Abstract: A fluid control valve system for controlling the flow of hydraulic fluid supplied to and discharged out of an actuator having first and second actuator ports, comprising: a valve housing having a pressure sensing chamber for sensing the pressure of the hydraulic fluid introduced therein and a pressure port for introducing a hydraulic fluid; a valve spool axially movably received in the valve housing; valve spool operating means having the valve spool axially moved and including a force motor, a piston rod having the valve spool slidably received thereon and driven by the force motor, and a fixed piston firmly connected with the piston rod; and resiliently urging means for resiliently urging the valve spool along the center axis of the valve housing, the valve spool being urged by the hydraulic pressure of the hydraulic fluid in the pressure sensing chamber and the resiliently urging means to assume operation positions consisting of normal operation positions where the hydraulic pressure of the hydraulic fluid

Abstract: A method of magneto-optically modulating light comprises the steps of linearly polarizing the light on its transmission path, and placing a magneto-optic effect element on the transmission path of the polarized light with the spontaneous magnetization direction of the magneto-optic effect element being substantially parallel with the transmission path. The plane of polarization of the polarized light is rotated about the transmission path in the absence of the magnetic field applied to the magneto-optic effect element having the polarized light pass therethrough. The method further comprises the step of applying the magnetic field to the magneto-optic effect element with its internal magnetization being oriented in a direction perpendicular to the transmission path. The plane of polarization of the polarized light is maintained in its initial state in the presence of the magnetic field applied to the magneto-optic effect element having the polarized light pass therethrough.

Abstract: A hydraulic system for retracting into and extending out of the body of an aircraft a landing gear for use in taking off and landing, comprises a housing unit which has a hydraulic pump, a hydraulic actuator, a shuttle valve, an emergency valve, an actuator pressure releasing mechanism, and a mechanically locking mechanism accommodated therein. The hydraulic actuator has a piston rod assembly received therein to be reciprocably moved by the hydraulic pump to assume a retraction position and an extended position. The shuttle valve is movable with respect to the housing unit for selectively changing the flow of the hydraulic fluid between the hydraulic pump and the hydraulic actuator. The emergency valve is movable with respect to the housing unit to assume two different positions for selectively changing the flow of the hydraulic fluid between the hydraulic pump and the hydraulic actuator and the flow of the hydraulic pump and the fluid pressure reservoir.

Abstract: A vibration generating device is provided. Where a bucket link is replaced by the vibration generating device, the vibration generating device is connected to a main operating valve by conduits. Since both flow rate control valve and fluid motor are housed within a casing, a high pressure conduit for connecting the vibration generating device and main operating valve is not necessitated, thereby making the structure compact, and making the working of conduit arrangement easy and improve reliability. The center axial line of the cylinder chamber, rotary axial line of the valve element of the rotary valve and center axial line of the valve element of the flow rate valve are made parallel to one another so that these cylinder chamber, rotary valve and flow rate control valve are arranged in a superposing fashion, thereby making the entire vibration generating device compact.

Abstract: A yarn package forming machine for winding a yarn on a bobbin to form a yarn package on the bobbin, comprising: a stationary frame structure; a pair of supporting arms, rocking means, a pair of bobbin holders, a friction roller, yarn traversing means, yarn releasing means, and yarn end forming means. The yarn end forming means comprises a yarn transferring member, a yarn retaining unit and a yarn cutting unit to form a yarn end portion including a first trailing yarn end portion trailing to a bunch winding portion formed by the yarn releasing means to be wound on the full yarn package at a predetermined angle with respect to the axis of the bobbin, and a second trailing yarn end portion to be wound axially outwardly of the full yarn package on the bobbin.

Abstract: A resin composition for three-dimensional object by optical stereolithography containing a colorant, such as carbon black, in an amount of 0.05 to 0.5% by weight can provide a colored three-dimensional object which has excellent physical and mechanical properties such as dimensional accuracy, shape stability, hardness and tensile strength and elastic modulus in tension, as well as light-shielding properties, gives a massive impression and is colorful at a high optical shaping speed and in a good productivity.

