Patterned Fabric Piece Layout With Variable Margins
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Solution Overview
Problem
Existing methods for cutting patterned fabrics face inefficiencies due to non-coincidence between the fabric model and actual spread fabric, leading to potential overlaps and increased material loss, especially when the pattern pitch is large.
Innovation Solution
A method for calculating a variable margin around each piece to be cut, considering the fabric's rate of variation and placement constraints, to prevent overlaps and minimize material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed margin corresponding to a percentage of the theoretical pitch is applied to each piece, then the risk of overlap is reduced, but material loss increases significantly
Solution Approach 1:
The patent applies a variable margin that adapts to each piece's position and the actual pattern pitch measurements, rather than using a fixed margin. The margin is dynamically adjusted based on the distance to adjacent pieces and the measured pattern pitch at that location, allowing minimal spacing where safe and larger spacing only where necessary to prevent overlap.
Solution Approach 2:
The patent changes the margin parameter from a fixed value (percentage of theoretical pitch) to a variable value based on actual measurements. The system measures the actual pattern pitch on the spread fabric and uses this information to calculate appropriate margins for each piece, optimizing the balance between preventing overlap and minimizing material loss.
2Reliability
If border regions encompassing each piece are increased to prevent overlap, then reliability improves, but placement efficiency decreases
Solution Approach 1:
The patent dynamically determines border regions based on actual pattern pitch measurements and piece positions rather than using fixed enlarged borders. The system calculates the necessary border for each piece based on the measured fabric variations and the positions of adjacent pieces, creating adaptive borders that are tight where possible and extended only where needed to prevent overlap.
Solution Approach 2:
The patent applies different border sizes to different pieces based on their local context. Each piece receives a customized border region determined by its specific position on the fabric, the measured pattern pitch in that area, and the positions of neighboring pieces. This local optimization allows efficient placement in most areas while providing enhanced protection only where fabric variation or piece proximity requires it.
3Measurement precision
If the theoretical placement is modified to match actual fabric pattern, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the system measures the actual pattern pitch on the spread fabric and uses this information to adjust the theoretical placement. Image capture devices detect the actual pattern positions, and this measurement feedback is used to recalculate piece positions and margins, ensuring high precision alignment with the actual fabric pattern while using systematic algorithms to manage the complexity.
Data Source
AI summary
A method for placing pieces intended to be cut automatically from a fabric having a pattern that repeats at a predetermined pitch, called pattern pitch, involves the steps of determining a list of pieces to be placed on the fabric, for at least one piece of the placement, calculating a contour to be placed around the piece, the contour having a variable margin in order to avoid an overlap between adjacent pieces, the margin being a function of a predefined rate of variation of the fabric and of at least one predetermined constraint of placement of the piece on the fabric, and developing a theoretical placement of the pieces on the fabric taking into account the contour to be placed of each piece.