Patents by Inventor Koji Eba
Koji Eba 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).
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Publication number: 20220147027Abstract: Provided is a cell controller for controlling an operation of a machining cell including two or more machines and one or more robots as work resources, the cell controller being configured to control the operation of the machining cell based on a production program recorded with one or more processes to be executed at the time of producing only one article of a corresponding item in the machining cell among production programs prepared corresponding to one or more items produced in the machining cell.Type: ApplicationFiled: November 10, 2021Publication date: May 12, 2022Inventors: Masato RYOKI, Koji EBA, Akihito KATAOKA, Takatoshi ASAI
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Patent number: 8019460Abstract: A numerical controller having a function-generating unit which executes function generation for shaft movement according to a machining program is provided, the numerical controller further comprising a unit which stores shape data of the movable unit and shape data of an interfering structure; a retracting direction determining unit which determines a retracting direction; an interference checking position calculating unit which successively calculates, as an interference checking position, a position in which a desired distance is added to the current position of the movable unit according to the determined retracting direction; an interference confirming unit which confirms presence or absence of interference between the shape data of the movable unit and the shape data of the interfering structure by virtually moving the shape data of the movable unit; and a power outage detecting unit which sends a power outage signal to a DC power supply unit and the function-generating unit during power outage, whereinType: GrantFiled: September 9, 2008Date of Patent: September 13, 2011Assignee: Okuma CorporationInventors: Noritaka Akaiwa, Koji Eba
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Patent number: 7571669Abstract: In a noncircular shape machining apparatus, a tool 7 is moved reciprocally in an X-axis direction by a tool-moving mechanism. A first acceleration sensor 6 is disposed on a saddle 11, which is an immovable section of the tool-moving mechanism. Further, a second acceleration sensor 15 is disposed on a spindle bearing 5 of a spindle that holds and causes a workpiece 1 to rotate. Additionally, displacements of the saddle 11 and the workpiece 1 are measured by these two acceleration sensors 6 and 15, and displacement in the relative distance between the workpiece 1 and the tool 7 is acquired as relative displacement on the basis of the two displacements that have been obtained. Additionally, the position of the tool 7 is calculated from the obtained displacement and the output value of an X-axis linear scale 12.Type: GrantFiled: December 17, 2007Date of Patent: August 11, 2009Assignee: Okuma CorporationInventor: Koji Eba
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Publication number: 20090082900Abstract: A numerical controller having a function-generating unit which executes function generation for shaft movement according to a machining program is provided, the numerical controller further comprising a unit which stores shape data of the movable unit and shape data of an interfering structure; a retracting direction determining unit which determines a retracting direction; an interference checking position calculating unit which successively calculates, as an interference checking position, a position in which a desired distance is added to the current position of the movable unit according to the determined retracting direction; an interference confirming unit which confirms presence or absence of interference between the shape data of the movable unit and the shape data of the interfering structure by virtually moving the shape data of the movable unit; and a power outage detecting unit which sends a power outage signal to a DC power supply unit and the function-generating unit during power outage, whereinType: ApplicationFiled: September 9, 2008Publication date: March 26, 2009Applicant: OKUMA CORPORATIONInventors: Noritaka Akaiwa, Koji Eba
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Publication number: 20080141836Abstract: In a noncircular shape machining apparatus, a tool 7 is moved reciprocally in an X-axis direction by a tool-moving mechanism. A first acceleration sensor 6 is disposed on a saddle 11, which is an immovable section of the tool-moving mechanism. Further, a second acceleration sensor 15 is disposed on a spindle bearing 5 of a spindle that holds and causes a workpiece 1 to rotate. Additionally, displacements of the saddle 11 and the workpiece 1 are measured by these two acceleration sensors 6 and 15, and displacement in the relative distance between the workpiece 1 and the tool 7 is acquired as relative displacement on the basis of the two displacements that have been obtained. Additionally, the position of the tool 7 is calculated from the obtained displacement and the output value of an X-axis linear scale 12.Type: ApplicationFiled: December 17, 2007Publication date: June 19, 2008Applicant: OKUMA CorporationInventor: Koji Eba
