Koki Holdings Co., Ltd.

Hitachi Koki Co., Ltd.

Tatsuya Ito

Tomomasa Nishikawa

Takuya Konnai

Mizuho Nakamura

Yoshio Iimura

Satoshi Yamaguchi

Hiroyuki Hanawa

Hironori Mashiko

Hayato Yamaguchi

Takahiro Hirai

Tetsuhiro Harada

Tetsuhito Shige

Daiki Kiyohara

Masashi Takehisa

Hiroaki Irei

Kenta Harada

Hiromi Takahashi

Yang Li

Yuki Ishikawa

The present invention maintains compatibility with a power tool having no wireless connection function, and prevents malfunctions due to linked operation. A battery pack that supplies a driving power source to a power tool, said battery pack comprising: a wireless communication unit for communicating wirelessly with an external device; and a control unit that performs a first determination process to determine the state of a wireless communication connection with the external device, wherein when the control unit has determined in the first determination process that wireless communication has been established, the control unit transmits a linking command to the external device, and during a state in which the wireless communication has been established, the control unit can perform a communication connection cancellation process to cancel the wireless communication.

Battery pack and wireless linking system

A nailer for suppressing misfire while keeping operability. In a first mode, a control circuit drives a drive source when a second ON determination is made and a first ON determination is made in a state where a second operation unit is maintained at a second ON position, and when the drive source is driven and then a second OFF determination is made in a state where a first operation unit is maintained at a first ON position, the control circuit does not drive the drive source again unless returning to the initial state. In a second mode, the control circuit drives the drive source when the first ON determination is made and the second ON determination is made in a state where the first operation unit is maintained at the first ON position. A second OFF determination time in the second mode is longer than in the first mode.

Working tool

In the work device that has a self-holding circuit () maintaining power supply from a power supply circuit () by output from a microcomputer () and has a structure in which stopping output to the self-holding circuit () causes interruption of power supply from the power supply circuit () to the microcomputer (), the firmware of the microcomputer () is made to be rewritable and a power holding unit (condenser C) for temporarily continuing power supply to the microcomputer () is provided, thereby realizing a so-called 'off-delay timer function' for restarting the microcomputer (). This configuration enables maintenance of power to the microcomputer () after update of the firmware even in a work device that cannot be restarted once power has been turned off unless trigger operation is performed, thereby enabling automatic restart of the microcomputerafter resetting is enabled.

Work device

To provide a rotary impact tool capable of: suppressing a rise in temperature in a motor or switching elements and a current flowing in the motor or switching elements while suppressing a degradation in tightening performance; and improving operability. The rotary impact tool includes: a motor; an end-bit holding part driven by the motor; an impact mechanism provided on a drive transmission path from the motor to the end-bit holding part and configured to intermittently produce rotary impacts, the rotary impacts transmitting a drive force of the motor to the end-bit holding part; a switching element configured to change a voltage supplied to the motor; and a control unit controlling the switching element. The control unit is configured such that the voltage supplied to the motor begins to gradually rise within a period of time from a timing when a first rotary impact ends to a timing when a second rotary impact subsequent to the first rotary impact starts.

Rotary impact tool

A technique capable of immediately reporting to an operator an occurrence of abnormality in an electric tool is provided. A communication terminal includes a communication-terminal-side control unit that determines whether abnormality has occurred in any of electric tools based on information acquired from the electric tools via wireless communication. When the communication-terminal-side control unit determines the occurrence of abnormality in any one of the electric tools, the occurrence of abnormality in the electric tool is reported by at least one of a report unit included in the electric tools other than the electric tool in which the occurrence of abnormality is determined and a report unit included in the communication terminal.

Abnormality reporting system for electric tools

A technique capable of immediately reporting to an operator an occurrence of abnormality in an electric tool is provided. A communication terminalincludes a communication-terminal-side control unit that determines whether abnormality has occurred in any of electric tools, andbased on information acquired from the electric tools, andvia wireless communication. When the communication-terminal-side control unit determines the occurrence of abnormality in any one of the electric tools, and, the occurrence of abnormality in the electric tool, oris reported by at least one of a report unit included in the electric tools, andother than the electric tool, orin which the occurrence of abnormality is determined and a report unit included in the communication terminal

Abnormality reporting system and electric tool, and communication terminal

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

An electric working machine including: an input part; a control unit configured to control a motor in accordance with an operation amount of the input part; and a switching part; wherein, when a predetermined operation is performed to the switching part, the control unit shifts to a fixed control mode in which the motor is controlled in accordance with an operation amount of the input part at the time when the predetermined operation is performed to the switching part, irrespective of an operation amount of the input part after the predetermined operation is performed to the switching part.

Growing community of inventors

Ibaraki, Japan

Tatsuya Ito