Bandsaw Blade Backlighting Control for Accurate Edge Positioning
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Solution Overview
Problem
Existing systems for monitoring and controlling the position of bandsaw blades in cutting machines are plagued by inaccuracies due to the angle of the bandsaw blade and its position relative to the camera, affecting the quality of cutting and the longevity of the blade.
Innovation Solution
A monitoring system that uses a light source with a diffusing member to project light on one side of the bandsaw blade, capturing images from the opposite side to determine the cutting edge's position, and a processing structure to adjust the blade's position automatically using a tilt assembly, ensuring accurate measurements and preventing premature wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reflected light is used to measure the position of the bandsaw blade, then the measurement system is simple, but the measurement accuracy deteriorates due to blade angle and camera position variations
Solution Approach 1:
The patent inverts the traditional reflected light measurement approach by using transmitted light instead. The light source is positioned behind the blade, and the camera captures the blade silhouette against the light source, eliminating the problems of reflected light angle dependence and improving measurement accuracy.
Solution Approach 2:
The patent introduces a light source as an intermediary between the blade and camera. This light source creates a backlighting effect that enhances the contrast of the blade silhouette, making the blade edge more distinct and improving measurement precision regardless of blade angle or camera position.
2Device complexity
If inductive proximity sensors are used for blade position detection, then the system structure is simple, but measurement accuracy deteriorates affecting cutting quality
Solution Approach 1:
The patent replaces mechanical/inductive sensors with an optical measurement system. By using a light source and camera to capture blade silhouette images, the system achieves higher measurement accuracy without the limitations of inductive proximity sensors, while maintaining relatively simple system structure.
3Duration of action of moving object
If the bandsaw blade is not positioned accurately, then the blade life decreases due to premature wear, but maintaining accurate position requires complex monitoring and control systems
Solution Approach 1:
The patent implements an automated monitoring and control system that self-adjusts the blade position. The system continuously captures blade position images, processes them to determine blade location, and automatically adjusts the blade position through motorized mechanisms, eliminating the need for manual intervention and ensuring consistent accurate positioning throughout blade operation.
Solution Approach 2:
The patent establishes a closed-loop feedback system where blade position is continuously monitored through optical imaging, processed to determine position accuracy, and used to automatically adjust the blade position. This feedback mechanism ensures the blade maintains optimal positioning throughout its operational life, maximizing blade life while keeping the control system manageable through automation.
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
The system provides accurate and efficient monitoring and control of the bandsaw blade's position, reducing inaccuracies and extending blade life by automatically adjusting the blade to its optimal working position, thereby improving cutting quality and preventing catastrophic failures.
Implementation Method 1
The light source projects light on the first side of the bandsaw blade. The imaging device looks at the second side of the bandsaw blade and captures images of the bandsaw blade under the back light of the light source.
Implementation Method 2
the light source further comprises a diffusing member such as a strip of ultra high molecular weight polyethylene (UHMW) plastic placed in front of the light source to diffuse the light from the light source
Data Source
AI summary
A system and method for monitoring and controlling the position of a bandsaw blade of a cutting machine used in sawmills are provided. The system comprises a light source, an imaging device and a processing structure for processing images captured by the imaging device and controlling the adjustment of the position of the bandsaw blade. The light source projects diffused light on a first side of the bandsaw blade through a diffuser member and the imaging device looks at a second side of the bandsaw blade. Each image captured by the imaging device shows a boundary line between a light area and a dark area, which represents the position of the cutting edge of the bandsaw blade. The position of the bandsaw blade then can be monitored and controlled for adjustment to its ideal position based on the measurement of the boundary line.