Removable Yarn Delivery Drum With Tool-Free Fastening
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Solution Overview
Problem
Existing yarn feeding devices are not easily adaptable to different yarn qualities, as they lack mechanisms for tool-free and efficient exchange of yarn feed wheels, leading to potential misalignment and fluctuations in yarn delivery.
Innovation Solution
A yarn feeding device with a rotatably mounted shaft and a detachable yarn feed wheel, secured by a fastening element with a handle that allows tool-free tightening and loosening, featuring radial and axial adjustment mechanisms to ensure concentric alignment and prevent wobbling, enabling easy exchange and secure attachment to a textile machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yarn feed wheel is fixed to the shaft using a threaded stub with a machine screw, then the connection is secure and reliable, but the yarn feed wheel cannot be easily changed or exchanged
Solution Approach 1:
The fastening system is segmented into a fastening element with external thread and a corresponding threaded receptacle on the shaft. This allows the yarn feed wheel to be divided into a removable component that can be easily exchanged while maintaining a secure connection when assembled. The segmentation enables independent replacement of the yarn feed wheel without replacing the entire assembly.
Solution Approach 2:
The connection system transitions from a permanently fixed state to a dynamically adjustable state. The fastening element can be screwed in to secure the yarn feed wheel or unscrewed to allow exchange, enabling the system to adapt between secure operation and easy maintenance modes. This dynamic capability resolves the contradiction between reliability during operation and exchangeability during maintenance.
2Manufacturing precision
If the yarn feed wheel is permanently fixed to the shaft, then alignment and wobble prevention are maintained, but adaptation to different yarn qualities becomes difficult
Solution Approach 1:
The yarn feed wheel is segmented as a separate, exchangeable component rather than a permanently fixed part. This segmentation allows different yarn feed wheels optimized for different yarn qualities to be exchanged while maintaining precise alignment through the standardized fastening interface with the shaft.
Solution Approach 2:
The shaft with its threaded receptacle serves as a universal mounting interface that can accommodate different yarn feed wheels designed for different yarn qualities. This universal interface maintains alignment precision across multiple applications while enabling adaptability to various yarn types through component exchange.
3Device complexity
If a threaded fastening system is used without a handle, then the structure remains simple, but tool-free tightening and loosening becomes difficult
Solution Approach 1:
The handle is merged with the fastening element to create a unified component. This combination integrates the gripping function directly into the fastening tool, allowing operators to tighten and loosen the connection by hand without requiring separate tools. The merging adds minimal complexity while dramatically improving ease of operation.
Solution Approach 2:
The fastening element with integrated handle enables self-service operation, where the operator can directly manipulate the fastening mechanism without external tools. The handle provides the necessary leverage and grip for hand operation, making the system self-sufficient for routine tightening and loosening tasks.
Data Source
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AI summary
A yarn delivery device according to the invention has a rotatably mounted shaft with a yarn delivery wheel which is mounted removably. A fastening element in the form of a nut or a screw, which are provided in each case with a handle, serves to fasten the yarn delivery wheel. As a result, the yarn delivery wheel can be exchanged by hand without the aid of a tool. As an alternative or in addition, the attachment of a tool is advantageously possible. A bearing face, which points in the axial direction, of an abutment preferably serves to adjust the yarn delivery wheel in a wobble-free manner. The radial orientation, the axial orientation and the wobble-free axial orientation are brought about by different functional faces, namely the flat face (30) and the cylindrical outer circumferential face of the shaft (7).