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Patent number: 7026779Abstract: A motor control apparatus of the present invention comprises a velocity detector for detecting a rotation velocity of a mover of a motor, a position detector for detecting a position of the mover, a differentiator for performing time differentiation with respect to the position detected by the position detector to obtain a velocity calculation value, a feedback signal generating circuit for generating a feedback signal including the velocity detection value obtained by the velocity detector as a high frequency component and the velocity calculation value obtained by the differentiator as a low frequency component, and a linear amplifier and an integrating amplifier for performing PI control, the linear amplifier and the integrating amplifier performing linear amplification and integrating amplification of a difference between the velocity instruction and the feedback signal, respectively.Type: GrantFiled: September 27, 2004Date of Patent: April 11, 2006Assignee: Okuma CorporationInventor: Koji Eba
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Publication number: 20050067996Abstract: A motor control apparatus of the present invention comprises a velocity detector for detecting a rotation velocity of a mover of a motor, a position detector for detecting a position of the mover, a differentiator for performing time differentiation with respect to the position detected by the position detector to obtain a velocity calculation value, a feedback signal generating circuit for generating a feedback signal including the velocity detection value obtained by the velocity detector as a high frequency component and the velocity calculation value obtained by the differentiator as a low frequency component, and a linear amplifier and an integrating amplifier for performing PI control, the linear amplifier and the integrating amplifier performing linear amplification and integrating amplification of a difference between the velocity instruction and the feedback signal, respectively.Type: ApplicationFiled: September 27, 2004Publication date: March 31, 2005Inventor: Koji Eba
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Patent number: 6281644Abstract: To prevent adverse effect, on machining accuracy, of cogging thrust of linear motors when used in a combined linear motor driving a machine tool. Three linear motor movers are fixedly attached to a moving table of a machine tool, while three linear motor stators are fixedly attached to a base. The three linear motors are driven in parallel to thereby drive the moving table. The respective linear motor stators are fixed to the base so as to have fixed phases relative to the base, stepwisely displaced by an electrical angle 60° whereby cogging thrust is leveled in the entire combined linear motor.Type: GrantFiled: April 20, 2000Date of Patent: August 28, 2001Assignees: Okuma Corporation, Kabushiki Kaisha Yaskawa DenkiInventors: Toshiteru Komatsu, Koji Eba, Katsuyoshi Kitagawa, Yasuhiro Miyamoto, Takashi Nagase
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Patent number: 6185217Abstract: A device and an initializing method for use in a ring communication path, which can highly accurately synchronize time of the master and slave stations so as to achieve accurate communication among those stations. According to this device and method in which timers of respective slave stations connected to a ring communication path are synchronized using a specific communication frame, a master station recognizes the number of slave stations and their connection sequences, and notifies each of the slave stations of an individual communication delay time. Respective slave stations correct their timers so as to agree to that of the master station.Type: GrantFiled: February 17, 1998Date of Patent: February 6, 2001Assignee: Okuma CorporationInventors: Toru Ando, Koji Eba
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Patent number: 5913053Abstract: A synchronous controller includes a command controller for outputting action commands to actuator controllers for synchronously controlling respective corresponding actuators. Each actuator controller includes an interrupt controller and a corresponding internal counter. One interrupt controller is designated as a master and the remaining interrupt controllers are designated as slaves. The master interrupt controller activates an interrupt signal on a bus based on the count value of its corresponding internal counter and resets the counter while the slave interrupt controllers concurrently reset their corresponding internal counters upon detecting the interrupt signal on the bus.Type: GrantFiled: September 5, 1997Date of Patent: June 15, 1999Assignee: Okuma CorporationInventors: Hideyuki Nonogaki, Koji Eba
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Patent number: 5101143Abstract: A spindle control system enables a gear change while a spindle is rotating by calculating the position of a motor shaft when gears are reengaged by a target position calculating circuit, and outputting speed commands for the motor shaft by a position control circuit based on the calculation result, and switching by a switching circuit so as to input the speed commands to a speed control circuit.Type: GrantFiled: September 24, 1990Date of Patent: March 31, 1992Assignee: Kabushiki Kaisha Okuma TekkoshoInventor: Koji Eba