Patents by Inventor Wataru Shiraishi

Wataru Shiraishi 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).

  • Publication number: 20100152940
    Abstract: Upon the occurrence of the abnormality that the inverter for driving the motor is in the one-phase short circuited state, this inverter is stopped in the three-phase short circuited state and sets the execution torque by subtracting the counter electromotive force application torque that is applied the driveshaft due to the counter electromotive force generated by rotation of the motor and the steering angle application torque corresponding to the steering angle from the torque demand according to the step-on amount of the accelerator pedal. The engine and the inverter for driving the motor is controlled so that the vehicle is driven with the set execution torque. This enables the driving force output to the driveshaft from the engine and the motor to be in accordance with the torque demand.
    Type: Application
    Filed: July 11, 2008
    Publication date: June 17, 2010
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Noritake Mitsutani, Wataru Shiraishi
  • Patent number: 7722349
    Abstract: An injection molding machine estimates a check valve wear amount, making it possible to predict a check valve use limit. At start of injection, the check valve is at a position advanced a stroke S0 with respect to a screw position (a position of a check seat that contacts the check valve and closes a resin flow channel). As the screw advances, the check valve retreats and closes when the screw moves a distance X0. When the check valve is worn ?S (S1=S0+?S), it closes when the screw moves X1. Since the check valve stroke and the distance the screw moves until the check valve closes are proportional, S0/X0=S1/X1=a. Therefore, ?S=aX1?S0, and the wear amount ?S can be obtained by detecting the check valve closing position X1 and using this position X1 and the known stroke S0. The closing position is detected from the peak value of rotational force acting on the screw. Once the wear amount is obtained, the check valve use limit can be predicted from an allowable value of wear.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: May 25, 2010
    Assignee: Fanuc Ltd
    Inventors: Akira Oomori, Junpei Maruyama, Satoshi Takatsugi, Wataru Shiraishi
  • Patent number: 7665978
    Abstract: A mold is mounted with a locating ring mated into a hole in a stationary platen. A distance measuring unit is disposed to the side of the injection nozzle. The distance A between the sprue hole and the outer circumference of the locating ring and the distance B between the distance measuring unit and the outer circumference of the locating ring are both known. The distance C between the central axis of the nozzle hole and the side of the injection nozzle is also known. If the distance D to the side of the injection nozzle is measured by means of the distance measuring unit, the displacement between the central axis of the sprue hole and the central axis of the nozzle hole is obtained by calculating {(A+B)?(C+D)}. The injection nozzle is centered by being moved manually or automatically by the amount corresponding to the displacement.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: February 23, 2010
    Assignee: Fanuc Ltd
    Inventors: Satoshi Takatsugi, Wataru Shiraishi, Toshio Ishikuro, Hiroyasu Asaoka, Hiroshi Imamura
  • Publication number: 20090053349
    Abstract: Screw rotation speeds and screw rotating torques are measured at predetermined time intervals during metering and substituted into a previously-assumed function to determine a maximum screw rotating torque at each screw rotation speed. An allowable upper limit of screw rotating torque is set for each screw rotation speed on the basis of the determined maximum screw rotating torque. If a screw rotating torque exceeding the allowable upper limit is detected during metering after the allowable upper limit is set, the screw rotation is stopped or changed.
    Type: Application
    Filed: July 17, 2008
    Publication date: February 26, 2009
    Applicant: FANUC LTD
    Inventors: Hiroshi IMAMURA, Wataru SHIRAISHI, Satoshi TAKATSUGI
  • Publication number: 20080317897
    Abstract: An injection molding machine nozzle capable of letting heat escape from a nozzle end portion and preventing the occurrence of cobwebbing with a simple structure. A heat conducting member is mounted on the nozzle end portion. When the end of the nozzle is contacted against a mold the heat conducting member also contacts the mold. The heat conducting member is composed of the material having heat conductivity equal to or greater than that of the nozzle. The heat of the nozzle end portion is conducted to the heat conducting member and released at the mold, thus preferentially cooling only melted resin of the nozzle end portion. Cobwebbing does not occur even when the mold is opened and the molded article is removed because the melted resin of the muzzle end portion has been cooled.
