Patents by Inventor Naoya Ikawa

Naoya Ikawa 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).

  • Thread tension adjusting apparatus for a sewing machine
    Patent number: 5299517
    Abstract: A thread tension adjusting apparatus, used in a sewing machine, adjusts tension of a supplied thread by adjusting a thread holding force. The apparatus is provided on a thread supply path running from a thread source to a thread processing section such as a needle and a looper. The thread tension adjusting apparatus comprises a pair of members respectively having portions opposed to each other. At least one of the members is a piezoelectric actuator for changing a distance between the portions when being driven, whereby to adjust a thread holding force.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: April 5, 1994
    Assignee: Pegasus Sewing Machine Mfg. Co., Ltd.
    Inventor: Naoya Ikawa
  • Thread tension adjusting apparatus for a sewing machine
    Patent number: 5186114
    Abstract: A thread tension adjusting apparatus, used in a sewing machine, adjusts tension of a supplied thread by adjusting a thread holding force. The apparatus is provided on a thread supply path running from a thread source to a thread processing section such as a needle and a looper. The thread tension adjusting apparatus comprises a pair of members respectively having portions opposed to each other. At least one of the members is a piezoelectric actuator for changing a distance between the portions when being driven, whereby to adjust a thread holding force.
    Type: Grant
    Filed: April 17, 1991
    Date of Patent: February 16, 1993
    Assignee: Pegasus Sewing Machine Mfg. Co., Ltd.
    Inventor: Naoya Ikawa