Abstract: An absolute position detecting device in which the number of revolutions of a drive shaft adapted to drive an object to be controlled is counted with a counter for detecting an absolute position of the object. When a predetermined point on the object returns to an initial position after making one or more revolutions, the drive shaft is returned to an initial rotational angular position. A data rewriting operation is performed to rewrite, as necessary, the count value of the counter into a value obtained by subtracting a count value therefrom which is obtained during the one or more revolutions of the predetermined point.

Abstract: A counterbalance valve including a spool (62) divided into two spool pieces (63, 64) at its axial center, return springs (71, 72) for urging the spool pieces inwardly along the axial direction toward their innermost positions, a first passage (90) for introducing an inside pressure in a supply and exhaust passage (48) to an outermost end of the spool piece (63), a second passage (91) for introducing an inside pressure in the supply and exhaust passage (49) to an outermost end of the spool piece (64), a pressure selecting member (88) for selecting higher inside pressure among the inside pressures in the supply and exhaust passages (48, 49) and for introducing the selected pressure via a choke (87) to a pressure chamber (73) formed between the spool pieces (63, 64), and a communicating passage (95) formed for communicating the supply and exhaust passages (48, 49) with each other when both the spool pieces (63, 64) are moved outwardly in the axial direction from the innermost positions due to fluid in the pressu

Abstract: A screw fastening device comprising a casing, a motor connected to the casing, a block body rotatably housed in the casing and having a pair of axially spaced plate portions, a plurality of torque transmitting pins each rotatably supported on the plate portions of the block body, the pins having eccentric cam portions, respectively, and being rotated by the motor, an externally toothed gear formed with engagement portions engaged by the eccentric cam portions of the torque transmitting pins, an internally toothed gear fixedly mounted in an inner periphery of the casing so that it can engage with the externally toothed gear, the internally toothed gear being slightly different in number of teeth from the externally toothed gear, and a rotational output shaft connected to either one of the plate portions of the block body.

Abstract: A fluid control apparatus which communicates a fluid cylinder with a fluid supply passage and a return passage, and a piston of the fluid cylinder is connected to a spoiler of an airplane.The fluid control apparatus comprises a hydraulic passage and a check valve. The hydraulic passage is capable of communicating with cylinder chambers located at both sides of the piston. The check valve is opened by hydraulic pressure generated by backward movement of the piston.The fluid control apparatus has a blow down valve characteristic so that the piston is allowed to move only in one direction by an external force when supply of fluid to the actuator is stopped because at least one of the supply passage and the return passage is damaged.The fluid control apparatus further has a retainer and a manually operable member.The retainer communicates the return passage with the hydraulic passage capable of communicating with cylinder chambers of the actuator.

Abstract: A tool-rest driving device comprising a drive motor having its output shaft, a first rotatable shaft axially aligned with the motor output shaft and driven to rotate by the motor output shaft, a tool rest having at least one rotational tool, a reduction gear arranged between the first rotatable shaft and the tool rest for reducing the number of rotations of the motor output shaft, the tool rest being rotated at the reduced number of rotations, and a second rotatable shaft arranged coaxially of the motor output shaft for driving the rotational tool of the tool rest. A center axis of the rotational shaft, a center axis of the reduction gear and an axis of rotation of the tool rest are arranged on the same axis.

Abstract: An apparatus for traversing a yarn along a bobbin, with which a contact roller contacts. The traversing apparatus is disposed below a fulcrum for traverse motion and comprises:a frame downwardly inclined relative to the moving direction of the yarn;spindles rotatably supported on the frame at apexes of a rectangle;first traverse blades, spaced downwardly from the fulcrum for traverse motion by a predetermined distance and secured to the spindles located remotely from the yarn, for traversing the yarn from ends of traverse stroke toward a center of the traverse stroke; andsecond traverse blades, spaced downwardly from the first traverse blades by a predetermined distance and secured to the spindles located closer to the yarn relative to the remote spindles, for traversing the yarn, which has been transferred from the first traverse means, from the center of traverse stroke towards the ends of traverse stroke.