    Type: Application
    Filed: June 16, 2008
    Publication date: December 25, 2008
    Applicant: FANUC LTD
    Inventors: Hiroyasu ASAOKA, Wataru SHIRAISHI, Satoshi Takatsugi
  • Publication number: 20080305202
    Abstract: An injection molding machine estimates a check valve wear amount, making it possible to predict a check valve use limit. At start of injection, the check valve is at a position advanced a stroke S0 with respect to a screw position (a position of a check seat that contacts the check valve and closes a resin flow channel). As the screw advances, the check valve retreats and closes when the screw moves a distance X0. When the check valve is worn ?S (S1=S0+?S), it closes when the screw moves X1. Since the check valve stroke and the distance the screw moves until the check valve closes are proportional, S0/X0=S1/X1=a. Therefore, ?S=aX1?S0, and the wear amount ?S can be obtained by detecting the check valve closing position X1 and using this position X1 and the known stroke S0. The closing position is detected from the peak value of rotational force acting on the screw. Once the wear amount is obtained, the check valve use limit can be predicted from an allowable value of wear.
    Type: Application
    Filed: November 9, 2007
    Publication date: December 11, 2008
    Applicant: FANUC LTD
    Inventors: Akira OOMORI, Junpei MARUYAMA, Satoshi TAKATSUGI, Wataru SHIRAISHI
  • Patent number: 7452198
    Abstract: A controller for an injection molding machine capable of reducing an extension of a cycle time in a screw retreat process after the end of measurement, obtaining a more accurate and uniform measured resin amount, and determining measurement conditions in a short period of time. After the measurement is finished, the screw is stopped from rotating and retreated at a first speed V1. The screw is reversely rotated at a predetermined speed Rv in a set zone. As this is done, the screw is retreated at a second speed V2 lower than the first speed V1. After the reverse rotation zone is terminated, the screw is stopped from rotating and retreated at a third speed V3 to a set retreat stop position. By doing this, the cycle time can be made shorter than in the case where the retreat and reverse rotation of the screw are performed separately. Since the retreating speed of the screw is low while the screw is being reversely rotated, a sudden pressure change can be suppressed, so that precise measurement can be made.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: November 18, 2008
    Assignee: Fanuc Ltd
    Inventors: Wataru Shiraishi, Toshio Ishikuro, Satoshi Takatsugi, Tatsuhiro Uchiyama, Hiroshi Watanabe, Tatsuya Kawasaki, Junpei Maruyama
  • Patent number: 7435070
    Abstract: When a metering process is started, a screw rotates at a preset rotating speed, thereby carrying out back pressure control to keep the pressure of a resin at a preset pressure, and retreats. When the screw is located near a preset metering completion position, the control mode is switched to positioning control for the preset metering completion position, and a screw rotation stop command is outputted. The screw overruns for some distance before its rotation stops after it retreats and stops at the preset metering completion position. A resin quantity for the overrun is corrected to obtain a preset metered resin quantity by reversely rotating the screw by a rotational amount corresponding to the overrun.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: October 14, 2008
    Assignee: Fanuc Ltd.
    Inventors: Wataru Shiraishi, Satoshi Takatsugi, Toshio Ishikuro, Hiroyasu Asaoka
  • Patent number: 7431583
    Abstract: The invention provides an injection molding capable of adjusting a detection level with a simple structure and detecting a deposit level of the resin pellets near a plasticizing screw. A cooling jacket is mounted so that a resin supplying hole of the cooling jacket communicates with a resin supplying hole of a heating cylinder. A sensor head mounted on a sensor mounting plate is inserted into the resin supplying hole through a sensor insertion port provided on a hopper plate and a resin inlet and detects the deposit level of the resin pellets deposited in the resin supplying hole. Changing the extent of insertion of the sensor head enables the resin pellets deposit detection level to be changed, and further, enables the deposit level near the outer periphery of the screw to be detected. Setting the sensor detection direction perpendicular to the resin deposit direction enables dirtying of the sensor detection surface by the resin pellets to be reduced, thus enabling erroneous detection readings to be reduced.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: October 7, 2008
    Assignee: Fanuc Ltd
    Inventors: Satoshi Takatsugi, Wataru Shiraishi, Hiroyasu Asaoka, Toshio Ishikuro, Hiroshi Imamura
  • Publication number: 20070196530
    Abstract: A controller for an injection molding machine capable of reducing an extension of a cycle time in a screw retreat process after the end of measurement, obtaining a more accurate and uniform measured resin amount, and determining measurement conditions in a short period of time. After the measurement is finished, the screw is stopped from rotating and retreated at a first speed V1. The screw is reversely rotated at a predetermined speed Rv in a set zone. As this is done, the screw is retreated at a second speed V2 lower than the first speed V1. After the reverse rotation zone is terminated, the screw is stopped from rotating and retreated at a third speed V3 to a set retreat stop position. By doing this, the cycle time can be made shorter than in the case where the retreat and reverse rotation of the screw are performed separately. Since the retreating speed of the screw is low while the screw is being reversely rotated, a sudden pressure change can be suppressed, so that precise measurement can be made.
