Tray Transfer System for Mail Sorting Floor Space Reduction
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Solution Overview
Problem
The existing mail handling systems, such as the AFSM100™ flats sorting machine, face challenges in efficiently transferring and storing automation compatible trays (ACTs) due to space constraints and varying processing rates, leading to periodic lag times and inefficiencies in mail sorting operations.
Innovation Solution
A gantry-based and conveyor-based tray transfer system that includes a dolly, an overhead manipulator, and a dolly docking bay for automatic transfer of ACTs between dollies and conveyors, enabling flexible storage, loading, and unloading, with features like a rectangular end effector for multiple tray handling and a dolly cap for efficient stacking and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mail pre-processing is performed at the same location as the flats sorting machine, then processing efficiency is improved, but floor space availability deteriorates due to insufficient space
Solution Approach 1:
The patent introduces a vertical stacking dimension by implementing multi-level tray storage racks and vertically stacked dolly configurations. Instead of expanding horizontally to accommodate both pre-processing and sorting operations, the system utilizes vertical space through stacked tray racks and multi-level dollies, thereby resolving the floor space constraint while maintaining processing efficiency
Solution Approach 2:
The patent introduces dollies as intermediary transport devices between the pre-processing area and the flats sorting machine. These dollies serve as mobile buffer storage and transport carriers, allowing trays to be moved efficiently between locations without requiring continuous floor space allocation at the sorting machine location, thus resolving the space availability issue
2Extent of automation
If automated tray transfer systems are implemented, then labor requirements are reduced, but system complexity increases
Solution Approach 1:
The patent implements self-service automation features including automatic tray recognition systems that identify tray contents and routing requirements, automatic dolly positioning systems that navigate to correct locations, and self-balancing mechanisms that stabilize stacked dollies. These self-service capabilities reduce the need for complex control systems and manual intervention while maintaining high automation levels
Solution Approach 2:
The patent utilizes parameter changes in the form of programmable control parameters that can be adjusted based on mail volume, tray sizes, and processing requirements. The system allows dynamic modification of transfer speeds, stacking heights, and routing parameters without requiring hardware changes, thereby managing system complexity while maintaining flexibility and automation
3Reliability
If buffer storage for trays is implemented, then processing rate mismatches are resolved, but storage cost increases
Solution Approach 1:
The patent implements dynamic buffer storage capacity that adjusts based on real-time processing rate mismatches between pre-processing and sorting operations. The system monitors tray accumulation rates and dynamically adjusts buffer allocation, releasing stored trays when sorting capacity becomes available. This dynamic approach ensures reliable processing rate matching while minimizing the average storage capacity required compared to static buffer systems
Data Source
AI summary
The present invention relates to a tray transfer system (TTS). This system is designed to automatically transfer trays of mail between dollies and conveyor belts. The TTS is an efficient method for shipping, moving, storing, loading, and unloading mail trays. It allows mail-processing centers to physically and temporally separate the process of sorting mail and the process of moving mail into automation compatible trays (ACT).