Cam Wheel Board Feeder Synchronization
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Solution Overview
Problem
Conventional transfer mechanisms for lumber processing struggle with high-speed operations, as they are limited by short activation times for moveable stops and cannot accommodate wide speed variations of conveyors with lugs, leading to inefficiencies in board spacing and timing during stops and starts.
Innovation Solution
A variable speed transfer mechanism featuring a cam wheel with adjustable speed drive, sensors for lug and conveyor speed detection, and a programmable control unit to independently control the cam wheel, allowing dynamic positioning and synchronization with the second conveyor's speed changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If moveable stops are used to hold back boards during high-speed operation, then board spacing can be maintained, but the activation time becomes too short to operate effectively
Solution Approach 1:
The invention extracts the timing control function from the mechanical moveable stop system and transfers it to a programmable control system that independently manages the cam wheel timing. This separates the board holding function (performed by fixed stops) from the timing control function (performed by the programmable controller), allowing high-speed operation without relying on short activation times of moveable stops.
Solution Approach 2:
The invention replaces the mechanical clutch arrangement with fixed engagement/disengagement positions with a programmable control system that uses sensors and variable speed control. The programmable controller adjusts the cam wheel speed and timing dynamically based on conveyor speed and phase requirements, eliminating the limitations of fixed mechanical positioning.
2Adaptability or versatility
If a mechanical clutch arrangement is used to stop the feed wheel, then board transfer can be controlled, but the fixed engagement/disengagement positions cannot accommodate wide speed variations
Solution Approach 1:
The invention makes the cam wheel speed dynamic through a variable speed drive controlled by a programmable controller. The cam wheel can accelerate and decelerate independently to match the speed variations of the lugged conveyor, allowing wide speed range adaptation. The system dynamically adjusts timing and speed rather than relying on fixed mechanical positions.
Solution Approach 2:
The invention changes the operational parameters of the cam wheel by controlling its speed and position through a variable speed drive. The programmable controller modifies the cam wheel's rotational speed and phase timing based on sensor feedback from the lugged conveyor, enabling adaptation to different speeds and phase requirements without mechanical reconfiguration.
3Measurement precision
If the cam wheel is controlled independently of the conveyors, then precise timing and speed adjustment are achieved, but the control system complexity increases
Solution Approach 1:
The invention implements feedback control by using sensors to detect the position and speed of the lugged conveyor, then feeding this information to the programmable controller. The controller uses this feedback to dynamically adjust the cam wheel's speed and timing, achieving precise synchronization. The feedback loop continuously monitors and corrects timing deviations, maintaining precision despite system complexity.
Data Source
AI summary
A transfer mechanism that transfers boards from a first conveyor onto a second conveyor having lugs using a stop, a cammed wheel for lifting boards over the stop, and a programmable computer controller for controlling the cammed wheel independent of the speed of the first and second conveyors.