Patents by Inventor Junkichi Comikawa

Junkichi Comikawa 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: 6128987
    Abstract: A hydraulic press has closed loop feedback control on a slide, a slide pad and bolster cylinders. Hydraulic cylinders actuating various components of the press are controlled according to ideal position estimates to produce consistent and precise pressing action. A closed loop control consists of an ideal position/pressure value generator, a position/pressure detector and an arithmetic unit comparing the ideal and actual position/pressure values. Using the ideal and actual comparison result, the arithmetic unit produces a control signal to drive a cylinder to a desired position/pressure. The hydraulic press is capable of performing several operations on a workpiece in one press cycle, an improvement over presses requiring several operation steps or die changes. The bolster cylinders augment clamping force, reduce shock, and improve die alignment to produce better results with less wear on press components.
    Type: Grant
    Filed: February 19, 1998
    Date of Patent: October 10, 2000
    Assignee: Aida Engineering Co., Ltd.
    Inventors: Tatsuji Nakagawa, Itaru Fujimura, Hiroshi Hosoya, Junkichi Comikawa, Kazuhiko Fujimoto