Multiple Load Cell Scanner Scale Weight Measurement
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Solution Overview
Problem
Prior art scanner scale systems face challenges with linearity issues, calibration problems, and long settling times due to their large size and complex assembly, which affect their operational efficiency and accuracy.
Innovation Solution
The system employs multiple small load cells distributed across the scanner base, supported by structural elements, with compressible load mounts that share the weight of the top plate assembly and objects, providing accurate weight readings while minimizing debris entry and allowing for compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single point load cell with a long beam structure is used to support the top plate assembly, then the structural strength and stability are improved, but the device size increases and the complexity of assembly and service procedures increases
Solution Approach 1:
The patent divides the single load cell into multiple smaller load cells (typically four) distributed at corners or strategic positions under the top plate assembly. Each load cell supports a portion of the total weight, eliminating the need for a long beam structure while maintaining structural integrity. This segmentation reduces the physical space required and simplifies assembly and service procedures.
2Force
If a single point load cell with a long beam structure is used, then the weight support capability is improved, but the settling time increases
Solution Approach 1:
By segmenting the single load cell into multiple smaller load cells, each cell has reduced mass and smaller structural components. This allows each load cell to reach equilibrium faster when weight is applied or removed, significantly reducing the overall settling time of the scale while maintaining the same total weight support capability through the combined force of all load cells.
3Stability of the object's composition
If scale components are integrated into the scanner base, then the structural stability is improved, but the scanner size increases to accommodate the scale components
Solution Approach 1:
The patent uses multiple small load cells instead of one large load cell, allowing for a more compact arrangement within the scanner base. The small load cells can be positioned at corners or distributed strategically, requiring minimal space while maintaining structural stability through the distributed support structure. This segmentation enables integration into compact scanner designs without increasing overall scanner footprint.
4Device complexity
If multiple small load cells are used instead of a single point load cell, then the device size is reduced and assembly is simplified, but the measurement precision may be affected
Solution Approach 1:
The patent combines the outputs of multiple individual load cell measurements through signal processing and calibration routines. By merging the data from all load cells and using algorithms to account for their individual characteristics and positions, the system achieves measurement precision equivalent to or better than a single large load cell, while benefiting from the reduced size and simplified assembly of multiple small cells.
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 enhances the accuracy and efficiency of weight measurements by distributing weight evenly, reducing settling times, and simplifying assembly and service procedures, while preventing damage from overloading and maintaining operational integrity.
Implementation Method 1
Each load cell suitably includes a compressible load mount. The load mounts support the weight of the top plate and any object placed on the top plate
Data Source
AI summary
Systems and techniques for scanner scale implementation and operation using a plurality of load cells mounted in a planar arrangement. A plurality of load cells is mounted to a scanner base. The load cells are secured within a mounting chassis in such a way that the load bearing elements of the load cells extend through the protective cover. The mounting chassis and load cells may be mounted to the scanner base. A scanner top plate may be secured to the load cells such that the weight of the scanner top plate and any object placed on the scanner top plate is borne by the load bearing elements of the load cells, part of the weight being borne by the load bearing element of each load cell. Upon presentation of an object for weighing, weight signals generated by the load cells are processed to produce a weight reading for the object.