Dynamic Scale Control for Flat Goods Weighing
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Solution Overview
Problem
Existing dynamic scales in franking systems face challenges in achieving high throughput and accurate weight measurement for flat goods lying on their side, due to limitations in transport speed control, sensor requirements, and material costs, leading to inefficient processing and increased processing time.
Innovation Solution
A method and arrangement for controlling a dynamic scale with a shortened weighing plate and a simplified control system using three optoelectronic sensors and a microcomputer, which continuously counts encoder pulses to adjust transport speed and ensure valid weight measurements without the need for transporting goods back, optimizing throughput and reducing material and financial costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport speed is increased to achieve high throughput, then the processing capacity increases, but the measurement precision deteriorates because the flat goods cannot be weighed accurately at high speeds
Solution Approach 1:
The patent implements dynamic speed adjustment during the weighing process. The transport unit receives control signals to gradually reduce transport speed from an initial high speed to a final low speed while the flat good is on the weighing pan. This allows the system to maintain high throughput by starting with high speed, then slowing down only when necessary for accurate measurement, and finally stopping to complete the weighing. The dynamic speed control resolves the contradiction by making the speed adaptive rather than static throughout the entire process.
2Adaptability or versatility
If the weighing plate length is increased to accommodate longer flat goods, then the adaptability improves, but the device complexity and material costs increase
Solution Approach 1:
The patent uses dynamic speed adjustment combined with a shortened weighing plate to achieve compatibility with different flat good formats. By reducing the transport speed progressively during the weighing process, the system compensates for the shorter plate length, ensuring that even long flat goods remain on the plate long enough for accurate measurement. This eliminates the need to physically extend the weighing plate for different formats, maintaining adaptability while reducing device complexity and material costs.
Solution Approach 2:
The patent changes the transport speed parameter dynamically during the weighing process to accommodate different flat good lengths. Instead of changing the physical dimension of the weighing plate, the system adjusts the speed parameter to ensure adequate measurement time for all formats. This parameter-based adaptation resolves the contradiction by achieving format versatility through control parameters rather than physical modifications.
3Measurement precision
If the transport speed is reduced to ensure accurate weight measurement, then the measurement precision improves, but the productivity decreases
Solution Approach 1:
The patent implements a periodic speed adjustment pattern: high speed for transport, gradual reduction to low speed for measurement, and stop for weighing completion. This periodic variation in speed allows the system to maintain high throughput during transport phases while ensuring accurate measurement during the reduced-speed phases. The alternating speed patterns resolve the contradiction by separating the high-speed transport function from the low-speed measurement function in time.
4Measurement precision
If a complex sensor array is used to determine flat good dimensions, then the measurement precision improves, but the device complexity and material costs increase
Solution Approach 1:
The patent extracts and removes the complex sensor array for dimension determination from the weighing system. Instead of using multiple sensors to measure flat good dimensions, the system relies on the known or pre-recorded format information and uses dynamic speed adjustment to accommodate different formats. This extraction of the unnecessary sensor array reduces device complexity and material costs while maintaining measurement precision through the alternative speed-control approach.
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 solution enables reproducible, efficient weight measurement for all flat goods formats, minimizing processing time and increasing throughput without the need for complex sensor arrays or extensive material modifications, thus enhancing the operational efficiency of the franking system.
Implementation Method 1
providing a load cell (27) for measuring the weight of a moved flat good
Implementation Method 2
A method and arrangement for controlling a dynamic scale with a shortened weighing plate and a simplified control system using three optoelectronic sensors
Data Source
Figure 1~2
Figure 3~4a
Figure 4b~5d
AI summary
The method for controlling a dynamic scale for flat goods lying on their side comprises controlling the transport of the flat goods and features continuous counting of encoder pulses and weight measurement of a moving flat good, which is initiated when the trailing edge of the flat good reaches a first sensor. An initial counter reading W1 is stored when the leading edge of a flat good reaches a second sensor, but no valid weight measurement is obtained. Then, a step (111) of the method is reached in which a weight measurement is performed at a progressively reduced transport speed. After each reduction in the transport speed of the flat good, a subsequent weight measurement is performed at the next lower transport speed. The current counter reading is then checked if neither a valid weight measurement nor a weight measurement can be obtained.that the trailing edge of the flat item reaches the first sensor, even though the leading edge of a flat item has reached a second sensor, as well as checking whether the current counter reading corresponds to a sum of the stored counter reading and a predetermined count value, and repeating the queries and substeps of the step after the check, as long as the current counter reading has not yet reached the sum, and with a further gradation of the transport speed of the flat item and validity check of the weight measurement result in at least one further step (113, ..., 119), if the current counter reading reaches the sum.