Abstract: An engine driven welding machine in which a welding generator is driven by an engine, and the engine performs an idle operation when a welding operation is stopped by including an engine stop signal forming circuit which forms a stop signal for stopping an operation of the engine when time of the idle operation exceeds a predetermined time, a direct-current power supply connected to an output terminal of the welding machine, voltage detecting means which detects a voltage change of the output terminal, a restart detecting circuit which forms a restart signal for restarting the engine when the detected voltage by the voltage detecting means shows a predetermined change mode for starting the welding operation, and an engine control circuit which stops the engine in response to the stop signal, and restarts the engine in response to the restart signal.

Abstract: A shielded metal arc welding machine having a characteristic with a constant current output characteristic and a drooping output characteristic properly combined is provided. A shielded metal arc welding machine having a constant current output characteristic, characterized by having a desired drooping output characteristic, which has an optional drooping degree with a point at which a characteristic line of said constant current output characteristic intersects a welding load characteristic line L as a base point, and replaces said constant current output characteristic.

Abstract: A cooling fan for rotating machine having a sufficient cooling performance, mass production performance and easiness in mounting is provided.

Abstract: A coupling plate for an engine-driven generator on which a balance weight can be mounted and which is simple in structure and is constituted by a same hole making pattern. In a coupling plate for an engine-driven generator driving a generator by an engine, a plurality of elastic disks overlapped integrally are provided, and the elastic disks have one of the inner circumference side and the outer circumference side in the radial direction connected to the engine and the generator as the input side and the other as the output side, and in each of the elastic disks, a plurality of holes including small-diameter weight mounting holes and large-diameter weight escape holes distributed/arranged with a predetermined interval in the circumferential direction are drilled so that the holes of the respective disks are positionally overlapped with each other.

Abstract: To provide a protective cover capable of enhancing convenience in connecting and disconnecting an external output line and the like without impairing safety. In a protective cover placed on a side wall of a casing and covering a hollow part in which an output part of an apparatus housed in the casing is provided, the cover is characterized by including an outer lid which is supported by a hinge provided at an upper end to be openable and closable, and is provided, at a part close to a lower end, with a first locking member engaging with a catching member that is provided at a lower part of the hollow part, and an internal lid which is rotatably mounted to a position corresponding to the output part in an inner surface of the aforesaid outer lid to cover the output part. The internal lid is supported by a hinge.

Abstract: It is an object of the invention to provide an engine cooling apparatus that cools an engine according to an operation state of an engine driven work machine. The invention provides an engine cooling apparatus that is adapted to, in an engine drive work machine including an engine and a work machine driven by the engine, cool a radiator of the engine with an electric fan, the engine cooling apparatus including: at least one sensor that senses an operation state of the engine; and a control device that has an inverter, which uses a detection signal of the sensor as an input and the electric fan as a load, and performs operation control for the electric fan according to the operation state of the engine.

Abstract: An engine-driven work machine is attached to a pipe frame, and has a structure suitable for lifting. The engine-driven work machine has a transportable constitution attached to the pipe frame, and includes a collapsible sling fitting that is rotatably connected to the pipe frame.

Abstract: An engine-driven work machine enables the work machine and its electrical components to be properly cooled. An engine-driven work machine comprises an engine, a work machine driven by an engine, and electrical components belonging to the work machine, and supplies an output for work while being driven by the engine; the engine-driven work machine has an open machine accommodating section, which is provided in a main body of the work machine and accommodates an engine and a work machine driven by the engine, and a control box for accommodating part of the engine, electrical components of the work machine, and a fuel tank; the control box is provided above the machine accommodating section, and has a ventilation path that connects to a fan fitted to the engine, the electrical components and the fuel tank being arranged along the ventilation path.

Abstract: An engine driven arc welder including a welding generator driven by an engine; output circuits for controlling the output of the welding generator in accordance with a control signal and for delivering the output to welding output terminals; a current detector for detecting the current flowing in the welding output terminals; an error detector for comparing the output of the current detector with a reference signal to detect error; a control signal producing circuit for producing the control signal in accordance with output of the error detector and for delivering it to the output circuit; and a voltage detector R10, VR10 for detecting voltage to be delivered to the welding output terminals, wherein the arc welder has a welding output characteristic having a constant current control arc characteristic in accordance with the reference signal and which exhibits a drooping characteristic in the vicinity of the arcing voltage and which is capable of increasing the current when the arc voltage is lowered.

Abstract: A rotor with permanent magnet capable of fixing permanent magnets on the rotor iron core by a simple method. This rotor with permanent magnet comprises; a rotor iron core in which rotor iron plates provided with plural recessed portion in trapezoidal form at suitable intervals are formed in stacked manner on the outer circumference, fitting grooves comprised of continuity of the recessed portions on the outer circumferential surface thereof; a pair of end plates provided at respective end surfaces of the rotor iron core; fixing members formed by non-magnetic material, the fixing members being inserted into the respective fitting grooves to form a plurality of areas partitioned by the outer circumferential surface of the rotor iron core along with the end plates; and a plurality of permanent magnets fixed in the respective areas between these fixing members.

Abstract: Disclosed is an engine-driven welding generator using a plurality of neodymium-iron-boron based rare earth magnets and provided with countermeasures for suppressing a rise in temperature of the magnets.

Abstract: A rotor with permanent magnet capable of fixing permanent magnets on the rotor iron core by a simple method. This rotor with permanent magnet comprises; a rotor iron core in which rotor iron plates provided with plural recessed portion in trapezoidal form at suitable intervals are formed in stacked manner on the outer circumference, fitting grooves comprised of continuity of the recessed portions on the outer circumferential surface thereof; a pair of end plates provided at respective end surfaces of the rotor iron core; fixing members formed by non-magnetic material, the fixing members being inserted into the respective fitting grooves to form a plurality of areas partitioned by the outer circumferential surface of the rotor iron core along with the end plates; and a plurality of permanent magnets fixed in the respective areas between these fixing members.

Abstract: Disclosed is an engine-driven welding generator using a plurality of neodymium-iron-boron based rare earth magnets and provided with countermeasures for suppressing a rise in temperature of the magnets.

Abstract: There is provided an engine driven arc welder adapted for converting a.c. output of welding generator into d.c. output to allow it to undergo switching control by using a switching circuit to detect an output of the switching circuit to control its ON/OFF period by the detected content to control a welding current. The engine driven arc welder has a load limiting function. In this case, AVR is employed in a feedback control loop for generator voltage. The circuit configuration includes a F/V characteristic circuit and an output suppression circuit for comparing a detected voltage of the welding generator with a predetermined reference voltage to deliver, when the detected voltage is lower than the reference voltage, a signal for suppressing a welding output to a constant current control circuit for controlling welding current so that it becomes equal to a fixed value.

Abstract: There is provided an engine driven arc welder adapted for converting a.c. output of welding generator into d.c. output to allow it to undergo switching control by using a switching circuit to detect an output of the switching circuit to control its ON/OFF period by the detected content to control a welding current. This engine driven arc welder further has a reference signal formation circuit for forming a reference signal such that when a detected voltage across welding terminals is higher than a first predetermined value, it has a first reference value.