Abstract: In an information processing system in which a server supplying document data and a client requesting the server to transfer the document data are connected via a network, the server assigns priorities to respective data constituting the document data. When the client requesting the transfer of a particular document datum detects the presence of a plurality of data embedded in the document data or linked to the document data, the client further requests the transfer of a plurality of such data. Upon receipt of the request for the transfer of a plurality of data, the server transfers the respective data in order of precedence, starting with a datum with the highest priority among the data. This enables the client to obtain data with higher priorities sooner. Further, even if a line is disconnected in the middle of transfer, the amount of data that must be reread by restoring the line connection can be minimized.

Abstract: A spool 33 provided with a flange 39 is inserted in a spool bore 32, and a pressing force of a spring 52 is always applied through the flange 39 to the spool 33 at its one end in a second pressure chamber 35. A fluid groove 60 is formed in an inner peripheral surface of the spool bore 32 at a position near an abutment surface 51. A hydraulic fluid under the same pressure P2 as that in the second pressure chamber 35 is introduced to the fluid groove 60 through a fluid passage 61 formed in a valve body 31. When the flange 39 and the abutment surface 51 are in contact with each other, the hydraulic fluid is allowed to enter the interface between them through the fluid groove 60. A rise of the cracking pressure, which occurs upon the flange coming into tightly close contact with the abutment surface, can be prevented without reducing the strength of the flange 39, and stable opening/closing characteristics of the spool 33 can be achieved.

Abstract: A spool 33 provided with a flange 39 is inserted in a spool bore 32, and a pressing force of a spring 52 is always applied through the flange 39 to the spool 33 at its one end in a second pressure chamber 35. A fluid groove 60 is formed in an inner peripheral surface of the spool bore 32 at a position near an abutment surface 51. A hydraulic fluid under the same pressure P2 as that in the second pressure chamber 35 is introduced to the fluid groove 60 through a fluid passage 61 formed in a valve body 31. When the flange 39 and the abutment surface 51 are in contact with each other, the hydraulic fluid is allowed to enter the interface between them through the fluid groove 60. A rise of the cracking pressure, which occurs upon the flange coming into tightly close contact with the abutment surface, can be prevented without reducing the strength of the flange 39, and stable opening/closing characteristics of the spool 33 can be achieved.

Abstract: A valve timing control device for adjusting the timing of opening a valve of an internal combustion engine includes a torsion spring having one end engaged with a shoe housing and the other end engaged with a vane rotor to urge the vane rotor, relative to the shoe housing, toward the advancing side or the delaying side. The end of the torsion spring engaged with the vane rotor is rotatable together with the vane rotor and inwardly directed in the radial direction, referencing the torsion spring. The vane rotor has a hook groove with which the inwardly-directed end of the torsion spring is engaged. Thus, a driven member having the vane rotor can be made smaller. Also, there is no need to form the hook groove inside the vane, so vane strength is not compromised and sealing with the vane is attained.

Abstract: To permit forcedly stopping combining flows of pressure fluid from two hydraulic pumps when a load pressure on a combined-flow-driven actuator in which the flows of pressure fluid are combined together exceeds a predetermined pressure and hence to permit driving the combined-flow-driven actuator with the pressure fluid from only one of the hydraulic pumps, a hydraulic drive system is provided with a flow-combining valve 2 connected to a directional control valve 1 in a first group of directional control valves via a center bypass passage 3, a flow-combining circuit 5 communicating the flow-combining valve 2 and a supply port of a flow-combining directional control valve 4 with each other, and a combined-flow-driven actuator 20 controlled by the flow-combining directional control valve 4, and performs overall power control such that a total value of input torques to the two hydraulic pumps 15,18 does not exceed an output torque from an engine 30.

Abstract: To permit forcedly stopping combining flows of pressure fluid from two hydraulic pumps when a load pressure on a combined-flow-driven actuator in which the flows of pressure fluid are combined together exceeds a predetermined pressure and hence to permit driving the combined-flow-driven actuator with the pressure fluid from only one of the hydraulic pumps, a hydraulic drive system is provided with a flow-combining valve 2 connected to a directional control valve 1 in a first group of directional control valves via a center bypass passage 3, a flow-combining circuit 5 communicating the flow-combining valve 2 and a supply port of a flow-combining directional control valve 4 with each other, and a combined-flow-driven actuator 20 controlled by the flow-combining directional control valve 4, and performs overall power control such that a total value of input torques to the two hydraulic pumps 15,18 does not exceed an output torque from an engine 30.

