Patents by Inventor Leo Dobrjanskyj

Leo Dobrjanskyj 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).

  • Electronic control of needle thread in a sewing machine
    Patent number: 4215641
    Abstract: A sewing machine is provided with an actuator controlled thread take-up lever. A microprocessor is programmed to provide signals for controlling the actuator to provide a system wherein the interaction of the needle, the needle thread take-up and needle thread tension are optimally controlled. A thread metering mechanism, also under microprocessor control, is included in the system.
    Type: Grant
    Filed: July 5, 1979
    Date of Patent: August 5, 1980
    Assignee: The Singer Company
    Inventors: Leo Dobrjanskyj, Donald R. Simon
  • Skipped stitch detection system
    Patent number: 4170951
    Abstract: A skipped stitch detection system for a sewing machine is provided with a strain gage mounted on the slack thread regulator. The strain gage is connected in a Wheatstone bridge configuration. An amplified output from the Wheatstone bridge and timing signals from the sewing machine are provided to a microprocessor which analyzes the thread tension profile to detect the occurrence of a skipped stitch.
    Type: Grant
    Filed: December 14, 1978
    Date of Patent: October 16, 1979
    Assignee: The Singer Company
    Inventor: Leo Dobrjanskyj