Abstract: A fluid rotating apparatus according to the present invention is designed to promptly achieve an extremely high degree of vacuum from promptly atmospheric pressure promptly by its single apparatus. Moreover, high-speed synchronous rotation of the rotary shafts of the apparatus is controlled by use of a rotary position detecting sensor, to thereby avoid control mechanical contact thereof with a gear or the like. In addition, hydrostatic bearing are employed for supporting the rotary shafts to avoid of mechanical abrasion and the use of lubricant oil.

Abstract: A rotor shaft provided with a fan is rotatably supported by pneumatic bearings for the purpose of high speed rotation with low noise. The rotor shaft provided with the fan can also be supported at one end by a resilient bearing so as to provide high speed rotation even if the concentricity of the bearings is low.

Abstract: A dynamic pressure air bearing unit comprising a rotating shaft and a bearing member fitted around the rotating shaft, wherein a first spiral groove is disposed on a part of one of two cylindrical bearing surfaces facing each other, one being of the rotating shaft and the other of the bearing member, the first spiral groove acting to impel lubrication air between the cylindrical bearing surfaces toward the innermost portion of the bearing member with the rotation of the rotating shaft, and a second spiral groove is disposed on a portion of the cylindrical bearing surface adjacent to the open end of the bearing member, the second spiral groove acting to discharge, air toward the open end of the bearing member, an air conducting passage being provided to connect the boundary portion between the first and second grooves with the outside of the bearing unit, and the air passage having a filter installed at the open end thereof, thereby providing a dynamic pressure air bearing unit capable of operating in an envir

Abstract: In a bearing unit using a hydrodynamic lubrication film (5 or 25) of a lubrication fluid, a shaft (2 or 22) comprises plural spiral grooves (6a, 6b or 26) thereon, at least one circumference groove (7a, 7b or 27) thereon and an inner passage ((8+9+10) or (29+30)), which leads the fluid pumped by the spiral grooves (6a, 6b or 26) to the circumferential groove (7a, 7b or 27), therein, thereby to produce both functions of a kinetic pressure bearing and a static pressure bearing.

Abstract: In a variable capacity compressor having a capacity control mechanism so as to keep a suction pressure constant by detecting the suction pressure, plural return ports (18), a return passage (10) and an exit (19) are provided for bypassing refrigerant gas from a volume-decrease-step space in a cylinder compartment (5a) to a volume-increase-step space in that, and a guide passage (8) wherein a slider slides by a pressure of refrigerant gas is provided for controlling an amount of bypassing gas; and thereby it is possible to control capacity correctly and stably.

Abstract: A solid lubricant bearing comprises plural rollers disposed in a line or in a circle, plural solid lubricant elements at least one thereof contacting one of the rollers beings pressed by springs on the rollers, and a guiding base for receiving the rollers to roll thereon has a solid lubricant film formed on its roller receiving face.

Abstract: A fluid servomechanism has a first actuator driven by fluid, a second actuator, and a pressure generator for generating pressure corresponding to the difference in displacement between output shafts of the first and the second actuators. Therefore, a compact-size finger facilitating angularly free movement and having a highly elaborate human-like function can be attained.

Abstract: A hydraulic servo actuator has an outer case, a rotatable shaft extending through the case, an input sleeve rotatably mounted on the shaft and having hydraulic fluid supply and discharge passages therein and having surface grooves communicating with the passages, an output member on the shaft and movably abutting the input sleeve and having fluid supply and discharge passages therein and having surface grooves communicating with the passages and being opposed to corresponding grooves on the input sleeve, the outer casing and the output member defining an actuating chamber therebetween into which the passages in the output member open; the actuating chamber is shaped for causing the output member and the outer case to rotate relatively and rotate the shaft and case relatively when fluid supplied into the chamber from the passages under control of relatively rotation of the input and output members creates an unbalanced pressure on parts of the actuating chamber.

Abstract: A position sensing apparatus includes an ultrasonic wave transmit-receive element for transmitting and receiving ultrasonic waves to and from an object whose position is to be sensed and a manipulator for changing the relative positions between the object and the ultrasonic wave transmit-receive element, and a signal processor utilizing changes in the reflected signal intensity in the vicinity of the center of the object to be measured, thereby sensing the position of the object.

Abstract: A sliding vane type rotary compressor has at least two suction ports through which a refrigerant is sucked into the vane chamber. A combination of a spring made of a shape memory alloy adapted to expand and contract when supplied with an electric current and a spool operative by the spring is disposed in a flow passage through which the source of the refrigerant is connected to one of the suction ports leading to a region of higher magnitude of compression. The flow passage is opened and closed by the spool which is moved by the expansion and contraction of the spring of the shape memory alloy in response to the heat produced by the self heat build-up action when supplied with an electric current and also to the cooling function of the refrigerant of low temperature, thus attaining a variable capacity control of the compressor with a simple and compact construction.

Abstract: By utilizing a movable table (19), an electrical driver (21) attached to the table (19), a hole position detecting means (26) for detecting a hole position of the work roughly disposed beforehand, with using an ultrasonic element (53), the hole position can be detected precisely and a screw tightening can be executed exactly and automatically even when the hole position is so discrepant within predetermined area.

