Segmented Measuring Roll for Transverse Web Tension Mapping
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Solution Overview
Problem
Conventional force measuring devices measure web tension only over the full roll width, failing to provide precise information about the distribution of web tension along the transverse direction of a running web, which is necessary for further processing of cut webs.
Innovation Solution
A segmented measuring roll with slidable and lockable measuring segments, each equipped with a load cell, allows for precise measurement of web tension distribution along the transverse direction by conducting measuring signals via electrical conductors to an evaluation unit, with strain gauges measuring mechanical tension through a double-bending beam configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional force measuring device measures web tension over the full roll width, then the measurement covers the entire material web, but it fails to provide precise information about the distribution of web tension along the transverse direction
Solution Approach 1:
The measuring roll is divided into multiple independently movable measuring segments, each equipped with its own load cell. This segmentation allows each segment to measure web tension at specific transverse positions independently, providing detailed distribution information while keeping each segment's structure relatively simple and manageable.
Solution Approach 2:
The invention transitions from a single-point or full-width measurement approach to a multi-point transverse distribution measurement by arranging measuring segments along the transverse direction. This dimensional expansion enables precise mapping of web tension distribution across the web width.
2Measurement precision
If multiple measuring segments are positioned along the transverse direction to measure web tension distribution, then precise transverse tension information is obtained, but the device complexity increases
Solution Approach 1:
Each measuring segment is designed as a universal module that can be positioned at different transverse locations and serves the same measurement function. This modular universality reduces overall device complexity by using standardized components rather than custom-designed segments for each position.
Solution Approach 2:
The measuring segments are designed to be independently movable along the axle, allowing dynamic adjustment of their positions. This dynamic capability enables flexible measurement configurations without requiring a fixed complex structure, and segments can be repositioned or removed as needed.
3Adaptability or versatility
If measuring segments are made movable on the axle to adjust measuring positions, then flexibility in measuring positions is achieved, but the reliability of signal conduction may be compromised
Solution Approach 1:
Sliding contacts serve as intermediaries between the movable measuring segments and the stationary electrical conductors on the axle. These sliding contacts maintain continuous electrical connection while allowing the measuring segments to move freely along the axle, thus preserving both mobility and signal 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
Enables precise measurement of web tension in both cut and uncut material webs, allowing for individual control of winding processes and reducing waste by optimizing tension conditions, and facilitating uniform tension profiles.
Implementation Method 1
strain gauges measuring mechanical tension through a double-bending beam configuration
Data Source
AI summary
The present invention relates to a force measuring device (20) for measuring web tensions of a running material web (10) that comprises a longitudinal direction defined by the running direction, and a transverse direction, the force measuring device (20) comprising an axle (22) and, supported on the axle, a measuring roll (30) wrapped around by the material web. Here, according to the present invention, it is provided that the measuring roll is formed as a segmented measuring roll (30) having two or more measuring segments (32) that are slidable separately on the axle (22) and are lockable in a measuring position on the axle in order to position the measuring segments (32) in the transverse direction of the material web (10) in accordance with desired measuring positions such that longitudinal sections (12) of the material web wrap around one measuring segment (32) each. The measuring segments (32) each comprise a load cell (36) that serves to determine the web tension of the longitudinal section (12) of the material web wrapped around the respective measuring segment (32) and that provides a mount with which the measuring segment (32) sits on the axle (22). The axle (22) is furnished with electrical conductors that extend substantially in the axial direction across the entire width (26), that are contactable at every position axially and with which the measuring signals provided by the load cells (36) of the measuring segments (22) are conductible to an evaluation unit arranged at an axle end (28).