Patents by Inventor Masahiro Ohto

Masahiro Ohto 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: 6684131
    Abstract: A robot controller capable of minimizing an increase in the tact time during work, reducing changes in joint axes of the robot, thereby providing the structure with long mechanical life. The robot controller i) stores a plurality of movement data formed of amount and time for movement; ii) checks whether a movement of a robot has acceleration exceeding a predetermined level by calculation on the basis of the stored movement data; iii) increases the time for movement of the corresponding movement data, the preceding and following data to the movement data, if the calculation indicates over-acceleration; and iv) controls the robot according to the time-increased movement data.
    Type: Grant
    Filed: June 25, 2002
    Date of Patent: January 27, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Atsumi Hashimoto, Takashi Nakatsuka, Masahiro Ohto
  • Patent number: 6570355
    Abstract: An object of the present invention is to provide a control apparatus for a robot in which the work efficiency is improved in the whole robot peripheral system including the robot, and in which considering the increase in the consciousness of safety such as the standardization of safety apparatuses, both the reliability of the safety circuit of the control apparatus for a robot and the ensuring of the safety are improved. By connecting, to peripheral devices outside the robot, each intermediate output signal line for extracting the operation signal or the emergency stop signal of each of the plurality of switches each assigned to a factor causing the stop of the robot, a factor to cause the stop of the robot body alone can be distinguished from a factor to cause the stop of both the robot body and the peripheral devices.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: May 27, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kunitoshi Morita, Kei Aimi, Masahiro Ohto, Kazunori Matsumoto, Takashi Nakatsuka
  • Publication number: 20030014156
    Abstract: A robot controller capable of minimizing an increase in the tact time during work, reducing changes in joint axes of the robot, thereby providing the structure with long mechanical life. The robot controller i) stores a plurality of movement data formed of amount and time for movement; ii) checks whether a movement of a robot has acceleration exceeding a predetermined level by calculation on the basis of the stored movement data; iii) increases the time for movement of the corresponding movement data, the preceding and following data to the movement data, if the calculation indicates over-acceleration; and iv) controls the robot according to the time-increased movement data.
    Type: Application
    Filed: June 25, 2002
    Publication date: January 16, 2003
    Inventors: Atsumi Hashimoto, Takashi Nakatsuka, Masahiro Ohto
  • Publication number: 20010027352
    Abstract: An object of the present invention is to provide a control apparatus for a robot in which the work efficiency is improved in the whole robot peripheral system including the robot, and in which considering the increase in the consciousness of safety such as the standardization of safety apparatuses, both the reliability of the safety circuit of the control apparatus for a robot and the ensuring of the safety are improved.
    Type: Application
    Filed: April 2, 2001
    Publication date: October 4, 2001
    Inventors: Kunitoshi Morita, Kei Aimi, Masahiro Ohto, Kazunori Matsumoto, Takashi Nakatsuka
  • Patent number: 5993044
    Abstract: An acceleration generated when a tool tip of a robot moves straightly or turns a teaching point inward, is suppressed under a predetermined maximum acceleration so that the tool tip moves smoothly.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: November 30, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masahiro Ohto, Hisashi Kinoshita, Takashi Nakatsuka, Yoshinori Nishida
  • Patent number: 5319294
    Abstract: An automatic offset adjusting apparatus for current detectors in a digital controller for a servo motor is constructed so that, when errors occur in offset correction values due to a temperature change and the like while the servo motor is in operation, an electrical angle detecting unit detects a ripple of the torque of the servo motor, on the basis of a ripple of a torque command value, and detects a first electrical angle, where the torque command value becomes maximum, and a second electrical angle, where the torque command value becomes minimum, based on an electrical angle signal of the servo motor, a judgement unit judges whether or not offset correction errors have occurred on the basis of a difference between the first and second electrical angles, and, if the judgement unit judges that the offset correction errors have occurred, a correction unit adds adjustment values for the offset correction values corresponding to the first electrical angle to the respective offset correction values to update th
    Type: Grant
    Filed: May 24, 1993
    Date of Patent: June 7, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masahiro Ohto, Hisashi Kinoshita, Nin Kake, Yoshihiro Ino