Mail Width Measurement via Lever-Activated Light Attenuation
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Solution Overview
Problem
Existing mail handling systems require complex and costly technologies to measure the width of mail items for postage pricing, and these systems often need to stop the franking process to perform measurements effectively.
Innovation Solution
A device that measures the width of mail items on the fly using a detector, emitter, receiver, and processor to determine the number of levers activated by the mail item, calculating the width based on light intensity variations, allowing for accurate postage computation without the need for complex or costly systems and continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strips of diodes are used to measure the width of mail items, then measurement capability is achieved, but the system becomes extremely costly
Solution Approach 1:
The measurement system is segmented into multiple independent levers instead of using continuous strips of diodes. Each lever is independently activated by mail items of specific widths, allowing width measurement through discrete lever activation patterns rather than continuous optical sensing arrays.
Solution Approach 2:
The patent replaces the optical detection system (strips of diodes) with a mechanical lever system that is actuated by mail items. The levers mechanically respond to mail item width and trigger optical sensors only when activated, reducing the need for extensive optical sensing coverage.
2Measurement precision
If sophisticated systems are used to determine mail item dimensions, then measurement accuracy is improved, but the system complexity increases
Solution Approach 1:
The mail item itself serves as the actuating mechanism for the measurement system. As the mail item passes through, its width automatically activates the appropriate levers without requiring complex external actuation systems. The system measures dimensions through the natural interaction between mail items and the lever array.
Solution Approach 2:
The system uses the physical parameter of mail item width to directly activate corresponding levers. The width dimension is converted into a discrete activation pattern across the lever array, where each lever position corresponds to a specific width range, simplifying the measurement process.
3Measurement precision
If traditional measurement systems are used, then width measurement is achieved, but the franking process must be stopped
Solution Approach 1:
The measurement system operates continuously as mail items pass through the franking machine without interruption. The levers are activated in real-time during mail item transport, and the optical sensors detect lever positions continuously, enabling width measurement without stopping the franking process.
Solution Approach 2:
The width measurement is performed preliminarily during the natural transport of mail items through the machine. The lever activation and optical detection occur while mail items are already in motion on the conveyor, allowing measurement data to be captured before the franking operation begins.
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 accurate and efficient measurement of mail item width in real-time, facilitating precise postage calculation without halting the franking process, using a single emitter/receiver combination and mechanical levers, reducing operational costs and complexity.
Implementation Method 1
Device for measuring width by light attenuation difference
Data Source
AI summary
A device for measuring the width L of a mail item on the fly in a mail handling machine in which mail items are caused to move parallel to a reference wall, the device comprising: a detector device rendered active when the presence of a mail item passing over a plurality of levers is detected, said levers being disposed at a determined set pitch perpendicularly to said reference wall; an emitter device for emitting a light ray, which emitter device is disposed facing a first lever of said plurality; a receiver device for receiving said light ray; a measurement device for measuring the light intensity of the light ray received at said receiver device; and a processor device for computing a determined number y of levers activated by said mail item going past, on the basis of a comparison between said measurement of the received light intensity and an initial measurement of the light intensity of the light ray received at said receiver device when no mail items pass over said plurality of levers, the width L of a mail item being determined on the basis of the number y of levers activated by the mail item going past.