Abstract: A hydraulic circuit system having a load sensing system including a hydraulic pump, a plurality of hydraulic actuators driven by a hydraulic fluid delivered from the hydraulic pump, a plurality of control valves disposed between the hydraulic pump and the plurality of acutators, a signal detecting hydraulic line to which a signal pressure based on a maximum load pressure among the plurality of hydraulic actuators is introduced, and pump control means for controlling a delivery pressure of the hydraulic pump to be held higher than the signal pressure by a predetermined value.

Abstract: A fixed throttle 12 is provided in a delivery line 11a of a fixed pump 11 driven by an engine 9 for rotation together with a hydraulic pump 1, and a differential pressure detecting valve 31 is provided in association with the fixed throttle 12 to detect a differential pressure across the fixed throttle 12 and to output a pressure lower than the detected differential pressure by a predetermined value. The output of the differential pressure detecting valve 31 is introduced, as a signal pressure, to a pressure bearing section 5c of a load sensing valve 5, thereby setting a target differential pressure. With that arrangement, a pressure in link with an engine revolution speed can be directly employed as the set differential pressure of the load sensing valve, and the structure of the load sensing valve can be avoided from being complicated.

Abstract: It is an object of the present invention to provide a control valve which can reduce the number of external lines connected to a hydraulic remote control valve. A control valve 1 for controlling hydraulic cylinders 2,2′ is provided, in one 26 of spool covers, with fluid passages 27,27′, a shuttle valve 28 for selecting higher one of pilot pressures to be transmitted to these fluid passages 27,27′, and a fluid passage 29 for transmitting the pressure selected by the shuttle valve 28. The fluid passages 27,27′ are in communication with pressure fluid ports 25,25′ as connection ports for pilot lines 24a,24c. The control valve 1 is also provided, in the other spool cover 32, with fluid passages 33,33′, a shuttle valve 34 for selecting higher one of pilot pressures to be transmitted to these fluid passages 33,33′, and a fluid passage 35 for transmitting the pressure selected by the shuttle valve 34.

Abstract: A hydraulic line slit 20 formed in a valve body 50 of a flow distribution valve 5-1, a control chamber 70, and a hydraulic line 31-1 are connected to a signal transmitting hydraulic line 9. A lap portion 32 is formed in the hydraulic line slit 20, the lap portion 32 having a check valve function with a lap amount X when the valve body 50 is in a cutoff position. A 2-position, 3-way valve 11 is disposed in the hydraulic line 31-1. The valve 11 connects the control chamber 70 of the flow distribution valve 5-1 to only the signal transmitting hydraulic line 9 when an external signal F is not applied, and to both the signal transmitting hydraulic line 9 and a lower-pressure detecting hydraulic line 35, which is connected an outlet passage 5b of a flow distribution valve 5-2 on the side of a hydraulic actuator 3-2, when the external signal F is applied.

Abstract: A recovery check valve 26 and a piston valve 27 are axially slidably disposed within a spool 2 in coaxial relation. An axial fluid passage 32 is formed within a cylindrical portion 27a of the piston valve 27, and a seat portion 33 for the recovery check valve is formed at an open end of the cylindrical portion 27a. The cylindrical portion 37a of the piston valve is formed with a hole 36 through which a hydraulic fluid in the fluid chamber 32 is introduced to a bridge passage 21 when the spool 2 is operated so as to introduce a hydraulic fluid from a hydraulic pump to the bottom side of a hydraulic cylinder. Fluid passages 40, 31 are formed within the spool so that a hydraulic fluid in the bridge passage 21 is introduced to the closed end of the piston valve through the fluid passages when the spool is operated in the opposite direction. With such a structure, the size of the valve apparatus can be set to the same size as the directional control valve not provided with the recovery check valve.

Abstract: Pressure compensating valves disposed at inlet sides of directional control valves are each configured with a step-shaped spool having a larger diameter portion and smaller diameter portions and pressure receiving chambers are provided to sandwich the larger diameter portion such that a pump delivery pressure and an inlet pressure of a metering throttle of the directional control valve acts in the chambers, respectively, and further pressure receiving chambers are provided at respective ends of the smaller diameter portions such that an outlet pressure of the metering throttle and a signal pressure act in the chambers, respectively. A check valve operated by the outlet pressure of the metering throttle is fitted in the smaller diameter end portion positioned on the side of the pressure receiving chamber to reduce the pump delivery pressure and produce a signal pressure.

