3D Trim Stitching Head for Small Radii and Sharp Corners
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Solution Overview
Problem
Current methods for applying decorative stitches on three-dimensionally configured automotive trim components are labor-intensive and limited in placement flexibility, particularly on complex surfaces like small radii and sharp corners, due to the need for access from both sides and the inability of existing machines to conform to these shapes.
Innovation Solution
A stitching apparatus with a needle bar assembly and a looper that rotates in a plane parallel to the component, driven by a post assembly connected to a motor, allowing for precise placement of stitches on complex surfaces without the need for extensive access, using a narrow post housing that can accommodate small radii and corners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional stitching method requiring access from both sides is used, then functional stitching can be achieved, but placement flexibility on complex surfaces is limited
Solution Approach 1:
The patent inverts the traditional stitching approach by stitching from the backside of the component rather than from the front. The needle penetrates from the backside through the skin/foam/substrate assembly, allowing the stitching mechanism to access areas that would be difficult or impossible to reach from the front side, thereby enabling placement on complex surfaces like brows and sharp corners
Solution Approach 2:
The patent changes the dimensional approach by positioning the stitching mechanism to access the backside of the component, effectively utilizing the third dimension (depth) to overcome surface complexity issues. This allows the stitching head to approach the stitching location from a different spatial dimension rather than being constrained to surface-level access
2Manufacturing precision
If existing stitching machines with predefined clearances are used, then standard stitching can be performed, but stitching around small in-plane radii is difficult
Solution Approach 1:
The patent employs a robotic stitching head with dynamic positioning capabilities that can adapt to varying surface geometries. The robotic system allows real-time adjustment of the stitching head's position, orientation, and angle to accommodate small in-plane radii and complex surfaces, replacing the static, predefined clearance limitations of traditional machines
Solution Approach 2:
The patent changes key operational parameters including the stitching head's approach angle, penetration depth, and positioning coordinates to adapt to different surface geometries. By dynamically adjusting these parameters, the system can maintain precise stitch placement on complex surfaces with small radii that would be inaccessible to machines with fixed clearances
3Reliability
If cut-n-sew methods are used to achieve functional stitching, then durability is improved, but labor intensity and cost increase
Solution Approach 1:
The patent enables the stitching system to perform both functional and decorative stitching in a single automated operation without requiring manual intervention for material preparation or multiple stitching passes. The robotic system automatically positions, penetrates, and stitches the material, eliminating the labor-intensive manual cutting and sewing steps while maintaining stitch durability
Solution Approach 2:
The patent merges the functional stitching and decorative stitching operations into a single integrated process. The same robotic stitching head that provides durable functional stitching also creates the decorative stitch pattern, eliminating the need for separate operations and significantly improving production efficiency while maintaining the durability benefits of true stitching
Data Source
AI summary
An apparatus and method for applying stitches to a decorative component having a three dimensional configuration is provided. A head for applying stitches to a decorative component having a three dimensional configuration, including: a needle bar assembly operatively coupled to the head; a looper configured to cooperate with the needle bar assembly in order to prove a plurality of stitches in the decorative component, the looper rotating in a plane parallel to the decorative component; a post assembly configured to drive the looper in a reciprocating fashion in the plane, wherein the post assembly is operatively coupled to a motor configured to drive the needle bar assembly in a reciprocating fashion, the post assembly being operatively coupled to the head via a cylinder arm assembly and a downshaft assembly; and wherein the cylinder arm assembly is rotated in a synchronized manner with a rock frame through mechanical linkage connecting a rock frame drive shaft to the cylinder arm assembly.