Laser Fabric Cutting System with Offset Mandrel Chucks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional manual cutting techniques for tubular fabrics used in medical applications result in uneven edges, loose fibers, and increased costs due to labor-intensive corrections, and struggle with precision and consistency, especially when cutting complex shapes or adjacent limbs.
Innovation Solution
A fabric cutting system comprising a mandrel with a centered and offset chuck configuration, allowing for precise rotation and cutting of tubular fabrics using a cutting laser that provides a direct and unimpeded line of contact, enabling reliable and evenly sealed cuts, and accommodating different diameters with adjustable focal distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual heat-cutting with a soldering iron-type tool is used, then the fabric can be cut, but the edge becomes uneven and loose fibers extend from the cut line
Solution Approach 1:
The patent replaces manual mechanical heat-cutting with an automated laser cutting system. The laser cutting tool eliminates the need for manual operation while providing precise, consistent cuts without the uneven edges and loose fibers produced by soldering iron-type tools. The automated system maintains constant cutting parameters and positioning accuracy.
Solution Approach 2:
The patent changes the cutting method from contact-based heat cutting to non-contact laser cutting. This parameter change allows for precise control of cutting temperature, speed, and focal distance, resulting in clean edges without the degradation caused by manual heat-cutting tools.
2Manufacturing precision
If manual trimming with scissors is performed to correct uneven edges, then some loose fibers are removed, but the process is labor-intensive and increases manufacturing cost
Solution Approach 1:
The laser cutting system performs the cutting action with such precision that no subsequent trimming or correction is needed. The preliminary laser cut creates a clean, sealed edge that eliminates the need for manual trimming with scissors, thereby improving productivity by removing the labor-intensive correction step entirely.
3Ease of operation
If the fabric is manually rotated during cutting, then access to different areas is possible, but positioning accuracy decreases and cut quality becomes inconsistent
Solution Approach 1:
Instead of manually rotating the fabric to access different areas, the system inverts the approach by using a mandrel with offset chucks that automatically position and rotate the fabric at precise intervals. The offset chucks allow the laser to access all areas of the fabric including adjacent limbs without requiring manual intervention, thereby maintaining both ease of operation and high positioning accuracy.
4Adaptability or versatility
If a mandrel is rotated to cut adjacent limbs, then both limbs can be cut, but the mandrel legs must be loosened and re-tightened causing fabric movement and uneven cuts
Solution Approach 1:
The system uses dynamically adjustable offset chucks that can be positioned at different radial distances from the mandrel center. This dynamic configuration allows the laser to access adjacent limbs at optimal positions without requiring the mandrel to be stopped, loosened, and re-tightened. The fabric remains securely clamped throughout the entire cutting process, ensuring consistent cut quality across all limbs.
Solution Approach 2:
The offset chuck mechanism provides universal positioning capability that works for cutting any number of adjacent limbs on the mandrel. By adjusting the radial position of the chucks, the system can accommodate different limb configurations and diameters, making the same mechanism versatile for cutting single limbs, bifurcated grafts, or more complex multi-limb structures without compromising precision.
5Reliability
If light heat sealing is applied to the cut edge, then the edge is sealed, but routine handling disrupts the seal and fibers become loose
Solution Approach 1:
The laser cutting process inherently creates a sealed edge through controlled thermal fusion of the fabric fibers. By optimizing laser parameters such as power, speed, and focal distance, the system creates a strong, durable seal that is resistant to routine handling. This eliminates the need for separate light heat sealing steps that produce weak seals.
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 achieves precise, evenly cut, and completely sealed edges, reducing waste and operational costs, while ensuring quality control requirements are met for medical applications, with the ability to cut complex shapes and adjacent limbs efficiently.
Implementation Method 1
a fabric cutting tool configured to cut the fabric about the mandrel. In an embodiment, the fabric cutting tool is a cutting laser
Implementation Method 2
the fabric can be cut by the cutting laser having a line of contact with the first leg cut location unimpeded by the second leg
Data Source
AI summary
A fabric cutting system and/or method can include a mandrel having a body and first and second legs, a chuck, the chuck configured to receive either one of the legs or body to rotatingly support the mandrel. The mandrel can be rotated and the fabric mounted on the mandrel can be cut about the leg at a location beyond the end of the other leg. One of the legs can include a leg extension removable from a leg base that when removed allows the other leg to be cut beyond the end of the leg base. The fabric can be cut with a cutting laser, which may be a multi-axis laser, and/or have low power.