Patents by Inventor Tadashi Okita

Tadashi Okita 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: 20190187673
    Abstract: To provide an observation device, an observation method, and a computer-readable medium developed to allow checking of observation data in entirety. An observation device comprises: a data acquisition unit that acquires observation data together with temporal information, the observation data including at least one of an internal behavior signal about a numerical controller for controlling a machine tool, etc., and feed axis control data and spindle control data detected from a motor of the machine tool, etc.; a setting unit that sets a time scale for the observation data acquired by the data acquisition unit; a print data generation unit that generates print data including the observation data represented on the time scale set by the setting unit; and a print data output unit that outputs the print data generated by the print data generation unit to a printer capable of producing a long printed matter.
    Type: Application
    Filed: November 13, 2018
    Publication date: June 20, 2019
    Inventors: Wei LUO, Junichi TEZUKA, Tadashi OKITA
  • Publication number: 20190120726
    Abstract: To provide an observation apparatus, an observation method and an observation program capable of easily understandable output of a relation between a signal waveform representing an actually-observed operation of a machine and an instruction program to the machine. An observation apparatus includes an observation data acquisition unit for acquiring observation data on an operation status of a machine along with time information, an execution status acquisition unit for acquiring execution status data including an execution position and a specific parameter value for an instruction program to the machine, along with time information, and a display unit for displaying the observation data and the execution status data in association with each other in time series.
    Type: Application
    Filed: October 1, 2018
    Publication date: April 25, 2019
    Inventors: Wei LUO, Tadashi OKITA, Junichi TEZUKA
  • Patent number: 10260966
    Abstract: To provide a motor control device that specifies a type of temperature sensor by a simple technique, even in a case of the type of temperature sensor installed to a motor being unclear.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: April 16, 2019
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Tadashi Okita
  • Patent number: 10248102
    Abstract: A numerical controller for controlling a machine tool including a spindle motor formed of an induction motor includes: a storage unit that stores a maximum acceleration at which the spindle motor can operate when a magnetic flux amount of the spindle motor reaches its maximum; a magnetic flux amount acquisition unit that acquires a present magnetic flux amount of the spindle motor; and an acceleration change unit that changes an acceleration of a position command based on a maximum acceleration of the spindle motor stored in the storage unit according to a magnetic flux amount at the start of movement of the spindle motor acquired by the magnetic flux amount acquisition unit when the spindle motor is operated by position control using a position command.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: April 2, 2019
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Publication number: 20190097567
    Abstract: To determine a driving parameter for driving a motor having an unknown circuit constant in a simple way and to shorten time required for the determination.
    Type: Application
    Filed: September 6, 2018
    Publication date: March 28, 2019
    Applicant: FANUC CORPORATION
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20190089786
    Abstract: To collect state data more reliably. A data collection device which is connected communicably with a plurality of data transfer devices includes: a data collection unit that collects, from each of the plurality of data transfer devices, state data, which is data related to a state of an industrial machine grouped with the data transfer device; and a communication control unit that controls transmission of the state data from the plurality of data transfer devices to the data collection unit, according to an instruction to the plurality of data transfer devices based on a first standard, in which the communication control unit, in a case of receiving, from any of the plurality of data transfer devices, a first signal which is based on a usage condition of a temporary storage unit of the data transfer device, performs the control by a second standard which differs from the first standard.
