Patents by Inventor Hiroo Okubo
Hiroo Okubo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11338488Abstract: A mold clamping device includes a base, a stationary platen fixed to the base and supporting a stationary mold, a movable platen movable on the base and supporting a movable mold, and a mold clamping mechanism for clamping the movable mold against the stationary mold. Tie bars extend from the stationary platen completely through both the movable platen and the mold clamping mechanism. A shaft supporting plate is fixed to the base and has openings through which the tie bars slidably extend for supporting the tie bars. The shaft supporting plate terminates at its lower end portion in two spaced-apart shoes that are fixed to the base. The bottom surface of each shoe has a larger area than the cross-sectional area of the shaft supporting plate situated vertically above the shoe.Type: GrantFiled: December 25, 2020Date of Patent: May 24, 2022Inventors: Hozumi Yoda, Satoshi Hoshino, Hiroo Okubo, Atsushi Murata, Keiichi Tozawa
-
Patent number: 11117300Abstract: A mold clamping device includes a base, a stationary platen fixed to the base and supporting a stationary mold, a movable platen movable on the base and supporting a movable mold, and a mold clamping mechanism for clamping the movable mold against the stationary mold. Tie bars extend from the stationary platen completely through both the movable platen and the mold clamping mechanism. A shaft supporting plate is fixed to the ends of the tie bars and terminates at its lower end portion in two spaced-apart shoes that have flat bottom surfaces in direct sliding contact with the base. The flat bottom surface of each shoe has a larger area than the cross-sectional area of the shaft supporting plate situated vertically above the shoe.Type: GrantFiled: March 20, 2020Date of Patent: September 14, 2021Inventors: Hozumi Yoda, Satoshi Hoshino, Hiroo Okubo, Atsushi Murata, Keiichi Tozawa
-
Publication number: 20210114273Abstract: A mold clamping device includes a base, a stationary platen, a movable platen, a mold clamping mechanism, a tie bar, and a half nut. This mold clamping device further includes a shaft supporting plate supporting a tip of the tie bar. This shaft supporting plate is fixed to the tip of the tie bar, and is mounted on the base so as to be freely movable.Type: ApplicationFiled: December 25, 2020Publication date: April 22, 2021Inventors: Hozumi YODA, Satoshi HOSHINO, Hiroo OKUBO, Atsushi MURATA, Keiichi TOZAWA
-
Publication number: 20200307051Abstract: A mold clamping device includes a base, a stationary platen, a movable platen, a mold clamping mechanism, a tie bar, and a half nut. This mold clamping device further includes a shaft supporting plate supporting a tip of the tie bar. This shaft supporting plate is fixed to the tip of the tie bar, and is mounted on the base so as to be freely movable.Type: ApplicationFiled: March 20, 2020Publication date: October 1, 2020Inventors: Hozumi YODA, Satoshi HOSHINO, Hiroo OKUBO, Atsushi MURATA, Keiichi TOZAWA
-
Patent number: 10300529Abstract: A mold clamping apparatus of the type including a mold opening/closing actuator and a mold clamping cylinder, wherein rails for guiding a movable platen are disposed on a base, and the mold clamping cylinder has a left leg and a right leg each disposed between one pair of left and right rails of the rails. The rails provided for guiding the movable platen is used also as a side guide for the mold clamping cylinder. This arrangement can obviate the need for a separate guide member.Type: GrantFiled: June 13, 2017Date of Patent: May 28, 2019Assignee: NISSEI PLASTIC INDUSTRIAL CO., LTD.Inventors: Atsushi Murata, Daiki Tanemura, Hiroo Okubo
-
Publication number: 20180001378Abstract: A mold clamping apparatus of the type including a mold opening/closing actuator and a mold clamping cylinder, wherein rails for guiding a movable platen are disposed on a base, and the mold clamping cylinder has a left leg and a right leg each disposed between one pair of left and right rails of the rails. The rails provided for guiding the movable platen is used also as a side guide for the mold clamping cylinder. This arrangement can obviate the need for a separate guide member.Type: ApplicationFiled: June 13, 2017Publication date: January 4, 2018Inventors: Atsushi MURATA, Daiki TANEMURA, Hiroo OKUBO
-
Patent number: 9056416Abstract: An injection molding apparatus has at least two mold clamping mechanisms for clamping respective molds. A hydraulic pressure supply source supplies hydraulic pressure to the at least two mold clamping mechanisms to clamp the respective molds. A a hydraulic-pressure-supply-destination selection section is configured to allow hydraulic pressure from the hydraulic pressure supply source to be selectively supplied to any one of the two mold clamping mechanisms. At least two injecting machines are configured to inject resin material to the respective molds clamped by the respective two mold clamping mechanisms. A non-hydraulic power supply source drives the at least two injecting machines to inject the resin material.Type: GrantFiled: May 9, 2013Date of Patent: June 16, 2015Assignee: NISSEI PLASTIC INDUSTRIAL CO., LTD.Inventors: Toru Ikeda, Hiroo Okubo, Akira Obinata
-
