Spool spindle clamping device with circumferential flat springs
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Solution Overview
Problem
Conventional winding spindles face limitations in load-bearing capacity and flexural rigidity, leading to increased resonance vibrations, particularly in long overhanging configurations, without the ability to enhance these properties without additional support means.
Innovation Solution
The use of flat coil springs aligned circumferentially around the annular piston, with meandering or zigzag windings and curvature adapted to the annular piston diameter, reduces the installation space and allows for a larger hollow spindle diameter, enabling increased load-bearing capacity while minimizing the clamping device's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional cylindrical springs are used in the clamping device, then sufficient spring force can be achieved, but the installation space and height of the clamping device increase significantly
Solution Approach 1:
The patent transitions from conventional cylindrical springs with coils arranged axially to flat plate springs with coils arranged in a plane perpendicular to the axial direction. This dimensional reorientation allows the spring to generate sufficient force while occupying minimal axial space, reducing the clamping device height by more than 40%.
Solution Approach 2:
The patent modifies the spring geometry parameters by changing from cylindrical to flat plate configuration, and by adjusting the coil arrangement from axial to planar. These parameter changes enable the spring to maintain adequate force output while dramatically reducing the installation space required, particularly in the axial dimension.
2Strength
If the hollow spindle diameter is increased to improve load-bearing capacity, then flexural rigidity increases, but the overall outer diameter of the winding spindle increases
Solution Approach 1:
By reorienting the spring coils from axial to planar arrangement, the patent frees up axial space that can be reallocated to increase the hollow spindle diameter. This dimensional change enables the hollow spindle to be optimized for load-bearing capacity without increasing the overall outer diameter envelope of the winding spindle.
3Volume of moving object
If the clamping device is made more compact to reduce installation space, then the hollow spindle diameter can be maximized, but the spring force may be insufficient
Solution Approach 1:
The patent achieves the dual objective of compactness and sufficient force by changing the spring geometry parameters - specifically transitioning to a flat plate configuration with planar coils. This allows the spring to be compact in the axial dimension while maintaining adequate force output through optimized coil geometry and material properties.
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 configuration significantly enhances the load-bearing capacity of the winding spindle, reduces the installation space for the clamping device by over 40%, and allows for a more compact design, effectively addressing the issue of resonance vibrations by optimizing the spring characteristics and distribution around the circumference.
Implementation Method 1
a plurality of flat springs (18) acting on the annular piston (12) in a clamping direction towards the hollow spindle (2)
Implementation Method 2
A pressure fluid is preferably used for this purpose, which is conducted by means of a pressure source into a pressure chamber which is directly delimited by a pressure surface of the annular piston (12)
Data Source
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AI summary
The invention relates to a spool spindle for a winding machine, comprising an outer jacket bushing (1) for receiving at least one spool sleeve (24). In order to fix the spool sleeve, a clamping device (16) is provided, which is arranged concentrically beneath the jacket bushing on the circumference of a drivable hollow spindle (2). For this purpose, the clamping device comprises a plurality of clamping bodies (18), which are guided in openings (19) of the jacket bushing and which can be moved radially by at least one axially displaceable ring piston (12) so as to tension or relax the spool sleeve (24), wherein the ring piston is arranged inside an annular space formed between the jacket bushing and the hollow spindle and is held in the tensioned position by a plurality of springs. In order to obtain the highest possible carrying capacity for a predefined outside diameter of the spool spindle, according to the invention each of the springs comprises a plurality of flat windings (25) that are oriented in the circumferential direction of the ring piston. In this way, the installation height of the clamping device can be minimized, even when using a plurality of springs.