Patents by Inventor Akio Tsujita

Akio Tsujita 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: 6144836
    Abstract: A transport roll 1 consists of a metal roll 3 of 40 mm in diameter covered with a conductive PFA tube 2 of 10.sup.10 .OMEGA.cm in volume resistivity and 200 .mu.m in thickness. A DC voltage source 4 is connected to the metal roll. A sheet of paper 5 bearing toner images 6 and 7 on both sides thereof receives a drive force from a paper drive roll, and turns with the movement of the paper. The DC voltage source produces voltage VB1 of the same polarity as the charging polarity (positive) of the toner image 6 being in contact with the transport roll. The voltage VB1 is optimumly controlled so as to prevent the transport roll from being soiled with toner.
    Type: Grant
    Filed: September 9, 1997
    Date of Patent: November 7, 2000
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Takao Umeda, Akio Tsujita, Takashi Rokutanda, Yukio Otome
  • Patent number: 5908590
    Abstract: The present invention provides a process and apparatus for readily and continuously producing foamed resin containers with labels by following a process sequence including the steps of supplying a sheet which bears label bodies printed in predetermined positions thereon, positioning a label body, punching the label body, and molding a foamed resin container with the label properly positioned. The invention further provides a process which allows for precise positioning of a label. Therefore, a thin and less stiff synthetic resin sheet can be employed for the label instead of a paper base. In addition, the label can be applied in a predetermined position on the foamed resin container without preliminarily rolling the label into a predetermined tubular shape.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: June 1, 1999
    Assignees: Sekisui Plastics Co., Ltd., Nissin Food Products Co., Ltd.
    Inventors: Toru Yoshimi, Hiroshi Hasegawa, Yasuhiro Ono, Akio Tsujita, Hirotomo Iwasaki, Masaru Chiba
  • Patent number: 5701560
    Abstract: In an image forming apparatus forming an electrostatic latent image on a surface of a photosensitive body by exposing the charged photosensitive body, developing the latent image using a toner to form a toner image, transferring the toner image to a image holding body, and erasing the remaining charge on the surface of the photosensitive body after completion of the transferring, the photosensitive body is formed of a base material consisting of As.sub.2 Se.sub.3 or a-Si, and wherein the wavelength .lambda..sub.0 of the writing light used for the exposure is limited to a wavelength not larger than 780 nm, the wavelength .lambda..sub.1 of charge erasing light used for the charge erasing is limited to a wavelength smaller than 680 nm, and the time T.sub.1 from completion of the exposure to initiation of the development is limited within the range of 70 milliseconds to 300 milliseconds.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: December 23, 1997
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Akio Tsujita, Masayasu Anzai, Tsuneaki Kawanishi
  • Patent number: 5005051
    Abstract: An electrophotographic recording apparatus using an amorphous silicon hydride photosensitive drum for recording images through processes comprising uniformly charging the drum, exposing the drum to light to form a latent image thereon, developing the latent image and transferring the developed image onto a recording medium wherein the charging and transferring processes are implemented by corona dischargers. To prevent pale or blurred image recording which occurs when the image recording is resumed after expiration of a long period of time, a shielding means is provided in association with each of the corona dischargers for shielding the corona discharger to interrupt atmospheric contact with the peripheral surface of the photosensitive drum.
    Type: Grant
    Filed: March 26, 1990
    Date of Patent: April 2, 1991
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Shinichi Haruki, Yhuzi Furuya, Akio Tsujita