thereby cancel each other out. Discharge lamps are connected to the coils, respectively, with currents flowing therethrough being balanced. Each discharge lamp is lighted because a reactance of an inductance related to the balancing operation which is in an operating frequency of the inverter circuit, exceeds a negative resistance of the discharge lamps.

Abstract: An inverter circuit for discharge lamps for multi-lamp lighting in which the value of a negative resistance characteristic of a fluorescent lamp is controlled, and an excessively set reactance is eliminated by causing a shunt transformer to have a reactance exceeding the negative resistance characteristic. Two coils connected to a secondary winding of a step-up transformer of the inverter circuit are arranged and magnetically coupled to each other to form a shunt transformer for shunting current such that magnetic fluxes generated thereby cancel each other out. Discharge lamps are connected to the coils, respectively, with currents flowing therethrough being balanced. Each discharge lamp is lighted because a reactance of an inductance related to the balancing operation which is in an operating frequency of the inverter circuit, exceeds a negative resistance of discharge lamps.

Abstract: A double folding mechanism of a seat of a vehicle can fold a seat cushion from a space on a floor and fold a seat back into the space, thereby changing the seat from its use condition to its retracted condition. The double folding mechanism can include a first connecting mechanism connecting the seat cushion and the floor and a second connecting mechanism connecting the seat back and the floor. The second connecting mechanism can control the rotational speed of the seat back such that the seat back can enter inside a rotational trajectory of a rear end of the seat cushion after the seat cushion comes out of a rotational trajectory of an upper end portion of the seat back. The double folding mechanism can change the seat from the use condition to the retracted condition in one operation.

Abstract: In an outboard drive or an inboard-outboard drive, power generated by a single engine is transmitted in left and right directions from a main drive shaft, thereby finally causing left and right propellers to be rotated, the left and right propellers being arranged about the main drive shaft so as to be spaced apart from the main drive shaft at approximately equal distances from the main drive shaft and facing a travel direction of a marine vessel, the outboard drive or inboard-outboard drive being provided with left and right shift cam assemblies for causing rotation situations of the propellers to be controlled dependently from each other, the rotation situations including normal rotation, reverse rotation and non-rotation situations of the propellers.

Abstract: A finishing wheel holding mechanism for a gear finishing apparatus using a finishing wheel having internal teeth, which permits simple and quick fitting or replacement of a finishing wheel is provided. The finishing wheel holding mechanism comprises a head frame 21 having at the center an opening portion for holding a finishing wheel, and an annular finishing wheel holder portion 22 for fitting finishing wheels A1 (A2), supported rotatablly within the opening portion of the head frame 21; and the finishing wheel holder comprises a support gear 50 having an open end portion 53 for finishing wheel insertion and an accepting portion 54 for fixing the finishing wheel, an annular shifting body 55 within the open end portion 53, a projection 57 contacting the finishing wheel to serve as a stopper, a pressing collar 58 inserted into the shifting body 55 to fix the finishing wheel by sliding the shifting body toward the finishing wheel, and an actuator 60 for driving the shifting body 55 toward the accepting portion.

Abstract: A finishing wheel holding mechanism for a gear finishing apparatus using a finishing wheel having internal teeth, which permits simple and quick fitting or replacement of a finishing wheel is provided. The finishing wheel holding mechanism comprises a head frame 21 having at the center an opening portion for holding a finishing wheel, and an annular finishing wheel holder portion 22 for fitting finishing wheels A1 (A2), supported rotatablly within the opening portion of the head frame 21; and the finishing wheel holder comprises a support gear 50 having an open end portion 53 for finishing wheel insertion and an accepting portion 54 for fixing the finishing wheel, an annular shifting body 55 within the open end portion 53, a projection 57 contacting the finishing wheel to serve as a stopper, a pressing collar 58 inserted into the shifting body 55 to fix the finishing wheel by sliding the shifting body toward the finishing wheel, and an actuator 60 for driving the shifting body 55 toward the accepting portion.

Abstract: An inverter circuit for discharge lamps for multi-lamp lighting in which the value of a negative resistance characteristic of a fluorescent lamp is controlled, and an excessively set reactance is eliminated by causing a shunt transformer to have a reactance exceeding the negative resistance characteristic, whereby shunting characteristics high in performance are obtained while reducing the size of the circuit. In an inverter circuit for discharge lamps for multi-lamp lighting, two coils connected to a secondary winding of a step-up transformer of the inverter circuit are arranged and magnetically coupled to each other to form a shunt transformer for shunting current such that magnetic fluxes generated thereby are opposed to each other to cancel out. Discharge lamps are connected to the coils, respectively, with currents flowing therethrough being balanced with each other.

