Anritsu Infivis Co., Ltd.

Yuken Kogyo Kabushiki Kaisha

Akira Ohashi

Susumu Yoshino

Takashi Yoshioka

Yuki Hayakawa

Toshio Hashimoto

Eiji Taniguchi

Yasuyuki Shingu

Masao Egi

Siro Hattori

Tomohiko Yamaguchi

A metal detection apparatus comprises: a detection circuit unit () that detects a first variation component having a large influence of workpiece and a second variation component having a large influence of metal; a determination unit () that compares the two variation components to perform a metal determination process in the workpiece (W); and a detection condition adjustment unit () that adjusts detection conditions of both variation components. A foreign matter waveform storage unit () stores a test variation component accompanying temporal change due to metal influence is further provided. The detection condition adjustment unit sets a specific processing condition of detection processing in the detection circuit unit based on the first variation component based on the magnetic field variation signal at the time when the work W including no metal passes through the inspection zone Z and the second variation component constituted by the test variation component.

Metal detection apparatus

A variable displacement piston pump of the type in which the hydraulic pressure in a pressure chamber of an output flow variable element is controlled by a proportional electro-hydraulic control valve to control the displacement of the variable element against a spring to vary the output flow within a range between a maximum output flow and a full cut-off and the output pressure or both the output pressure and the output flow of the pump are controlled electro-hydraulically through a closed loop. The variable displacement piston pump includes flow detector for generating an electric signal corresponding to the output flow of the pump, pressure detector for generating an electric signal corresponding to the output flow of the pump, and control amplifier responsive to the difference between a flow setting signal and the output signal of the flow detector to control a driving control current supplied to the proportional electro-hydraulic control valve and also responsive to the detected output pressure reaching a predetermined value to control the driving control signal in accordance with the difference between a pressure setting signal and the output signal of the pressure detector.

Variable displacement piston pump

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Kanagawa, Japan

Akira Ohashi