Publication number: 20130309350Abstract: An injection molding apparatus includes, as its drive sources, an electric power supply source, compressed air source and hydraulic pressure supply source. A hydraulic-pressure-supply-destination selection section supplies hydraulic pressure from the hydraulic pressure supply source to a selected one of first and second mold clamping cylinders. Necessary capacity of the hydraulic pressure supply source can be lowered as compared to a case where all of the mold clamping mechanisms and injecting machines are driven by hydraulic pressure. Because only a selected one of the mold clamping mechanisms is driven at a time, the necessary capacity of the hydraulic pressure supply source can be halved as compared to a case where the mold clamping mechanisms are driven simultaneously.Type: ApplicationFiled: May 9, 2013Publication date: November 21, 2013Applicant: Nissei Plastic Industrial Co., Ltd.Inventors: Toru IKEDA, Hiroo OKUBO, Akira OBINATA
-
Patent number: 7223093Abstract: A screw shaft for driving an injection screw driving body in a motor-driven injection device is coupled to a motor shaft of an electric motor in engagement of splines. A spline for the motor shaft engaging with a spline disposed at the outer periphery at a shaft end of the screw shaft is fitted into a recess formed inside of a motor shaft end. A flange formed around the spline is clamped at end face of the motor shaft via a bolt, and is formed at the inner periphery of a bearing sleeve detachably mounted to the motor shaft. An annular groove is formed at the inner periphery of an opening of the bearing sleeve for the side of the screw shaft. A ring member for air-tightly sealing a clearance formed between the screw shaft and the bearing sleeve is fitted into the annular groove. The spline for the motor shaft engaging with the spline on the screw shaft is disposed at the inner periphery of the bearing sleeve independent of the motor shaft, thus achieving the coupling via the respective splines of the motors.Type: GrantFiled: December 9, 2003Date of Patent: May 29, 2007Assignee: Nissei Plastic Industrial Co., Ltd.Inventors: Kinji Yokoya, Hiroshi Yamaura, Hiroo Okubo
-
Publication number: 20050123347Abstract: A screw shaft for driving an injection screw driving body in a motor-driven injection device is coupled to a motor shaft of an electric motor in engagement of splines. A spline for the motor shaft engaging with a spline disposed at the outer periphery at a shaft end of the screw shaft is fitted into a recess formed inside of a motor shaft end. A flange formed around the spline is clamped at end face of the motor shaft via a bolt, and is formed at the inner periphery of a bearing sleeve detachably mounted to the motor shaft. An annular groove is formed at the inner periphery of an opening of the bearing sleeve for the side of the screw shaft. A ring member for air-tightly sealing a clearance formed between the screw shaft and the bearing sleeve is fitted into the annular groove. The spline for the motor shaft engaging with the spline on the screw shaft is disposed at the inner periphery of the bearing sleeve independent of the motor shaft, thus achieving the coupling via the respective splines of the motors.Type: ApplicationFiled: December 9, 2003Publication date: June 9, 2005Inventors: Kinji Yokoya, Hiroshi Yamaura, Hiroo Okubo
-
Patent number: 6811392Abstract: The object of the present invention is to provide a traction type electric injection molding machine requiring only one electric motor for mold clamping and only one rotational transformer, with a mold clamping apparatus installed on the top of a bed and between the front and rear ends of the bed, and with an injection apparatus installed between them. A fixed platen 21 and a supporting platen 22 are mounted oppositely on a bed 1 and connected by tie bars 30 backward and forward. Traction rods 23 insert through the platens 21 and 22, from which their ends protrude. The tip ends of the traction rods 23 carry a movable platen 24, which can be moved toward and away from the fixed platen 21. The rear ends of the traction rods 23 carry a traction plate 25. A mold clamping apparatus 2 includes a motion transformer 29, which includes a screw shaft 26 and a nut 28. The screw shaft 26 fixed to the traction plate 25.Type: GrantFiled: April 2, 2002Date of Patent: November 2, 2004Assignee: Nissei Plastic Industrial Co., Ltd.Inventors: Hiroo Okubo, Tadahiro Hosokawa
-
Patent number: 6592360Abstract: A mold clamping apparatus of an injection molding machine is equipped with a drive mechanism for opening, closing, and clamping a mold. The drive mechanism includes a first drive mechanism portion including a first drive motor portion and a first ball-screw mechanism portion and advancing and retracting a movable platen in order to effect high-speed mold opening/closing operation; a second drive mechanism portion including a second drive motor portion and a second ball-screw mechanism portion and pressing a pressure platen in order to effect high-pressure mold clamping operation; and a clutch mechanism for connecting the pressure platen to the movable platen in a pressure applicable manner when the movable platen is located at a mold close position. The first drive mechanism portion advances and retracts the movable platen in order to effect high-speed mold opening/closing operation.Type: GrantFiled: December 7, 2000Date of Patent: July 15, 2003Assignee: Nissei Plastic Industrial Co., Ltd.Inventors: Tsukasa Yoda, Hiroo Okubo
-
