Patents by Inventor Yasuhiro Tabata

Yasuhiro Tabata 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: 4187024
    Abstract: First and second original documents are copied on the opposite sides of a copy sheet in superposition in such a manner that the centers of the two copied images on the opposite sides of the copy sheet are coincident with each other. The two copied images are offset from the center of the copy sheet, leaving a blank area at one edge of the copy sheet for binding a number of copy sheets together in book form. The present copying machine is further provided with two sheet cassettes containing copy sheets of different sizes, means for selecting the desired copy sheet size and intermediate sheet holder means for temporarily holding the selected copy sheet between the copy operations of the first and second original documents.
    Type: Grant
    Filed: March 7, 1978
    Date of Patent: February 5, 1980
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyokazu Satomi, Yutaka Koizumi, Isao Nakamura, Yasuhiro Tabata, Tamaki Kaneko
  • Patent number: 4178093
    Abstract: A horizontal platen is translatable through a first exposure position above a photoconductive drum for supporting bulky original documents such as books. A first focussing optical fiber array is disposed between the first exposure position and the drum. A sheet feed mechanism is provided at a second exposure position for feedingly scanning original documents in the form of sheets. The second exposure position is on a circle concentric with the first exposure position and a second focussing optical fiber array is disposed between the second exposure position and the drum. The sheet feed mechanism is located below the platen. A directed light source is movable to selectively direct light to the first or second exposure position. In one form of the invention only one focussing optical fiber array is provided which is movable between the first exposure position and the drum or between the second exposure position and the drum.
    Type: Grant
    Filed: November 28, 1977
    Date of Patent: December 11, 1979
    Assignee: Ricoh Company, Ltd.
    Inventors: Nobuyuki Yanagawa, Yasuhiro Tabata
  • Patent number: 4173410
    Abstract: In the method, two originals are placed side-by-side on the contact glass of an electrophotographic duplex copying machine and are scanned successively, in a single scanning operation, by the exposure optical system of the machine to form respective successive images on a photoconductive drum rotated past an image transfer device. Two transfer sheets are fed successively, with a short interval therebetween, from a primary supply device for transfer sheets, past the image transfer device in synchronism with the image formation on the drum, to provide duplex copies, having images in the same relation as that of the two originals, in a single copying cycle or process. By utilizing a secondary sheet supply device and a suitable switching device, images can be provided on both sides or surfaces of a transfer sheet or sheets. The duplex copying apparatus includes a novel sheet feed device effective to stack transfer sheets neatly.
    Type: Grant
    Filed: January 26, 1978
    Date of Patent: November 6, 1979
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhiro Tabata, Toyokazu Satomi, Yutaka Koizumi, Isao Nakamura, Tamaki Kaneko
  • Patent number: 4142792
    Abstract: A large number of copies of a small original document such as a card are made quickly by forming electrostatic images of the document circumferentially spaced from each other on the periphery of a rotating photoconductive drum. The electrostatic images are repeatedly developed and the resulting toner images are transferred to respective copy sheets to form copies. In this manner, a number of copies equal to the number of electrostatic images on the drum are produced for each revolution of the drum. However, due to unavoidable discharge of the electrostatic images the same can only be developed a predetermined number of times if acceptable copies are to be produced. The present apparatus therefore comprises an automatic means for forming new electrostatic images when the original electrostatic images have been developed the predetermined number of times. The automatic means may be in the form of a counter, a timer or a voltage sensor.
    Type: Grant
    Filed: February 10, 1977
    Date of Patent: March 6, 1979
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyokazu Satomi, Yasuhiro Tabata
  • Patent number: 4110025
    Abstract: A chain rotates adjacent to and at the same speed as a photoconductive drum and first and second clamps fixed to the chain grip the edges of copy sheets to move the copy sheets in synchronized contact with the drum for toner image transfer from the drum to the sheets. The first clamp grips an edge of a copy sheet for transfer of an image to the front side of the copy sheet. A turnover actuator and feed roller pair then release the first clamp and move the copy sheet away from the chain. As the second clamp approaches the actuator, it is opened thereby and the feed roller pair feeds the copy sheet back toward the chain so that the opposite edge of the copy sheet is gripped by the second clamp. The copy sheet is thereby turned over and conveyed by the chain to the drum for transfer of a toner image to the back side thereof.
    Type: Grant
    Filed: September 15, 1976
    Date of Patent: August 29, 1978
    Assignee: Ricoh Company, Ltd.
    Inventor: Yasuhiro Tabata
  • Patent number: 4015892
    Abstract: The optical system is adapted for use in a copying machine. At least three reflecting mirrors are used for slitwise scanning and successively reflecting an image of a material, to be copied, placed on a stationary transparent pane, onto a stationary focusing lens. The intermediate or second mirror is disposed stationary adjacent to one of the opposite ends of the pane, whereas the first and third mirrors are moved along respective paths at respective rates in a predetermined relation but in respective directions of movement. This arrangement permits the movable mirrors to effect their functions without overrunning the limits defined by the opposite ends of the pane, thereby resulting in a compact or reduced size construction of the machine.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: April 5, 1977
    Assignee: Ricoh Co., Ltd.
    Inventor: Yasuhiro Tabata