Yarn Return Unit Transverse Insertion Air Flow
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Solution Overview
Problem
Existing yarn return systems for open-end spinning machines are time-consuming and complex when dealing with thread breaks, requiring manual threading of the yarn into guiding nozzles.
Innovation Solution
A yarn return unit with a guiding section and a blowing unit that generates an air flow to direct the yarn back into the spinning unit, allowing for transverse insertion of the yarn without threading it through the guiding section or blowing unit, and includes a cutting section to form a defined yarn end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed annular ejector nozzle is used to return yarn, then the yarn can be returned into the spinning unit, but the yarn must be manually threaded into the nozzle which is time-consuming and complex
Solution Approach 1:
The yarn return device is divided into separate functional components: a receiving element with opening oriented perpendicular to the air flow direction, and a blowing element with the annular ejector nozzle. This segmentation allows the yarn to be inserted into the receiving element without threading through the nozzle, while the blowing element separately provides the air flow to propel the yarn back into the spinning unit.
Solution Approach 2:
The receiving element acts as an intermediary between the yarn insertion point and the ejector nozzle. It receives the yarn in a direction perpendicular to the air flow, holds it in position, and allows the air flow from the blowing element to act upon it. This intermediary structure eliminates the need for direct threading through the nozzle while maintaining effective yarn return.
2Ease of operation
If manual threading is required for yarn insertion, then the yarn can be guided into the system, but the process becomes time-consuming during piecing operations
Solution Approach 1:
Instead of requiring the yarn to be threaded in the direction of the air flow (traditional approach), the receiving element is oriented with its opening perpendicular to the air flow direction. This inverted approach allows for much easier yarn insertion since the yarn can be simply placed into the opening without complex threading maneuvers, dramatically reducing insertion time during piecing operations.
Solution Approach 2:
The system is designed so that the yarn can be automatically or semi-automatically inserted into the receiving element without requiring skilled manual threading operations. The perpendicular orientation of the receiving element opening enables simple insertion mechanisms, reducing the need for operator skill and time during yarn replacement operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates efficient and automated yarn return during piecing processes, reducing downtime and manual intervention by enabling transverse insertion and air-assisted yarn guidance, thus streamlining the yarn return process.
Implementation Method 1
a blowing unit (13) for generating an air flow (19) for returning the yarn (3) into the delivery unit (2)
Data Source
AI summary
A yarn return unit for returning a yarn into a delivery unit of a textile machine during a piecing process includes a yarn-guiding section configured to guide and position the yarn with respect to the delivery unit. A blowing unit generates an air flow for returning the yarn from the yarn-guiding section into the delivery unit, the blowing unit defining a flow direction of the air flow. The yarn-guiding section includes an open contour that defines an insertion area through which the yarn is inserted into the yarn-guiding section transversely to the flow direction of the air flow.