Koki Holdings Co., Ltd.

Hitachi Koki Co., Ltd.

Hironori Mashiko

Tomomasa Nishikawa

Mizuho Nakamura

Katsuhiro Oomori

Yuta Noguchi

Nobuhiro Takano

Takashi Ueda

Kazutaka Iwata

Yutaka Ito

Hideyuki Tanimoto

Atsushi Nakagawa

Hiroki Uchida

Hayato Yamaguchi

Saroma Nakano

Kazuhiko Funabashi

Chikai Yoshimizu

Junichi Toukairin

Yoshikazu Kawano

Masayuki Ogura

Toshiaki Koizumi

Takuhiro Murakami

Yoshio Iimura

Toshinori Yasutomi

Takuya Yoshinari

Shota Takeuchi

Hideyuki Hashimoto

Tatsuya Ito

Hironori Sakai

Shigeru Takahashi

Yuki Mitoma

Yuki Takahashi

A driver capable of suppressing an increase in a load of a bumper is provided. The driver includes a striking portion provided movably and configured to move to strike a fastener; a bumper configured to be in contact with the striking portion to restrict a range of movement of the striking portion; and a housing configured to support the bumper, the driver further including a load suppressing portion configured to suppress an increase in a load of the bumper based on the load of the bumper detected by a load detection portion or number of operations of the striking portion within a predetermined time.

Driver

Provided is a rotary tool. In the rotary tool, the rotating tip tool is mounted on a spindle by the fixture, and the spindle and the tip tool are rotated by a motor. The rotary tool has a switch which can switch the motor between a rotation state and a stop state, and a control device which controls the rotation of the motor corresponding to the operation of the switch. When the switch is turned off after a required time T elapses after the motor is started, the control device stops the rotary tool () by performing a common braking operation on the spindle, and when the switch is turned off before the required time T elapses after the motor is started, the control device stops the tip tool () by inertia without applying a braking force.

Rotary tool

A driver capable of suppressing an increase in a load of a bumper is provided. The driverincludes a striking portionprovided movably and configured to move to strike a fastener; a bumperconfigured to be in contact with the striking portionto restrict a range of movement of the striking portion; and a housingconfigured to support the bumper, the driverfurther including a load suppressing portion configured to suppress an increase in a load of the bumperbased on the load of the bumperdetected by a load detection portion or number of operations of the striking portion within a predetermined time.

A driver capable of achieving favorable workmanship at the time of driving of a fastener into a workpiece to be driven is provided. In a driver having a striking unit; a first bias unit causing the striking unit to strike a fastener; a first operational unit and a second operational unit, and a control unit moving the striking unit in a first direction, the control unit can select a first driving mode, a second driving mode and a limitation mode, the first driving mode moving the striking unit in the first direction so that the fastener is struck when the first operational unit is operated after the second operational unit is pressed against the workpiece to be driven, the second driving mode moving the striking unit in the first direction so that the fastener is struck when the control unit detects the operation of the first operational unit and the pressing of the second operational unit against the workpiece to be driven, and the limitation mode limiting the second driving mode on the basis of a movement state of the striking unit.

A drilling tool includes: a drive source; a bit attachment portion to which an end bit is attachable; a power transmission portion configured to apply a motive force to the end bit attached to the bit attachment portion; an operation portion switchable between an ON-state and an OFF-state by a manual operation and configured to receive a setting operation for setting a stop condition; and a controller configured to set the stop condition based on the setting operation, and to start driving of the drive source in response to a first switching operation for switching the operation portion from the OFF-state to the ON-state. In a state where the stop condition is set, even when the operation portion is in the ON-state, the controller stops driving of the drive source in response to the stop condition being met while the drive source is being driven.

Drilling tool

A power tool includes: a battery connecting part to which one of a first battery pack and a second battery pack having capacity smaller than that of the first battery pack is detachably attachable; a motor driven by electric power supplied from the battery pack; current detection means configured to detect a discharge current flowing from the battery pack to the motor; cut-off controlling means configured to cut off the discharge current when the discharge current becomes equal to or larger than a current threshold; and battery type discrimination means configured to discriminate the battery pack connected to the battery connecting part. The current threshold when the second battery pack is connected to the battery connecting part is lower than that when the first battery pack is connected to the battery connecting part.

