Spinning Station Yarn End Access During Stop Sequence
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Solution Overview
Problem
In spinning machines, after an interruption in yarn production, the process of piecing requires unwinding the yarn end from the bobbin, which is cumbersome due to the yarn being completely wound onto the bobbin surface, making it difficult to initiate the piecing process efficiently.
Innovation Solution
The spinning station is designed to initiate a stop sequence that stops the spinning unit and winding device in a manner that the last yarn section does not completely wind onto the tube, allowing for easier identification and unwinding of the yarn end, and temporarily adjusts winding parameters such as tension, traversing speed, and width to facilitate easier unwinding during the piecing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the yarn is completely wound onto the bobbin surface during normal operation, then the winding process is efficient and compact, but the yarn end becomes difficult to access and unwind during piecing operations
Solution Approach 1:
The control unit is programmed to automatically initiate a stop sequence that prevents complete winding of the yarn end onto the bobbin. This preliminary action ensures that when piecing operations are required, the yarn end remains partially unwound and accessible, eliminating the need for manual unwinding operations.
Solution Approach 2:
The control unit modifies winding parameters (such as winding tension, speed, or width) during the stop sequence to control the winding process. By changing these parameters, the system ensures the yarn end is wound to a controlled extent that facilitates easy access during piecing operations while maintaining efficient winding during normal production.
2Ease of operation
If the spinning unit and winding device are stopped completely during piecing operations, then the yarn end can be accessed, but the time required for piecing increases due to manual unwinding requirements
Solution Approach 1:
The system performs preliminary winding control during the stop sequence to leave the yarn end in an optimally positioned state. This preliminary action eliminates the need for time-consuming manual unwinding operations during piecing, as the yarn end is already accessible without requiring additional unwinding time.
3Productivity
If standard winding parameters are used during normal operation, then production efficiency is maximized, but the yarn end becomes tightly wound and difficult to unwind during piecing
Solution Approach 1:
The control unit changes winding parameters (tension, speed, width) during the stop sequence to create a controlled winding pattern. These parameter changes ensure the yarn end is wound in a manner that maintains production efficiency during normal operation while enabling easy unwinding during piecing operations.
Solution Approach 2:
The system dynamically adjusts winding parameters based on the operational state. During normal production, standard parameters maximize efficiency. During stop sequences, parameters are dynamically changed to optimize yarn end positioning for easy access during piecing operations.
Data Source
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AI summary
The present invention relates to a method for operating a spinning station of a spinning machine, wherein a fiber material (2) is supplied to a spinning unit (1) of the spinning station, wherein a yarn (4) is produced from the fiber material (2) supplied to the spinning unit (1) with the aid of the spinning unit (1), wherein the yarn (4) leaves the spinning unit (1) via an outlet (9) and is monitored with regard to at least one yarn parameter by means of a yarn monitoring unit (3), wherein the yarn (4) is wound onto a spool (6) with the aid of a winding device (5) and taking into account predetermined winding parameters, and wherein, upon detection of a defined deviation of a monitored yarn parameter from at least one setpoint, a stop sequence interrupting normal operation of the spinning station is initiated during a spool change on the winding device (5) and/or during a shutdown of the spinning station.During the stopping sequence, the spinning unit (1) and the winding device (5) are stopped, wherein the spinning unit (1) and the winding device (5) are stopped in such a way that the last produced yarn section does not completely wind onto the spool (6) located in the winding device (5). According to the invention, it is proposed that one or more winding parameters be changed at least temporarily after the initiation of the stopping sequence in order to facilitate the unwinding of the yarn section that was last wound onto the spool (6) before the winding device (5) was stopped during a subsequent spinning operation.