Spinning Frame Yarn End Finding Thickening Control
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Solution Overview
Problem
The existing yarn end finding process in spinning frames has a low success rate, particularly for partial yarn supply bobbins with a lack of material, causing the yarn end to slip out and making it difficult for the yarn end finding device to catch.
Innovation Solution
A spinning frame that includes a state acquisition unit to detect when a roved yarn bobbin is running out or approaching completion, and a control unit to draft the yarn to make it thicker, forming a thicker yarn portion at the winding end of the yarn supply bobbin, which improves the success rate of the yarn end finding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yarn supply bobbin is wound with normal thickness yarn throughout, then the production process is simple and continuous, but the yarn end finding process has low success rate especially for partial yarn supply bobbins
Solution Approach 1:
The control unit creates a thick yarn portion at the winding end of the yarn supply bobbin in advance, before the yarn end finding process occurs. This preliminary thickening action ensures that when the yarn end needs to be found, there is already a detectable thick portion available, thereby improving the success rate of yarn end finding without requiring complex real-time detection and adjustment mechanisms.
Solution Approach 2:
Instead of changing the thickness of the entire yarn, the invention applies local quality change by creating a thick yarn portion only at the winding end of the yarn supply bobbin. The control unit selectively increases yarn thickness in this specific location while maintaining normal thickness elsewhere, making the yarn end detectable without affecting the overall yarn production process or requiring system-wide complexity.
2Reliability
If the yarn thickness is increased at the winding end to improve yarn end finding, then the yarn end finding success rate improves, but the yarn uniformity deteriorates
Solution Approach 1:
The control unit implements local quality by creating a thick yarn portion only at the winding end of the yarn supply bobbin, while the majority of the yarn maintains its normal uniform thickness. This localized thickening ensures yarn end detectability without compromising the overall uniformity and consistency of the yarn product used in production.
Solution Approach 2:
The invention applies partial action by creating a thick yarn portion only at the specific location where it is needed (the winding end), rather than thickening the entire yarn. This partial thickening is sufficient to improve yarn end finding success rate while minimizing the impact on yarn uniformity, as only a small portion of the yarn is affected.
3Reliability
If the roved yarn is drafted to become thicker near the end, then a thick yarn portion is formed for better yarn end detection, but the drafting process complexity increases
Solution Approach 1:
The control unit, which already exists for managing the spinning frame's operation, is extended to perform the additional function of controlling drive units to create thick yarn portions. By making the control unit multi-functional, the invention avoids adding separate complex drafting control systems while still achieving the desired yarn thickening effect at the winding end.
Solution Approach 2:
The invention merges the yarn thickness control function with the existing control unit of the spinning frame. Instead of creating a separate complex drafting control system, the control unit is enhanced to manage both normal spinning operations and the special thickening operation at the winding end, thereby reducing overall system complexity while achieving the desired effect.
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 thicker yarn portion at the winding end of the yarn supply bobbin enhances the success rate of the yarn end finding process, reducing unnecessary cutting during splicing and improving the quality of the splicing portion.
Implementation Method 1
a plurality of roller pairs configured to draft the roved yarn
Implementation Method 2
a plurality of drive units configured to drive at least one roller of the roller pair in each of the roller pairs
Data Source
Figure 1
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AI summary
The spinning frame (3) includes: a state acquisition unit (310) configured to acquire a lack of material in which a roved yarn bobbin (10) around which roved yarn (13) is wound has run out of the roved yarn; a plurality of roller pairs (331, 332, 333) configured to draft the roved yarn, the roller pairs respectively having bottom rollers (331a, 332a, 333a) and top rollers (331b, 332b, 333b); a plurality of drive units (331c, 332c, 333c) configured to drive the respective bottom rollers in the corresponding roller pairs; and a control unit (312) configured to control at least one of the drive units when the state acquisition unit acquires a lack of material such that the yarn after spinning becomes thicker before a lack of material is acquired, when the state acquisition unit acquires a lack of material.