Ball-Loaded Flexible Bag Separator for Mailpiece Separation
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Solution Overview
Problem
Existing franking machines face challenges in efficiently separating mailpieces of varying thickness and weight without causing bunching, which leads to over-invoicing and under-franking, and their complex mechanisms are difficult to adjust for high throughput rates, potentially damaging thicker mailpieces with windows.
Innovation Solution
A separator device featuring a flexible trapezium-shaped bag with balls that adapts to mailpiece thickness by deforming under a drive member, such as a motor-driven belt or rollers, allowing continuous pressure adjustment for effective separation without pre-sorting, using materials like nylon and metal, glass, or elastomer balls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compression spring is used to press the guide against mailpieces to prevent bunching, then separation reliability is improved, but mailpieces of high thickness may be damaged or torn
Solution Approach 1:
The patent replaces the static compression spring mechanism with a dynamic ball-based system where balls are fed sequentially onto the mailpiece surface. The balls provide adaptive pressure that responds to mailpiece thickness in real-time, preventing damage to thick mailpieces while maintaining separation reliability. The balls move and adjust their position dynamically based on the contours of each mailpiece.
Solution Approach 2:
The invention changes the pressure application mechanism from a continuous spring force to discrete ball contacts. By controlling the feed rate and size of balls, the system adjusts the pressure parameters adaptively. This allows the pressure to be sufficient for thin mailpieces to prevent bunching while being automatically reduced for thick mailpieces to avoid damage.
2Manufacturing precision
If the guide pressure is increased to reduce bunching for thin mailpieces, then separation quality is improved, but thick mailpieces may be damaged
Solution Approach 1:
The patent applies pressure locally through individual balls rather than through a continuous guide. Each ball contacts only the specific area of the mailpiece it reaches, providing localized pressure exactly where needed for separation. This local application of force prevents unnecessary pressure on areas of thick mailpieces that do not require it, maintaining separation quality while avoiding damage.
Solution Approach 2:
The ball feed system is self-regulating based on mailpiece thickness. Balls are fed onto the mailpiece surface and naturally adjust their positions and contact forces according to the contours and thickness variations of each mailpiece. The system automatically provides appropriate pressure without external control, achieving both high separation quality and damage prevention.
3Adaptability or versatility
If complex guide mechanisms are used to accommodate various mailpiece formats and thicknesses, then adaptability is improved, but device complexity increases and adjustment becomes difficult
Solution Approach 1:
The ball feed system requires no adjustment or programming to adapt to different mailpiece formats, thicknesses, or weights. The balls naturally self-adjust their positions and contact forces based on the physical characteristics of each mailpiece. This self-service capability provides universal adaptability while maintaining extremely simple device architecture with no complex mechanisms or adjustment procedures.
4Productivity
If the guide is pressed against mailpieces with large force to prevent bunching at high throughput rates, then productivity is maintained, but mailpiece damage increases
Solution Approach 1:
The ball feed system provides dynamic pressure adjustment that responds to mailpiece thickness in real-time during high-speed operation. Balls are fed continuously at rates matching high throughput requirements, maintaining constant separation force for thin mailpieces while automatically reducing pressure on thick mailpieces. This dynamic adaptation enables high productivity without increasing damage risk.
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 ensures improved separation quality for both thin and thick envelopes by dynamically adjusting pressure, reducing the need for complex adjustments and minimizing damage, while maintaining high throughput rates without bunching.
Implementation Method 1
at least one flexible bag provided with balls and co-operating with a drive member so that, by deforming while said flat articles are being conveyed downstream, it separates said flat articles one-by-one
Data Source
AI summary
A separator device for separating flat articles one-by-one from a stack of flat articles and for conveying them downstream, said separator device comprising at least one flexible bag provided with a plurality of balls and co-operating with a drive member so that, by deforming while said flat articles are being conveyed downstream, it separates said flat articles one-by-one. A particular application lies in separating mailpieces.