The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 1978
Filed:
Sep. 08, 1975
Robert F Obear, Rolling Hills Estates, CA (US);
Bruno A Rist, Northridge, CA (US);
Western Gear Corporation, Everett, WA (US);
Abstract
A rotary cutting blade control system which automatically varies the feed rate to maintain a constant material removal rate. The system senses the current in an electric motor driving the cutting blade and automatically adjusts the feed rate to maintain the motor current constant. The system adjusts a hydraulic valve in the hydraulic system operating the blade support to move the blade in or out whenever the current deviates from a standard which is set by the operator. The control system also includes a circuit for detecting when the load on the blade has dropped below a preset level indicating that the blade has completed the cut and automatically commands the hydraulic system to return the blade to a start position. An additional control circuit operating in conjunction with the no-load sensing circuit automatically produces a command to stop the blade close to the work piece to save time and motion when multiple cuts are being performed. This circuit operates by establishing a reference level indicating the position of the blade at the start of a cut.