Patents Examined by George H. Muller, Jr.
  • 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