Compliant Vacuum Conveyance for Varying Mailpiece Thickness
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Solution Overview
Problem
Existing mailpiece processing systems struggle to handle consecutive mailpieces of varying thickness dimensions due to limitations in vacuum conveyance and print head clearance, leading to jamming and inefficiencies in printing operations.
Innovation Solution
A compliant conveyance system with a flexible vacuum manifold, featuring a conveyor belt and a compliant deck with high elongation, low modulus material and high yield strength, high modulus material layers, which accommodates thickness variations and maintains a consistent vacuum differential, allowing for the processing of mailpieces with varying thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid conveyance system with fixed clearance gap is used, then printing precision is improved, but adaptability to varying mailpiece thickness is worsened
Solution Approach 1:
The patent applies the dynamics principle by making the conveyance system adaptable through vacuum pressure control. The clearance gap between the conveyance belt and registration plate is not fixed but dynamically adjusted by controlling vacuum pressure, allowing the system to accommodate varying mailpiece thickness while maintaining printing precision.
Solution Approach 2:
The patent applies parameter changes by varying the vacuum pressure level to adjust the effective clearance gap. By changing the vacuum pressure parameter, the system can accommodate different mailpiece thicknesses while maintaining consistent printing quality, resolving the contradiction between precision and adaptability.
2Reliability
If vacuum pressure is increased to improve mailpiece engagement, then conveyance reliability is improved, but deformation of the conveyance belt is worsened
Solution Approach 1:
The patent applies local quality by providing localized support structures (support decks or ribs) at specific locations beneath the conveyance belt. These localized supports prevent excessive deformation in critical areas while allowing the belt to maintain proper engagement with mailpieces through vacuum pressure, thus resolving the contradiction between reliability and shape stability.
3Adaptability or versatility
If the clearance gap is reduced to handle thinner mailpieces, then adaptability is improved, but printing precision is worsened
Solution Approach 1:
The patent applies dynamics by using vacuum pressure control to dynamically adjust the clearance gap. When handling thin mailpieces, the vacuum pressure is reduced to increase the effective clearance, allowing thin items to pass through without deformation while maintaining sufficient standing height for precise printing operations.
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 system effectively processes mailpieces of varying thickness without jamming, ensuring smooth operation and increased throughput by maintaining a robust vacuum conveyance while accommodating thickness variations, thus enhancing the reliability and flexibility of the mailpiece processing system.
Implementation Method 1
The vacuum conveyance/manifold system develops a pressure differential across each of the mailpieces to urge each mailpiece into frictional engagement with one or more conveyor belts
Implementation Method 2
urge each mailpiece into frictional engagement with one or more conveyor belts
Implementation Method 3
a vacuum source by a combination of apertures, conduits and plenums
Implementation Method 4
develops a pressure differential across each of the mailpieces
Data Source
AI summary
A vacuum conveyance/manifold system is provided for processing mailpieces. The vacuum conveyance/manifold system includes at least one conveyor belt and a compliant deck disposed beneath and supporting an underside surface of the conveyor belt. The conveyor belt has rows of aligned apertures disposed therein and a drive surface for engaging a face surface of each of the mailpieces. The compliant deck defines a neutral axis in bending and has a high elongation, low modulus material in a portion of the deck which is distal from the bending neutral axis, and a high yield strength, high modulus material in a portion of the deck which lies coincident with the bending neutral axis. Furthermore, the compliant deck has a plurality of elongate slots formed in the high elongation, low modulus material, which elongate slots are aligned, and in fluid communication, with the rows of apertures in the conveyor belt. A flexible manifold system, having a plurality of flexible tubes, is in fluid communication with the elongate slots of the compliant deck and the vacuum source for developing a pressure differential across each of the mailpieces when in contact with the drive surface of the conveyor belt.