Abstract: A compressor of the present invention performs restraining action in refrigerative ability at high speed driving time utilizing suction loss that vane chamber pressure drops lower than supply source pressure of refrigerant, and comprises a rotor (14) having vanes provided slidably, a cylinder (11) receiving said rotor (14) and vanes (12), side plates fixed to both side faces of said cylinder (11) and closing tightly a space of vane chamber (18a), (18b) formed by said vanes (12), rotor (14) and cylinder (11) at its side faces, and at least more than two suction ports (15) and (17), whereby even in a compressor having many numbers of vane (12), such a compressor with ability control that having no loss in refrigerative ability at low speed, and refrigerative ability is restrained only at high speed driving can be realized.

Abstract: A rotary compressor which includes a rotor into which vanes are slidably provided, the rotor and vanes being rotatably mounted in a non-circular cylinder having side plates fixed to both sides thereof. The rotor, cylinder, and side plates define sealing spaces at respective ends of which are provided suction bores and discharge bores. Between the blades and also bounded by the rotor, side plates and cylinder are blade chambers which rotate with the rotor and vanes across the suction bores and discharge bores so that the pressure in the blade chambers during a suction stroke of the compressor utilizes a suction loss which is lower than the pressure of a refrigerant supply source to carry out suppression of the refrigerating capacity during high speed rotation of the rotor.

Abstract: A compressor includes a rotor with slidable vanes, a cylinder receiving the rotor and vanes and side plates fixed to opposite sides of the cylinder. A suction stream intercepting section is provided in the suction passage between adjacent vane chambers from the supply of refrigerant. The rotary compressor has no loss of refrigeration cooling ability at low speed operation and refrigeration cooling is restrained only at high speed operation.

Abstract: In a rotary head assembly for magnetic recording and reproducing apparatus such as VTR, fluid or hydraulic radial and thrust bearings are provided between a stationary sleeve whose one end is closed fluid-tightly and a rotary shaft rotatably extended into said stationary sleeve, whereby the rotary head assembly may be made compact in size and easy to assemble, may rotate with a higher degree of reliability and may completely seal lubricant.

Abstract: A sliding vane type rotary compressor, of which refrigerating capacity at the high speed operation of the compressor is suppressed by making use of suction loss involved when refrigerant pressure in the vane chamber becomes lower than the pressure of the refrigerant supply source in the suction stroke of the compressor. The compressor has a rotor, vanes slidably carried by the rotor, a cylinder accommodating the rotor and the vane, side plates fixed to both sides of the cylinder for closing both open ends of the vane chambers defined by the rotor, vanes and the cylinder, and suction and discharge ports serving as passages for communicating the vane chambers with the outside of the compressor. A spacer for adjustment of the refrigerating capacity is disposed in the suction port.

Abstract: A compressor adapted for capacity control includes a rotor mounting thereon vanes slidably, a cylinder receiving therein the rotor and the vanes, side plates secured to the opposite sides of the cylinder, a vane chamber defined by the vane, rotor and the cylinder and closed at its sides by the side plates, suction ports and a discharge port. Suction loss produced when the pressure within the vane chamber becomes below the pressure of the refrigerant supply source during a suction stroke is utilized for suppressing the refrigerating capacity of the compressor at high speed operation. With the arrangement of the compressor, the effective area of the flow passage leading to the vane chamber from the suction ports varies in at least two stages such that it becomes smaller in the latter half of the suction stroke than in the former half thereof. Thus, in the compressor, driving torque can be reduced at low speed operation and adequate effects of capacity control can be obtained at high speed operation.

Abstract: A pump for supplying kerosene to a combustion apparatus having means for giving a drive force for producing relative rotation between a housing and a shaft, at least one shallow groove formed in one of the surface of the shaft and the surface of the housing movable relative to the shaft surface, and an inlet bore and an outlet bore for the kerosene to be forced forward by the groove. The pump is characterized in that the groove has a depth ho defined by0.00558q.mu.<ho<250.mu.wherein q is the heat output of the combustion apparatus in kcal/h.

Abstract: A sliding vane type rotary compressor having a rotor, at least one vane slidably mounted on the rotor, a cylinder accomodating the rotor and the vane, and end plates fixed to both ends of the cylinder so as to close vane chambers defined by the vane, the rotor and the cylinder at both sides of the vane chamber. The improvement comprises that the compressor is constructed to meet the following condition:0.025<.theta..sub.s a/Vo<0.080where, a is a value given by the following equation of: ##EQU1## .theta. represents the angle (radian) formed around the center of rotation of the rotor between the end of the vane closer to the cylinder and the cylinder top where the distance between the inner peripheral surface of the cylinder and the outer peripheral surface of the rotor is smallest;.theta..sub.s represents the rotation angle .theta. (radian) at the instant of completion of the suction stroke;Vo represents the volume (cc) of the vane chamber when the rotation angle .theta. is .theta..sub.s ; anda(.theta.

Abstract: This invention relates to a compressor controllable in capacity, and more particularly to a compressor comprising a rotor having vanes slidably fitted thereto, a cylinder for receiving the rotor and vanes, side plates rigid on both sides of the cylinder and enclosing a space of a vane chamber defined by the vanes, rotor and cylinder at the sides thereof, and inlet and outlet ports each serving as a passage to communicate the vane chamber with the exterior, wherein the cylinder is oriented to have its top portion where a distance between the outer periphery of the rotor and the inner periphery of the cylinder becomes minimum. The improvement according to this invention is in that the inlet port is positioned so as to make a(.theta.) almost constant, or meet a(.theta.)=a, in a range of 1/2.theta..sub.s <.theta..ltoreq..theta..sub.s and parameters of the compressor are determined to meet the following relation;0.025<.theta..sub.s a/V.sub.o <0.080where,.theta.