Abstract: An impeller of a pump device includes a vane wheel fixed to a flange portion of a rotor member. The vane wheel includes a plurality of vane portions protruding from a disc portion opposed to the flange portion in an axial direction. At a tip end of each vane portion, a rib that is inserted into a fixing groove provided in the flange portion is provided. A gap in the axial direction is provided between a tip end of an inner peripheral portion including an end portion on an inner side in a radial direction of the rib and a bottom surface of the fixing groove, and a welded portion welded to the fixing groove is provided at a tip end on another side in the axial direction of an outer peripheral portion including an end portion on an outer side in the radial direction of the rib.

Abstract: A bearing unit comprises a cylindrical oil-impregnated bearing, in which a bearing bore to support a turning shaft is formed so as to enable the turning shaft to turn; a bearing holder, in which the oil-impregnated bearing is fixed by an inner bore; a first groove being formed in an axial direction on an inner circumferential surface of the oil-impregnated bearing; and a second groove being formed in an axial direction on at least one of an outer circumferential surface of the oil-impregnated bearing and an inner circumferential surface of the bearing holder. The second groove is formed so as to have a greater depth than that of the first groove. The second groove is also formed so as to have a larger cross section than that of the first groove.

Abstract: A bearing mechanism having a sleeve including at an inner circumferential surface thereof a first bearing surface and a relief portion including a diameter greater than that of the first bearing surface is used in a spindle motor. An axial length of the first bearing surface is between approximately 1.2 mm and 1.8 mm. By virtue of such configuration, characteristics of the spindle motor are improved and an operating life of the spindle motor is extended.

Abstract: A bearing unit comprises a cylindrical oil-impregnated bearing, in which a bearing bore to support a turning shaft is formed so as to enable the turning shaft to turn; a bearing holder, in which the oil-impregnated bearing is fixed by an inner bore; a first groove being formed in an axial direction on an inner circumferential surface of the oil-impregnated bearing; and a second groove being formed in an axial direction on at least one of an outer circumferential surface of the oil-impregnated bearing and an inner circumferential surface of the bearing holder. The second groove is formed so as to have a greater depth than that of the first groove. The second groove is also formed so as to have a larger cross section than that of the first groove.

Abstract: The disclosed invention provides a sintered oil-impregnated bearing equipped with a bearing hole having a clearance structure, in which a clearer boundary is formed between the bearing surface and the clearance surface, and a manufacturing method thereof. In a bearing hole of a radial bearing, a bearing surface and another bearing surface are formed at both ends in an axial direction, and a clearance surface is formed between both the bearing surface and the bearing surface. The bearing surfaces are formed by a sizing step for a compression-molded piece that is formed by a compression molding step. In the sizing step, diameter-reduction manufacturing is carried out for an end of the compression-molded piece to form a diameter-reduced section, and then afterward, a sizing core is inserted into the bearing hole of the compression-molded piece so as to eventually form the bearing surface.

Abstract: An input device for an injection molding machine is constructed with an input touch panel fitted over a display screen. The input touch panel is formed greater than the display screen. A panel extension portion of the input touch panel is located outside of the display screen. At least one key portion having at least one specific key is displayed on the panel extension portion. By this arrangement, no separate switch panel, such as a membrane sheet switch, is necessary and all inputs can be made by touch operation.

Abstract: An input device for an injection molding machine is constructed with an input touch panel fitted over a display screen. The input touch panel is formed greater than the display screen. A panel extension portion of the input touch panel is located outside of the display screen. At least one key portion having at least one specific key is displayed on the panel extension portion. By this arrangement, no separate switch panel, such as a membrane sheet switch, is necessary and all inputs can be made by touch operation.

Abstract: A dynamic pressure bearing apparatus comprises a rotary shaft, a sintered oil retaining bearing rotatably supporting the rotary shaft, the sintered oil retaining bearing having an interior surface defining an internal surface configuration for generating dynamic pressure to thereby form a dynamic pressure bearing between the rotary shaft and the sintered oil retaining bearing. The internal surface of the sintered oil retaining bearing comprises in a peripheral direction thereof, a minimum-gap section, a large-gap section and a separation groove section. The minimum-gap section has the minimum gap between the rotary shaft and the internal surface of the sintered oil retaining bearing.

Abstract: An air dynamic pressure bearing includes a shaft element, a bearing element relatively rotatably supporting the shaft element, and dynamic pressure generation grooves for generating a dynamic pressure by air formed between opposing surfaces of the shaft element and the bearing element. The bearing element is formed from a sintered alloy, and a solid lubricant material is disposed on the opposing surface of at least one of the shaft element and the bearing element.

Abstract: The dynamic pressure bearing device is structured such that the pores of porous material as they are are disposed in the surfaces thereof forming the negative pressure cancel portions 15b and a lubricating fluid is supplied to the negative pressure generating areas thereof through the pores of the negative pressure cancel portions 15b, whereby, even if recess-shaped grooves forming the negative pressure cancel portions 15b are formed shallow in depth and wide in width, or even if such grooves themselves are not formed at all, the dynamic pressure bearing device is able to fulfill its negative pressure cancel function in a sufficient manner. This makes it possible to eliminate the need for provision of the conventional recess-shaped grooves which are formed deep and narrow, thereby eliminating the need to execute an expensive operation such as a cutting operation or the like, so that the negative pressure cancel portions 15b can be formed at a low cost by inexpensive means such as by molding or the like.

