Pivotable Comb Die with Ceramic Coating for Mail Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mail processing systems face issues with double envelope passages, leading to over-billing, non-postage, and damage to thick mail items, particularly those with windows, due to inadequate selection mechanisms.
Innovation Solution
A mail item selection device featuring a pivotable comb-shaped first die with ceramic-coated teeth and an optional second die with elastomer blades, allowing for precise selection and reduced wear, minimizing double passages to less than 1 in 1000.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single die is used to select mail items, then the device complexity is reduced, but double passages occur frequently causing over-billing and damage to thick mail items
Solution Approach 1:
The selection device is divided into two independent dies: a first die with wear-resistant material for initial selection and a second die with compliant material for final selection. This segmentation allows each die to perform a specific function, reducing double passages while maintaining manageable device complexity
Solution Approach 2:
Different materials are applied to different dies based on their specific functions. The first die uses wear-resistant material (ceramic, carbide, or metal) to handle thick mail items without damage, while the second die uses compliant material (elastomer or rubber) to gently select thin mail items. This local differentiation of material properties optimizes selection accuracy for various mail item types
2Reliability
If significant force is applied by the die to prevent double passages of thin mail items, then selection reliability improves, but thick mail items with windows risk being damaged or torn
Solution Approach 1:
The first die is specifically designed with wear-resistant material to apply higher forces suitable for thick mail items, while the second die uses compliant material to apply gentler forces for thin mail items. This localized differentiation of material properties prevents damage to vulnerable mail items while maintaining effectiveness for thicker items
Solution Approach 2:
Instead of using a single die that must compromise between thin and thick item handling, the invention reverses the conventional approach by using two dies with opposite material characteristics. The first die handles thick items with durable material, and the second die handles thin items with compliant material, eliminating the need to choose a single compromise solution
3Reliability
If a second die is added to improve selection quality, then double passages are reduced, but the device complexity and cost increase
Solution Approach 1:
The selection function is segmented into two stages with two dies, each optimized for specific mail item types. This segmentation improves selection quality by reducing double passages while keeping each individual die relatively simple in structure, making the overall complexity manageable
Solution Approach 2:
The two-die system serves multiple functions: the first die handles thick mail items and initial selection, while the second die handles thin mail items and final selection. This multi-functionality justifies the added complexity by providing comprehensive coverage for different mail item types in a single integrated system
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 effectively reduces double envelope passages, enhances selection quality for thin items, and prevents damage to fragile mail items by using wear-resistant ceramic materials and elastomer blades, reducing feeder downtime and maintaining selection accuracy.
Implementation Method 1
said first die being pivotable about a first axis of rotation against a first means elastic return and having the shape of a comb
Implementation Method 2
one end of which at least one tooth is coated with a wear-resistant material
Implementation Method 3
cooperating with a plurality of opposed pick rollers to select said mail items one by one and convey them downstream
Data Source
Figure 1~2
AI summary
Mail item selection device for separating mail items one by one from a pile of mail items and transporting them downstream, the device comprising at least one first die (12) cooperating with a plurality of opposing selection rollers (16A, 16B, 16C) to select these mail items one by one and transport them downstream, the first die being able to pivot about a first axis of rotation (18) against a first elastic return means (20A, 20B) and having a comb shape of which one end of at least one tooth is coated with a wear-resistant material (12A).