Loom Guide Units for Variable-Thickness Fabric Beat-Up Guidance
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Solution Overview
Problem
Existing weaving machines struggle to ensure a secure and reliable weaving process, especially for woven fabrics that deviate from typical geometry, such as those with greater thickness and/or uneven surface characteristics.
Innovation Solution
The implementation of a guide device with guide units that extend partially over the woven fabric width, allowing for precise guidance of the woven fabric in the area of the weaving reed beat-up plane. This guidance is achieved through contacting guide sections that can be positioned in the woven fabric thickness direction, utilizing a control unit to adjust the position of the guide units based on information related to the woven fabric structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional guiding methods are used, then the weaving machine structure remains simple, but the guidance precision for fabrics with varying thickness and surface characteristics deteriorates
Solution Approach 1:
The guide device is divided into multiple independent guide units (first guide unit, second guide unit, etc.) that can be independently positioned and adjusted. Each guide unit comprises guide sections that can be individually controlled to accommodate different fabric thicknesses and surface characteristics, thereby improving guidance precision without requiring a completely complex redesign of the entire guiding system.
Solution Approach 2:
The guide sections are made movable in the thickness direction of the woven fabric through drive mechanisms controlled by a control unit. This dynamic adjustability allows the guide sections to adapt their position based on real-time feedback about fabric characteristics, enabling precise guidance for fabrics with varying thickness while maintaining a relatively simple base structure that can be dynamically modified as needed.
2Adaptability or versatility
If fixed guide sections are used, then the device complexity is low, but the adaptability to different fabric thicknesses and surface characteristics deteriorates
Solution Approach 1:
The guide sections are equipped with drive mechanisms that enable them to move dynamically in the thickness direction of the woven fabric. The control unit receives information about fabric characteristics and adjusts the guide section positions accordingly, providing adaptability to different fabric thicknesses and surface characteristics while using a modular approach that keeps the overall complexity manageable.
Solution Approach 2:
The guide sections can change their position parameter (distance from the weft insertion device in the thickness direction) based on detected fabric characteristics. This parameter adjustment allows the system to adapt to varying fabric thicknesses and surface profiles, enabling the same guide device structure to handle diverse fabric types through controlled parameter changes rather than requiring multiple fixed configurations.
3Reliability
If no active control is applied, then the device complexity is minimal, but the reliability of the weaving process for non-typical fabrics deteriorates
Solution Approach 1:
The control unit receives information about the actual fabric characteristics (thickness, surface characteristics) and uses this feedback to adjust the guide section positions. This closed-loop control ensures reliable weaving operation for non-typical fabrics by continuously adapting the guide sections to match the actual fabric properties, preventing guidance errors that would compromise weaving reliability.
Solution Approach 2:
The system detects fabric characteristics before the weaving process begins and pre-adjusts the guide sections to the appropriate positions. This preliminary positioning based on detected fabric properties ensures that the guide sections are already optimally configured when the weaving starts, thereby ensuring reliable operation without requiring complex real-time control adjustments during the weaving process itself.
Data Source
AI summary
A weaving machine includes a shed forming device, a weft insertion device, and a weaving reed that beats up the weft threads at a beat up plane against an edge of the woven fabric. A guide device extends over a width of the woven fabric and is driven by a drive, the guide device being one or both of an upper guide unit that contacts a top surface of the woven fabric or a lower guide unit that contacts a bottom surface of the woven fabric. One or both of the upper and lower guide units are positionable in a direction of thickness of the woven fabric to contact and guide the woven fabric in an area of the beat up plane. The guide section of one or both of the upper and lower guide units has a profiled shape in a weft direction to guide the woven fabric at different thicknesses in the weft direction.