Power tool

A driver has: a wheel that is rotationally driven by an electric motor; pins provided to the wheel and arranged along a circumferential direction of the wheel; a piston reciprocably housed in a cylinder; a driver blade that integrally reciprocates with the piston; racks provided to the driver blade along an axial direction of the driver blade; and a controller configured to control a drive of the electric motor by PWM. The controller changes a duty ratio of the switching element provided on a power supply line for the electric motor in response to a change in remaining battery level as one of situations that affects a moving speed of the piston from the bottom dead point side to the top dead point side.

In order to provide an impact tool which is capable of increasing a striking force in a rotational direction of being applied from a hammer to an anvil, the impact tool includes: an electric motor; an anvil which supports a work tool and is driven by the electric motor; and a hammer which applies the striking force in the rotational direction to the anvil. The impact tool is provided with: a spindle which is arranged to be concentric with the anvil, supports the hammer to be movable in an axial direction and the rotational direction with respect to the anvil, and transmits motive power of the electric motor to the anvil; and a control unit which controls rotation speed of the electric motor. The number of strokes of the anvil due to one rotation of the hammer differs in response to rotation speed of the electric motor.

Impact tool

In order to provide an electric tool with good operability that can extend the life of and suppress breakage of a switching element for controlling energization of a brushless motor, a control unit (), after an operation switch () is turned off, does not immediately turn off an inverter circuit () (does not set the duty of a PWM signal to 0), and instead normally operates the inverter circuit () with a low-duty PWM signal and waits until a rotation speed of a brushless motor () reaches a predetermined rotation speed or less to turn off the inverter circuit () (to set the duty of the PWM signal to 0).

Electric tool

An electronic pulse driver includes a motor, a hammer, an anvil, an end tool mounting unit, a power supply unit, and a control unit. The hammer is rotatable together with the anvil. The end tool mounting unit transmits the rotation of the anvil to an end tool. The power supply unit supplies a drive electric power to the motor. The control unit controls the power supply unit to halt a supply of the drive electric power to the motor when an electric current flowing to the motor increases to a prescribed value. The control unit controls the power supply unit to supply to the motor a prestart electric power lower than the drive electric power before supplying the drive electric power in order to permit the power supply unit to supply the drive electric power after the hammer is in contact with the anvil.

An electric tool including: a motor configured to drive a front end tool; a control device configure to control rotation of the motor; a storage part configured to store a method of driving the motor by the control device; and a communication terminal to which a communication line for reading or writing information of the storage part is configured to be connected.

Electric tool and communication plug for electric tool

According to an aspect of the present invention, there is provided an impact tool including: a motor; a hammer connected to an output portion of the motor; and an anvil to be struck by the hammer in a rotation direction and having a rotary shaft, the hammer striking the anvil in the rotation direction by driving the motor in pulses, wherein the anvil is provided in front of the hammer, wherein the hammer is driven in pulses by the motor, and wherein a rotation angle of the hammer is substantially proportional to a rotation angle of the motor.

An impact tool () includes a motor (); a hammer () having a rotational axis extending in a first direction, the hammer () being rotatable in a rotational direction including a forward direction and a reverse direction opposite to the forward direction by the motor () and being movable in the first direction and a second direction opposite to the first direction; an anvil () disposed at the first direction side of the hammer () and strikable by the hammer () in the forward direction, the hammer () that has been struck the anvil () being moved in the second direction to come free from the anvil (); and a fixing member (A,A) that selectively allows the hammer () to move in the second direction or prevents the hammer () from moving in the second direction.

According to an aspect of the present invention, there is provided an impact tool including: a motor drivable in an intermittent driving mode; a hammer connected to the motor; an anvil to be struck by the hammer to thereby rotate/strike a tip tool; and a control unit that controls a rotation of the motor by switching a driving pulse supplied to the motor in accordance with a load applied onto the tip tool.

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Ibaraki, Japan

Hironori Mashiko