Loop Material Sewing Method Using Segmented Fork Mechanism
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Solution Overview
Problem
Existing loop sewing machines struggle to create a loop material with a short length, leading to misalignment issues when a shoelace passes through, as the folded portion of the loop material often interferes with the shoelace.
Innovation Solution
A loop material sewing method and machine that utilizes a fork mechanism with long and short fork pins to fold and sew the loop material in a way that minimizes its length, allowing the folded portion to be securely sewn on the fabric, reducing friction and interference with the shoelace.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the loop material length is reduced to minimize tongue misalignment, then the loop size is minimized, but the folded portion interferes with the shoelace passing through
Solution Approach 1:
The fork member is segmented into multiple pins (first pin, second pin, third pin) with different lengths and functions. The first pin folds the loop material, the second pin guides the folded portion, and the third pin supports the folding process. This segmentation allows the folding process to be distributed across multiple points, reducing interference with the shoelace while maintaining effective loop formation.
Solution Approach 2:
The fork member acts as an intermediary tool between the sewing mechanism and the loop material. It temporarily holds and manipulates the loop material during the folding process, then releases it for sewing. The fork member's pins provide intermediate support points that guide the material through the folding process without creating excessive friction or interference with the shoelace.
2Device complexity
If a single fork pin is used to fold the loop material, then the device complexity is low, but the folding reliability is insufficient for short loop materials
Solution Approach 1:
The fork member is divided into multiple pins (first pin, second pin, third pin) with distinct functions. The first pin performs the primary folding action, the second pin guides the folded portion, and the third pin provides additional support. This segmentation distributes the folding task across multiple points, significantly improving reliability for short loop materials while maintaining reasonable device complexity.
Solution Approach 2:
Each pin in the fork member has different local properties - different lengths and positions - optimized for its specific function. The first pin is positioned and sized for folding, the second pin for guiding, and the third pin for support. This local differentiation allows each component to perform its function efficiently, improving overall folding reliability without requiring a completely complex structure.
Data Source
AI summary
The loop material sewing method includes: sewing one end of a loop material on a fabric in a state where a front side of the loop material faces the fabric; arranging a fork member including a pair of fork pins so as to arrange the loop material between the pair of fork pins; folding an opposite end of the loop material to a back side of the loop material by rotating the fork member around an axial line parallel to an extending direction of the pair of fork pins; relatively moving the fabric and the fork member in a length direction of the loop material; arranging the folded opposite end on the fabric, pulling out the fork pins from a folded portion at the opposite end by moving the fork member in a width direction of the loop material and sewing the folded opposite end on the fabric.