Abstract: An injection molding system includes a program control section installed outside injection molding machines. The program control section includes a program file section that stores a plurality of different programs in the form of files, and a program transfer section that selects a computer program from the program file section and transfers the selected computer program to the controller of an arbitrary injection molding machine when the arbitrary injection molding machine is operated. Only when an injection molding machine is operated, a program (control program) for operating the injection molding machine is selected from the program file section of the program control section, and the thus-selected program is transferred to the corresponding controller by the program transfer section.

Abstract: In a method of controlling an accumulator connected to an oil hydraulic circuit of an injection molding machine, a charge start point and a charge end point for the accumulator are set for each of molding cycles or for each of step divisions constituting a single molding cycle. During molding, control is performed such that the charge start point and the charge end point are synchronized with each molding cycle. Thus, pressures in the respective steps of each molding cycle become constant (stable) among molding cycles.

Abstract: A sintered oil-impregnated bearing 20 used in a bearing device 30 is made by molding a mixture of a composite fine particles (main material) and a solid lubricant previously added to the main material in a proportion of about one weight percent to about three weight percent, wherein the main material comprises composite fine particles composed of iron powders having surfaces coated with copper, and the solid lubricant comprises fine particles made of an inorganic compound such as molybdenum disulfide and having surfaces coated with copper, sintering the mold at a temperature in a range of 650.degree. C. to 700.degree. C. to form a sintered body 20b, and impregnating the sintered body 20b with lubricant oil. Since the sintered body 20b itself has lubricity, the sintered oil-impregnated bearing is free from abrasion or seizure even if oil is used up.

Abstract: An injection molding machine in accordance with the present invention includes a storing function portion 2 composed of a first memory portion M1 for storing in advance a standard program Ps that becomes standard of a sequence program and a second memory portion M2 having one or more memory areas into which a user program Pu . . . to be interrupted into the standard program Ps can be written, a user program making portion 3 that can make the user program Pu . . . by indicating a process of making the user program Pu interrupt into the standard program Ps, and a controlling function portion 4 for writing the made user program Pu . . . into the memory area in the second memory portion M2 and executing both of the standard program Ps and the user program Pu . . . interrupted into the standard program Ps at the time of the molding operation.

Abstract: A position detecting system for an injection molding apparatus can detect the position of a plurality of movable portions of the injection molding apparatus. The position detecting system includes a single position detector capable of detecting respective positions of a plurality of objective portions arranged movably along a single scale portion. Each of the plurality of movable portions of the injection molding apparatus is coupled with one of the objective portions of the position detecting system and moves together with the respective objective portion.

Abstract: A control system is applicable for an injection molding machine which has a temperature setting function and display function. The control system includes a temperature scale/unit setting function for selecting a temperature setting and a displaying mode which changes a data display between a Centigrade mode (where a temperature setting device and temperature on the display are performed in Centigrade) and a Fahrenheit mode. The control system also includes a display switching function for temporarily switching the display mode to a mode different from the current temperature setting mode as set by the temperature scale/unit setting function and a display mode restoring function for switching the temporarily switched display mode to the original display mode.

Abstract: Lubricating oil composition for use with sintered porous bearings includes a poly-.alpha.-olefin hydride or ethylene-.alpha.-olefin copolymer hydride containing base oil to which at least one additive selected from the group consisting of zinc dialkyl dithiophosphate, molybdenum dialkyl dithiocarbide, molybdenum dialkyl dithiophosphate and a sulfur-phosphorus containing extreme pressure additive is added in an amount of 0.01 to 5 parts by weight per 100 parts by weight of the base oil.

Abstract: A temperature correction apparatus 1 of an injection molding machine for correcting detected values D.sub.2 . . . obtained from a plurality of thermostats 2 . . . set to an injection molding machine M and/or command values S.sub.2 . . . for performing temperature feedback control in accordance the detected values D.sub.2 . . . , comprising a correction constant computing section 11 for correcting first correction constants P.sub.2 . . . for the detected values D.sub.2 . . . and/or second correction constants Q.sub.2 . . . for the command values S.sub.2 . . . in accordance with detected values Di and Dj of the thermostats 2 . . . under different temperature conditions Ti and Tj and reference values Ei and Ej corresponding to the temperature conditions Ti and Tj, a storage section 12 for storing the obtained first correction constants P.sub.2 . . . and/or second correction constants Q.sub.2 . . . , and a correction computing section 13 for correcting the detected values D.sub. 2 . . . and/or command values S.

Abstract: A temperature control unit for an injection molding machine having a control thermostat capable of detecting the temperature of a fluid flowing out of dies, wherein plural injection unit thermostats are coupled to the control thermostat. A heating/cooling dual control thermostat is provided for detecting the temperature of the fluid flowing into the dies and the heating/cooling dual control thermostat is coupled to the control thermostat in a cascade connection, whereby an injection unit temperature control system and a die temperature control system are connected via a communication line. The resulting temperature control unit has a simplified construction for temperature control and has reduced cost, while improving operability and maneuverability thereof. By cascade-controlling the die temperature, highly stabilized temperature control may be realized.

Abstract: A method of setting molding conditions for an injection molding machine 1 using a mold 2 whose specifications data are unclear included three setting processes. In the first setting process A, by inputting known data into controller 3, the molding conditions based on a data base prepared in advance and said input known data are set. In the second setting process B, injection molding is performed according to prescribed molding conditions pre-selected concerning injection pressure P, injection speed V and the injection start position of screw 4, and then, based on the product just molded, injection pressure P is altered, to set said altered injection pressure P, injection speed V and proper pre-feed measurement value Md as molding conditions. In the third setting process C, injection molding is performed according to molding conditions obtained from said second setting process B, and subsequently, taking into account the findings from the product just molded, said molding conditions are adjusted.