Patent number: 6554606Abstract: A mold clamping apparatus of an injection molding machine includes a drive mechanism. The drive mechanism includes a first drive mechanism for opening/closing a mold at high speed through advancement/retreat of a movable platen effected by means of a first drive motor unit and a first ball screw mechanism; a second drive mechanism for clamping the mold at high pressure through application of pressure to a pressing member effected by means of a second drive motor unit and a second ball screw mechanism; an engagement mechanism for engaging the movable platen with the pressing member in the course of advancement of the movable platen; and a clutch mechanism which is operated after establishment of the engagement effected by the engagement mechanism, in order to interlock the pressing member with the movable platen to thereby enable the pressing member to apply pressure to the movable platen.Type: GrantFiled: September 22, 2000Date of Patent: April 29, 2003Assignee: Nissei Plastic Industrial Co., Ltd.Inventors: Atsushi Koide, Hiroo Okubo, Junichi Yamashita, Isamu Yamaguchi
-
Patent number: 6527536Abstract: A mold-thickness adjustment mechanism is provided which uses intermediate toothed wheels engaging with a pair of toothed wheels on a tie-bar side. The mechanism includes a toothed wheel on an outer surface of a pressure-receiving plate and toothed wheels with a large diameter for mold-thickness adjustment provided together with a toothed wheel-driving motor on the side of the pressure-receiving plate on the central portion of an outer surface of the pressure-receiving plate. Intermediate toothed wheels are arranged between the toothed wheels with the large diameter and a pair of toothed wheels of one side of the pressure-receiving plate to engage each other. A pair of the toothed wheels is designed to rotate by rotation of the intermediate toothed wheels at the same time, whereby a diameter of the toothed wheel with the large diameter is constituted approximately equally to the breadth of the plate body of the pressure-receiving plate.Type: GrantFiled: March 29, 2001Date of Patent: March 4, 2003Assignee: Nissei Plastic Industrial Co., Ltd.Inventors: Hiroo Okubo, Junichi Yamashita, Isamu Yamaguchi
-
Publication number: 20020142066Abstract: The object of the present invention is to provide a traction type electric injection molding machine requiring only one electric motor for mold clamping and only one rotational transformer, with a mold clamping apparatus installed on the top of a bed and between the front and rear ends of the bed, and with an injection apparatus installed between them. A fixed platen 21 and a supporting platen 22 are mounted oppositely on a bed 1 and connected by tie bars 30 backward and forward. Traction rods 23 insert through the platens 21 and 22, from which their ends protrude. The tip ends of the traction rods 23 carry a movable platen 24, which can be moved toward and away from the fixed platen 21. The rear ends of the traction rods 23 carry a traction plate 25. A mold clamping apparatus 2 includes a motion transformer 29, which includes a screw shaft 26 and a nut 28. The screw shaft 26 fixed to the traction plate 25.Type: ApplicationFiled: April 2, 2002Publication date: October 3, 2002Applicant: Nissei Plastic Industrial Co., Ltd.Inventors: Hiroo Okubo, Tadahiro Hosokawa
-
Publication number: 20010051194Abstract: A mold clamping apparatus of an injection molding machine is equipped with a drive mechanism for opening, closing, and clamping a mold. The drive mechanism includes a first drive mechanism portion including a first drive motor portion and a first ball-screw mechanism portion and advancing and retracting a movable platen in order to effect high-speed mold opening/closing operation; a second drive mechanism portion including a second drive motor portion and a second ball-screw mechanism portion and pressing a pressure platen in order to effect high-pressure mold clamping operation; and a clutch mechanism for connecting the pressure platen to the movable platen in a pressure applicable manner when the movable platen is located at a mold close position. The first drive mechanism portion advances and retracts the movable platen in order to effect high-speed mold opening/closing operation.Type: ApplicationFiled: December 7, 2000Publication date: December 13, 2001Inventors: Tsukasa Yoda, Hiroo Okubo
-
Publication number: 20010026818Abstract: An inconvenience where using a mold-thickness adjustment mechanism according to a toothed wheels with a large diameter for a toggle type vertical mold-clamping device in which a fixed plate, a pressure-receiving plate and a movable platen or the like is constituted by an oblong plate body is solved by using intermediate toothed wheels engaging with a pair of toothed wheels on a tie-bar side. Ends of four pieces of tie-bar 4 are secured to a fixed plate 1. The other ends are formed into threaded shafts 5, and are clamped and fixed to the pressure-receiving plate 2 by means of adjusting nuts with a toothed wheel 8 on an outer surface of the pressure-receiving plate, which toothed wheels are in position. Toothed wheels 16 with the large diameter for mold-thickness adjustment is provided together with a toothed wheel-driving motor 22 on the side of the pressure-receiving plate on the central portion of an outer surface of a pressure-receiving plate.Type: ApplicationFiled: March 29, 2001Publication date: October 4, 2001Applicant: NISSEI PLASTIC INDUSTRIAL CO., LTD.Inventors: Hiroo Okubo, Junichi Yamashita, Isamu Yamaguchi