Thread-guiding device for textile cross-wound bobbin winding
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Solution Overview
Problem
Automatic cross-winding machines often experience issues with 'falling threads' during the winding process, leading to production stoppages and unnecessary manual interventions.
Innovation Solution
A thread-guiding device is installed at the end face of the thread-guiding channel in the workstation, featuring a thread-guiding contour with concavely curved regions and adjoining convexly curved slots, which guides the thread end centrally onto the bobbin, preventing it from falling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If thread-guiding drums are used to traverse the winding-on thread and rotate cross-wound bobbins, then high traversing speeds can be realized, but only random winding type bobbins can be produced with fixed laying angle
Solution Approach 1:
The patent separates the bobbin rotation function from the thread traversing function by introducing a separate bobbin drive roller and independent control system. This segmentation allows the thread-guiding drum to maintain high traversing speeds while the bobbin rotation is independently controlled to achieve precision winding patterns, thereby resolving the contradiction between speed and adaptability.
Solution Approach 2:
The patent implements dynamic control of the bobbin rotation speed and direction through independent drive mechanisms. The bobbin can be rotated in controlled manner while the thread-guiding drum maintains high traversing speed, enabling the system to adapt to different winding patterns (precision winding, stepped precision winding) while preserving high speed performance.
2Adaptability or versatility
If finger thread guides are used to traverse the winding-on thread, then flexibility and adaptability are improved, but falling threads occur during cleaner cuts
Solution Approach 1:
The patent introduces a thread-guiding device with a specific geometric contour (comprising a first region and a second region) that acts as an intermediary between the thread and the bobbin. This intermediary structure guides the thread end centrally onto the bobbin surface, preventing the thread from falling off while maintaining the flexibility needed for high-speed operation and different winding patterns.
Solution Approach 2:
The thread-guiding device is positioned and configured in advance to intercept and control the thread end before it can fall off the bobbin. The geometric contour of the guiding device is designed to preemptively direct the thread onto the correct path, preventing falling threads before they occur during cleaner cuts.
3Productivity
If high traversing speeds are used in automatic cross-winding machines, then productivity is improved, but falling threads cause production stoppages
Solution Approach 1:
The thread-guiding device is designed to automatically control and guide the thread end onto the bobbin without requiring external intervention or causing stoppages. The device self-regulates the thread path during high-speed operation, ensuring continuous production by preventing falling threads that would otherwise require machine stoppage for correction.
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
The thread-guiding device effectively prevents the occurrence of falling threads, reducing the need for manual interventions and minimizing production losses by ensuring consistent thread winding onto the cross-wound bobbin.
Implementation Method 1
the thread end of the upper thread connected to the cross-wound bobbin will not wind onto the cross-wound bobbin properly, but will be accelerated strongly in the direction of the cross-wound bobbin due to the thread tension prevailing in the running thread
Implementation Method 2
the cross-wound bobbin, which is rotatably mounted in a bobbin frame, preferably rests in a frictionally engaged manner on a drive roller that can be acted upon by an individual drive
Data Source
AI summary
Thread-guiding device for a workstation of a textile machine which produces cross-wound bobbins. The workstation has an unwinding aid device for feed bobbins, a winding device for producing a cross-wound bobbin and a thread-guiding channel which surrounds the thread path and which can be subjected to negative pressure. The thread-guiding device is installed at the end face of the thread-guiding channel in the region of a suction head above the regular thread path in the workstation and is designed such that during a thread cutting process initiated during the winding operation, the thread end of the newly created upper thread, said thread end shooting upwards as a result of the thread tension in the running thread, enters the thread-guiding device and is guided in a controlled manner by the thread-guiding device in the direction of the center of the cross-wound bobbin.