Abstract: Provided is a water quality management apparatus for an aquaculture pond, the apparatus having a storage unit for storing water quality-related measured values measured at appropriate time intervals by external sensors set in the aquaculture pond, an assessment unit for calculating a predicted future value on the basis of fluctuations in the measured values and determining the time when the predicted value will exceed a reference value that indicates deterioration of water quality, and a display unit for displaying the time when the reference value will be exceeded. Said time is the time when exchange of pond water will be necessary.

Abstract: Provided is a water quality management apparatus for an aquaculture pond, the apparatus having a storage unit for storing water quality-related measured values measured at appropriate time intervals by external sensors set in the aquaculture pond, an assessment unit for calculating a predicted future value on the basis of fluctuations in the measured values and determining the time when the predicted value will exceed a reference value that indicates deterioration of water quality, and a display unit for displaying the time when the reference value will be exceeded. Said time is the time when exchange of pond water will be necessary.

Abstract: An apparatus (10) for melt-adhering resin pipes, comprising support means (11, 12) for supporting a resin pipe (1) engaged with a resin joint (2), and laser irradiation means (30) for irradiating a laser beam onto a portion of the resin pipe engaged with the resin joint. Further, an axial direction driving means and a circumferential direction driving means may be provided so that the laser irradiation means (30) moves in the circumferential direction and in the axial direction of the resin pipe.

Abstract: A light source unit includes an emission surface and a plurality of point light sources arranged on the emission surface. An optical system focuses a plurality of light beams emitted from the point light sources into a single light beam and irradiates a target object to be irradiated with the single light beam. The single light beam is obtained with a desired light intensity profile according to a combination of positions where the point light sources are arranged and intensity distributions of the light beams emitted from the point light sources.

Abstract: The invention is aimed at the provision of an automatic releasing-type rolling head for forming a tapered thread on a pipe in which the shock generated at the end of the thread rolling operation is alleviated and a thread automatic rolling roller retracting mechanism is not damaged. The rolling head includes shaft bearing plates 33 which are slidably supported in a plurality of guide grooves 36 radially provided on inner surfaces of the front and rear closures of the housing 30 and which are provided on their outer surfaces in the radial directions with oblique surfaces 33b, thread rolling rollers 35 rotatably supported by the shaft bearing plates 33, a cam ring 31 which rotates in the housing 30 and has cam oblique surfaces 31a opposed to the oblique surfaces 33b of the shaft bearing plates 33, a lever 44 which abuts at its oblique surface against a cam member 45 to prevent movement thereof in association with the cam ring 31 and an abutment member 41 which is pressed and moved by a thread-rolled pipe.

Abstract: An adjusting apparatus for a roll threading die head with a head body having a plurality of threading rollers located on an imaginary circle concentrical to an axis of a cylindrical workpiece to be threaded. There are provided eccentric bearings which rotatably support the corresponding threading rollers and which are rotatable about axes eccentric with respect to the axes of rotation of the respective threading rollers. The eccentric bearings are simultaneously rotated by a rotor about their axes by the same angular displacement.

Abstract: A motor driven flaring device in which a rotatable eccentric cone an apex of which defines a fixed center of rotation is pressed, while rotating, against an end of a pipe to be flared, including a body having a motor incorporated therein and having an output shaft to be connected to a drive source, a rotational drive shaft connected to the output shaft of the motor so as to relatively move in the axial direction thereof, a feed screw shaft member connected to the rotational drive shaft and screw-engaged by the body so as to rotate and move in the axial direction thereof, and a one-direction rotation transmission mechanism between the rotational drive shaft and feed screw shaft member for transmitting the rotation of the rotational drive shaft to the feed screw shaft member only in one direction.

Abstract: In a cutting machine having a spindle drive motor, a die head which holds at least one cutting tool, and an automatic tool retracting means on the die head for detecting the completion of the cutting operation of a pipe to be cut by the cutting tool to automatically retract the cutting tool to its inoperative position, an automatic operation stopping apparatus including a detecting unit for detecting the operation of the automatic tool retracting unit and a switch for automatically breaking the electrical connection of the spindle drive motor in response to the detection by the detecting unit.

Abstract: A metal saw cutter has a first motor for rotating a workpiece to be cut and a second motor for rotating a metal saw independently of the first motor.A control apparatus of the metal saw cutter has a detector for detecting variations in an electrical output depending on the variation of the cutting resistance acting on the metal saw during cutting, and a controller for controlling the speed of the second drive in accordance with the detection signal from the detector.

Abstract: A pipe cutter comprising a guide member, a pair of supporting arms which are slidably arranged on the guide member, rotatable supporting rollers which hold a pipe to be cut on at least three points of the peripery thereof, a sliding member having a cutting tool fixed thereto, which is mounted on one of the supporting arms, and a feed screw shaft provided with a handle and screwed to the sliding member, wherein by turning the feed screw shaft, the sliding member and cutting tool can be moved in a predetermined direction, the improvement comprising a frictional clutch which is interposed between said handle and said feed screw shaft so that rotation of the handle is transmitted to the feed screw shaft only when the cutting resistance acting on the side of the feed screw shaft is smaller than a predetermined value.

Abstract: A scroll chuck device comprising an annular body, a ring plate which is rotatably fitted in the annular body and which has scroll grooves, jaw holders on the ring plate which have clamping jaws and which are engaged in the corresponding scroll grooves so that the relative rotational movement between the ring plate and the jaw holders causes the latter to radially move, and clutch means between the annular body and the ring plate.

Abstract: A die-head of a cutting machine having a pair of relatively rotatable annular plates which retractably hold therebetween cutting tools extending in radial directions, one of the plates being provided with a tool retracting lever which is pivotably mounted thereto and which is directly engaged by a projection provided on the other plate, the lever being pivotally moved by a workpiece which extends axially in the plates.

Abstract: A die-head of a cutting machine having a pair of relatively rotatable annular plates which retractably hold therebetween cutting tools extending in radial directions, one of the plates being provided with a tool retracting lever which is pivotably mounted thereto and which is engaged by a slide which is slidably arranged on one plate and which tends to rotate together with the other plate by a spring force, the slide being slide to cause relative rotation between the two plates when the lever is pivotally moved by a workpiece which extends axially in the plates.

Abstract: A machine tool for machining a blank, such as round bar, comprising an electric motor which includes a motor housing having an axial bore through which the blank can extend, an annular stator arranged in said motor housing, and an annular rotor arranged in and coaxially to the annular stator, a chucking device for clamping the blank which extends through the axial bore and the annular rotor, and at least one cutting tool for machining the blank, one of the chucking device and the cutting tool being mechanically and immovably connected to the motor housing and the other being mechanically and rotatably connected to the annular rotor.

Abstract: A pipe cutter comprising a pair of support arms which can move away from and come near one another along and on guide means, said support arms being provided with opposed pipe holding means having rotating support rollers to rotatably hold a pipe to be cut, therebetween, at least one of the pipe holding means being provided with a tool bit which can move in radial directions of the pipe, independently of the movement of the pipe holding means.

Abstract: A cutting device for pipes comprising an adjustable frame body defining a substantially equilateral polygon having a center opening through which a pipe to be cut extends, and a ring gear which is supported by the frame body and which carries at least one cutting tool radially projecting therefrom, such ring gear being capable of effecting a rotational movement for cutting the pipe.