Abstract: A motion converting mechanism comprising a feed member provided with a screwed portion, a screw nut member engaging with the screwed portion of the feed member, a support member rotatably supporting the feed member and the screw nut member, a single drive unit for imparting a rotational motion to the feed member, and a braking unit for braking the rotational motion imparted to the screw nut member so the feed member is given a linear motion.

Abstract: In a yarn winding apparatus which comprises a bobbin holder for holding a yarn winding bobbin and a contact roller pressed against the bobbin held by the bobbin holder or a package wound onto the bobbin and by which the yarn is continuously wound, the winding apparatus further comprises a rotating speed detector for detecting a rotating speed of the contact roller and a tension detector for detecting a tension in the yarn, and rotation of a motor for driving the bobbin holder is controlled based on information comprising data detected by the rotating speed detector and data detected by the tension detector so that the winding speed is adjusted to a predetermined value.

Abstract: An apparatus for heat treating a synthetic yarn comprises a heater body for completely or partially encircling the synthetic yarn, which is being false twisted or being drawn and false twisted, in a condition non-contacting therewith, a heating member disposed in the heater body for heating the heating wall of the heater body at a high temperature, and yarn guides disposed in a yarn passage surrounded by the heating wall of the heater body. In a first embodiment, the heater body and the heating member are longitudinally divided into at least two sections. In a second embodiment, the yarn guides are provided with yarn guide heating members which are different from the heating member for heater body.

Abstract: A flutter control system of an aircraft wing comprising an actuator mounted on the aircraft wing to control a control surface, flight control command unit for outputting an actuation command signal for actuating the actuator, wing-displacement measurement unit for measuring an actual displacement of a predetermined point on the wing and outputting an actual displacement signal corresponding to the measured actual displacement, normal-wing-displacement prediction unit for predicting a normal displacement of the wing during normal flight in which no disturbance occurs, on the basis of the actuation command signal and of an information signal representing information about atmospheric density, flight speed and actuation position of the actuator and for outputting a predicted normal displacement signal representing the predicted displacement during the normal flight, disturbance-component estimation unit for receiving the actual displacement signal and the predicted normal displacement signal and for outputting a

Abstract: An actuator for transducing a rotational movement into a linear movement, which comprises:a drive motor generating the rotational movement;a first input gear connected to an output shaft of the drive motor;a first output gear engaging with the first input gear at a first gear ratio and having an external thread portion;a second output gear engaging with a second input gear at a second gear ratio and having an inner thread portion meshing with the external thread portion;an output member connected to the second output gear and generating the linear movement; andthe first and second gear ratios being different from each other.

Abstract: In a stability compensating circuit of an actuator system which has an actuator that is actuated in response to an input signal and has an object to be controlled by the actuator and includes a vibrational component and wherein the stability of the actuator system is compensated by controlling a deviation signal between the input signal to the actuator and a feedback signal from the actuator, the improvement comprising a moving average filter for averaging the deviation signals to the actuator at intervals of a moving average time of the filter.

Abstract: A yarn winding method, which is applicable to a yarn winding device, which is installed in a texturing machine, a draw texturing machine, or a spinning machine, wherein traverse stroke is varied pulsatively, the traverse stroke, number of traverse strokes and winding speed are controlled by separate drive motors which are independent from each other, varying period of the traverse stroke, varying period of the number of traverse strokes and the varying period of the winding speed are basically in synchronism with each other, and at each traverse period, at least one of start points of the varying period of the traverse stroke, of varying period of the number of traverse strokes and of varying period of the winding speed is shifted from the other by a distance within a range of between 0 and 30% of the basic varying period.

