Laser Engraving Head Position Feedback for Patch Alignment
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Solution Overview
Problem
Conventional laser-engraving systems rely on open-loop control techniques, which fail to adjust for position errors caused by thermal elongation, elastic deformation, and encoder delays, leading to edge discontinuities between adjacent patches during the laser-engraving process.
Innovation Solution
A computer-implemented method using closed-loop control systems that adjust the position of the laser-engraving head based on real-time position information from optical targets, allowing for precise alignment and compensation for position errors, thereby minimizing edge discontinuities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If open-loop control techniques are used in laser-engraving systems, then the system operation is simpler, but position errors occur due to thermal elongation, elastic deformation, and encoder delays
Solution Approach 1:
The patent implements closed-loop control by continuously measuring the actual position of the laser-engraving head using encoders and comparing it with the commanded position. The controller automatically calculates position errors and adjusts motor commands in real-time to compensate for thermal elongation, elastic deformation, and encoder delays, thereby maintaining high position accuracy while preserving ease of operation through automated correction
Solution Approach 2:
The patent replaces purely mechanical open-loop positioning with an integrated electromechanical control system that uses electronic sensors (encoders), electronic controllers, and automated feedback loops to supplement and correct mechanical positioning, thereby eliminating position errors without complicating the mechanical structure
2Device complexity
If conventional positioning methods are used, then the device complexity is lower, but edge discontinuities occur between adjacent patches
Solution Approach 1:
The patent uses real-time position feedback from encoders on both the laser-engraving head and workpiece to detect actual positions, compares them with commanded positions, and automatically adjusts for deviations. This closed-loop control ensures precise alignment between adjacent patches by compensating for positioning errors as they occur, eliminating edge discontinuities without requiring overly complex mechanical structures
Solution Approach 2:
The patent performs preliminary positioning of the laser-engraving head and workpiece using the controller, which calculates required adjustments based on predetermined patch boundaries and alignment requirements. Before actual engraving begins, the system pre-adjusts positions to account for expected thermal elongation and elastic deformation, ensuring seamless patch transitions
3Manufacturing precision
If real-time position compensation is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent implements closed-loop control using encoders that provide real-time position feedback to the controller. The controller automatically processes this feedback, calculates position errors, and generates correction commands without requiring complex external measurement systems or manual intervention, thereby achieving high manufacturing precision with moderate control system complexity
Solution Approach 2:
The system performs self-correction of position errors through automated feedback loops. The controller continuously monitors actual positions via encoders, detects deviations from commanded positions, and automatically adjusts motor commands to compensate for thermal elongation, elastic deformation, and encoder delays, eliminating the need for complex external calibration or adjustment mechanisms
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 method effectively reduces edge discontinuities by compensating for thermal elongation, elastic deformation, and encoder delays, ensuring accurate alignment and preventing micron-scale errors between patches during the laser-engraving process.
Implementation Method 1
receiving first position information associated with a first optical signal transmitted from a first optical target coupled to the workpiece; receiving second position information associated with a second optical signal transmitted from a second optical target coupled to the end effector
Data Source
AI summary
A computer-implemented method for positioning a workpiece for a computer numerical controlled (CNC) process includes: causing a positioner to move an end effector to an initial position; receiving first position information associated with a first optical signal transmitted from a first optical target coupled to the workpiece; receiving second position information associated with a second optical signal transmitted from a second optical target coupled to the end effector; determining an offset between the initial position and a target position for the end effector based on the first position information and the second position information; and causing the positioner to move the end effector to a final position based on the offset.