Patents by Inventor Takuma Yasuo

Takuma Yasuo 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: 5291228
    Abstract: In an image formation apparatus, a drum tuck prevention element prevents a cut paper, which is a transfer material, which is an image holding means, from being wound on a photosensitive drum with an electrostatic state. The drum tuck prevention element detects, according to various physical information, the occurrence of a drum tuck. The drum tuck prevent element includes a tuck estimation judgment element which produces drum tuck prevention control information in response to the physical information. The physical information can be selected from a digital data for exposing the drum, temperature and humidity data obtained by detection in an area surrounding of an apparatus main body, data for indicating a residual amount of a development element, data for detecting an electrostatic latent image formed on the drum and data for indicating a visual image formed on a surface of the drum.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: March 1, 1994
    Assignees: Hitachi, Ltd., Hitachi Koki Co., Ltd.
    Inventors: Nagata Tetsuya, Umeda Takao, Takuma Yasuo, Igawa Tatsuo, Yamada Masato