Yarn Knotter Rotating Clamp Eliminates Residue Waste
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing yarn knotting technologies result in yarn waste between the formation of two knots, which falls on the container as waste.
Innovation Solution
A yarn knotter with a drive disc and a knot hook, where the yarn holder has a rotating second clamp driven by the drive disc, allowing for the formation of two consecutive knots without yarn waste by ensuring the yarn is pulled out after the second knot is formed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional yarn knotter forms two knots with one drive pulley rotation, then productivity is improved, but yarn residue is created as waste
Solution Approach 1:
The second clamping element is made rotatable about a twine holder axis that forms an angle of less than 45° with the knotter axis. This dynamic rotational movement allows the clamping element to complete two full rotations for one drive pulley rotation, enabling the yarn to be properly pulled out after the second knot without creating residue waste
Solution Approach 2:
The solution introduces a new rotational dimension by allowing the second clamping element to rotate about the twine holder axis (at an angle less than 45° with the knotter axis) in addition to the primary knotting rotation. This additional dimensional movement enables the yarn to be pulled out cleanly after knot formation, eliminating the yarn residue problem while maintaining high productivity
2Loss of substance
If the second clamping element completes two revolutions per drive pulley revolution, then yarn waste is eliminated, but device complexity increases
Solution Approach 1:
The second clamping element serves multiple functions: it clamps the yarn during knot formation, rotates to enable the yarn to be pulled out after the second knot, and integrates with the existing drive pulley mechanism. This multi-functionality reduces the need for separate mechanisms to eliminate yarn waste, thereby limiting the increase in device complexity
Solution Approach 2:
The rotational movement of the second clamping element about the twine holder axis is merged with the existing drive pulley rotation mechanism. By combining these movements into a single integrated system where the clamping element completes two revolutions per drive pulley revolution, the solution eliminates yarn waste without requiring entirely separate mechanisms, thus controlling device complexity
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Yarn knotter (10) for forming two knots (16, 33) in a pair of yarn strands comprising: a drive disc (20) driven intermittently about a drive axis (A), a knotter hook (9) driven by the drive disc (20) about a knotter axis (K) for forming two successive knots (16, 33) in the pair of yarn strands (5, 7) by two complete rotations of the knotter hook (9) per rotation of the drive disc (20), a yarn holder (18) for clamping the pair of yarn strands (5, 7) between a first clamping element (21) and a rotatable second clamping element (22) of the yarn holder (18) driven by the drive disc (20), and a yarn knife (13) for cutting the pair of yarn strands (5, 7), characterized in that the rotatable second clamping element (22) of the yarn holder (18) is driven by the drive disc (20) about a yarn holder axis (G) is driven to rotate in such a waythat the rotatable second clamping element (22) completes two revolutions for every revolution of the drive disc (20), and that the yarn holder axis (G) and the knotter axis (K) enclose an angle of less than 45° with each other when viewed in the direction of the drive axis (A).