Abstract: A blank-figure constructing method for sheet metal work, wherein a cutting passage planned to sequentially cut a plurality of desired blanks from a sheet material is determined, utilizing a multiple figure composed of the figures of the plurality of blanks to be obtained, in the multiple figure of which the adjacent line segments of the single blank figures are combined. This method is that if the multiple figure has an even number of, four or more odd vertices at each of which an odd number of internal and external line segments of the multiple figure meet, an auxiliary line is drawn outside the multiple figure, connecting any two of the odd vertices on the outline of the multiple figure to make the total number of odd vertices be two or zero so that the cutting passage, which passes through all the internal, external line segments and auxiliary line of the multiple figure, can be determined.

Abstract: There is provided a displacement control system for a variable displacement hydraulic pump which has a displacement control piston assembly (6) having a large diameter chamber (7) for operating a displacement control member (5) of the variable displacement hydraulic pump selectively in a direction of smaller displacement and in a direction of larger displacement, first control valve (8) and second control valve (9) for selectively communicating the large diameter chamber of the displacement control piston assembly with a pump discharge line and a tank, the first control valve being placed at a supply position by the pump discharge pressure, and at a drain position by a spring associated with the displacement control piston assembly via a feedback lever, and the second control valve being placed at a first position by the pump discharge pressure for communicating the pump port and the large diameter chamber and at a second position by a load pressure for communicating the pump port and the large diameter chamb

Abstract: An apparatus for detecting an amount of metal powder in a hydraulic circuit for supplying a drain pressurized oil from a hydraulic pump driven by an engine is characterized by comprising a metal powder amount detection sensor (9) disposed in a flow passage of the pressurized oil and adapted to transmit a signal in proportion to an adhering amount of the metal powder and a controller (11) for calculating the metal powder amount from the signal outputted from the metal powder detection sensor and displaying the calculated amount.

Abstract: The present invention relates to a plasma cutting method and an NC plasma cutting apparatus in which an improvement can be made in the quality of a bore-cut product obtained by using a transferred plasma arc, and the productive efficiency can also be enhanced. In order to achieve the above-described advantages, the transferred plasma arc is switched to a non-transferred plasma arc at a position immediately before a cutting finishing point and in the vicinity of a position at which cutting lines cross each other. Simultaneously with this switching operation, the moving speed of the plasma torch is varied in accordance with a change in the plasma arc current. Additionally, the transferred plasma arc current is reduced at a position immediately before the cutting finishing point and in the vicinity of a position at which cutting lines cross each other. The moving speed of the plasma torch can be varied in accordance with the reduction in the arc current.

Abstract: A control system designed such that if a heavy load is imposed on a vehicle during running and a hydraulic relief state in which an oil pressure in a hydraulic circuit for a hydrostatic transmission unit exceeds a relief pressure is detected, the angle of a discharge controlling swash plate for a pump is reduced to a specified value (e.g., 50% of the maximum angle) or less, whereby the stall of the vehicle and the overheat of machine parts are prevented.

Abstract: An unstacking feeder capable of unstacking sheet materials efficiently from a sheet stack has a sheet stack transfer device (3) for transferring a sheet stack, which consists of a plurality of stacked sheet materials (1a), along a circulating transport configuration extending across a predetermined unstacking position (A). In order to separate individual sheet materials from a sheet stack in order, a floater (6) is selected and supplied automatically in accordance with the configuration of the sheet materials by a floater supply mechanism (5, 7, 7d). Each unstacked sheet material is transferred to equipment in the subsequent stage, such as a transfer feeder by sheet material transporting arrangements (11, 19). During this period, each sheet material (1a) separated by the floater (6) is transferred onto a sheet material transporting arrangement by a sheet material transfer device (9).

Abstract: A response control system for a hydrostatic-mechanical transmission. In this system, it is determined in digging/moving operation whether an actual speed ratio which is the ratio of the revolution speed of the output shaft to the revolution speed of the power source is equal to a specified value or less, and if so, a target speed ratio which is a target value for the ratio of the revolution speed of the output shaft to the revolution speed of the power source is set, limiting the amount of change in the target speed ratio per unit time. Based on the target speed ratio thus set, the angle of at least either of discharge controlling swash plates is controlled, thereby reducing vehicle acceleration at the primary stage of digging. In order to slow down the response to a change in load during digging operation, a constant indicating the response to a change in engine revolution is set small in proximity to a target engine revolution speed.

