Yarn Winding Machine Traverse Speed Control
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Solution Overview
Problem
Conventional yarn winding machines face challenges in effectively addressing the saddle bag shape and bulge winding phenomena, particularly when the reference winding angle is reduced due to high-order requirements or near the start and end positions of the package, leading to inadequate adjustment of the winding width and simultaneous failure to dissolve both issues.
Innovation Solution
The yarn winding machine and method involve synchronizing the traverse speed changing period with the free length changing period to temporarily increase the winding angle, allowing for effective adjustment of the winding width, and incorporating a bulge suppressing mechanism that gradually changes the traverse speed and winding angle during the package forming period to prevent excessive tightening and bulge winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the reference winding angle is reduced due to high-order requirements or near start and end positions of the package, then the winding quality is improved, but the winding width adjustment effectiveness is reduced and saddle bag shape phenomenon cannot be sufficiently dissolved
Solution Approach 1:
The patent applies periodic action by temporarily and repeatedly changing the traverse speed during the winding process. The control unit periodically adjusts the traverse speed to values higher than the reference speed during specific periods (when saddle bag shape is detected), creating periodic variations in winding angle that enable effective winding width adjustment even when the reference winding angle is small. This periodic intervention dissolves the saddle bag shape phenomenon without requiring a permanently increased reference winding angle.
Solution Approach 2:
The patent implements dynamics by making the traverse speed variable and adaptive rather than constant. The control unit dynamically adjusts the traverse speed based on real-time detection of package shape (saddle bag phenomenon) and current winding parameters. This dynamic adjustment allows the system to optimize winding width adjustment effectiveness at any point during the winding process, regardless of the reference winding angle value, thereby resolving the contradiction between winding quality and adjustment effectiveness.
2Manufacturing precision
If the traverse speed is increased to increase the winding angle for effective winding width adjustment, then the saddle bag shape phenomenon is dissolved, but the yarn layer may be excessively loosened causing bulge winding
Solution Approach 1:
The patent applies local quality by making different parts of the winding process have different traverse speed characteristics. The control unit selectively increases traverse speed only during specific periods when saddle bag shape is detected, rather than maintaining a uniformly high traverse speed throughout. This localized adjustment ensures winding width correction is applied precisely where needed (at saddle bag locations) without excessively loosening yarn layers in other regions, thereby preventing bulge winding while maintaining package shape uniformity.
Solution Approach 2:
The patent implements feedback through the control unit that continuously monitors package shape (detecting saddle bag phenomenon) and adjusts traverse speed accordingly. The system uses real-time feedback about package geometry to dynamically modify winding parameters, increasing traverse speed only when and where saddle bag shape is detected. This feedback mechanism ensures that traverse speed adjustments are precisely targeted to dissolve saddle bag shape without causing excessive loosening that would lead to bulge winding, thus maintaining overall package shape uniformity.
3Manufacturing precision
If a saddle bag shape collapsing mechanism is used to temporarily increase free length of yarn, then the winding width is adjusted, but the effect is insufficient when the reference winding angle is small
Solution Approach 1:
The patent applies parameter changes by modifying the traverse speed parameter (which directly affects winding angle) in addition to the free length parameter. When the reference winding angle is small, the control unit compensates by temporarily increasing traverse speed to achieve a higher instantaneous winding angle during the free length increase period. This dual parameter approach (free length + traverse speed) ensures effective winding width adjustment and reliable saddle bag shape dissolution even when the reference winding angle is small, overcoming the limitation of conventional mechanisms that only adjust free length.
Data Source
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AI summary
An object of the present invention is to provide a yarn winding machine and a yarn winding method which allow a saddle bag shape phenomenon to be very effectively dissolved even if a reference winding angle is reduced in response to high-order requirements such as a yearn type. A yarn winding mechanism (winder) 11 includes a roller 31 contacting with a package 18 during a package forming period P1 for synthetic fiber yarn Y, a traverse device 21 allowing a traverse speed to be changed and repeating temporarily increasing the traverse speed from a reference speed V1 to a target speed V2 and then reduce the traverse speed down to the reference speed V1, and free length changing means 41 for allowing free length FL of the synthetic fiber yarn Y between the roller 31 and the traverse device 21 to be changed and repeating free length change so as to temporarily increase and then reduce the free length FL. A traverse speed changing period T2 during which the traverse speed change is performed matches or overlaps a free length changing period F2 during which the free length change is performed.