Mail Sorting Gap Length Control via Sensor Feedback
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Solution Overview
Problem
Existing mail sorting systems face challenges in maintaining consistent gap length between mail pieces throughout the transport path, leading to potential system stoppages and inefficiencies due to variations in feeder output and belt tension, which are not effectively controlled by current methods.
Innovation Solution
A system and method that employs sensors along the mail piece transport path to measure and track gap length and mail piece length, using this data to control the operation of devices such as diverters and printers through a processor/controller, ensuring adequate gap lengths and preventing jams and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gap length is controlled by feeder pitch setting, then minimum gap length is maintained at feeder output, but gap length variations occur throughout the transport path due to belt tension changes and mail piece characteristics
Solution Approach 1:
The system uses sensors to continuously measure actual gap lengths at multiple points along the transport path and feeds this information back to the controller. The controller then adjusts feeder pitch settings and diverter timing based on real-time gap measurements, creating a closed-loop control system that maintains consistent gap lengths despite variations in belt tension and mail piece characteristics.
Solution Approach 2:
The system dynamically adjusts operational parameters such as feeder pitch and diverter activation timing based on real-time gap measurements. Instead of using fixed pitch settings, the controller modifies these parameters on-the-fly to compensate for changing conditions in the transport path, ensuring optimal gap control throughout system operation.
2Productivity
If high speed mail processing is implemented, then productivity increases, but gap length control becomes more difficult leading to system stoppages
Solution Approach 1:
The system measures gap lengths at multiple upstream points before mail pieces reach critical sections of the transport path. Based on these preliminary measurements, the controller proactively adjusts diverter timing and feeder pitch to ensure adequate gap lengths are maintained, preventing potential stoppages before they occur.
Solution Approach 2:
Real-time gap measurements from sensors positioned along the high-speed transport path provide continuous feedback to the controller. This enables the system to maintain precise gap control even at elevated processing speeds, allowing productivity increases without sacrificing system continuity or risking stoppages.
3Reliability
If multiple sensors are positioned along the transport path for gap measurement, then gap length control is improved, but system complexity increases
Solution Approach 1:
The transport path is divided into multiple measurement zones with sensors positioned at strategic locations. Each sensor monitors gap lengths in its specific zone, and the controller processes these segmented measurements to make localized adjustments. This segmentation approach improves gap control reliability without requiring a single complex centralized measurement system.
4Device complexity
If fixed pitch feeder operation is used, then device complexity is minimized, but gap length variations occur due to belt tension changes and mail piece characteristics
Solution Approach 1:
The feeder system uses real-time gap measurements from sensors to automatically adjust its own pitch settings without external intervention. The controller receives gap length data and modifies feeder operation accordingly, enabling the system to self-correct gap variations caused by belt tension changes and mail piece characteristics, thereby improving reliability without significantly increasing complexity.
Data Source
AI summary
The present subject matter relates generally to a system and method for controlling functions in a mail sorting system based on gap length measurement and tracking. The system and method includes a plurality of sensors located along one or more mail piece transport paths. The sensors are used to collect data regarding the gap length between each mail piece transported through the system. The gap length data is processed and stored within a controller/processor that uses the gap lengths to control the operation of one or more devices within the mail sorting system. For example, the gap lengths may be used to control the operation of a diverter, a printer or any other electromechanical, hardware or software device. The gap lengths can be used to trigger and/or inhibit the operation of the one or more devices.