    Type: Application
    Filed: February 22, 2007
    Publication date: August 23, 2007
    Applicant: FANUC LTD
    Inventors: Wataru Shiraishi, Toshio Ishikuro, Satoshi Takatsugi, Tatsuhiro Uchiyama, Hiroshi Watanabe, Tatsuya Kawasaki, Junpei Maruyama
  • Patent number: 7235198
    Abstract: When a metering process is started, a screw rotates at a preset rotating speed, thereby carrying out back pressure control to keep the pressure of a resin at a preset pressure, and retreats. When the screw is located near a preset metering completion position, the control mode is switched to positioning control for the preset metering completion position, and a screw rotation stop command is outputted. The screw overruns for some distance before its rotation stops after it retreats and stops at the preset metering completion position. A resin quantity for the overrun is corrected to obtain a preset metered resin quantity by reversely rotating the screw by a rotational amount corresponding to the overrun.
    Type: Grant
    Filed: November 7, 2003
    Date of Patent: June 26, 2007
    Assignee: Fanuc Ltd.
    Inventors: Wataru Shiraishi, Satoshi Takatsugi, Toshio Ishikuro, Hiroyasu Asaoka
  • Publication number: 20070026096
    Abstract: The invention provides an injection molding capable of adjusting a detection level with a simple structure and detecting a deposit level of the resin pellets near a plasticizing screw. A cooling jacket is mounted so that a resin supplying hole of the cooling jacket communicates with a resin supplying hole of a heating cylinder. A sensor head mounted on a sensor mounting plate is inserted into the resin supplying hole through a sensor insertion port provided on a hopper plate and a resin inlet and detects the deposit level of the resin pellets deposited in the resin supplying hole. Changing the extent of insertion of the sensor head enables the resin pellets deposit detection level to be changed, and further, enables the deposit level near the outer periphery of the screw to be detected. Setting the sensor detection direction perpendicular to the resin deposit direction enables dirtying of the sensor detection surface by the resin pellets to be reduced, thus enabling erroneous detection readings to be reduced.
    Type: Application
    Filed: July 24, 2006
    Publication date: February 1, 2007
    Applicant: FANUC LTD
    Inventors: Satoshi Takatsugi, Wataru Shiraishi, Hiroyasu Asaoka, Toshio Ishikuro, Hiroshi Imamura
  • Patent number: 7125232
    Abstract: A screw is rotated at a set speed and retreated by performing back pressure control for keeping a resin pressure at a set pressure. When the retreat position of the screw reaches a change point set nearby a set metering completion position, the back pressure control for keeping the resin pressure at a set resin pressure is stopped. A command for positioning the screw at a metering completion position is output to position the screw at the metering completion position. At the same time, when a screw position reaches the change point, the screw is reversed by a set value at a set speed.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: October 24, 2006
    Assignee: Fanuc LTD
    Inventors: Hiroshi Watanabe, Tatsuhiro Uchiyama, Wataru Shiraishi, Satoshi Takatsugi
  • Publication number: 20060193943
    Abstract: When a metering process is started, a screw rotates at a preset rotating speed, thereby carrying out back pressure control to keep the pressure of a resin at a preset pressure, and retreats. When the screw is located near a preset metering completion position, the control mode is switched to positioning control for the preset metering completion position, and a screw rotation stop command is outputted. The screw overruns for some distance before its rotation stops after it retreats and stops at the preset metering completion position. A resin quantity for the overrun is corrected to obtain a preset metered resin quantity by reversely rotating the screw by a rotational amount corresponding to the overrun.
    Type: Application
    Filed: April 28, 2006
    Publication date: August 31, 2006
    Applicant: FANUC LTD
    Inventors: Wataru shiraishi, Satoshi Takatsugi, Toshio Ishikuro, Hiroyasu Asaoka
  • Publication number: 20050161848
    Abstract: A mold is mounted with a locating ring mated into a hole in a stationary platen. A distance measuring unit is disposed to the side of the injection nozzle. The distance A between the sprue hole and the outer circumference of the locating ring and the distance B between the distance measuring unit and the outer circumference of the locating ring are both known. The distance C between the central axis of the nozzle hole and the side of the injection nozzle is also known. If the distance D to the side of the injection nozzle is measured by means of the distance measuring unit, the displacement between the central axis of the sprue hole and the central axis of the nozzle hole is obtained by calculating {(A+B)?(C+D)}. The injection nozzle is centered by being moved manually or automatically by the amount corresponding to the displacement.