Abstract: An eccentric orbiting type planetary gear device includes a bearing which requires no pre-load adjustment. The planetary gear device is small in the number of components when compared with the conventional device, and is improved in performance and in assembling efficiency. In manufacturing an eccentric orbiting type planetary gear device in which a supporting block (31) is made up of a supporting member (32) having a plurality of pillar-like portions (32a), and a disk (33), the supporting member and the disk being fastened to each other with fastening members (35) with an external gear (21) between the supporting member and the disk in such a manner the external gear is engaged with an internal gear; the supporting member and the disk are abutted against each other through end faces thereof, and are fastened to each other to form the supporting block, and bearing rolling surfaces (32b) and (33a) corresponding to inner races are formed in the supporting member and the disk at a predetermined interval.

Abstract: A false twisting device with three spindles and a plurality of friction discs wherein it is driven by means of individual motor so as to decrease generation of noise, adjustment of false twisting condition can be done for individual work stations, and maintenance service or replacement of spindles of the friction false twisting device can be done easily.

Abstract: A mold having a cavity for shaping a three-dimensional object, which comprises a photocured resin of a photocurable resin composition comprising(A) a liquid photocurable resin, and(B) at least one reinforcing agent selected from the group consisting of inorganic solid particles having an average particle diameter of 3 to 70 .mu.m and a whisker having an average diameter of 0.3 to 1.0 .mu.m, a length of 10 to 70 .mu.m and an aspect ratio of 10 to 100 and optionally, in which the inner surface of the cavity is covered by a solid film having a thickness of 5 to 1000 .mu.m.

Abstract: Photocurable resin compositions capable of producing plastic molds with improved durability by stereolithography in the presence of a photoinitiator includes unsaturated urethane of a specified kind, vinyl monomer of a specified kind, a filler and salt of phosphoric acid ester of specified kinds at a specified ratio.

Abstract: In a transmission gear for transmitting two rotary motions from a driving mechanism to a working mechanism, the transmission gear comprises a cylindrical support member, a flexible cylindrical member fixedly supported by the cylindrical support member, first and second input shaft members, and first and second output shaft members. The first and second input shaft members have non-circular peripheral portions, respectively. The first and second output shaft members have internal circular portions radially opposite to and spaced apart from the non-circular peripheral portions of the first and second input shaft members, respectively. The flexible cylindrical member interposes between the non-circular peripheral portions of the first and second input shaft members and the internal circular portions of the first and second output shaft members.

Abstract: A resin composition for stereolithography and a process for producing a three-dimensional object using the same. The resin composition comprises (1) a liquid photohardenable resin composition containing at least one of photo-polymerizable compounds and a photosensitive polymerization initiator, and (2) at least one of radiation energy absorbers in an amount of from 0.001 to 1.0% by weight based on the total amount of the liquid photohardenable resin composition (1).

Abstract: A self holding type connecting device comprising an armature which is disposed movably in an axial direction, a magnetic path member having a cross section formed along a closed loop and having an axial space wherein axial movement of the armature is permitted, a permanent magnet secured to the magnetic path member and forming two kinds of magnetic flux which pass through the armature and the magnetic path member, an electric magnetic coil which forms magnetic flux for moving the armature in an axial direction against the two kinds of magnetic flux, and switch for switching direction of the magnetic flux from the electric magnetic coil. In the device, decrease of connecting force due to abrasion of pads does not occur and power consumption can be remarkably reduced.

