Lumber Edger Servo Positioning System
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Solution Overview
Problem
Hydraulic systems in lumber edgers face issues such as fire risks, EPA regulations, overheating, high horsepower requirements, maintenance problems, and constant leaks, making them undesirable in sawmill settings.
Innovation Solution
The use of electric servo drives and servo motors to replace conventional hydraulic positioning systems, with positioning devices mounted on rails with linear bearings and driven by cogged belts or chains, featuring rotating fetcher fingers and encoder feedback for precise positioning, and the option to retrofit existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic positioning systems are used in lumber edgers, then positioning capability is achieved, but fire risks, EPA regulations violations, overheating, high horsepower requirements, maintenance problems, and constant leaks occur
Solution Approach 1:
The patent replaces hydraulic positioning systems with electric servo drives and servo motors. This substitution eliminates hydraulic fluid leaks, fire risks, and overheating problems while maintaining precise positioning capability through electronic control and feedback mechanisms.
Solution Approach 2:
The patent removes the hydraulic system entirely from the lumber edger positioning mechanism and extracts only the necessary positioning function, implementing it through electric servo technology. This eliminates all harmful factors associated with hydraulic fluid while preserving the core positioning capability.
2Ease of operation
If hydraulic positioning systems are used, then positioning function is provided, but high horsepower requirements and maintenance problems arise
Solution Approach 1:
The patent substitutes hydraulic actuators with electric servo motors that provide equivalent positioning force with significantly lower power consumption. The servo technology enables precise control with reduced energy requirements compared to hydraulic systems.
3Reliability
If hydraulic positioning systems are used, then positioning capability is achieved, but constant leaks and maintenance problems occur
Solution Approach 1:
The patent replaces hydraulic components with electric servo drives that have no hydraulic fluid, seals, or hoses to leak. This substitution dramatically reduces maintenance requirements while maintaining positioning capability through electronic feedback and control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances positioning speed and reliability, reduces maintenance, and eliminates the drawbacks of hydraulic systems, allowing for efficient and accurate skewing and translation of lumber for optimal cutting, while being compatible with existing edger systems.
Implementation Method 1
The servo motor can drive the device in and out
Implementation Method 2
encoders (on the back of the servo drive and on the cogged belt sheave) would feed back the position to the control system
Implementation Method 3
mounted on a rail with linear bearings
Implementation Method 4
driven in and out (from the edger feed table or conveyor) with a cogged belt
Data Source
AI summary
A lumber edger and method of edging lumber using a positioning system having a plurality fetcher fingers driven by a non-hydraulic drive.