Abstract: A counterbalance valve with a relief function, disposed in a pair of supply and exhaust lines communicating a directional control valve with a fluid actuator for adjusting a flow area at an exhaust side of the supply and exhaust lines in response to a pressure at a supply side of the supply and exhaust lines, which includes two divided spools, corresponding to the supply and exhaust lines, respectively, as a spool of the counterbalance valve, a device for moving one of the divided spools at the supply side of the supply and exhaust lines in such a direction that the flow area increases in response to an increased pressure at the exhaust side of the supply and exhaust lines, when the pressure increases beyond a predetermined pressure due to a pumping function of the fluid actuator, and a communicating passage for communicating the exhaust side of the supply and exhaust lines with a supply side of the supply and exhaust lines when the moving device is actuated so that the fluid at the increased pressure at the

Abstract: An actuator including a cylinder having a longitudinal bore, a piston slidably and sealingly inserted into the cylinder, and a lock mechanism for temporarily locking the piston, the cylinder including a cylinder body having the longitudinal bore, a cylinder formed at a front end of the cylinder body and accommodating the lock mechanism, and a front wall connected to the cylinder head at a position opposite to the front end of the cylinder body and having a hole formed therein, the piston including a piston head slidably and sealingly inserted into the cylinder bore, the piston rod projecting from the piston head and slidably insertable into the hole of the front wall, a key groove formed on the piston rod at a position near the piston head, and a longitudinal hole formed within the piston head and the piston rod, wherein the diameter of the piston rod decreases from a backward position adjacent to the key groove to a forward position spaced from the piston head.

Abstract: A four way directional control valve comprises a valve body having a sleeve formed therein, a spool slidable in the sleeve, two output ports, a pump port and two tank ports formed in the valve body so that the output ports can be a pressure side and an exhaust side by operation of the spool. The four way directional valve further comprises a communicating passage formed in the valve body to provide communication of the output ports with each other, a fixed orifice disposed in the communicating passage, a control passage, formed in parallel with the communicating passage, a control spool disposed in the control passage movable in response to a differential pressure between the output ports to block the communicating passage.

Abstract: First and second traverse devices comprising rotary blades are overlapped, and the first traverse device conveys a yarn to a traverse end, and the second traverse device receives the yarn from one of rotary blades of the first traverse device and engages it with another rotary blade of the first traverse device.

Abstract: A bobbin holder comprises a rotatable support member, a plurality of bobbin holding devices inserted onto the rotatable support member, and at least one cylindrical member inserted onto the rotatable support member and engaging with the bobbin holding device, so that bobbin holding devices are expanded so as to hold bobbins. A main compression member for radically expanding the bobbin holding devices is disposed at one end of the bobbin holder. At least one supplementary compression member for supplementing expansion force of the main compression member is disposed at an intermediate portion between a bobbin holding device located at the end where the main compression member is disposed and another bobbin holding device located at an opposite end.

Abstract: A robot arm drive apparatus of an industrial robot comprising: an electric motor having a drive shaft; a first robot member having the electric motor mounted thereon; a second robot member rotatably supported on the first robot member; and reduction gears for reducing rotation of the electric motor and then transmitting to the second robot member; the reduction gears comprising a planetary reduction gear and furthermore an additional reduction gear which is purposely provided so that the number of rotations of the electric motor, at which the resonance of a drive system comprising the electric motor, the second robot member and the reduction gear means occurs, is shifted from a predetermined operational region of the electric motor.

Abstract: A four way directional control valve comprises a valve body having a sleeve formed therein, a spool slidable in the sleeve, two output ports, two pump ports and a tank port formed in the valve body so that the output ports can be a pressure side and an exhaust side by operation of the spool. The four way directional valve further comprises a communicating passage formed in the valve body to provide communication of the output ports with each other, a fixed orifice disposed in the communicating passage, a control passage, formed in parallel with the communicating passage, a control spool disposed in the control passage movable in response to a differential pressure between the output ports to block the communicating passage.