Patents Assigned to Tokkyo Kiki Kabushiki Kaisha
  • Active control precision damping table
    Patent number: 5180958
    Abstract: An active control precision damping table supported by air springs. Level displacement and vibrations of the table are detected by a sensor or sensors, and sensor outputs are fed to a variation adder which carries out an adding operation on one of the sensor outputs and an inversion signal produced by inverting the other sensor output 180 degrees. The adder outputs results of the operation to a drive circuit, which in turn outputs a drive signal to a control valve. The control valve is operable in response to the drive signal to adjust air pressure in pressure vessels of the air springs.
    Type: Grant
    Filed: April 3, 1991
    Date of Patent: January 19, 1993
    Assignee: Tokkyo Kiki Kabushiki Kaisha
    Inventors: Hitoshi Choshitani, Takahide Osaka, Fumiaki Itojima, Masashi Yasuda
  • Variation control circuit having a displacement detecting function
    Patent number: 5179516
    Abstract: An active control precision damping table supported by air springs. Level displacement and vibrations of the table are detected by a sensor or sensors, and sensor outputs are fed to a variation adder which carries out an adding operation on one of the sensor outputs and an inversion signal produced by inverting the other sensor output 180 degrees. The adder outputs results of the operation to a drive circuit, which in turn outputs a drive signal to a control valve. The control valve is operable in response to the drive signal to adjust air pressure in pressure vessels of the air springs.
    Type: Grant
    Filed: April 3, 1991
    Date of Patent: January 12, 1993
    Assignee: Tokkyo Kiki Kabushiki Kaisha
    Inventors: Hitoshi Choshitani, Takahide Osaka, Fumiaki Itojima, Masashi Yasuda
  • Method of controlling positions and vibrations and active vibration control apparatus therefor
    Patent number: 5121898
    Abstract: A method of controlling level lateral positions of a vibration control base suspended by air springs to be returned to its standard level and lateral positions and to keep their positions by utilizing analog integration or a feedback compensation in combination thereto so as to control an air pressure or air pressures of air springs for driving the vibration control base and also controlling vertical and horizontal vibrations of the vibration control base and an apparatus for carrying out the said method.
    Type: Grant
    Filed: July 24, 1990
    Date of Patent: June 16, 1992
    Assignee: Tokkyo Kiki Kabushiki Kaisha
    Inventors: Masashi Yasuda, Fumiaki Itojima
  • Active control precision damping table
    Patent number: 5060519
    Abstract: An active control precision damping table supported by air springs. Level displacement and vibrations of the table are detected by a sensor or sensors, and sensor outputs are fed to a variation adder which carries out an adding operation on one of the sensor outputs and an inversion signal produced by inverting the other sensor output 180 degrees. The adder outputs results of the operation to a drive circuit, which in turn outputs a drive signal to a control valve. The control valve is operable in response to the drive signal to adjust air pressure in pressure vessels of the air springs.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: October 29, 1991
    Assignee: Tokkyo Kiki Kabushiki Kaisha
    Inventors: Hitoshi Chojitani, Takahide Osaka, Fumiaki Itojima, Masashi Yasuda