High Capacity Feeder Tray Rotation for Uneven Media Stacks
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Solution Overview
Problem
Existing machines that process stacked objects face challenges with unevenly fed media, leading to misfeeds and limited capacity due to uneven stacks, particularly with documents having non-uniform thicknesses like DocuCards, where the stack becomes lopsided and requires frequent reloading.
Innovation Solution
The method involves rotating non-flat pages 180° every 100-250 pages to distribute uneven thickness, using a camera or sensor to detect orientation and adjust accordingly, ensuring a flat stack and maximizing feeder capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If media with non-uniform thickness (e.g., DocuCards, envelopes) is stacked in high capacity feeders, then the feeder capacity is increased, but the stack becomes lopsided and pages mis-feed at the initial point of take up
Solution Approach 1:
The patent applies the dynamics principle by making the bottom supporting surface of the stack pivotable rather than fixed. The support surface can dynamically adjust its angle in response to the uneven weight distribution caused by non-uniform media thickness. This dynamic adjustment allows the system to accommodate variable stack conditions while maintaining proper feeding geometry, thereby enabling high capacity feeding without misfeeds.
Solution Approach 2:
The patent implements the anti-weight principle by using springs to counterbalance the uneven downward force created by thicker portions of the media stack. The springs provide an upward counteracting force that compensates for the weight imbalance caused by non-uniform media (such as DocuCards or envelopes), allowing the stack to remain stable and properly aligned during the feeding process.
2Shape
If spring mounted support is used to counterbalance thicker marginal region, then the stack levelness is improved, but the bottom-most sheets are still significantly bent and the stacking height capacity is limited
Solution Approach 1:
The patent applies segmentation by dividing the stack support into multiple independent pivotable sections rather than using a single rigid support structure. This allows different portions of the stack to be supported at optimally adjusted angles, reducing bending of individual sheets while maintaining overall stack levelness. The segmented approach distributes the support function across multiple adjustable points.
Solution Approach 2:
The patent transitions from a two-dimensional fixed support plane to a three-dimensional pivotable support surface that can rotate to accommodate the uneven weight distribution. By adding the rotational degree of freedom, the system can compensate for thickness variations without requiring complex multi-layer support structures, thereby reducing overall device complexity while maintaining stack levelness.
3Shape
If only one portion of the stack support tilts while the other portion remains fixed, then the leading and trailing marginal regions can be leveled, but the bottom-most sheets are still variably significantly bent
Solution Approach 1:
The patent makes the entire bottom supporting surface pivotable rather than having only one fixed and one movable portion. This dynamic support surface can adjust its angle to match the uneven weight distribution across the entire stack, allowing all sheets including the bottom-most ones to remain substantially planar. The full-surface pivotability ensures uniform support across all sheets while accommodating thickness variations.
Data Source
AI summary
A method for feeding uneven media from a high capacity feeder includes rotating the pages in a stack 180° every 100-250 pages. This is only done with non-flat pages, such as, envelopes, pages with labels thereon, etc., which create tilted stacks and limit the number of pages that can be placed in the high capacity feeder. Rotating the pages 180° distributes the uneven build-up of the pages and creates a relatively flat stack, allowing the high capacity feeder to be filled to capacity. A camera or sensor placed in the high capacity feeder will detect the orientation of the stack on the fly so the image can be rotated accordingly.