Web Deflection Device Using Cube Diagonal Geometry
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Solution Overview
Problem
Existing methods for deflecting a moving web by 90°, such as using a fixed entraining bar at 45°, result in significant tension variations between the incoming and outgoing web due to high friction forces, which are not optimally reduced by conventional methods like air jets or low-friction coatings.
Innovation Solution
A method involving a deflecting device with idler rollers and a stationary rod oriented along the diagonal of a cube, where the incoming and outgoing web planes are parallel, reducing the angle of wrap and thus minimizing tension variation by maintaining transverse stability and aligning with the cube's geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a fixed entraining bar at 45° is used to deflect the web, then the web can be redirected by 90°, but intense friction forces are generated causing significant tension variation between incoming and outgoing web
Solution Approach 1:
The single 45° entraining bar is segmented into three separate deflecting elements: a first element (roller or bar) oriented at one angle, a second element (roller or bar) oriented at another angle, and a third element (stationary rod or bar) oriented at a third angle. This segmentation distributes the deflection function across multiple elements, reducing the friction force concentration and tension variation on any single element.
Solution Approach 2:
The invention transitions from a two-dimensional planar deflection (single bar in one plane) to a three-dimensional spatial arrangement where deflecting elements are oriented at different angles and positions in space. The first, second, and third deflecting elements are arranged in a spatial configuration that distributes the web path through multiple dimensions, reducing the angle of wrap and friction forces on each individual element.
2Object-generated harmful factors
If conventional methods like air jets or low-friction coatings are applied to the deflecting bar, then friction is reduced to some extent, but acceptable but not optimal results are obtained
Solution Approach 1:
Rather than attempting to reduce friction on a single bar through coatings or air jets, the invention segments the deflection function across three separate elements. This structural segmentation fundamentally reduces the friction force requirement for each element, achieving superior friction reduction without relying on conventional surface treatment methods.
3Force
If the angle of wrap on the deflecting bar is reduced, then tension variation decreases, but the web path geometry becomes more complex
Solution Approach 1:
The complex web path geometry is managed by segmenting it into three distinct, manageable sections, each interacting with a separate deflecting element. This segmentation makes the overall complex path easier to design, analyze, and implement compared to a single complex deflection point.
Solution Approach 2:
The invention utilizes three-dimensional spatial arrangement of the deflecting elements to achieve reduced angle of wrap on each element. By distributing the deflection through space rather than confining it to a single plane, the web path geometry becomes more manageable despite the increased spatial complexity.
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 approach reduces the tension variation between the web's entry and exit by 46%, improving upon traditional solutions by maintaining consistent web path lengths and reducing the force required for deflection.
Implementation Method 1
μ is the coefficient of friction between the surface of the bar and the band
Data Source
Figure 1
AI summary
A method for deflecting a moving web (W), comprising the steps of deflecting the moving web (W) about three axes (18, 20, 22), two of which (18, 20) are set according to two mutually orthogonal sides (CD, EG) of a cube (Cu), set on two opposite faces (F1, F2) of said cube (Cu), and in which the third axis (22) is set according to a diagonal (E) of said cube (Cu) that joins said sides (CD, EG).