Abstract: A composite valve includes a valve body, a first valve module, and a second valve module. The valve body includes a first body portion to which the first valve module is attached, a second body portion to which the second valve module is attached, a third body portion that has an input port, and a fourth body portion that has an output port and an attachment portion. The first body portion and the second body portion respectively extend along a first axis and a second axis that are parallel to each other. The third body portion extends along a third axis that is at 90 degrees with respect to the first axis and with respect to the second axis. The fourth body portion extends along a fourth axis L4 that is at 90 degrees with respect to all the first axis, the second axis, and the third axis.

Abstract: A composite valve includes a valve body, a first valve module, and a second valve module. The valve body includes a first body portion to which the first valve module is attached, a second body portion to which the second valve module is attached, a third body portion that has an input port, and a fourth body portion that has an output port and an attachment portion. The first body portion and the second body portion respectively extend along a first axis and a second axis that are parallel to each other. The third body portion extends along a third axis that is at 90 degrees with respect to the first axis and with respect to the second axis. The fourth body portion extends along a fourth axis L4 that is at 90 degrees with respect to all the first axis, the second axis, and the third axis.

Abstract: A pilot check valve includes: a fluid channel body; a moveable body that moves in an axial direction under effects of pilot pressure; a packing including a lip portion that is displaceable, integrally with the moveable body, between a valve close position and a valve open position; and a detector to detect position of the moveable body. The packing, in the valve close position, allows flow of an operating liquid from a first port side of the fluid channel body to a second port side and prevents the flow of the operating liquid from the second port side to the first port side, and in the valve open position, connects the first port and the second port.

Abstract: A pilot check valve includes: a fluid channel body; a moveable body that moves in an axial direction under effects of pilot pressure; a packing including a lip portion that is displaceable, integrally with the moveable body, between a valve close position and a valve open position; and a detector to detect position of the moveable body. The packing, in the valve close position, allows flow of an operating liquid from a first port side of the fluid channel body to a second port side and prevents the flow of the operating liquid from the second port side to the first port side, and in the valve open position, connects the first port and the second port.

Abstract: A positioning control system has a disturbance observer for estimating a disturbance from a displaced distance of a cylinder of a controlled object, and feeding back an estimated disturbance. The positioning control system also includes a saturation element and a low-pass element disposed in a feedback loop including the disturbance observer, and a saturated value changer for changing a saturated value of the saturation element based on a deviation. The saturation element is disposed in a forward path of a positive-feedback minor loop, whereas the low-pass element is disposed in a feedback path of the positive-feedback minor loop.

Abstract: An inner member having a supply port is installed at the inside of a housing, wherein the housing and the inner member are connected together by connecting bolts. Air is supplied to the supply port of the inner member and is directed and introduced through communication passages into an annular passage. Thereafter, the air is directed outwardly from a plurality of lead-out holes, which communicate with the annular passage, in a swirling direction with respect to an annular recess facing the workpiece. In addition, by having the air flow along the annular recess, which is formed with a substantially trapezoidal shape in cross section, the workpiece is maintained in a non-contact state with respect to a holding surface of the inner member.

Abstract: An inner member having a supply port is installed at the inside of a housing, wherein the housing and the inner member are connected together by connecting bolts. Air is supplied to the supply port of the inner member and is directed and introduced through communication passages into an annular passage. Thereafter, the air is directed outwardly from a plurality of lead-out holes, which communicate with the annular passage, in a swirling direction with respect to an annular recess facing the workpiece. In addition, by having the air flow along the annular recess, which is formed with a substantially trapezoidal shape in cross section, the workpiece is maintained in a non-contact state with respect to a holding surface of the inner member.

Abstract: A positioning control system has a disturbance observer for estimating a disturbance from a displaced distance of a cylinder of a controlled object, and feeding back an estimated disturbance. The positioning control system also includes a saturation element and a low-pass element disposed in a feedback loop including the disturbance observer, and a saturated value changer for changing a saturated value of the saturation element based on a deviation. The saturation element is disposed in a forward path of a positive-feedback minor loop, whereas the low-pass element is disposed in a feedback path of the positive-feedback minor loop.

Abstract: The invention includes a moving step of moving a piston to a target position by supplying and discharging compressed air to and from pressure chambers on opposite sides of the piston of a pressure cylinder by driving servo valves by a controller, a clamping step of allowing a pressure member at a tip end of a piston rod to touch a workpiece softly in this target position, and a pressing force applying step of pressing the workpiece with the pressure member in a required force.

Abstract: A pressure cylinder is connected to an air pressure source through a servo valve, the servo valve is controlled as an on/off switching valve by a control section in an advancing working step of a piston rod, and at the time of backward stroke of the piston rod, an operation position of the piston rod is detected by a position detector to feedback a detection signal to the control section, the servo valve is controlled by the control section such that a deviation between the operation position and a preset stopping position is eliminated, the piston rod is stopped at an intermediate stopping position, and a state in which substantially the same pressures are supplied to pressure chambers formed on opposite sides of the piston is maintained.

Abstract: The invention includes a moving step of moving a piston to a target position by supplying and discharging compressed air to and from pressure chambers on opposite sides of the piston of a pressure cylinder by driving servo valves by a controller, a clamping step of allowing a pressure member at a tip end of a piston rod to touch a workpiece softly in this target position, and a pressing force applying step of pressing the workpiece with the pressure member in a required force.

Abstract: An exciting coil is wound on a cylindrical yoke provided with a pair of pole teeth, a cylindrical permanent magnet where N pole and S pole are magnetized in a radial direction is disposed so as to be movable in a hollow portion of the yoke and the permanent magnet is coupled to a spool by a magnet holder, and a displacement sensor is disposed in a hollow portion of the permanent magnet so as to be positioned on a center axial line of the permanent magnet, so that the displacement of the permanent magnet is detected by the displacement sensor and the degree of opening of the spool is controlled by performing feedback of the displacement to a control portion.

Abstract: An exciting coil is wound on a cylindrical yoke provided with a pair of pole teeth, a cylindrical permanent magnet where N pole and S pole are magnetized in a radial direction is disposed so as to be movable in a hollow portion of the yoke and the permanent magnet is coupled toa spool byamagnet holder, and a displacement sensor is disposed in a hollow portion of the permanent magnet so as to be positioned on a center axial line of the permanent magnet, so that the displacement of the permanent magnet is detected by the displacement sensor and the degree of opening of the spool is controlled by performing feedback of the displacement to a control portion.

Abstract: A pressure cylinder is connected to an air pressure source through a servo valve, the servo valve is controlled as an on/off switching valve by a control section in an advancing working step of a piston rod, and at the time of backward stroke of the piston rod, an operation position of the piston rod is detected by a position detector to feedback a detection signal to the control section, the servo valve is controlled by the control section such that a deviation between the operation position and a preset stopping position is eliminated, the piston rod is stopped at an intermediate stopping position, and a state in which substantially the same pressures are supplied to pressure chambers formed on opposite sides of the piston is maintained.

Abstract: Disclosed is a pressure-adjusting mechanism comprising a pressure-adjusting handle, a pressure-adjusting screw for adjusting resilient force of a spring member by making rotation integrally with the pressure-adjusting handle, and a pressure-setting scale for indicating a preset pressure value by rotating the pressure-adjusting handle in a predetermined direction. As a result, it is possible to obtain the pressure-adjusting mechanism which is constructed integrally with a pressure control valve owing to a simple structure and which makes it possible to easily adjust the pressure by an operator.