Textile Machine Bobbin Reverse Drive for Thread Tension Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In textile machines, maintaining constant thread tension during automatic reattachment of threads after interruptions is challenging, leading to potential further tears and twists in the thread.
Innovation Solution
The method involves driving the bobbin in reverse rotation while forming the thread loop, matching the reverse rotation speed to the infeed movement of the feeder element, ensuring the exact thread length is returned from the bobbin, and using a controller to coordinate the drive operations, which helps maintain constant thread tension and prevent twists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bobbin is driven in reverse direction to unwind thread and form a thread loop, then the thread can be reattached after interruption, but the thread tension becomes difficult to maintain constant, causing further thread breaks and twists
Solution Approach 1:
The patent applies dynamics by making the bobbin rotation speed variable during the thread loop formation process. The bobbin drive speed is dynamically adjusted to match the feeder's infeed movement speed, ensuring constant thread tension. This resolves the contradiction by enabling automatic reattachment while maintaining thread tension stability through speed synchronization between the bobbin drive and feeder mechanism.
2Productivity
If the bobbin is driven in reverse direction to unwind sufficient thread length for loop formation, then the thread can be picked up by the feeder, but excessive thread unwinding occurs, consuming unnecessary time
Solution Approach 1:
The patent applies feedback by using the feeder's infeed movement as a reference signal to control the bobbin drive speed. The system continuously monitors the feeder's movement and adjusts the bobbin rotation speed accordingly, ensuring that the exact required thread length is unwound without excess. This feedback mechanism eliminates unnecessary thread unwinding and reduces time loss while maintaining productivity.
3Ease of manufacture
If the suction nozzle is moved away from the bobbin surface after drawing in the thread, then the thread is stretched for loop formation, but thread tension cannot be kept constant, leading to twists in the drawn-in thread
Solution Approach 1:
The patent uses the bobbin drive as an intermediary mechanism to maintain thread tension during loop formation. Instead of directly controlling thread tension through the suction nozzle movement alone, the system introduces the bobbin drive as a mediating element that actively compensates for tension changes. The synchronized bobbin rotation provides continuous thread supply at controlled speed, preventing twists and maintaining thread structure integrity during the loop formation process.
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
This approach allows for precise control of thread tension, reducing the risk of further breaks and twists, and optimizing the thread length required for piecing, while minimizing unnecessary thread unwinding and time expenditure.
Implementation Method 1
The suction nozzle is subjected to a vacuum for this purpose
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a method for automatically attaching a thread (4) at a work station (2) of a textile machine (1), one end (4a) of the thread (4) is located on the surface of a bobbin (7) by means of a suction nozzle (10), and the thread (4) is unwound from the bobbin (7) in the opposite direction to its regular take-up direction (AR). The thread (4) is drawn into the suction nozzle (10), while the bobbin (7) is driven in reverse (RR) by a reverse drive (8). By means of a feeder movement (9), a thread loop (4b) is formed from the thread (4) and fed to an attachment device (12). The bobbin (7) continues to be driven in reverse (RR) even while the thread loop (4b) is being formed, and the thread (4) continues to unwind from the bobbin (7). The reverse rotation speed of the bobbin (7) is synchronized with the feeder movement of the feeder (9).The textile machine (1) has a control (15) which is designed to operate the reverse rotation drive (8) of the bobbin (7) accordingly.