Abstract: A power generator includes: an output information acquisition unit which acquires output information including power-generating component capacity information indicative of a capacity of a power-generating component and output frequency information indicative of an output frequency of the power generator; an ammeter which measures a current flowing through a distribution path; a breaker provided in the distribution path; and a controller. The controller calculates an allowable current based on the output information, and controls the breaker to interrupt the distribution path when a current measured by the ammeter exceeds the allowable current.

Abstract: An electric power work device simplifies a mechanism of a battery attachment part and easily removes a battery from the battery attachment part. A chain saw includes a body case, a cutting part (a work tool), and the battery. A battery removal mechanism for removing the battery is provided on a rear part of the body case. The battery removal mechanism includes a lower end of the battery and a bottom surface of the body case. The lower end of the battery protrudes downward from the bottom surface of the body case, and a frontmost end of a lower part of the battery is disposed in front of a rear end of a lower part of a top handle. Another battery removal mechanism includes a protrusion on the bottom surface of the body case and in front of the lower end of the battery.

Abstract: Provided is a portable brush cutter with reduced weight and size due to its simple structure with a small number of components that is capable of improving durability and the like as well as effectively suppressing torsional vibration of a transmission shaft. In the portable brush cutter, a one-way clutch to prevent generation of torsional vibration in a rotation transmission path is interposed between an output shaft and a transmission shaft, and bearings are adjacently mounted on the opposite sides of the one-way clutch.

Abstract: Provided is a battery-powered working machine including a protective bracket which is able to be secured to a casing while being in engagement with a battery pack, which is capable of preventing theft of the battery pack, and which separates a casing-side connection terminal from a battery-side connection terminal at a distance to keep the casing-side and battery-side connection terminals and out of contact with each other.

Abstract: An engine-driven working machine according to the present invention has a controller and a muffler. The controller is operated from starting of the engine in a rotational speed limitation mode in which the engine is prevented from rotating at a rotational speed that is higher than the predetermined limitation rotational speed. The controller forces to stop the engine, after a predetermined period has passed, during which the engine operates in the rotational speed limitation mode.

Abstract: An axial flow blower comprises a housing having a suction opening and an ejection opening formed thereon and having an air blow passage formed therein through which the suction opening and the ejection opening are in communication with each other, a motor case disposed in the air blow passage, a motor housed in the motor case, an air blow fan connected with a driven section of the motor and configured to rotate on a driving force of the motor to blow air from the suction opening toward the ejection opening and an air communication passage provided between an outside of the air blow passage and an inside of the motor case. An outflow hole is bored through the motor case and in communication with the air blow passage and an outer space outside the housing is in communication with an inner space inside the motor case through the air communication passage.

Abstract: To improve responsiveness of fuel supply control, a rotary carburetor 100 has a nozzle 8 including a fuel discharge port 8a and a needle 10 disposed coaxially with the nozzle 8 and disposed with a portion inserted into the nozzle 8. The needle 10 can be displaced relative to the nozzle 8 to change an effective area of the fuel discharge port 8a. The rotary carburetor 100 has an electric motor 14 for displacing the needle 10 along an axis, and a drive mechanism component 12 interposed between the electric motor 14 and the needle 10 and converting a rotational movement of the electric motor into a linear movement.

Abstract: Provided is a stratified scavenging engine and a portable work machine that suppress THC sufficiently. A stratified scavenging engine includes: a cylinder having a cylinder bore; and a piston stored in the cylinder bore to be movable in a reciprocating manner. The cylinder has an intake port to intake leading air and a scavenging port to scavenge combustion gas, the intake port and the scavenging port being open to the cylinder bore. The piston has a peripheral surface including a piston groove to guide leading air from the intake port to the scavenging port, and the piston groove has a recess near the intake port.

Abstract: A handle includes: a switch lever having an operational portion in an inverted U-shape, and configured to press an on/off switch when the operational portion is gripped and pressed; a handle body provided with the on/off switch mounted thereto and having an inner peripheral slit from which the operational portion of the switch lever housed in the handle body projects; a spring having a supported portion and a pair of arms extending from the supported portion, housed in the handle body, and biasing and pushing the switch lever back; and a plurality of limiters provided at locations in either the handle body or the switch lever at a distance from the spring, and configured to limit movement of the switch lever.

Abstract: A needle valve body (220) has a needle hollow part (230) and a slit (232) extending in an axial direction and opened forward in a tip region. The carburetor body (B) has a body hole (202) receiving the needle valve body (220) in a longitudinally displaceable manner along an axis and a step-part circumferential edge (240a) formed in the body hole (202) and forming an orifice (250) with the slit (232) of the needle valve body (220). By operating the needle valve body (220) to adjust the size of the orifice (250), an amount of fuel supplied to a fuel discharge part (Fout) can be adjusted.

Abstract: A hedge trimmer capable of effectively increasing the rigidity of a cutter assembly as well as reducing its weight, and easily adjusting the clearance for sliding of cutters, thereby improving the operability and addressing degradation of the cutting performance of the cutters is disclosed. In the cutter assembly, upper and lower cutter supports are provided with a plurality of clamping portions at predetermined intervals for increasing the rigidity, each clamping portion having a square tube-like spacer and a first bolt. In addition, at least one adjusting portion having a second bolt for adjusting the separation distance between the upper and lower cutter supports is provided between adjacent clamping portions.

