Patents by Inventor Tukasa Tajima

Tukasa Tajima 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).

  • Powder molding press
    Patent number: 5498147
    Abstract: A powder molding press a die plate provided with a die having a die hole, a punch device to be inserted into the die hole and a hydraulic cylinder device attached to the punch device for driving the same, the hydraulic cylinder device being arranged coaxially with the punch device. A movable punch plate may be disposed on one side of the die plate in parallel thereto with a predetermined space and a punch adapter for securing the punch device to the punch plate may be also disposed. The punch device includes a plurality of punches disposed axially in series.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: March 12, 1996
    Assignee: Yoshizuka Seiki Co., Ltd.
    Inventors: Takeshi Katagiri, Masao Yamamoto, Tukasa Tajima, Siro Shirasaki
  • Powder molding press
    Patent number: 5326242
    Abstract: A powder molding press includes a die plate provided with a die having a die hole, a punch device to be inserted into the die hole and a hydraulic cylinder device attached to the punch device for driving the same, the hydraulic cylinder device being arranged coaxially with the punch device. A movable punch plate may be disposed on one side of the die plate in parallel thereto with a predetermined space and a punch adapter for securing the punch device to the punch plate may be also disposed. The punch device includes a plurality of punches disposed axially in series.
    Type: Grant
    Filed: August 9, 1991
    Date of Patent: July 5, 1994
    Assignee: Yoshizuka Seiki Co., Ltd.
    Inventors: Takeshi Katagiri, Masao Yamamoto, Tukasa Tajima, Siro Shirasaki
  • Method and apparatus for controlling powder molding press
    Patent number: 5288440
    Abstract: A power molding press is controlled, in which a stepped mold product having a plurality of stepped portions is molded by compressing powder within a mold by relatively moving an upper punch assembly, a lower punch assembly including a plurality of lower punches arranged concentrically with each other and the mold by detecting a speed ratio of moving speeds of the upper and lower punch assemblies moved by the respective driving sources at a time of compressing the respective stepped portions of the mold product during a compressing time from a pressing start time to a pressing completion time, detecting positions of the upper and lower punch assemblies and the mold, detecting a compression ratio of compressed dimensions of the stepped portions of the mold product, and controlling the respective drive sources to control the relative moving speeds of the upper punch assembly, the lower punch assembly and the mold so that the speed ratios substantially accord with the compression ratios of the respective stepped
    Type: Grant
    Filed: February 4, 1992
    Date of Patent: February 22, 1994
    Assignee: Yoshizuka Seiki Co., Ltd.
    Inventors: Takeshi Katagiri, Masao Yamamoto, Tukasa Tajima, Siro Sirasaki