Abstract: An operating valve assembly incorporates a pressure compensation valve and is capable of contributing down-sizing of a hydraulic circuit. The valve assembly includes an operating valve, compensation valves and a load pressure detecting portion. A valve body of the operating valve defines a spool bore extending laterally through the valve body at a vertically intermediate portion of the valve body, a load pressure detecting port at a laterally intermediate portion of the spool bore, and a respective pump port, actuator port and tank port at each side of the load pressure detecting port. The operating valve also includes a spool within the spool bore. The pressure compensation valves are arranged at left and right sides of an upper portion of the valve body and the load pressure detecting portion, for supplying load pressure to the load pressure detecting port, is formed in the spool.

Abstract: In bending angle detection, a linear projected light image formed on the surface of a workpiece is photographed by a photographing device; the actual inclination angle of a specimen is stored as data in correspondence with the inclination angle and position of the specimen in an image; and the bending angle of the workpiece is obtained by accessing the data, with the inclination angle and position of the linear projected light image in an image produced by photographing. In main straight line extraction, main pixels are obtained from the distribution of the brightness of pixels aligned on specified axes and a main straight line is obtained from a plurality of main pixels. For extracting only a necessary straight line from an image including unnecessary straight lines, the photographing device is so disposed as to photograph a lower bender and a second straight line from the bottom end of the image is extracted.

Abstract: In a die cushion pin pressure equalizing system wherein a plurality of die cushion pins are vertically movably provided in a bolster of a press machine, pressure equalizing hydraulic cylinders supported by die cushions are respectively provided downwardly of the plurality of die cushion pins and the plurality of pressure equalizing hydraulic cylinders are connected to one another through hydraulic paths, so that oil pressure is applied to the pressure equalizing hydraulic cylinders and the hydraulic paths, preload oil pressure acting on the plurality of pressure equalizing cylinders is raised to thereby prevent the plungers from bottoming.

Abstract: A confocal optical apparatus comprising a light source, a first aperture portion for passing light emitted from the light source and obtaining a point source, an objective lens for causing the light that has passed through the first aperture portion to converge on a measurement object, a second aperture portion located on a plane conjugate with the convergence surface on the measurement object, and light detectors for detecting light that has passed through the second aperture portion, wherein placing the first and second aperture portions in the same position and using them as the same aperture portion, as well as positioning the detection surfaces of the light detectors substantially on the same surfaces as the conjointly used identical aperture portions make it possible to reduce the size and weight of the apparatus, to perform three-dimensional shape measurements rapidly and accurately, and to facilitate the alignment of each portion.

Abstract: A direction control valve is formed by providing a main spool for establishing and blocking communication between an inlet port, first and second actuator ports and first and second tank ports. A pressure compensation valve comprising a check valve portion and pressure reduction portion is provided for compensating the pressurized fluid with a load pressure and supplying it to the inlet port. A plurality of valve blocks are connected to each other with respective first and second tank ports and respective pump ports in fluid communication. A pump port of one of the valve blocks is connected to a main inlet port, and a tank port of one of the valve blocks is connected to a main tank port. Thus, a hydraulic circuit for distributing a pressurized fluid from a single hydraulic pump to a plurality of actuators is provided.

Abstract: In bending angle detection, a linear projected light image formed on the surface of a workpiece is photographed by a photographing device; the actual inclination angle of a specimen is stored as data in correspondence with the inclination angle and position of the specimen in an image; and the bending angle of the workpiece is obtained by accessing the data, with the inclination angle and position of the linear projected light image in an image produced by photographing. In main straight line extraction, main pixels are obtained from the distribution of the brightness of pixels aligned on specified axes and a main straight line is obtained from a plurality of main pixels. For extracting only a necessary straight line from an image including unnecessary straight lines, the photographing device is so disposed as to photograph a lower bender and a second straight line from the bottom end of the image is extracted.