Abstract: A pair of directional control valves 8 and a pair of hold check valves 9 are disposed respectively between a pair of metering notches 6, which are formed in a land 4-1 of a spool 2 and have functions of both flow rate control and direction control, and a pair of actuator ports A, B. Each hold check valve comprises a valve body 90 in the form of a hollow spool having a seat portion 12 formed on an outer periphery and being subject to a pressure developed in an outlet passage 10 communicating with one of the actuator ports to act in the valve-closing direction. Each flow distribution valve comprises a valve body 80 being slidably fitted in the valve body 90 and having a front surface positioned to face an inlet passage 7 communicating with the metering notch and a rear surface positioned to face an control pressure chamber 30 communicating with a signal detecting hydraulic line.

Abstract: In a hydraulic control system including a valve device B for controlling a hydraulic fluid supplied from a hydraulic pump A to a hydraulic cylinder C, the valve device comprises a spool 16 slidably fitted into a valve body 1, and a non-leak valve 27 for controlling communication of an actuator passage 19. The non-leak valve comprises a main valve section 40 including a seat valve 41 provided in the valve body, and a pilot control section 60 including a pilot poppet valve 61 provided in an end cover 31. The seat valve is controlled in proportion to an opening of the pilot poppet valve, and a relief valve 55 for preventing the hydraulic cylinder from being subject to an overload is built in the seat valve. The non-leak valve thus fulfills a load holding function and an overload relief function. By arranging the non-leak valve and the spool in two lines, the valve device can be made more compact.

Abstract: An image processing apparatus comprises: a blank discriminating circuit to discriminate a blank from image information; a line discriminating circuit to discriminate line information from information of the discriminated blank; and a paragraph recognizing circuit to recognize paragraph information from the discriminated blank information and the discriminated line information. The apparatus recognizes not only character but also blanks from the input image information and generates a result in a desired form.

Abstract: An image processing apparatus includes an image input unit for inputting image information, a trimming unit for trimming an area for classifying and summarizing the image information input by the image input unit, a recognition unit for recognizing information representing each image information in the area trimmed by the trimming unit, and a search unit for searching image information by at least one of pieces of the information recognized by the recognition unit.

Abstract: A hydraulic drive system comprises a check valve cb1 for detecting a pressure on the outlet side of a pressure compensating device VB1, a maximum load pressure detecting line SL1 for selecting higher one of the pressure detected by the check valve cb1 and a load pressure of an actuator associated with a hydraulic pump P1 and supplying it as a signal pressure, a check valve cb2 for detecting a pressure on the outlet side of a pressure compensating device VB2, a maximum load pressure detecting line SL2 for selecting higher one of the pressure detected by the check valve cb2 and a load pressure of an actuator associated with a hydraulic pump P2 and supplying it as a signal pressure independently of the maximum load pressure detecting line SL1, and a passage 300 for joining hydraulic fluids supplied from the hydraulic pumps P1, P2 and passing through variable restrictors RB1, RB2 with each other and supplying it to an actuator B. Mutual independence between the two hydraulic pumps P1, P2 can be thereby ensured.

Abstract: A hydraulic drive system for construction machines with an improved pressure compensating valve assembly comprising a first directional control valve (3, 5, 7) of closed center type connected in series with a second directional control valve (12) of open center type.

Abstract: A pressure control valve has a main valve element of seat type slidably accommodated in a valve case for controlling communication between inlet and outlet sections of the valve case by movement of the main valve element, a control chamber defined within the valve case and between the valve case and an end face of the main valve remote from the outlet section for biasing the main valve element in a valve closing direction, and a variable restriction variable in its opening in response to the movement of the main valve element for communication between the control chamber and the inlet section of the valve case.

Abstract: An image processing apparatus includes an image input unit for imputting image information, a trimming unit for trimming an area for classifying and summarizing the image information input by the image input unit, a recognition unit for recognizing information representing each image information in the area trimmed by the trimming unit, and a search unit for searching image information by at least one of pieces of the information recognized by the recognition unit.