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).

  • Patent number: 11067972
    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: Grant
    Filed: November 13, 2018
    Date of Patent: July 20, 2021
    Assignee: FANUC CORPORATION
    Inventors: Wei Luo, Junichi Tezuka, Tadashi Okita
  • Patent number: 11048236
    Abstract: The determination of a slip constant is simplified upon driving a motor for which the slip constant is unknown, based on variation of acceleration when accelerating an induction motor from start up to a predetermined speed. A parameter determination support device for motor driving includes: an automatic measurement part which automatically measures characteristic information including a speed during acceleration and acceleration upon driving an induction motor to accelerate from start up to a predetermined speed set in advance which is no more than a base speed of the induction motor, relative to each slip constant, based on a plurality of slip constants set in advance; and an estimation part which estimates, as a slip constant of the induction motor, a slip constant having the smallest variation in acceleration, among a plurality of slip constants, based on the characteristic information.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: June 29, 2021
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 11003162
    Abstract: A data collection device capable of reducing the load of a data collection process and network communication by monitoring trigger at a plurality of cycles is provided. The data collection device includes a control unit, and the control unit includes: an event monitoring unit that acquires first trigger information from the machine tool at a first cycle and monitors whether a starting condition and an ending condition for acquisition of the data have been established on the basis of the first trigger information; a sampling control unit that instructs the machine tool to sample the data at a second cycle shorter than the first cycle when the starting condition is established and instructs the machine tool to end the sampling when the ending condition is established; and a data acquisition unit that acquires the data sampled by the machine tool from the machine tool together with second trigger information.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: May 11, 2021
    Assignee: FANUC CORPORATION
    Inventors: Kazuyuki Sugiyama, Junichi Tezuka, Tadashi Okita
  • Patent number: 11003170
    Abstract: To provide a parameter determination support device and a program capable of simplifying determination of driving parameters upon driving a motor for which the slip constant is unknown.
    Type: Grant
    Filed: April 10, 2019
    Date of Patent: May 11, 2021
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10955813
    Abstract: A control apparatus of a machine tool, the control apparatus including: a numerical control unit configured to create a spindle axis command and a feed axis command according to a tapping program; a spindle axis control unit configured to control rotational operation of the spindle axis according to the spindle axis command; a rotation detector configured to detect a rotation position of the spindle axis; and a feed axis control unit configured to control feeding operation of the feed axis according to the feed axis command on the basis of the rotation position. The numerical control unit is further configured to include, in the spindle axis command, a speed command value during return that does not depend on maximum rotation speed during machining of the spindle axis and that is higher than the maximum rotation speed during machining, as a command of return operation.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: March 23, 2021
    Assignee: Fanuc Corporation
    Inventors: Daisuke Tajima, Yuuki Morita, Tadashi Okita
  • Patent number: 10928452
    Abstract: To simplify determination of drive parameters upon driving a motor for which circuit constants are unknown, and shorten the time required in determination.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: February 23, 2021
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Publication number: 20210011498
    Abstract: A servo motor controller capable of eliminating inconvenience that the position of a shaft or the like of a servo motor is detected or set erroneously due to influence of noise or the like is provided. A servo motor controller that detects Z-phase signals of an incremental-type encoder that detects rotation of a servo motor to perform driving control of the servo motor includes: a position detection unit that detects a reference position of a rotating shaft of the servo motor on the basis of the Z-phase signal of the encoder; a signal interval detection unit that measures intervals of a plurality of detected Z-phase signals; and an abnormality determination unit that determines that the Z-phase signal is abnormal when the interval measured by the signal interval detection unit is equal to or larger than a prescribed threshold.
    Type: Application
    Filed: July 9, 2020
    Publication date: January 14, 2021
    Applicant: FANUC CORPORATION
    Inventors: Daisuke TAJIMA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20200382034
    Abstract: A motor control device according to an aspect of the present disclosure controls a motor by switching between speed control and position control, and sets a maximum voltage applied to the motor during the position control to lower than a maximum voltage applied to the motor during the speed control.
