Hitachi Koki Co., Ltd.

Mitsuhiro Sunaoshi

Yoshio Iimura

Hiroaki Orikasa

Kazuhiro Segawa

Masato Sakai

Takeshi Matsuoka

Toshiaki Uchida

Toshifumi Kubota

Shinki Ohtsu

Yukihiro Shima

Kenji Niwa

Mitsuo Ogura

Tsukasa Suzuura

Junichi Kamimura

Mitsuyuki Ishikawa

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

An air compressor includes: a tank portion for reserving compressed air used in a pneumatic tool; a compressed air generation portion for generating compressed air and supplying the compressed air to the tank portion; a drive portion including a motor for driving the compressed air generation portion; a control circuit portion for controlling the drive portion; and a pressure sensor for detecting pressure of the compressed air reserved in the tank portion. The control circuit portion includes a unit for controlling the rotational speed of the motor multistageously based on a detection signal output from the pressure sensor.

Air compressor and method for controlling the same

An air compressor includes: a tank portion for reserving compressed air used in a pneumatic tool; a compressed air generation portion for generating compressed air and supplying the compressed air to the tank portion; a drive portion including a motor for driving the compressed air generation portion; a control circuit portion for controlling the drive portion; and a pressure sensor for detecting pressure of the compressed air reserved in the tank portion. The control circuit portion includes a unit for controlling the rotational speed of the motor multistageously on the basis of a detection signal output from the pressure sensor.

For a motor that drives a compressed air generator, three operating modes which includes a powerful mode for rotating a motor in a high speed range, a silent mode for rotating the motor in a low speed range, and an automatic mode for automatically changing the rotation speed of the motor from the low speed to the high speed in accordance with a setup condition are prepared. A user can designate a desired operating mode by using an operating mode selection switch.

Air compressor having a controller for a variable speed motor and a compressed air tank

An air compressor comprises a tank portion for reserving a compressed air, a compressed air generating portion for generating the compressed air to be supplied to the tank portion, a motor for driving the compressed air generating portion, and a pressure switch mechanism having a pressure sensor in a part of the tank portion, and controlling the motor to be turned on or off in accordance with an output of the pressure sensor, characterized in that when the time change rate of the pressure within air tank is greater than a predetermined value, the motor is restarted without waiting until the pressure decreases to the switch on point at the time of pressure fall.

Pressure switch mechanism and air compressor using the same mechanism

Air compressor

An air compressor includes a tank unit storing a compressed air used by a pneumatic tool, a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit, a motor driving the compressed air generator, a drive portion including the motor, a controller portion controlling the drive portion and a pressure sensor detecting an air pressure of the compressed air in the tank unit, in which the controller portion controls a rotation speed of the motor at multiple levels based on a detection signal Pof the pressure sensor, a first differential signal which is a differential value d(P)/dt of the detection signal P, and a second differential signal which is a differential value d(P)/dt of a detection signal Pobtained by removing a pulsatory element from the detection signal P

Air compressor and control method therefor

A motor and a power transmitting mechanism are accommodated and supported in a two-piece housing unit separable into first and second housings. An air tank is defined by an outer surface of the second housing and an inside surface of a third housing provided on a recessed outer surface of the second housing.

Portable compressor

An air compression system for supplying a compressed air into a pneumatically operated tool. The system includes an air compressor and air accumulator connected to the compressor and having a first accumulator and a second accumulators separate therefrom. A relief valve is connected between the first and second accumulators for allowing the compressed air to flow from the first accumulator to the second accumulator when a pressure of the compressed air accumulated in the first accumulator increases to a predetermined pressure. A check valve is provided between the first and second accumulators and in parallel to the relief valve for allowing the compressed air to flow from the second accumulator to the first accumulator. The accumulator is connected to the pneumatically operated too. If the tool requires small amount of compressed air for operation, the compressed air supply into the first accumulator is only necessary to reduce recharging period.

Growing community of inventors

Ibaraki, Japan

Mitsuhiro Sunaoshi