Abstract: A cylindrical boss hole 2a with a preferred tolerance is formed beforehand in the portion of a precision cast turbine blade unit 2, where it is to be joined to a rotor shaft 3. One end of the rotor shaft that has been finish machined beforehand is inserted into the hole 2a, and joint portions thereof are welded simultaneously by electron beam welding at a plurality of spots spaced at equal angles in the circumferential direction. Also, the turbine blades are machined using the outer periphery and the end surface of the previously finish machined rotor shaft as machining references. Thus, imbalances that are inevitably produced when using a conventional machining method can be greatly reduced, and the time needed to correct the imbalances is shortened and the yield of the products can be increased.

Abstract: A cylindrical boss hole 2a with a preferred tolerance is formed beforehand in the portion of a precision cast turbine blade unit 2, where it is to be joined to a rotor shaft 3. One end of the rotor shaft that has been finish machined beforehand is inserted into the hole 2a, and joint portions thereof are welded simultaneously by electron beam welding at a plurality of spots spaced at equal angles in the circumferential direction. Also, the turbine blades are machined using the outer periphery and the end surface of the previously finish machined rotor shaft as machining references. Thus, imbalances that are inevitably produced when using a conventional machining method can be greatly reduced, and the time needed to correct the imbalances is shortened and the yield of the products can be increased.

Abstract: In a system for detecting a relative position of an observation spot and reference points fixed around the observation spot, a central axis of mirror rotation is precessed to draw a substantially conical locus so that a light beam is vertically vibrated, the azimuth of the rotative scanning direction and the precessional angle are stored when the light beam reflected by a light reflector at the reference point is detected, then the projection direction of the light beam is fixed at the detected rotative scanning and precession angles, the distance between the observation spot and the light reflector is measured on the basis of the detected signals, and the positions of the light reflectors with respect to the observation spot are calculated on the basis of the measured distances and azimuths.

Abstract: A position detection system for a moving body comprising means for rotatively scanning the light beam projected from a light beam generator mounted on the moving body in a substantially horizontal plane, and vibrating to vertically vibrate the rotatively scanned light beam in a cycle two times or more longer than the cycle of the rotative scan. The light beam projected from the moving body and reflected by the retroreflector means provided at at least three positions spaced apart from the moving body is received by a light beam receiver on the moving body, and the position of the moving body is detected on the basis of the directions of the light reception and the known positional information on the retroreflector means.

Abstract: The present invention is characterized by the provision of a traveling course setting system for a moving vehicle comprising a light reflector that is moved along the peripheral outline of the work area for reflecting light in the direction of incidence, and a light beam generator mounted on the moving vehicle for circumferentially scanning a light beam around the moving vehicle. The system detects the distance between the moving light reflector and the moving vehicle and the azimuth of the moving light reflector relative to the moving vehicle on the basis of the light reflected from the moving light reflector, calculates the position of the moving light reflector based on the distance and azimuth with respect to the moving vehicle which are detected while the moving vehicle is stopped, stores the calculated position as a locus thereof, and sets a traveling course in the work area recognized on the basis of the stored locus of the moving light reflector.

Abstract: A position detecting system of a moving vehicle wherein a light beam scanned around the vehicle to be reflected by reference retroreflective means is received on the vehicle, the azimuth of each retroreflective means to be detected in the next scan is predicted, the azimuth of a particular incident light which forms the smallest angle with the predicted azimuth and is detected between two reference point discrimination azimuths preset at both sides of the predicted azimuth is judges to be that of an expected reflecting means and utilized for the position detection of the moving vehicle.

Abstract: A steering control system for a moving vehicle causes the vehicle to travel along a predetermined traveling course in a region in which a predetermined working operation, such as grass cutting or the like, is to be performed by the vehicle as it moves along the traveling course. An obstacle sensor is mounted on the vehicle, and when the sensor detects presence of an obstacle on the predetermined traveling course, the steering control system operates to cause the vehicle to leave the predetermined traveling course and to detour around the obstacle while maintaining a substantially constant distance between the obstacle and the moving vehicle.