Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Hitachi Koko Co., Ltd.

Yukihiro Shima

Yoshihiro Nakano

Hiroyuki Oda

Nobuhiro Takano

Kazuhiko Funabashi

Takashi Ueda

Masahiro Inaniwa

Hideyuki Tanimoto

Yasuki Ohmori

Shinki Ohtsu

Haruhisa Fujisawa

Takao Aradachi

Shinji Watanabe

Yasushi Nakano

Yoshio Iimura

Takuya Yoshinari

Mitsuhiro Sunaoshi

Kenji Niwa

Kenrou Ishimaru

Yuki Horie

Junichi Kamimura

Tomoaki Sudo

A power tool includes a motor, a connecting unit, and a controller. The connecting unit is configured to be connected to a secondary battery. A voltage detection unit is configured to detect a voltage of the secondary battery connected to the connecting unit. The controller is configured to acquire change of the detected voltage. The controller restricts the operation of the motor when the change of the voltage is a first value.

Power tool

An inverter device includes: an inverter circuit configured to perform ON/OFF operations with a preset duty cycle to convert a DC power into an AC power and output the AC power to an AC motor; and a controller configured to change a duty cycle of the ON/OFF operations.

Inverter device and electric power tool

The motorized cutter with wheels () comprises a motorized cutter () and a carriage (). The motorized cutter () is equipped with an engine (), a blade () rotatably driven by the engine (), and a light-emitting unit () that generates laser light () in the same plane as the plane of rotation of the blade (). A roadbed () is then cut along a line (X) drawn on the roadbed () by operating the motorized cutter with wheels () so that the line (X) is irradiated with the laser light (). It is possible to remove the motorized cutter () from the carriage () together with the light-emitting unit ().

Motorized cutter, motorized cutter with wheels, and cutting method

When the plunger is a game moved to a prescribed position Ph of an initial state on the upper dead point side by the drive force of the motor after the plunger is moved to the lower dead point side, the controller of a spring driven-type fastener driving tool reduces the rotational speed of the motor to a prescribed value or less based on the detection signal of the operation detection switch and then stops the slowed down motor. In order to achieve this, the plunger is stopped at a stop position of an initial state that is as close as possible to an upper dead point side drive start position and is subjected to a strong compression force by the drive spring.

Fastener driving tool

A spring-type fastener driving tool includes a plunger having a blade that drives in fasteners, a spring that urges the plunger downwards and is capable of being compressed upwards, a spring compression mechanism unit that includes a drum that causes the plunger to move in a compression direction of the spring based on rotational force of a motor, a reduction mechanism unit, and a one-way clutch than prohibits reverse rotation of the motor. Reverse rotation of the drum due to the urging force of the spring is prevented by providing the one-way clutch between an input side rotating shaft of the reduction mechanism unit and a rotation output shaft of the motor.

A fastener driving tool has a housing, a nose portion, a magazine, a motor, a plunger, a drive mechanism, a trigger switch, a detection switch, an energizing switch, a failure detection circuit. The magazine is configured to store and supply a fastener to the nose portion. The motor is provided in the housing. The a plunger is provided in the housing to move between a top dead center and a bottom dead center. The plunger has a blade for impacting the fastener. The drive mechanism is configured to drive the plunger with power from the motor. The trigger switch is configured to drive the drive mechanism, and operated by a user. The detection switch is configured to be switched according to an arrangement of the drive mechanism. The energizing switch is configured to control power feed of the motor. The energizing switch is switched by the trigger switch and the detection switch. The failure detection circuit is configured to turn off the energizing switch, based on a condition of the detection switch prior to impacting the fastener.

According to an aspect of the present invention, there is provided a driving device including: a driver bit for striking a fastener loaded in a launching section; a driver for driving the fastener from the launching section by reciprocating the driver bit; a triggering device pullable to control the driver; and a locking device that locks the pulling operation of the triggering device when being set to a lock position and that releases the locking state when being set to a release position, wherein the locking device includes a release device to operate the locking device toward the release position when the triggering device is pulled and a returning device to return the locking device toward the lock position when the pulling is released.

Driving machine

A controller controls a first FET to go on and off based on an input signal of a trigger switch and a push switch and controls a second FET to go on and off based on an input signal of a trigger switch, a push switch, and a operation detection switch. The controller then controls the time that the first FET is on for to be longer than the time the second FET is on for.

A controllerhas a single-driving mode/continuous-driving mode changeover switchfor performing fastener driving operation in a single driving mode or a continuous driving mode. In a case where the single-driving mode/continuous-driving mode changeover switchinstructs a single driving mode, the controllercauses a driver bladeto perform fastener driving operation when both a trigger switchand a push lever switchare switched, by switching operation, from the one switch status to the other switch status (e.g., the ON status). Consequently, fastener driving operation is made possible regardless of sequence of actuation of the trigger switchand the push lever switch

Electric driving machine

An electric driving machine includes a remaining fastener sensorwhich detects the amount of fasteners (e.g., nails) remaining, in an aligned and held manner, in a magazineand which generates a residual-quantity signal (a signal showing depletion of fasteners) when the amount of remaining fasteners has decreased to a predetermined level or less; a remaining fastener detection circuitwhich outputs a control signal (a signal of level) for controlling control means (, and other means) in accordance with an input of the residual-quantity signal (a switch-on signal) generated by the remaining fastener sensor; and a delay circuitfor delaying the remaining signal (the ON signal) generated by the remaining fastener sensorby a predetermined period of time (e.g., 20 milliseconds) and inputs the thus-delayed remaining signal to the remaining fastener detection circuit().

Even when a transient decrease has arisen in a battery voltage Vof a battery pack at startup of a motor that drives a flywheel, a power terminal Vcc and a reset terminal RES (or an input terminal IN of a reset IC) of a microcomputer are replenished with a normal voltage by the voltage accumulated by a capacitor of the backup power circuit, and hence a controller can maintain normal operation without involvement of faulty operation. As a result, even the battery pack whose battery has a smaller amount of remaining energy can be effectively utilized as the power source of an electric driving machine.

An electric driving machine has a motor for rotating a flywheel, power transmission for converting rotational drive force of the flywheel into rectilinear drive force and transmitting the rectilinear drive force to an actuator which fires a fastener, and engagement/disengagement arrangement which transmits the rotational drive force of the flywheel to a driver blade of interrupts transmission of the rotational drive force. The electric driving machine is provided with a second switching element connected in series with the engagement/disengagement arrangement and a third switching element connected in shunt with the engagement/disengagement arrangement. When a push lever switch is in an OFF position where driving of a fastener is not ready, the third switching element is held in an ON state.

A combustion-powered nail gun drives nails into a workpiece when both a head switch and a trigger switch are turned ON while a safety switch is turned ON. The nail driving operation cannot be performed if the safety switch is not ON even if both the head switch and the trigger switch are ON. The head switch is turned ON when a push lever is urged against the workpiece. Fuel/air mixture in a combustion chamber is ignited when the head switch and the trigger switch are turned ON irrespective of an order in which the head switch and the trigger switch are turned ON, whereby 'successive-shot driving' can be performed in which the trigger switch is maintained in its ON position while successively driving a plurality of nails at different locations of the workpiece by repeatedly pushing and releasing the push lever toward and away from the workpiece.

Growing community of inventors

Hitachinaka, Japan

Yukihiro Shima