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:
Nov. 16, 1976
Filed:
Nov. 29, 1974
Jack Buss, Federal Way, WA (US);
Pre-Con, Inc., Mercer Island, WA (US);
Abstract
A system for controlling the spacing between a plurality of saw blades. Precise control is insured by cascading an electrical feedback system in series with a mechanical feedback system. The electrical feedback system includes a position register for recording the actual location of each saw blade, a command register for recording the desired position of each saw blade, a comparator for generating an error signal corresponding to the difference between the actual and desired saw positions, and a stepper motor responsive to the error signal. The stepper motor drives a control shaft having a shaft encoder secured thereto which feeds pulses back to increment or decrement the position register, thereby synchronizing the contents of the position register to the actual position of the stepper motor. The mechanical feedback system includes a hydraulic cylinder for controlling the position of the saw, a feedback shaft having an angular position determined by the position of the saw, and a hydraulic servo valve which actuates the hydraulic cylinder in either direction, depending on the relative position between the feedback shaft and the control shaft.