Hitachi, Ltd.

Nihon Radiator Co., Ltd.

Pacific Machinery and Engineering Co. Ltd.

Hitachi Keiyo Engineering Co., Ltd.

Shigeyoshi Yokoyama

Tetsuo Fukazawa

Raiji Shimomura

Tatsuya Seshimo

Tukasa Shiina

A method and a system for controlling a welding robot is disclosed, in which at the time of restarting the welding operation after a provisional welding stoppage which may occur during a series of welding operation by a robot, the welding operation is restarted from a position receded along the welding line thus far followed. A memory unit sequentially holds the position data along the welding line during the welding operation. The position receded along the welding line is calculated in accordance with the position data held in the memory unit during the provisional welding operation stoppage.

Method and apparatus for welding robot control

A centrifugal pump including a stationary guide vane secured to a casing, and a centrifugal impeller arranged for rotation in the casing in a position adjacent the stationary guide vane. The centrifugal impeller has at least one blade wound in convolutions on a peripheral surface of a hub and having a blade inlet surface substantially perpendicular to the axis of rotation of the impeller and a fluid flow entrance surface substantially parallel to the blade inlet surface. The blade is wound in a suitable number of convolutions extending from an inlet to an outlet on the hub and is forwardly inclined toward the axis of rotation of the impeller at an increasingly greater angle in going from the inlet toward the outlet, so as to produce centrifugal forces at the outlet. The centrifugal impeller has a high head which has been beyond the power of axial impellers to achieve.

Centrifugal pump

A centrifugal pump capable of rotating in a normal direction while enabling a fluid to flow in a normal direction and rotating in a reverse direction while enabling the fluid to flow in the reverse direction without having its pumping efficiency dropping to a lower level in a reverse rotation mode than in a normal rotation mode. The pump includes two pump casings each having an inlet and outlet portion extending tangentially of each pump casing and connected together through an intermediate casing to provide a unitary structure in which the two pump casings are located concentrically in face-to-face relation, and an impeller having a helical blade extending axially from one zone in one pump casing into another zone in the other pump casing for rotation along the center axis of the pump. The impeller has a minimum outer diameter at the center of its center axis and includes portions each flaring in one of axial opposite directions in the form of a cone. The impeller has an outer periphery cooperating with an inner periphery of the intermediate casing to define a small clearance therebetween. The inlet and outlet portions of the two pump casings are arranged such that when the two pump casings alternately act as a suction casing at the time of normal rotation and reverse rotation, the influx direction of the fluid through the inlet and outlet portion of the pump casing acting as a suction casing is opposed to the direction of rotation of the impeller means.

Reversible centrifugal pump

A control system and method for an industrial robot, wherein one of a plurality of command transforming programs is selected automatically depending on the number of transformed reference points (Pcn) which have been instructed, and the selected program transforms model commands into executable commands by which the robot is operated. Each transformed reference point corresponds to a model reference point (Ptn) and the model reference points are in a unique positional relation with the model commands.

Growing community of inventors

Sakura, Japan

Shigeyoshi Yokoyama