Elastic Yarn Guide Roller Disengagement Prevention
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Solution Overview
Problem
The existing circular knitting machines face issues with elastic yarn disengagement from the guide roller during cotton waste removal, leading to unstable yarn-feeding tension and potential yarn severance, especially when using short fiber yarns like cotton, which affects fabric quality and machine productivity.
Innovation Solution
A disengagement-preventive member, such as a spiral wire or U-shaped guide, is installed on the yarn carrier to maintain the elastic yarn's position on the guide roller, allowing for adjustable movement to prevent disengagement, ensuring consistent yarn feeding and minimizing warping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If air gun is used to blow away cotton waste from knitting head, then cotton waste removal is improved, but elastic yarn may come off guide roller causing yarn disengagement
Solution Approach 1:
A protective member is introduced as an intermediary element between the air gun and the elastic yarn. This member allows air to pass through for waste removal while physically blocking the air flow from directly contacting and displacing the elastic yarn on the guide roller, thus mediating the interaction between waste removal and yarn stability
Solution Approach 2:
The protective member is positioned in advance to prevent the harmful effect of air flow on the elastic yarn before it can occur. By placing this barrier upstream of the yarn, the system preemptively counteracts the potential disengagement caused by air pressure during waste removal
2Productivity
If elastic yarn is kept on guide roller for plating knitting, then fabric production is improved, but yarn may disengage during waste removal requiring manual repositioning
Solution Approach 1:
The protective member enables the system to perform waste removal automatically without requiring manual intervention for yarn repositioning. The member self-services by continuously protecting the yarn during the air blowing process, eliminating the need for operator intervention and time loss
3Object-generated harmful factors
If air flow is used to remove cotton waste, then waste clearance is improved, but yarn-feeding tension becomes unstable
Solution Approach 1:
The protective member acts as a mediator that separates the air flow path from the yarn path. It allows air to pass through for waste removal while maintaining a stable environment for the yarn, thus decoupling the waste removal function from the yarn tension stability function
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 effectively prevents elastic yarn disengagement during cotton waste removal, maintaining stable yarn tension and improving fabric quality and manufacturing productivity by ensuring the elastic yarn remains securely on the guide roller.
Implementation Method 1
an air stream is used to blow away the cotton waste
Implementation Method 2
the elastic yarn is knitted, it is guided by a guide roller so as to keep the feeding tension as low as possible
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~4
AI summary
A yarn-feeding means used in a circular knitting machine for plating knitting im which a ground yarn (18a) acid an elastic yam (16a) are knitted together. The yam feeding means comprise a first yarn-feeding device (15a) that feeds the ground yam (18a), a second yarn-feeding device (15b) that feeds the elastic yarn (16a) and a guide roller (8b) that guides the elastic yam (16a). The yarn feeding means is provided with a disengagement-preventing member (8c; 88c; 8f) that prevents the elastic yarn (16a) from coming off the guide roller (8b) which member is positioned close to the guide roller (8b). The disengagement-preventing member (8c) can be moved according to an angle of advance of the elastic yarn (16a). The disengagement-preventing member (8c) may be a spiral wire mounted on a yarn carrier (8).