Retail Scale Load Cell Access With Tamper-Evident Calibration Memory
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Solution Overview
Problem
Existing retail weighing scales face challenges in ensuring that calibration-relevant data are not manipulated without breaching the calibration seal, particularly when load cell replacements or modifications occur, as current designs lack effective mechanisms to trace and prevent unauthorized changes.
Innovation Solution
A retail weighing scale design featuring a weighing module with a load cell housed in a housing, where a removable cover secured by a calibration mark protects the memory containing calibration data, and a sensor system ensures that unauthorized access to the memory is detected by breaching the calibration mark, thereby preventing unauthorized modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the housing is open upward in the region of the load cell to allow access for maintenance or replacement, then ease of operation is improved, but manipulation of calibration-relevant data becomes more accessible and reliability deteriorates
Solution Approach 1:
The housing is segmented into an upper removable cover and a lower fixed portion. The upper cover can be removed to provide access to the load cell for maintenance or replacement, while the lower fixed portion contains the memory with calibration-relevant data. This segmentation allows easy access for operational purposes while maintaining protection for critical calibration data through the fixed lower portion.
2Ease of operation
If calibration-relevant data are stored in accessible memory for easy reading, then ease of operation is improved, but unauthorized manipulation becomes easier and reliability deteriorates
Solution Approach 1:
A transparent or translucent window is introduced as an intermediary element in the upper housing cover. This window allows visual inspection and reading of calibration-relevant data stored in the memory without requiring physical access to the memory components. The window mediates between the need for data accessibility and the need to prevent manipulation, enabling read-only access while maintaining protection.
3Ease of operation
If the calibration seal is made visible for easy verification, then ease of operation is improved, but the seal becomes more vulnerable to tampering and reliability deteriorates
Solution Approach 1:
The calibration seal is nested within the transparent or translucent window of the upper housing cover. The seal is positioned inside the housing but remains visible through the window material. This nesting arrangement allows the seal to be visually verified for compliance purposes while simultaneously protecting it from direct physical contact and tampering, as the window acts as a protective barrier.
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
The design effectively prevents unauthorized manipulation of calibration data by ensuring that any attempt to modify the calibration data results in a visible breach of the calibration mark, maintaining compliance with regulatory standards and ensuring the scale's accuracy.
Implementation Method 1
The deformation portion has at least one strain gauge for measuring a weight acting on the platter
Data Source
AI summary
A weighing scale includes a weighing module having a load cell in a housing. The load cell has fixed, deformation, and movable portions. The fixed portion is connected to the housing, and the movable portion bears a spider bearing a platter. The housing is open upward in a region of the load cell. The housing is closed by the platter and by edges of the platter which protrude downward beyond the top edge of the housing. The deformation portion has a strain gauge for measuring a weight acting on the platter. A printed circuit board includes electronics for processing a signal from the strain gauge. The electronics include memory storing calibration-data of the load cell. A removable cover is fastened to the fixed portion by a first fastener secured by a calibration mark, and protects the memory of the printed circuit board against manipulation of calibration data.