Media Pick System Tailgate Mechanism for Throughput
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Solution Overview
Problem
Automatic document feeding systems often produce a large gap between sheets, leading to lower throughput due to the discrete picking mechanism, which results in reduced operational speed.
Innovation Solution
The implementation of a tailgate picking mechanism using a split retard pad and a narrower separation roller, with a pick roller trough providing clearance to prevent torque spikes and noise, and reducing the normal force of the pick roller to minimize multi-picking, while maintaining the hierarchy of frictional forces between the pick roller, retard pad, and media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discrete picking mechanism is used to pick sheets one at a time, then multi-picking is prevented, but the gap between sheets increases and throughput decreases
Solution Approach 1:
The system performs preliminary separation of sheets before the picking action by using a separation pad and separation roller to create frictional engagement that lifts the top sheet slightly, ensuring it is ready for picking without requiring excessive picking force that could cause multi-picking
Solution Approach 2:
The system dynamically adjusts the picking force parameter by using a spring-loaded pick roller that applies controlled normal force, and modifies the friction hierarchy by selecting specific materials for the pick roller, separation roller, and separation pad to ensure proper sheet separation while maintaining reliable single-sheet picking
2Reliability
If the pick roller normal force is increased to ensure reliable picking, then picking reliability improves, but multi-picking and torque spikes increase
Solution Approach 1:
The system optimizes the normal force parameter by using a spring-loaded pick roller mechanism that applies just enough force to engage the top sheet through friction without excessive force that would cause multi-picking. The friction hierarchy between pick roller, separation roller, and separation pad materials is carefully selected to achieve reliable picking at lower normal forces
Solution Approach 2:
The separation pad and separation roller perform preliminary engagement with the top sheet before picking occurs, creating a frictional connection that reduces the normal force required from the pick roller. This preliminary action ensures the top sheet is securely engaged without requiring high picking forces that would cause multi-picking or torque spikes
3Reliability
If a wide separation pad is used to prevent multi-picking, then separation reliability improves, but contact with the pick roller causes torque spikes and noise
Solution Approach 1:
The separation pad is designed with non-uniform material properties or surface characteristics in different zones. The portion that contacts the pick roller has different friction characteristics than the portion that contacts the separation roller, allowing the system to prevent multi-picking at the separation roller interface while minimizing harmful contact at the pick roller interface
Solution Approach 2:
The system carefully selects and varies the friction parameters across different components: the pick roller material, separation roller material, and separation pad material are chosen to create an optimal friction hierarchy. This allows the wide separation pad to provide reliable separation without creating excessive friction or torque spikes during pick roller contact
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
This design significantly reduces the gap between subsequent sheets, increasing throughput by more than 67% while minimizing noise and cost, and preventing multi-picking and torque spikes.
Implementation Method 1
The pick roller is lowered from a raised position to contact the top sheet of a stack of sheets of media and advance the sheet along a paper path
Implementation Method 2
maintaining the hierarchy of frictional forces between the pick roller, retard pad, and media
Data Source
AI summary
A media pick system includes a media support, a pick roller, disposed above media support, configured to selectively contact and pick sheets of media disposed upon the media support, and clearance means, associated with the media support, for providing contact-free clearance around the pick roller during a media out condition.