Yarn Winding Device Reverse Rotation Control
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Solution Overview
Problem
Existing yarn winding devices lack precise control over the number of reverse rotations of the storage winding section when pulling out yarn from the storage device, leading to excessive yarn discard and prolonged joining operations.
Innovation Solution
A yarn winding device with a control section that calculates and instructs the exact number of reverse rotations based on the length of yarn stored per rotation and the distance to the yarn joining device, using a storage roller with a constant diameter for accurate calculations, and includes a yarn defect detection and cutting mechanism to remove defects, ensuring the yarn is pulled out by the required length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the storage arm or storage roller is reversely rotated for a predetermined time to pull out yarn, then the yarn can be guided to the yarn joining device, but the yarn length to be discarded becomes long and the joining operation time increases
Solution Approach 1:
The invention changes the control parameter from time-based reverse rotation to rotation-count-based control. The control section counts the number of reverse rotations of the storage roller and stops the reverse rotation after a predetermined number of rotations, thereby precisely controlling the yarn pull-out length and reducing both yarn waste and operation time.
2Ease of operation
If the storage arm or storage roller is reversely rotated for a predetermined time to pull out yarn, then the yarn can be guided to the yarn joining device, but the yarn pull-out length cannot be precisely controlled
Solution Approach 1:
The invention introduces a feedback mechanism through a rotation counting function in the control section. The control section monitors and counts the number of reverse rotations of the storage roller in real-time and uses this feedback information to precisely control the yarn pull-out length, stopping the reverse rotation after a predetermined number of rotations.
3Reliability
If the storage roller surface is sucked for a long time to catch yarn, then the yarn can be secured, but the yarns wound around the storage roller may get entangled
Solution Approach 1:
The invention performs the yarn pulling out action before the yarn joining operation. By pulling out the yarn from the storage roller and guiding it to the yarn joining device before the joining process begins, the invention eliminates the need for prolonged suction during the joining operation, thereby preventing yarn entanglement while ensuring reliable yarn catching.
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 solution allows for precise control of yarn length, reducing waste and operation time, while accurately detecting and removing defects, thus improving the efficiency of the yarn joining process.
Implementation Method 1
The yarn guiding member guides the yarn to the yarn joining device by swinging while catching the yarn. Alternatively, the yarn guiding member guides the yarn to the yarn joining device by blowing the caught yarn.
Data Source
AI summary
An automatic winder (yarn winding- device) includes a yarn storage device (19), a yarn joining device (14), an upper yarn pull-out section (18), and a control section. The yarn storage device (19) winds and temporarily stores a yarn (20) when a storage roller (61) is rotated. When guiding the yarn (20) from the yarn storage device (19) to the yarn joining device (14), the control section calculates an instructed number of reverse rotations, which is the number of times to rotate the storage roller (61) in a direction opposite to a direction of winding, and controls the storage roller (61) such that the number of reverse rotations of the storage roller (61) becomes the instructed number of reverse rotations.