Yarn Winder Free Length Control for Tapered Package Formation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional yarn winders face difficulties in performing taper winding due to fixed traverse widths, which can lead to yarn stitching and defective packages, especially when winding monofilaments, and also struggle with complex configurations for adjusting traverse widths.
Innovation Solution
A yarn winder that increases the free length of the traverse device from the beginning to the end of winding, using a position sensor and elevating/lowering control to adjust the traverse device, allowing for consistent taper winding and preventing yarn stitching, while maintaining accurate control of the free length and package shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed groove shape is used in the cylindrical grooved cam, then the device complexity is reduced, but the traverse width cannot be changed during winding, making taper winding difficult
Solution Approach 1:
The patent applies the dynamics principle by making the groove shape changeable during the winding process. The cylindrical grooved cam is designed with a mechanism that allows the groove inclination to vary dynamically, enabling the traverse width to be adjusted continuously or in steps during winding. This resolves the contradiction by transforming a static, fixed-geometry component into a dynamic one that can adapt its geometry to achieve both structural simplicity and functional versatility.
Solution Approach 2:
The patent applies the parameter changes principle by varying the groove inclination angle parameter of the cylindrical grooved cam during the winding process. By changing this geometric parameter, the traverse width is adjusted to enable taper winding. This allows the system to maintain a relatively simple cam structure while achieving variable traverse width through parameter modification rather than complex mechanical adjustments.
2Adaptability or versatility
If the traverse guide is moved by a driving motor, then the traverse width can be easily changed during winding, but the device complexity increases
Solution Approach 1:
The patent applies the mechanics substitution principle by replacing the motor-driven traverse guide mechanism with a mechanically passive cylindrical grooved cam system. Instead of using an active motor to move the traverse guide, the invention uses the rotational motion of the cam and its groove geometry to automatically control the traverse motion. This substitution eliminates the need for additional motors and control systems while maintaining the ability to adjust traverse width through groove shape design.
Solution Approach 2:
The patent applies the self-service principle by designing the cylindrical grooved cam to automatically control the traverse width without requiring external actuation. The groove geometry itself serves the function of guiding the traverse motion, and by varying the groove shape, the system self-adjusts the traverse width to enable taper winding. This eliminates the need for separate driving mechanisms and reduces overall device complexity.
3Device complexity
If constant traverse width is used, then the device structure is simplified, but yarn stitching occurs during winding of monofilament
Solution Approach 1:
The patent applies the dynamics principle by transforming the static traverse width into a dynamic parameter that changes during the winding process. The cylindrical grooved cam is designed with variable groove inclination that causes the traverse width to decrease progressively as winding proceeds. This dynamic adjustment prevents yarn stitching by ensuring proper yarn delivery angle and tension throughout the winding process, thereby improving package quality without significantly complicating the device structure.
Solution Approach 2:
The patent applies the parameter changes principle by varying the traverse width parameter during the winding process through the groove geometry design. By changing the effective traverse width parameter as winding progresses, the system prevents yarn stitching defects while maintaining a relatively simple cam-based mechanical structure. The parameter change is achieved through the inherent geometry of the variable groove rather than complex mechanical adjustments.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An object of the present invention is to provide a device and method for a yarn winder which enables a package to be manufactured by taper winding. The present invention provides a yarn winder 1 that forms a package 4, the yarn winder including a contact roller 8 that contacts with the package 4 during formation of the package 4. a traverse device 7 located on an upstream side of the contact roller 8 in an advancing direction of a yarn 2, and a free length changing means 9 for enabling a change in free length FL of the yarn 2 between the contact roller 8 and the traverse device 7 during the formation of the package 4, and wherein during the formation of the package 4, the free length FL is substantially increased to allow winding to be performed such that the resulting package 4 includes a tapered end surface.