Abstract: An inverter circuit for a discharge tube of the present invention comprises a transformer in which a resonance circuit is composed of a parasitic capacitance of a discharge tube, and a H-bridge circuit which drives the primary side of the transformer at a frequency that is lower than the resonance frequency of the resonance circuit and that involves a phase difference between the voltage and the current at the primary side of the transformer, the phase difference falling within a predetermined range from its minimum point.

Abstract: A pump off control method comprises detecting the speed of the induction motor and an instantaneous value of secondary current of the induction motor. Down stroke time in every cycle of the pump jack is detected. An average value of instantaneous values of the secondary current of the induction motor in the down stroke time in said every cycle is calculated. An average value reference of the secondary current of the induction motor to be compared with calculated average value of the instantaneous values of the secondary current of the induction motor is set. The calculated average value of the instantaneous values of the secondary current is compared with the average value reference after the down stroke end in each cycle. An occurence of pump off is detected if the calculated average value of the instantaneous values is greater than the average value reference.

Abstract: An inverter circuit for a discharge tube of the present invention comprises a transformer in which a resonance circuit is composed of a parasitic capacitance of a discharge tube, and a H-bridge circuit which drives the primary side of the transformer at a frequency that is lower than the resonance frequency of the resonance circuit and that involves a phase difference between the voltage and the current at the primary side of the transformer, the phase difference falling within a predetermined range from its minimum point.

Abstract: A driver circuit wherein a first switching element and a second switching element are totem-pole-connected, wherein the totem pole connection is connected at its one end, node and other end with a power source, an output to a load and a reference potential, respectively, wherein the first switching element is connected between the one end and the node, wherein the second switching element is connected between the node and the other end, and wherein a third switching element is connected between the one end of the totem pole connection and the control terminal of the first switching element.

Abstract: An address translation buffer system in which a searching time of an address translation buffer is shortened.

Abstract: For a semiconductor circuit having one or more semiconductor devices, such as an IGBT, a turn-ON prevention circuit is provided for each device which prevents the device from turning ON during OFF times thereof, due to the presence of a transient voltage (dV/dt) across the main terminals of the device. In accordance with such a scheme, a MOSFET is connected between the insulated-gate electrode and emitter of the IGBT, and a capacitor, for example, is connected between the gate of the MOSFET and a sufficient electric potential to thereby effect a temporary turn-ON of the MOSFET to remove parasitic charge build-up in the IGBT before such charge build-up has reached a potential of the turn-ON threshold of the IGBT during OFF times of the IGBT. The capacitance element can be constituted by a MOSFET, namely, the capacitance across the gate-to-drain of an additional MOSFET.

Abstract: A process for controlling crystalline orientation of an oxide superconductive film includes a first-heat-treatment step, and a second-heat-treatment step. In the first-heat-treatment step, an oxide superconductive film is heated and held in non-oxidizing atmosphere. Accordingly, partial oxygen deficiency is caused in the oxide superconductive film. In the second-heat-treatment step, the oxide superconductive film is heated and held in oxygen-rich atmosphere. Consequently, oxygen is re-introduced into the oxide superconductive film. Thus, crystalline orientation of the oxide superconductive film is altered. The process enables to readily form not only an "a"-axis-oriented oxide superconductive film but also a "b"-axis-oriented oxide superconductive film.

Abstract: A pipeline processor having a hardware loop function, and having transfer paths L14 and L13 which directly transfer a value of a flag register 10 being set according to the results of the operations to a loop control unit 11, and so configured that the loop control unit 11 reads the value of the flag register 10 via the transfer paths L14 and L13 and terminates a loop processing when it is the predetermined value. The loop processing can be terminated without adversely affecting the data processing efficiency when a conditional jump instruction is executed during the loop processing, and operations, data transfers and other processings can be executed other than a loop-escaping operation.

Abstract: An apparatus includes a constant voltage generator for generating a voltage based on a difference between threshold voltages of two MOS transistors, and a voltage sampling device for sampling the output voltage of the constant voltage generator circuit, wherein the voltage sampling device samples the output voltage of the constant voltage generator before an electric source switch for the constant voltage generator is turned off.