Eccentric Shaft Yawing Correction Mechanism
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Solution Overview
Problem
Conventional methods for correcting yawing of conveyed workpieces during manufacturing, such as in thin-film solar cell production, are inadequate for high-speed processing as they require time-consuming position corrections, which hinder precision and processing speed.
Innovation Solution
A yawing correcting mechanism using a holding device and a running device with eccentric shafts that support the holding device at the front and rear, allowing for precise correction of yawing by rotating the eccentric shafts around rotating shafts, enabling stable correction of yawing errors in both the workpiece feeding direction and perpendicular direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera-based error detection and position correction is used, then yawing can be detected and corrected, but processing speed decreases and high-speed machining cannot be maintained
Solution Approach 1:
The patent pre-calculates and stores correction amounts for various yawing angles and positions in a lookup table before machining begins. During high-speed machining, the system simply retrieves pre-computed correction values based on current position and detected yawing angle, avoiding time-consuming real-time calculations and enabling maintenance of high processing speeds while still correcting for yawing errors
Solution Approach 2:
The patent replaces the conventional mechanical approach of physically adjusting the workpiece or tool position to correct yawing with a computational approach. Instead of mechanical repositioning, the system calculates correction amounts and adjusts the laser beam positioning through coordinate transformation, enabling faster correction without mechanical inertia limitations
2Manufacturing precision
If real-time position correction is performed during conveyance, then patterning accuracy can be maintained, but the complexity of the control system increases
Solution Approach 1:
The patent divides the correction process into separate independent modules: yawing detection module, correction amount calculation module (with lookup table), and laser positioning control module. Each module handles a specific aspect of the correction process, making the overall system more manageable and easier to implement while achieving accurate real-time correction
Solution Approach 2:
The patent creates a mathematical model (lookup table) that copies and stores the relationship between yawing angles, positions, and required correction amounts. This pre-computed model allows the control system to quickly retrieve correction values without performing complex real-time calculations, simplifying the control logic while maintaining high patterning accuracy
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
Enables precise correction of yawing errors during high-speed processing, ensuring accurate patterning and improved quality of workpieces by stabilizing the position of the conveyed workpiece, even at high speeds.
Implementation Method 1
eccentric shafts included in the other one of the holding device and the running device, the eccentric shafts including respective axes parallel to the corresponding rotating shafts. The axes of the eccentric shafts are disposed at respective positions such that, at one of the positions, one of the front portion and the rear portion is eccentric relative to an axis of the corresponding rotating shaft in the workpiece feeding direction by a predetermined eccentricity amount
Data Source
AI summary
A holding device to hold a side portion of a conveyed workpiece; a running device to convey the holding device in a feeding direction along a rail; and a support mechanism to support the holding device at front portion and rear portions of the mechanism. Eccentric shafts are with the holding device at respective positions, at one position, one of front and rear portions is eccentric in the feeding direction by a predetermined amount relative to one drive shaft's axis included in the running device. At the other position, one of front and rear portions is eccentric crossing the workpiece feeding direction by a predetermined amount relative to one drive shaft's axis in the running device. The yawing occurring while the workpiece is conveyed, is corrected by rotating the axes of eccentric shafts axes such the holding device moves relative to the running device's position.