Patents by Inventor Yee C. Chak

Yee C. Chak 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).

  • Strapping machine having primary and secondary tensioning units and a control system therefor
    Patent number: 6038967
    Abstract: A strapping machine and method for applying flexible heat-sealable straps around objects includes a programmable control system that receives encoder and other signals from various sensors in the machine to regulate each strapping cycle. A feed/tension unit provides primary tensioning of the strap about the object based on signals from the control system. A motor driven roller and a pinch roller in the feed/tension unit each providing separate encoder signals to the control system to assist the control system in advancing and retracting the strap during feed and tensioning sequences, respectively, and provide signals indicating an exact position of the strap. A secondary tension system provides a final high tensioning force on the strap. The control system can automatically adjust individual strapping cycles, including tensioning, to compensate for various size bundles and different types of objects. Thereafter, a sealing head heat seals the strap and severs the sealed strap from the remaining strap coil.
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: March 21, 2000
    Assignee: Ovalstrapping, Inc.
    Inventors: Yee C. Chak, Bryan R. Dierick, Gary L. Hylton
  • Strapping machine having primary and secondary tensioning units and a control system therefor
    Patent number: 5809873
    Abstract: A strapping machine and method for applying flexible heat-sealable straps around objects includes a programmable control system that receives encoder and other signals from various sensors in the machine to regulate each strapping cycle. A feed/tension unit provides primary tensioning of the strap about the object based on signals from the control system. A motor driven roller and a pinch roller in the feed/tension unit each providing separate encoder signals to the control system to assist the control system in advancing and retracting the strap during feed and tensioning sequences, respectively, and provide signals indicating an exact position of the strap. A secondary tension system provides a final high tensioning force on the strap. The control system can automatically adjust individual strapping cycles, including tensioning, to compensate for various size bundles and different types of objects. Thereafter, a sealing head heat seals the strap, and severs the sealed strap from the remaining strap coil.
    Type: Grant
    Filed: November 18, 1996
    Date of Patent: September 22, 1998
    Assignee: Ovalstrapping, Inc.
    Inventors: Yee C. Chak, Bryan R. Dierick, Gary L. Hylton