Mailpiece Feed Device Angular Delay Drive Rollers
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Solution Overview
Problem
Existing mail-handling systems face issues with envelope jogging, where improper positioning leads to braking and potential damage, especially with thin or tall/heavy stacks, due to the existing methods of using inclined conveyor rollers and additional re-jogging rollers.
Innovation Solution
A mailpiece feed device with drive rollers inclined at an angle and a specific drive mechanism where the second drive roller is rotated with a predetermined delay relative to the first, and optionally a third roller with a further delay, allowing envelopes to pivot smoothly into alignment with the referencing wall without sudden abutment, using a pusher and drive abutment system with angular offsets and return springs for efficient envelope alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inclined conveyor rollers are used to jog envelopes diagonally towards the referencing wall, then envelope positioning is improved, but envelope braking and potential damage occur
Solution Approach 1:
The conveyor system is segmented into multiple independent rollers (first conveyor roller, second conveyor roller, third conveyor roller) that can be controlled separately. This allows the jogging action to be divided into multiple stages with different forces and angles, preventing sudden braking forces that damage envelopes.
Solution Approach 2:
The system dynamically adjusts the rotation timing of different rollers through a phase shift mechanism. The second conveyor roller rotates with a phase advance relative to the first, creating a dynamic jogging force that guides envelopes smoothly without sudden impacts. The inclined configuration (angle α between 0° and 45°) provides dynamic control over the jogging force vector.
2Manufacturing precision
If re-jogging rollers disposed perpendicularly are added to correct jogging defects, then envelope alignment is improved, but envelope braking increases
Solution Approach 1:
The system uses asymmetric roller configuration where the second conveyor roller is positioned at a perpendicular offset (distance e) from the line connecting the first and third rollers. This asymmetric arrangement creates a natural jogging component that corrects alignment without requiring additional perpendicular rollers, thereby avoiding the braking effect associated with such rollers.
Solution Approach 2:
The phase advance mechanism causes the second conveyor roller to rotate before the first and third rollers, creating a preliminary jogging action that pre-aligns envelopes before they reach the referencing wall. This preliminary correction eliminates the need for subsequent strong re-jogging forces that would cause braking.
3Manufacturing precision
If the force exerted by conveyor rollers is increased to improve jogging effectiveness, then envelope positioning is improved, but the risk of damage to thin envelopes increases
Solution Approach 1:
Different rollers apply different local forces to the envelope at different positions and times. The inclined rollers (first and third) provide gentle guiding forces, while the offset second roller provides localized jogging force only where needed. This distributed, localized force application achieves effective jogging without concentrating excessive force that would damage thin envelopes.
Solution Approach 2:
The phase-shifted rotation of the second conveyor roller creates a periodic jogging action that occurs in cycles rather than continuously. This periodic force application allows envelopes to be jogged effectively through repeated gentle nudge s rather than a single strong force, reducing the risk of damage to thin envelopes.
Data Source
AI summary
A feeder for a mail-handling machine is provided with a conveyor device having at least one row of drive rollers comprising at least first and second drive rollers standing proud through a mailpiece-receiving deck of the feeder and controlled by a suitable drive mechanism, said first and second drive rollers being inclined at an angle α relative to a perpendicular to a longitudinal referencing wall, and the second drive roller being driven in rotation with a first predetermined delay relative to the first drive roller, which is the closer to the referencing wall.