3D Component Stitching Head for Edge and Corner Access
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Solution Overview
Problem
Current methods for applying decorative stitches to three-dimensionally configured automotive trim components are limited by the need for access to both sides of the part, making it difficult to stitch over edges or around sharp corners.
Innovation Solution
An 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 the application of stitches in confined areas without the need for full access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a needle penetrates the part from the top side and engages a hook or looper on the backside, then functional stitching can be achieved, but access to both front and backside is required which limits stitch placement on complex surfaces
Solution Approach 1:
The patent inverts the traditional stitching approach by having the needle penetrate from the backside of the part and form stitches on the front side. This reversal eliminates the need for access to both sides of the component, allowing stitching on complex three-dimensional surfaces including brows, sharp corners, and highly contoured areas where only one side is accessible.
Solution Approach 2:
The patent introduces a specialized needle assembly with a curved needle and thread guide that acts as an intermediary mechanism. This allows the needle to penetrate at an angle and form stitches on the opposite side of the part, bridging the gap between the single accessible side and the desired stitch location without requiring direct access to both surfaces.
2Ease of operation
If stitching is applied perpendicular to and over the edge of a semi-rigid part, then edge stitching is achieved, but the stitch plate depth requirements preclude the plate from conforming to small radii
Solution Approach 1:
The patent employs a flexible needle assembly with a curved needle path and adjustable thread guide that can dynamically adapt to small radii and contoured surfaces. The needle bar and thread guide are positioned to allow the needle to follow the contour of the part edge while maintaining proper stitch formation, eliminating the rigidity constraints of traditional fixed-depth stitch plates.
3Device complexity
If predefined clearances for stitch plate movement are required, then machine structure is simplified, but stitching around small in-plane radii becomes difficult
Solution Approach 1:
The patent transitions from a traditional planar stitching approach to a three-dimensional needle path where the needle penetrates at an angle and forms stitches on the opposite side of the part. This dimensional change allows the needle to reach around small in-plane radii and access confined areas without requiring large stitch plate clearances, while the machine structure remains relatively simple.
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 provide 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.