Hitachi Koki Co., Ltd.

Hitachi Koko Co., Ltd.

Koki Holdings Co., Ltd.

Masahiro Inaniwa

Shinji Watanabe

Noriyasu Matsufuji

Yoshihiro Nakano

Hiroyuki Takahashi

Hiroyuki Oda

Yukihiro Shima

Hidetaka Osawa

Takashi Ueda

Takahiro Fujimaki

Yoshitaka Niinai

Hisanobu Ooyama

Nobuharu Kido

Kouichi Akatsu

Hiroshi Hayasaka

Shun Suzuki

Yoshinori Tobita

Yoshimasa Hayama

Daisuke Kakegawa

Yuki Hodotsuka

Kumio Takahashi

Tsutomu Takamura

Yoichi Ogawa

Hideki Hoshiba

Masaharu Aizawa

Katsunori Akatsu

Osamu Kawanobe

Kenichi Tetsu

Shinichi Haruki

Satoshi Numata

Sadato Igarashi

Masanori Yoshioka

Toyosaku Sato

Kouiti Akatsu

Hidetaka Ohsawa

Yoshiaki Sato

A centrifuge including: a rotor configured to hold a sample and configured to be detachably mounted, a rotation chamber accommodating the rotor, a plurality of motors configured to be rotationally driven by three-phase AC power, and a control device configured to control centrifuging operation, wherein one of the plurality of motors is a centrifuge motor configured to rotate the rotor, and the control device is configured to change distribution of power supplied to the centrifuge motor and power supplied to another motor of the plurality of motors during one operation.

Centrifuge having a plurality of inverters

A centrifuge including: a rotor configured to be driven by a motor and to hold a sample, a centrifuge inverter, a chamber accommodating the rotor, a temperature sensor configured to detect the temperature of the chamber, a cooling machine configured to cool the chamber and including a compressor, a compressor inverter, a compressor motor configured to be controlled in a variable speed and a control device, wherein the control device carries out a feedback control of the compressor motor based on a preset temperature and a detected temperature of the temperature sensor when the rotation number of the compressor motor is larger than a predetermined rotation number, and the control device carries out an intermittent control for turning ON-OFF the cooling function of the compressor when the rotation number of the compressor motor is smaller than a predetermined rotation number.

Centrifuge with compressor motor feedback control device

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.

Fastener driving tool

A centrifuge comprises a rotor for holding a sample, a rotation chamber for housing the rotor, a motor for rotating the rotor, an oil diffusion pump for reducing a pressure within the rotation chamber, and a control unit for controlling the heater temperature of the oil diffusion pump for a target set temperature. The control unit changes the target set temperature from a first given temperature to a second given temperature that is lower than the first given temperature after a given period of time elapses since the start of control of the heater temperature.

Centrifuge with vacuum pump and control method thereof

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().

To provide a dust collector which, even when it is used in a poor power supply situation, can detect the dust loading of a filter accurately, can remove dust automatically and can reduce power consumption. In the dust collector, there is provided a control circuit which can detect the dust loading of a filter by comparing the threshold value of the dust loading pressure to be determined by the internal pressure of the filter, the operation of a suction device, the power supply frequency of the suction device and the supply voltage of the suction device with the filter internal pressure just before the suction device stops, and, when the filter is dust loaded, can operate a dust removing device.

Dust collector

A dust collection device has a tank, a suction unit, a filtering unit, a dust removal unit, a first detection unit, and a control unit. The tank has an air inlet for accommodating dust. The suction unit aspirates the dust through the air inlet. The filtering unit captures the dust through the air inlet. The dust removal unit removes the dust from the filtering unit. The first detection unit detects an operational state of the suction unit. The control unit controls the suction unit and the dust removal unit. The control unit activates the dust removal unit, when the first detection unit detects that the suction unit operates for a first predetermined time period and then stops operating.

Dust collection device

A centrifugal separator is configured such that a switching unit adapted to be brought into electrical conduction or electrical nonconduction is electrically connected in a drive power supply line between a motor drive circuit of a control unit and a motor winding wire, and that the switching unit is controlled to be brought into nonconduction when a door is opened.

Centrifugal separator with door lock safety device

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 centrifugal separator is configured such that a switching unit adapted to be brought into electrical conduction or into electrical nonconduction is electrically connected between a motor housing and a motor-ground connection wire, and that the switching unit is controlled to be brought into nonconduction when a door is closed.

Centrifugal separator

A position of a piston fluid-tightly sliding along an inner surface of a pipette is instantaneously changed by a short distance to jet a portion of a liquid in the pipette through the nozzle of the pipette as a drop. The instantaneously changed position is provided by a motor which is commonly used for moderately changing the position of the piston to taking-in and taking-out the liquid. The instantaneous minute position changing may be provided with a piezoelectric actuator. An attachable nozzle cap having a nozzle-cap nozzle (through hole) of which diameter is smaller than that of the nozzle of the pipette may be used. The portion of the liquid jetted from the pipette may be detected. The instantaneous changing may be repeated to jet a desired amount of said liquid. The short distance may be adjusted in accordance with the desired amount.

Pipetting apparatus and a method of pipetting a liquid

A centrifuge includes a rotor, and a motor for rotating the rotor. At least three identification elements provided on the rotor are arranged along a circumference of a circle whose center coincides with an axis of rotation of the rotor. An angular interval between prescribed two of the at least three identification elements indicates a maximum allowable rotational speed of the rotor. One or more of the at least three identification elements indicates a type of the rotor. A sensor operates for detecting the at least three identification elements during rotation of the rotor. The angular interval between the prescribed two of the at least three identification elements is measured in response to an output signal from the sensor to detect the maximum allowable rotational speed of the rotor. The type of the rotor is detected in response to the output signal from the sensor.

Centrifuge with rotor having identification elements arranged along the circumference of a circle whose center coincides with the rotor's axis of rotation

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Ibaraki, Japan

Masahiro Inaniwa