Patents by Inventor Juha Herrala

Juha Herrala 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).

  • Control system for a paper or board machine
    Patent number: 5381341
    Abstract: A control system regulating the transverse profile of properties of a web in a paper or board machine is disclosed. The control system comprises a plurality of actuators and a corresponding plurality of actuator controllers. The actuators are arranged to be effective across the width of the web whose profile is to be regulated. Further included is a process controller and a feedback network connected to the process controller and provided with an arrangement for measuring the web profile to be regulated. The actuators are provided with intelligent actuator controllers. A data bus common to the actuator controllers is provided, along which occur data communications in a control hierarchy between a higher control device and said actuator controllers.
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: January 10, 1995
    Assignee: Valmet Paper Machinery Incorporated
    Inventors: Juha Herrala, Jouko Hytonen, Jarmo Jarvinen, Markku Salmela, Harri Vahatalo