Patents by Inventor Hironao Yamada

Hironao Yamada 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).

  • Table feed system
    Patent number: 6626082
    Abstract: In a machine tool by pulse drive of a hydraulic system, a piston of a hydraulic cylinder is connected with a table, and an outflow valve and an inflow valve, which form a pair, are respectively connected with a right and a left hydraulic chamber. When the feed table is moved to the right, for example, control is conducted so that the valve-opening period of one valve can be a portion in the middle of the valve-opening period of the other valve. Since a portion of pressure in the hydraulic chamber is canceled, an effective pressure, the pulse width of which is narrow, remains. Accordingly, even in the case where a common inexpensive electromagnetic valve is used, it is possible to accomplish a smooth feed motion.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: September 30, 2003
    Assignee: Denso Corporation
    Inventors: Hiromichi Morita, Goshin Ohashi, Sojiro Tsuchiya, Hisatoshi Kojima, Takayoshi Muto, Hironao Yamada
  • Table feed system
    Publication number: 20020026869
    Abstract: In a machine tool by pulse drive of a hydraulic system, a piston of a hydraulic cylinder is connected with a table, and an outflow valve and an inflow valve, which form a pair, are respectively connected with a right and a left hydraulic chamber. When the feed table is moved to the right, for example, control is conducted so that the valve-opening period of one valve can be a portion in the middle of the valve-opening period of the other valve. Since a portion of pressure in the hydraulic chamber is canceled, an effective pressure, the pulse width of which is narrow, remains. Accordingly, even in the case where a common inexpensive electromagnetic valve is used, it is possible to accomplish a smooth feed motion.
    Type: Application
    Filed: August 30, 2001
    Publication date: March 7, 2002
    Inventors: Hiromichi Morita, Goshin Ohashi, Sojiro Tsuchiya, Hisatoshi Kojima, Takayoshi Muto, Hironao Yamada