Spinning Machine Yarn Transfer via Thread Lifter Extraction
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Solution Overview
Problem
Existing spinning machine technologies face challenges in efficiently transferring yarn ends to piecing devices without causing yarn damage or lap formation, particularly during controlled shutdowns for maintenance or defect removal.
Innovation Solution
A method involving a spinning station with a changeable yarn guide and a thread lifter that lifts the yarn out of the guide before rewinding, allowing for safe transfer to a piecing device, reducing the risk of damage and lap formation by maintaining the yarn in its regular path and avoiding deflection by rotating parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yarn is left in the yarn guide during controlled shutdown and rewinding, then the yarn path remains simple and continuous, but the yarn may be damaged by yarn-guiding components or break again during rewinding
Solution Approach 1:
The yarn is extracted from the yarn guide before the rewinding process begins. The yarn guide is moved to a parking position outside the winding area, separating the yarn path from potential damage sources during rewinding operations
Solution Approach 2:
The yarn guide is moved to the parking position before the rewinding process starts. This preliminary action prevents the yarn from being damaged by yarn-guiding components during the subsequent rewinding operation
2Ease of manufacture
If the yarn is deflected by rotating parts during rewinding, then the rewinding process can be simpler, but lap formation may occur on rotating parts
Solution Approach 1:
The yarn is extracted from the winding area by moving the yarn guide to a parking position outside the winding area. This removes the yarn from the path of rotating parts, preventing lap formation while keeping the rewinding process simple
3Ease of operation
If a movable piecing device with suction nozzle is used to find the yarn end on the bobbin surface, then the yarn can be transferred for piecing, but the process becomes time-consuming and may require multiple attempts
Solution Approach 1:
The yarn end is positioned in a defined location in front of the winding device before the shutdown is complete. This preliminary positioning eliminates the need for time-consuming searches by the piecing device, as the yarn end is already where it needs to be for transfer
Solution Approach 2:
The controlled shutdown process itself positions the yarn end in the correct location for piecing. The system performs the positioning function automatically as part of the shutdown sequence, eliminating the need for separate yarn search operations
Data Source
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AI summary
In a method for transferring yarn (5) produced in a spinning station (1) of a spinning machine to a rewinding device for the purpose of rewinding, wherein the spinning station (1) is associated with a winding device (8) with an interchangeable yarn guide (23) for winding the yarn (5) onto a bobbin (18), the yarn production is deliberately interrupted and the spinning station (1) is brought to a controlled standstill. After the standstill, one end (10) of the produced yarn (5) is located at a defined position in the yarn path in front of the winding device (8). Before rewinding, the yarn (5) is unwound from the bobbin (18) and rewound in the opposite direction to its regular take-up direction, whereby the yarn (5) is first lifted out of the yarn guide (23) by means of a handling device inherent to the spinning station, in particular a yarn lifter (17), and only then is the rewinding of the yarn (5) started.In a spinning machine with at least one spinning station (1) for producing yarn (5), with at least one winding device (8) assigned to the spinning station (1) for winding the yarn (5) onto a bobbin (18), wherein the winding device (8) has a changeable yarn guide (23), with a control unit by means of which the spinning station (1) can be stopped in a controlled manner, and with a re-spinning device for re-spinning the yarn (5), a handling device specific to the spinning station (1) is arranged by means of which the yarn (5) can be lifted out of the yarn guide (23) after the controlled stopping of the spinning station (1) and transferred to the re-spinning device.