Abstract: A power generator includes: an output information acquisition unit which acquires output information including power-generating component capacity information indicative of a capacity of a power-generating component and output frequency information indicative of an output frequency of the power generator; an ammeter which measures a current flowing through a distribution path; a breaker provided in the distribution path; and a controller. The controller calculates an allowable current based on the output information, and controls the breaker to interrupt the distribution path when a current measured by the ammeter exceeds the allowable current.

Abstract: The invention is directed to a portable power working machine in which a casing has a side surface in which a suction port is provided. A block prevention guard is attached to the side surface of the casing. The block prevention guard comprises a top surface opening formed in the block prevention guard to at least partially overlap the suction port. The block prevention guard further comprises a plurality of legs standing from the side surface of the casing to maintain the top surface opening at a distance from the side surface. In addition to the top surface surface, an air flow window is formed between two adjacent legs in the circumferential direction of the top surface opening.

Abstract: To optimize fuel supply of an engine with a carburetor during engine operation, a throttle opening degree detection sensor detecting a throttle opening degree and a control unit controlling a valve body variably controlling an opening degree of a fuel discharge part or a fuel supply passage based on a map are included. The map includes a plurality of sections divided based on the throttle opening degree and an opening degree of the valve body set for each section. The opening degree of the valve body set for each section is the opening degree of the valve body at which the engine rotation speed is highest in each section. The control unit controls an electric actuator driving the valve body to achieve the opening degree of the valve body set in a section to which the throttle opening degree detected by the throttle opening degree detection sensor belongs out of the plurality of sections.

Abstract: A handheld engine-driven working machine comprises an internal combustion engine and an ignition control device; wherein the ignition control device can switch its control between a normal mode and a operation mode, wherein during the operation mode, the ignition timing within the high speed range is maintained at a second BTDC angle, and the ignition timing within the medium speed range is advanced more than a third BTDC angle between a first BTDC angle and the second BTDC angle, and wherein at any rotational speed within the medium speed range, the ignition timing during the operation mode is advanced more than the ignition timing during the normal mode.

Abstract: The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove 8 formed in a peripheral surface of a piston includes a pressure transmission through hole 10, and the pressure transmission through hole 10 consistently communicates with a crankcase. In the course of the piston moving up, upon a pressure in the crankcase becoming negative, the negative pressure in the crankcase affects the piston groove 8 through the pressure transmission through hole 10. Consequently, a pressure in the piston groove 8 is released to the crankcase through the pressure transmission through hole 10. Upon the piston moving up and the piston groove 8 being thereby brought into communication with the air port 4a, air enters the piston groove 8 through the air port 4a ((III) of FIG. 1).

Abstract: The hand-held cutter includes: a cutting blade which is configured to rotate about a rotation shaft to cut a target; a cutter body which rotatably supports the cutting blade; a protection cover which covers a portion of the cutting blade and is rotatable about the rotation shaft; a pressing mechanism which is configured to move toward the protection cover to press a guide plate onto a support plate so as to impose and maintain restrictions on rotation of the protection cover; and a torsion coil spring exerting a biasing force to move the pressing mechanism toward the protection cover. The hand-held cutter is configured such that moving the pressing mechanism, against the biasing force of the torsion coil spring, away from the protection cover removes restrictions on the rotation of the protection cover.

Abstract: An engine-driven working machine includes a controller, which varies a control value of a solenoid valve so as to decrease or increase an opening degree of the solenoid valve when a rotating speed of an engine is within a predetermined high rotating speed range and the rotating speed of the engine is lower or higher than a predetermined rotating speed, respectively. When the control value of the solenoid valve is varied so as to decrease the opening degree of the solenoid valve and corresponds to a predetermined opening degree larger than a fully-closed state, the control value is set to a limitation value.

Abstract: To satisfy both a request for ensuring worker's safety at the engine start and a worker's request for promptly starting a work, on the premise of a working machine including an engine RPM suppression mode. A working machine (1) has a centrifugal clutch (6). The engine RPM suppression mode is executed at the start of an internal combustion engine (2). With the RPM suppression mode, the RPM of the internal combustion engine (2) is controlled not to exceed a clutch-in RPM. The working machine (1) has a mode cancelling means (S5) canceling the engine RPM suppression mode when a predetermined mode cancelation condition for cancelling the engine RPM suppression mode is satisfied, and a cancellation condition changing means (S2) changing the mode cancelation condition depending on a change in an engine operational state and/or an environment.

Abstract: Provided is an engine knocking detection apparatus capable of reasonably implementing necessary measures for water and dust proofing and against breaking of a cable, and the like at low cost as well as precisely detecting and effectively suppressing or avoiding knocking while suppressing cost and weight increases as much as possible. The engine knocking detection apparatus is adapted to detect knocking in an engine that adopts a flywheel magneto ignition system with an ignition coil unit securely attached to a cylinder, the ignition coil unit including an iron core, a coil wound around the iron core, and a control circuit board attached to the coil, and has an accelerometer for knocking detection attached to the iron core of the ignition coil unit.