Multi-Zonal Flat-Knit Shoe Upper With Precise Yarn Positioning
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Solution Overview
Problem
Existing knitting technologies for footwear and apparel face challenges in controlling yarn positioning to achieve precise, functional zones with varying properties, leading to increased knitting times and costs, particularly when complex patterns and materials are involved.
Innovation Solution
A customized, flat-knit multi-zonal element for shoe uppers is developed, utilizing independently controlled feeders and knitting machines to merge and diverge yarns, allowing precise positioning of yarns at the stitch level, forming distinct knit structures and zones with predetermined properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If yarn positioning is controlled using conventional knitting technologies, then functional zones with varying properties can be achieved, but knitting times increase and production costs rise
Solution Approach 1:
The needle bed is divided into multiple independently controllable feeder zones, allowing different yarns to be fed and positioned independently at specific locations. This segmentation enables precise yarn positioning for functional zones without requiring slow, conventional knitting methods, as each zone can be optimized separately for both precision and speed.
Solution Approach 2:
The knitting machine employs dynamically adjustable feeders that can change their position and feeding characteristics during the knitting process. This dynamic control allows the system to adapt yarn positioning in real-time, achieving high precision for functional zones while maintaining high knitting speeds through automated adjustments rather than manual intervention.
2Adaptability or versatility
If complex patterns and materials are used to create functional zones, then article functionality is enhanced, but production costs increase
Solution Approach 1:
The knitting machine is designed with multi-functional feeders that can handle various yarn types and create different knit structures using the same basic hardware. This universality allows complex patterns and functional zones to be achieved without proportionally increasing device complexity, as a single feeder system can perform multiple functions through programmable control.
Solution Approach 2:
The system achieves functional zone variety by changing knitting parameters (such as stitch type, yarn tension, and feeder position) rather than requiring fundamentally different machine components. This parameter-based approach allows diverse functional zones to be created while keeping the physical device complexity manageable, as the same hardware can produce different results through parameter adjustment.
3Stability of the object's composition
If traditional knitting methods are used for multi-zonal elements, then seamless zone transitions can be achieved, but knitting times increase
Solution Approach 1:
The knitting machine maintains continuous operation without stopping or reversing to create zone transitions. Multiple feeders work simultaneously and continuously, feeding different yarns that blend or transition seamlessly at zone boundaries. This continuous action eliminates idle time while maintaining smooth transitions, as the system never interrupts the knitting process to reposition elements.
Solution Approach 2:
The feeders are pre-positioned and pre-configured with the appropriate yarns before knitting begins. Zone transition points are planned and set up in advance, allowing the knitting machine to execute seamless transitions as part of the continuous knitting process rather than requiring post-processing or interruptions. This preliminary preparation enables smooth zones without time loss.
Data Source
AI summary
A customized, flat-knit multi-zonal element for a shoe upper and a method of producing such an element that allows for continuous knitting while controlling positioning of individual threads. One or more carriages may move continuously along the needle bed while threads are provided to the needles for a complete stroke. Knit elements may include multiple zones with differing properties. Threads may alter positions within knit structures from zone to zone. A knit element may include a first zone in a first plane that includes at least two merged threads to form a merged knit structure and a second zone in a second plane connected to the first zone seamlessly. Some knit structures may be positioned throughout the knit element such that they control a position of zones relative to each other.