Segmented Yarn Severing Sinker Pivoting Motion
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Solution Overview
Problem
Existing thread cutting sinkers in flat knitting machines are prone to collisions with the thread guide due to their design, which can lead to unreliable thread grasping and separation issues, especially when the sinkers are arranged closely together.
Innovation Solution
The thread cutting sinker is designed in multiple parts, allowing the thread catching element to move independently of the drive element, enabling a pivoting motion that avoids collisions by being swiveled out of the thread guide's range, with a coupling mechanism providing a time delay in retraction to ensure safe distance from the thread guide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catch hook of the thread cutting sinker is designed to be high for reliable thread grasping, then thread grasping reliability is improved, but collisions with the thread guide occur
Solution Approach 1:
The thread cutting sinker is divided into two separate elements: a drive element and a thread catching element. This segmentation allows the thread catching element to be positioned high for reliable thread grasping while the drive element remains lower to avoid collisions with the thread guide.
Solution Approach 2:
The thread catching element is given freedom to move not only in the linear direction but also in a pivoting motion into a second dimension. This allows it to swivel out of the thread guide's range during operation, avoiding collisions while maintaining high position for thread grasping.
2Productivity
If thread cutting sinkers are arranged relatively close together to increase productivity, then productivity is improved, but collisions with parked thread guide occur during propulsion movement
Solution Approach 1:
The thread catching element is designed with dynamic movement capability, allowing it to pivot and change its position relative to the drive element. This dynamic adjustment enables the element to swivel out of the way of parked thread guides during propulsion, preventing collisions while maintaining close spacing for high productivity.
3Device complexity
If the thread catching element is coupled rigidly to the drive element for simple construction, then device complexity is reduced, but the thread catching element cannot move out of thread guide range
Solution Approach 1:
The sinker is segmented into drive element and thread catching element that are coupled but not rigidly fixed. The coupling allows relative movement between the two elements, providing mobility to the thread catching element while maintaining a relatively simple construction without complex mechanisms.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A flatbed textile knitting machine has a thread cutting plate (1) forming part of a thread cutting station. The cutting plate has a thread trap (3) and a drive element (2) that move with respect to each other over a limited range.