    Type: Application
    Filed: January 13, 2005
    Publication date: July 28, 2005
    Inventors: Satoshi Takatsugi, Wataru Shiraishi, Toshio Ishikuro, Hiroyasu Asaoka, Hiroshi Imamura
  • Publication number: 20040096534
    Abstract: When a metering process is started, a screw rotates at a preset rotating speed, thereby carrying out back pressure control to keep the pressure of a resin at a preset pressure, and retreats. When the screw is located near a preset metering completion position, the control mode is switched to positioning control for the preset metering completion position, and a screw rotation stop command is outputted. The screw overruns for some distance before its rotation stops after it retreats and stops at the preset metering completion position. A resin quantity for the overrun is corrected to obtain a preset metered resin quantity by reversely rotating the screw by a rotational amount corresponding to the overrun.
    Type: Application
    Filed: November 7, 2003
    Publication date: May 20, 2004
    Applicant: Fanuc Ltd.
    Inventors: Wataru Shiraishi, Satoshi Takatsugi, Toshio Ishikuro, Hiroyasu Asaoka
  • Publication number: 20040091567
    Abstract: A screw is rotated at a set speed and retreated by performing back pressure control for keeping a resin pressure at a set pressure. When the retreat position of the screw reaches a change point set nearby a set metering completion position, the back pressure control for keeping the resin pressure at a set resin pressure is stopped. A command for positioning the screw at a metering completion position is output to position the screw at the metering completion position. At the same time, when a screw position reaches the change point, the screw is reversed by a set value at a set speed.
    Type: Application
    Filed: October 31, 2003
    Publication date: May 13, 2004
    Applicant: FANUC LTD.
    Inventors: Hiroshi Watanabe, Tatsuhiro Uchiyama, Wataru Shiraishi, Satoshi Takatsugi
  • Publication number: 20030230829
    Abstract: An injection apparatus in an injection molding machine transmits a drive force generated by an injecting servomotor to a screw through a drive force transmitting mechanism to move the screw for performing injection. In addition, the injection apparatus has a dead zone of movement provided by a predetermined distance in the range of the injecting servomotor to the screw.
    Type: Application
    Filed: May 2, 2003
    Publication date: December 18, 2003
    Applicant: Fanuc Ltd.
    Inventors: Wataru Shiraishi, Satoshi Takatsugi, Toshio Ishikuro
  • Patent number: 6382948
    Abstract: A temperature control device for a proximal portion of a heating cylinder of an injection molding machine capable of performing check and control of a flow rate of a heat medium easily, improving maintainability and also reducing a manufacturing cost. At least one pair of through holes for flowing the heat medium for temperature control are formed in a jacket to be attached to a proximal portion of a heating cylinder of an injection molding machine. In a passage by pipes connecting the through holes and forming the passage with the through holes, a flow-rate control mechanism and a flow-rate detection mechanism for the heat medium flowing in the passage are arranged. The heat medium is supplied to the passage to control temperature of the proximal portion of the heating cylinder.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: May 7, 2002
    Assignee: Fanuc Ltd.
    Inventors: Satoshi Takatsugi, Wataru Shiraishi, Toshio Ishiguro
  • Patent number: 6328551
    Abstract: An excessive load detection device for an injection molding machine capable of detecting an excessive load exerted on the injection screw when the screw is driven with resin remaining unmolten in the heating cylinder. An output torque of the servomotor for axially moving the screw is limited to a predetermined value by a torque limiter and the screw is driven to move forward in a direction of injection by a predetermined amount at a predetermined velocity. If reference time elapses before the axial motion of the set amount is completed or a position deviation exceeds a reference value, it is determined that the remaining resin has low fluidity to cause an excessive load on the screw and an alarm is issued. When the axial motion of the screw is completed without an alarm, the screw is moved backward and forward alternately predetermined times. A servomotor for rotating the screw is driven in the same manner to detect an excessive load on the screw.
    Type: Grant
    Filed: September 14, 2000
    Date of Patent: December 11, 2001
    Assignee: Fanuc Ltd.
    Inventors: Satoshi Takatsugi, Hiroshi Watanabe, Wataru Shiraishi