    Type: Application
    Filed: April 28, 2020
    Publication date: December 3, 2020
    Applicant: FANUC CORPORATION
    Inventors: Daisuke TAJIMA, Yuuki MORITA, Tadashi OKITA
  • Patent number: 10838371
    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: Grant
    Filed: May 17, 2018
    Date of Patent: November 17, 2020
    Assignee: FANUC CORPORAITON
    Inventor: Tadashi Okita
  • Patent number: 10802474
    Abstract: To simplify determination of drive parameters upon driving a motor for which circuit constants are unknown, and shorten the time required in determination. A parameter determination support device includes: an automatic measurement part which applies initial parameters, and automatically measures a revolution speed (rpm) of a synchronous motor, as well as a DC link voltage (V) and Q-phase voltage command (%) of a motor drive device, as operating information upon driving the synchronous motor at substantially constant speed based on a base speed, according to a test-run program; an estimation part which estimates a reverse voltage constant (V/krpm) and torque constant (Nm/Arms) as circuit constants of the synchronous motor based on the operating information; and a calculation part which performs calculation of optimum parameters tailored to the output specification of the synchronous motor based on the circuit constants.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: October 13, 2020
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Publication number: 20200249635
    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: April 21, 2020
    Publication date: August 6, 2020
    Inventor: Tadashi OKITA
  • Publication number: 20200201289
    Abstract: The determination of a slip constant is simplified upon driving a motor for which the slip constant is unknown, based on the acceleration time when accelerating an induction motor from start up to a predetermined rotation number. A parameter determination support device for motor driving includes: an automatic measurement part which automatically measures characteristic information including the acceleration time upon driving an induction motor to accelerate from start up to a predetermined rotation number set in advance, relative to each slip constant, based on a plurality of slip constants set in advance; and an estimation part which estimates, as the slip constant of the induction motor, a slip constant at which the acceleration time up to a predetermined rotation number becomes the shortest, among a plurality of slip constants, based on the characteristic information.
    Type: Application
    Filed: November 15, 2019
    Publication date: June 25, 2020
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20200201288
    Abstract: The determination of a slip constant is simplified upon driving a motor for which the slip constant is unknown, based on variation of acceleration when accelerating an induction motor from start up to a predetermined speed. A parameter determination support device for motor driving includes: an automatic measurement part which automatically measures characteristic information including a speed during acceleration and acceleration upon driving an induction motor to accelerate from start up to a predetermined speed set in advance which is no more than a base speed of the induction motor, relative to each slip constant, based on a plurality of slip constants set in advance; and an estimation part which estimates, as a slip constant of the induction motor, a slip constant having the smallest variation in acceleration, among a plurality of slip constants, based on the characteristic information.
    Type: Application
    Filed: October 30, 2019
    Publication date: June 25, 2020
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Patent number: 10678222
    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: Grant
    Filed: January 31, 2018
    Date of Patent: June 9, 2020
    Assignee: FANUC CORPORATION
    Inventors: Keitarou Inagaki, Junichi Tezuka, Tadashi Okita
  • Patent number: 10663943
    Abstract: To simplify determination of drive parameters upon driving a motor for which circuit constants are unknown, and shorten the time required in determination.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: May 26, 2020
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10656620
    Abstract: A motor control device is a motor control device which controls a spindle motor in a machine tool, and includes: a moving average filter which moving averages a torque command value or drive current value of the spindle motor for averaging time and generates averaged load information of the spindle motor; and an averaging time calculation unit which calculates, as the averaging time of the moving average filter, a first time of an integral multiple of a period of one rotation of the spindle driven by the spindle motor, or a second time of an integral multiple of a value arrived at by dividing the period of one rotation of the spindle by the number of cutting tooth of the tool.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: May 19, 2020
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Tadashi Okita
  • Patent number: 10615734
    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: Grant
    Filed: September 6, 2018
    Date of Patent: April 7, 2020
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10571886
    Abstract: A machine tool control device according to the present invention includes a feedback counter for obtaining A- and B-phase signals of rectangular waves or sine waves and a one-rotation signal, which are outputted from a sensor for detecting the position or speed of a driven axis or a motor, to calculate a feedback count value that is a count value of the number of feedback pulses generated from the A- and B-phase signals; a feedback count value storage unit for storing an inter-one-rotation-signal feedback count value that is the feedback count value counted between the two sequential one-rotation signals; a reference value storage unit for storing an anomaly determination reference value corresponding to the inter-one-rotation-signal feedback count value; and an anomaly cause determination unit for determining the cause of an anomaly by comparison between the inter-one-rotation-signal feedback count value and the anomaly determination reference value.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: February 25, 2020
    Assignee: FANUC CORPORATION
    Inventors: Tadashi Okita, Yuuki Morita, Geng Li
  • Patent number: 10551817
    Abstract: A controller controlling a synchronized operation of spindle and feed axes. The controller is configured to make a spindle axis perform an accelerated rotation at maximum capacity from a starting position aiming at a maximum rotation speed; detect a maximum acceleration of the spindle axis; detect a residual rotation amount of the spindle axis; detect a current speed of the spindle axis; and execute a position control for making the spindle axis perform a decelerated rotation so as to reach a target position, after the accelerated rotation at maximum capacity. The controller is further configured to make the spindle axis perform the decelerated rotation at a positioning deceleration higher than a deceleration corresponding to the maximum acceleration and equal to or lower than a maximum deceleration capable of compensating for a mechanical loss in a drive source during the decelerated rotation of the spindle axis.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: February 4, 2020
    Assignee: FANUC CORPORATION
    Inventors: Tadashi Okita, Yuuki Morita, Daisuke Tajima
  • Patent number: 10539931
    Abstract: To provide a time-series data analysis device which allows to compare time-series data easily.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: January 21, 2020
    Assignee: FANUC CORPORATION
    Inventors: Wei Luo, Junichi Tezuka, Tadashi Okita