Patents by Inventor Keizo Akamatsu

Keizo Akamatsu 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).

  • Servo controlling device and method
    Patent number: 7050862
    Abstract: When a position/speed feedback changes while a control system for driving a feed axis uses an integration gain during a shaft stopping, the control system goes unstable to cause a torque instruction to vibrate or diverge. In addition, only a single, narrow-range feed speed can be accommodated to find an out-of-range speed to be insufficient or excessive in compensation effects. After detecting the movement reversal of a feed axis, a control loop is modeled, a virtual internal model computing unit (21) using a constant separate from a constant used in a control loop is configured, a virtual torque instruction (22) computed by this computing unit (21) is added to a torque instruction (16) for driving the feed axis, this adding is terminated when the virtual torque instruction (22) reaches a specified value, and a value (25) of an integrator in a virtual internal model at the adding termination is added to the integrator (14) corresponding to a position/speed feedback loop.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: May 23, 2006
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Keizo Akamatsu, Kazuhiro Tsuruta
  • Servo controlling device and method
    Publication number: 20030139824
    Abstract: When a position/speed feedback changes while a control system for driving a feed axis uses an integration gain during a shaft stopping, the control system goes unstable to cause a torque instruction to vibrate or diverge. In addition, only a single, narrow-range feed speed can be accommodated to find an out-of-range speed to be insufficient or excessive in compensation effects. After detecting the movement reversal of a feed axis, a control loop is modeled, a virtual internal model computing unit (21) using a constant separate from a constant used in a control loop is configured, a virtual torque instruction (22) computed by this computing unit (21) is added to a torque instruction (16) for driving the feed axis, this adding is terminated when the virtual torque instruction (22) reaches a specified value, and a value (25) of an integrator in a virtual internal model at the adding termination is added to the integrator (14) corresponding to a position/speed feedback loop.
    Type: Application
    Filed: December 31, 2002
    Publication date: July 24, 2003
    Inventors: Keizo Akamatsu, Kazuhiro Tsuruta
  • Method of knitting a knitwear forming therein a connecting part
    Patent number: 6138482
    Abstract: A knitting method that can permit the forming of a connecting part of the knitting fabric overlapped in front and back, such as a pleat or fly, even when the knitting fabric is knitted in a double jersey stitch structure.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: October 31, 2000
    Assignee: Shima Seiki Manufacturing Limited
    Inventors: Masahiro Shima, Keizo Akamatsu, Yoshinori Shimasaki