    Type: Application
    Filed: August 13, 2018
    Publication date: March 21, 2019
    Inventors: Junichi TEZUKA, Tadashi OKITA
  • Patent number: 10232480
    Abstract: A controller of a machine tool capable of suppressing heat generation and realizing a stable cutting operation during deep cutting is provided. A numerical controller for controlling a machine tool including a spindle motor formed of an induction motor and a feed axis driving motor includes: a magnetic flux amount acquisition means that acquires a present magnetic flux amount of the spindle motor; and a speed change means that changes a speed of the feed axis driving motor on the basis of the magnetic flux amount.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: March 19, 2019
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Tadashi Okita
  • Patent number: 10209700
    Abstract: A machine tool controller according to an embodiment of the present invention, for controlling a spindle and a feed axis, includes a motor temperature obtaining unit for obtaining and outputting the winding temperature of a spindle motor as a motor temperature; an inverter temperature obtaining unit for obtaining and outputting the temperature of an inverter that drives the spindle motor as an inverter temperature; a motor temperature comparator for comparing the outputted motor temperature with an overheat temperature for the motor; an inverter temperature comparator for comparing the outputted inverter temperature with an overheat temperature for the inverter; and an overheating assessment unit for imposing a restriction on the output of the spindle motor according to the smaller one of the differences between the motor temperature and the overheat temperature for the motor and between the inverter temperature and the overheat temperature for the inverter.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: February 19, 2019
    Assignee: FANUC CORPORATION
    Inventors: Daisuke Tajima, Tadashi Okita
  • Patent number: 10209697
    Abstract: A controller for controlling a synchronized operation of spindle and feed axes.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: February 19, 2019
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Daisuke Tajima, Tadashi Okita
  • Publication number: 20190025770
    Abstract: Information is collected from a management target device having a drive unit such as a machine tool, and this collected information is more practically used. An information collection device includes a collection unit that collects, from management target devices having a drive unit, operating state information which is information indicating an operating state of the management target device while operating accompanying movement of the drive unit; and a comparison unit that extracts a plurality of sets of information matching in a predetermined condition from the operating state information thus collected, and outputs a comparison result of the plurality of sets of information thus extracted.
    Type: Application
    Filed: May 17, 2018
    Publication date: January 24, 2019
    Inventor: Tadashi OKITA
  • Publication number: 20180375458
    Abstract: An anomaly diagnosing device diagnoses an anomaly in a single motor driven by multiple motor drive units. The multiple motor drive units supply AC currents to multiple multi-phase windings of the motor to drive the motor. The anomaly diagnosing device includes: a power consumption calculator for calculating power consumption in each of the multi-phase windings; a power difference calculator for calculating a difference in power consumption between the multi-phase windings; and a determination unit for determining that an anomaly is occurring when the absolute value of the difference has exceeded a threshold for a predetermined period of time.
    Type: Application
    Filed: June 18, 2018
    Publication date: December 27, 2018
    Applicant: FANUC CORPORATION
    Inventors: Yuuki Morita, Kenji Takahashi, Tadashi Okita
  • Publication number: 20180321322
    Abstract: An abnormality diagnosing device diagnoses a driving abnormality of a single motor driven by a plurality of motor driving devices. The motor driving devices drive the motor by supplying three-phase alternating currents to a plurality of three-phase windings possessed by the motor. The abnormality diagnosing device is equipped with a rotational speed acquisition unit for acquiring a rotational speed value of the motor, a current acquisition unit for acquiring phase current values of respective phases flowing through the three-phase windings, and a determination unit for determining the presence of an abnormality, if an absolute value of the rotational speed value exceeds a predetermined value, and an absolute value of the phase current value of any one phase of the three-phase windings is less than a threshold value continuously for a predetermined time period.
    Type: Application
    Filed: May 1, 2018
    Publication date: November 8, 2018
    Applicant: FANUC CORPORATION
    Inventors: Yuuki Morita, Tadashi Okita, Kenji Takahashi
  • Publication number: 20180321319
    Abstract: An abnormality diagnosing device diagnoses a driving abnormality of a single motor driven by a plurality of motor driving devices. The plurality of motor driving devices calculate a plurality of voltage command values based on a speed command, and voltages are applied to a plurality of windings possessed by the motor based on the plurality of calculated voltage command values, thereby driving the motor. The abnormality diagnosing device is equipped with a command value difference calculating unit for calculating a difference between the plurality of voltage command values calculated by the plurality of motor driving devices, and a determination unit for determining the presence of an abnormality, when an absolute value of the difference calculated exceeds a first threshold value continuously for a predetermined time period.