Abstract: Herein disclosed is a motion transforming apparatus, comprising first and second rotation shafts each formed with crank shaft portions, a plate assembly constituted by rotation plates each formed with teeth and cranked through bores respectively having the crank shaft portions of the rotation shafts received therein, a toothed rail having teeth, and a plate assembly housing relatively movable along the toothed rail, wherein the first rotation shaft is driven to rotate the rotation plates, and each of the rotation plates has an untoothed portion connected to the toothed portion of each rotation plate to be spaced from the toothed portion of the toothed rail and to have the toothed portions of the rotation plates closer to the second rotation shaft than the first rotation shaft.

Abstract: A linear motion apparatus is comprised of: a toothed rail (40); a linearly driving mechanism section (50) having a plurality of swinging plates (53), crankshafts (54, 55), and a casing (51); and guiding means for guiding the casing (51) relatively movably with respect to the toothed rail (40). The casing (51) includes: a pair of side portions (61, 62) which are guided by the guiding means on both sides, in a tooth width direction, of the rail (40); a pair of end plate portions (63, 64) which are located on opposite sides, as viewed in a longitudinal direction of the rail (40), of the swinging plates (53) and connect opposite end portions of the pair of side plate portions (61, 62); and a coupling member (521) which is located between the plurality of crankshafts (54, 55) as viewed in the longitudinal direction of the rail and couple intermediate portions of the pair of side plate portions (61, 62). The coupling member (521) is preferably passed through the swinging plates (53).

Abstract: A plastic mold is produced by first repeating the process of forming a layer of a photocurable resin composition of a specified kind and exposing it to actinic radiation to at least partially photocure it to produce a photocured layered structure having a glass transition temperature of 70.degree.-120.degree. C. This structure is then subjected to a post-cure process at a temperature high than the glass transition temperature by 30.degree.-100.degree. C. Plastic molds made by this method have superior heat distortion temperature and tensile elastic modulus.

Abstract: The invention relates to an eccentric orbiting type planetary gear device which requires no pre-load adjustment for the bearing, and is small in the number of components when compared with the conventional device, and is improved in performance and in assembling efficiency, and a method of manufacturing the device.

Abstract: A yarn heating apparatus, interposed between a false twist apparatus imparting twist to a synthetic fiber yarn and a yarn feed apparatus feeding the synthetic fiber yarn to the false twist apparatus, is designed to heat the synthetic fiber yarn traveling on a yarn travel path extending from the yarn feed apparatus to the false twist apparatus. The yarn travel path includes a twist existence path section through which the twist imparted to the synthetic fiber yarn extends continuously. The yarn heating apparatus comprises a yarn heat member unit formed with a yarn heat channel defining in part the twist existence path section of the yarn travel path for heating the synthetic fiber yarn passing through the yarn heat channel, and a plurality of yarn guide members located in the yarn heat channel of the yarn heat member unit in spaced relationship to one another for guiding the synthetic fiber yarn through the yarn heat channel of the yarn heat member unit.

Abstract: A motion transforming mechanism comprises a plate assembly constituted by rotation plates having a common rotation axis, a toothed rail having a parallel rail portion and a mid-longitudinal plane perpendicularly intersected by the common rotation axis and held in mesh with the rotation plates, a housing for housing the plate assembly and the toothed rail, and a rotation shaft supported by the housing and formed with cranked shaft portions respectively received in the rotation plates. The motion transforming mechanism further comprises distance regulating means for regulating the distance between the common rotation axis and the toothed rail. The toothed rail is formed with a toothed portion having a pitch plane perpendicularly intersected by the mid-longitudinal plane and a base portion integrally formed with the toothed portion and having a parallel rail portion in parallel with the mid-longitudinal plane and the pitch plane of the toothed rail.

Abstract: A resin composition for production of a three-dimensional object by curing, which comprises a) a liquid photocurable resin, and b) a reinforcing agent selected from an inorganic solid particle having an average particle diameter of 3 to 70 .mu.m, whisker having an average particle diameter of 0.3 to 1.0 .mu.m, a length of 10 to 70 .mu.m and an aspect ratio of 10 to 100, and a combination of these.