Patents by Inventor Tsuen-Pann Shieh

Tsuen-Pann Shieh 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).

  • Method and apparatus for optimal feedrate control on wire-cutting electric discharging machine (WEDM)
    Patent number: 5689427
    Abstract: Disclosed is a feedrate controlling method and apparatus for controlling a wire-cutting electric discharging machine (WEDM) to operate at optimal feedrate. In the apparatus, a discharge frequency counter is used to count the frequency of normal discharge and the frequency of abnormal discharge, from which two performance indexes: stability percent (STB) and efficiency percent (EFF) are obtained. These two performance indexes allow the apparatus to use a decision table to obtain an optimal feedrate variation used to change the current feedrate so as to operate the WEDM with maximum stability and efficiency.
    Type: Grant
    Filed: September 1, 1995
    Date of Patent: November 18, 1997
    Assignee: Industrial Technology Research Institute
    Inventors: Hsi-Pin Li, Hsin-Jung Chuang, Tsuen-Pann Shieh