Abstract: A transfer feeder which comprises: a pair of lifting beams (9) which are so disposed as being parallel to each other and extending in a workpiece conveying direction; a lifting mechanism (10) for driving the said pair of the lifting beams in upward and downward directions; a plurality of pairs of cross bar carriers (15) which are so arranged on the said pair of the lifting beams as to be spaced apart from, and connected with, one another and be displaceable in the said workpiece conveying direction; a cross bar (16) that is transversely bridged across a said pair of those cross bar carriers as afore-said which are juxtaposed with each other, and that has a workpiece attracting means (19) attached thereto; and a feed mechanism (22) for driving the said cross bar carriers in a feed direction, the said transfer feeder being characterized in that at least the said lifting mechanism is provided with its drive source that is constituted by a servo-motor (11).

Abstract: A work transferring apparatus for a thermal cutting machine is used for processing a workpiece placed on a worktable moving freely along an X axis direction by means of a work head moving freely along a Y axis direction crossing the X axis direction. The apparatus includes a chain conveyor mounted at an upper portion of the worktable for transferring the workpiece in and out, a body having a plurality of roller conveyors for transferring the workpiece to the chain conveyor, and a separating mechanism mounted between the chain conveyor of the worktable and the roller conveyor of the body for separating the workpiece after it is processed into a product and scrap. The body is arranged in a vicinity of the worktable, and the workpiece is set freely on the roller conveyor of the body.

Abstract: A crankshaft miller includes a pair of work heads for supporting both ends of a work, a cutter unit for processing the work and a work rest for supporting the work during processing. The cutter unit and the work rest are provided separately, but are coupled by a separable link mechanism for moving the work rest together with the cutter unit as necessary. A method of use of a crankshaft miller includes the steps of providing a pair of movable work heads for supporting both ends of the work, a cutter unit for processing the work and the work rest for supporting the work during processing. The cutter unit and the work rest are provided separately, but coupled by a separable link mechanism so that the work rest can be moved together with the cutter unit as necessary.

Abstract: Aimed at preventing a laser light beam profile from fluctuating, and by using the fact that there is a substantially proportional relation between the beam profile and the charging voltage as well as between the beam profile and the composition or the total pressure of the laser gases, an excimer laser device comprises a laser chamber containing laser gases which are excited by initiating an electric discharge in the laser chamber to output laser light, a beam profile detector for detecting a beam profile of the output laser light, and a controller for controlling a electric discharge voltage (excitation intensity) and composition or total pressure of the prescribed types of laser gases in such a way that the beam profile is shaped as desired based on detection results of the beam profile detector.

Abstract: A blade device, wherein the angling angle of a blade can be increased and the blade width at the maximum angling is smaller than the chassis width without setting the mount position of the blade too far from a chassis. The connecting position of a joint for connecting a frame and a blade deviates from the crosswise center X--X of a chassis; and an actuator for pivotally moving the blade forward or backward is attached to the frame. As such, good workability of the blade device and good transportability of an earth-moving machine to which the blade device is operably coupled can be obtained.

Abstract: A temperature and humidity adjusting apparatus has an air cooling and dehumidifying device, an air heater and a humidifier arranged in order. The air cooling and dehumidifying device includes thermoelements that use the Peltier effect. The humidifier includes hollow yarn bodies, each of which are formed by winding metal wire that serves as a heater on the outer periphery of a hollow yarn that is formed into hollow construction from heat resistant fiber. The humidifier also includes means for supplying water to each of the hollow yarn bodies and a power supply that supplies power to the metal wire.

Abstract: An operating valve assembly with an electromagnetic proportioning pressure reduction valve comprises an operating valve constructed by slidably disposing a spool in a spool bore opening to an end face of a valve body, mounting a spring case including a case body having a blind bore and a housing having a spool bore for a pressure reduction valve on the end face in a manner such that the spool bore and the blind bore are matched to each other, and defining a pressure receiving chamber between the interior wall of the blind bore of the spring case and the end portion of the spool, and the electromagnetic proportioning pressure reduction valve constructed by disposing a spool for the pressure reduction valve in the spool bore for the pressure reduction valve, and mounting a solenoid for driving the spool for the pressure reduction valve on the housing, and an output port of the electromagnetic proportioning pressure reduction valve is communicated with the pressure receiving chamber.