    Type: Application
    Filed: May 1, 2018
    Publication date: November 8, 2018
    Applicant: FANUC CORPORATION
    Inventors: Yuuki Morita, Kenji Takahashi, Tadashi Okita
  • Patent number: 10090789
    Abstract: To provide a motor control device capable of causing a motor to rotate in any rotation direction, even when leaving the connection state of the motor of a machine tool as standard.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: October 2, 2018
    Assignee: FANUC CORPORATION
    Inventors: Tadashi Okita, Yuuki Morita, Daisuke Tajima
  • Publication number: 20180259930
    Abstract: An object is to provide the numerical control device of a machine tool which can achieve both a reduction in heat generation and stability in heavy cutting. A numerical control device includes a command transmission portion which transmits a speed command value and a magnetic flux command value to the spindle control portion of a machine tool and a storage portion which stores magnetic flux amounts corresponding to tools that may be used in the machine tool. The numerical control device also includes a tool detection portion which detects a tool selected in the machine tool and a magnetic flux amount setting portion which commands the command transmission portion to read, from the storage portion, a magnetic flux amount corresponding to the tool detected by the tool detection portion and to output the magnetic flux amount to the spindle control portion of the machine tool.
    Type: Application
    Filed: March 7, 2018
    Publication date: September 13, 2018
    Applicant: FANUC CORPORATION
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Patent number: 10065255
    Abstract: A controller for controlling a synchronized operation of spindle and feed axes. A spindle-axis control section includes an initial-motion control section for making a spindle axis perform an accelerated rotation at maximum capacity from a process start position; a maximum-acceleration detecting section for detecting a maximum acceleration of the spindle axis; a residual rotation-amount detecting section for detecting a residual rotation amount of the spindle axis; a current-speed detecting section for detecting a current speed of the spindle axis; a positioning-motion control section for making the spindle axis perform a decelerated rotation so as to reach the target thread depth after the accelerated rotation; and an overshoot detecting section for detecting an overshoot of the spindle axis during the decelerated rotation.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: September 4, 2018
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Tadashi Okita, Daisuke Tajima
  • Publication number: 20180239328
    Abstract: A numerical controller for controlling a machine tool including a spindle motor formed of an induction motor includes: a storage unit that stores a maximum acceleration at which the spindle motor can operate when a magnetic flux amount of the spindle motor reaches its maximum; a magnetic flux amount acquisition unit that acquires a present magnetic flux amount of the spindle motor; and an acceleration change unit that changes an acceleration of a position command based on a maximum acceleration of the spindle motor stored in the storage unit according to a magnetic flux amount at the start of movement of the spindle motor acquired by the magnetic flux amount acquisition unit when the spindle motor is operated by position control using a position command.
    Type: Application
    Filed: February 13, 2018
    Publication date: August 23, 2018
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20180239339
    Abstract: To reliably collect measured data without requiring a large-capacity storage device. A data collection device which is connected with a plurality of machine tools via a network includes: a priority calculation means for calculating a degree of relative priority for each of the plurality of machines tools, based on information related to a state of each of the machine tools; and a measured data collection means for deciding, in a case of receiving a collection request of measured data for the machine tool, which machine tool among the machine tools corresponding to the collection request to set as a collection target of the measured data based on the degree of relative priority, and for collecting the measured data from the machine tool decided as the collection target via the network.
    Type: Application
    Filed: January 31, 2018
    Publication date: August 23, 2018
    Inventors: Keitarou INAGAKI, Junichi TEZUKA, Tadashi OKITA
  • Patent number: 10048672
    Abstract: To provide a motor control device that prevents from becoming excessive correction, upon adding a backlash correction amount to a position command for a motor.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: August 14, 2018
    Assignee: FANUC CORPORATION
    Inventors: Shoutarou Hashimoto, Tadashi Okita, Yuuki Morita
  • Publication number: 20180224827
    Abstract: To provide a monitoring device, a machine tool, and a monitoring system capable of collecting data efficiently required for examining an alarm. A monitoring device is connected to multiple machine tools through a network. The monitoring device comprises: a monitoring unit that monitors the occurrence of an alarm in the machine tools; an acquisition unit that acquires a set of measurement target data items responsive to an alarm from a database on the occurrence of the alarm; and a collection unit that sets the set of measurement target data items in the multiple machine tools, and collects data measured by following the setting.
    Type: Application
    Filed: February 2, 2018
    Publication date: August 9, 2018
    Inventors: Kazuyuki SUGIYAMA, Junichi TEZUKA, Tadashi OKITA