Thread Clamping Assembly With Polygonal Anti-Rotation Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing thread clamping devices for spinning or twisting machines face issues with torsion-resistant connections between the inner sleeve and the spindle, leading to material displacement and potential blockages due to manufacturing inaccuracies, which can cause friction and failure.
Innovation Solution
A thread clamping device with a thread separator that axially and rotationally secures the inner sleeve to the spindle using a press connection and engagement elements, eliminating the need for separate torsion-proof designs on the spindle, and utilizing a metal-containing thread separator produced via sintering for precise polygonal shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spindle upper part is partially knurled to ensure torsion-proof connection, then the connection reliability is improved, but the manufacturing complexity and precision requirements increase
Solution Approach 1:
The invention extracts the knurled section design from the spindle upper part and relocates it to the thread separator. This allows the spindle to have a simpler, more easily manufactured surface while the thread separator carries the torsion-resistant engagement features. The thread separator with its polygonal outer contour engages with the inner sleeve to provide the necessary anti-rotation connection without requiring complex knurling on the spindle.
Solution Approach 2:
The inner sleeve acts as an intermediary element between the spindle and the thread separator. It transfers the torsional connection requirements from the spindle to the thread separator, allowing the spindle to remain simple while achieving reliable torsion-proof connection through the sleeve's engagement with the polygonal thread separator.
2Manufacturing precision
If the knurled section edges are not sufficiently sharp, then the manufacturing tolerance is relaxed, but material displacement occurs causing inner sleeve deformation and potential blockage
Solution Approach 1:
The invention removes the problematic knurled section from the spindle design and relocates the torsion-engagement features to the thread separator. This eliminates the source of material displacement and inner sleeve deformation while maintaining reliable torsion-proof connection through the polygonal engagement geometry.
Solution Approach 2:
The invention changes the geometric parameters of the engagement interface from knurled surfaces to polygonal contours. The thread separator features a polygonal outer contour with specific edge geometries that engage with corresponding features on the inner sleeve, providing reliable torsion resistance without the material displacement issues associated with conventional knurling.
3Reliability
If a toothed annular surface is formed on the inner sleeve for engagement, then the torsion-proof connection is improved, but the manufacturing precision requirements for both inner sleeve and spindle increase
Solution Approach 1:
The invention extracts the toothing features from the inner sleeve and relocates them to the thread separator. The thread separator now carries the polygonal outer contour that engages with the inner sleeve, eliminating the need for precise toothing on the inner sleeve while maintaining reliable torsion-proof connection.
Solution Approach 2:
Instead of forming toothing on the inner sleeve to engage with the spindle, the invention inverts the approach by forming polygonal engagement features on the thread separator to engage with the inner sleeve. This reverses which component carries the complex geometry, simplifying the inner sleeve manufacturing while maintaining connection reliability.
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
Ensures a simple, reliable, and cost-effective torsion-resistant assembly of the inner sleeve to the spindle, preventing deformations and malfunctions by securing the inner sleeve against rotation and axial displacement.
Implementation Method 1
the teeth 15 press into the contact section 8a on the inner sleeve 3a at the end face and cause such a material displacement of the contact section 8a toward the inner sleeve center that the inner sleeve is clamped axially and non-rotatably to the spindle upper part
Implementation Method 2
the centrifugal force unit (8) has a plurality of centrifugal force elements which space the axially displaceable clamping element (6) from the thread separator (4a) as soon as the spindle rotates at a certain minimum speed
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a thread clamping device for a spindle for detachably securing a thread in a clamping gap, comprising a first clamping unit with an inner casing that can be arranged coaxially to the spindle, a thread separator that can be secured in an axial direction on the inner casing, wherein the first clamping unit can be secured on an upper part of the spindle for the purpose of axial positioning, and a second clamping unit having a clamping element that can be adjusted axially relative to the first clamping unit between a clamping position closing the clamping gap between the thread separator and the clamping element and an open position opening the clamping gap. According to the invention, the thread separator is designed to be secured on the spindle upper part for the purpose of axial positioning and designed to be rotationally coupled to the spindle upper part, and the thread separator and the inner casing can be rotationally coupled to one another.