Paper Sheet Stacking Apparatus Skew Correction via Belt Segmentation
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Solution Overview
Problem
Existing paper sheet stacking apparatuses in banknote sorting machines face issues with skewed paper sheets entering impellers, leading to stack failures and buckling due to strong binding forces and high-speed impacts.
Innovation Solution
A paper sheet stacking apparatus with a conveying device comprising a first pair of belts and second pairs of belts positioned on both sides, where the take-out ends of the second belts are upstream, allowing the paper sheet to be conveyed by only one belt after release, enabling correction of skew and buffering impact at impellers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If three belts (upper belt 101a and upper belts 102a, 102a) are used to convey the paper sheet P, then the binding force on the paper sheet is strong, but the paper sheet cannot be released properly and skew correction is prevented
Solution Approach 1:
The conveying system is segmented into two stages: first, three belts (101a, 102a, 102a) provide strong binding force for stable conveyance; second, the second belts (102a, 102a) are stopped while the first belt (101a) continues moving, releasing the paper sheet for skew correction and proper entry into impeller vanes. This segmentation allows the system to switch between strong binding and easy release states.
2Productivity
If the conveying speed is increased to increase processing capacity, then productivity improves, but the impact on vanes 103 becomes large causing buckling
Solution Approach 1:
The system performs preliminary skew correction by stopping the second belts (102a, 102a) while the first belt (101a) continues to move the paper sheet. This preliminary action ensures the paper sheet is properly aligned before entering the impeller, preventing buckling even at high conveying speeds that increase processing capacity.
3Device complexity
If the paper sheet is conveyed in a skewed state, then conveyance is simple, but the paper sheet enters different phase vanes causing stack failure
Solution Approach 1:
The conveying system dynamically adjusts the operation of different belts based on the paper sheet's state. The second belts (102a, 102a) are stopped while the first belt (101a) continues moving, creating a dynamic release mechanism that corrects skew and ensures the paper sheet enters the same-phase vanes of the impeller, maintaining stacking accuracy without overly complicating the conveyance mechanism.
Data Source
AI summary
A paper sheet stacking apparatus comprises a conveying device which has first and second conveying members, wherein take-out ends of the second conveying members are positioned on a more upstream side in a paper sheet conveying direction than a take-out end of the first conveying member, and after a paper sheet is taken out from the second conveying members, the paper sheet is conveyed by only the first conveying member, an impeller which introduces the paper sheet conveyed by only the first conveying member into between vanes thereof to guide the paper sheet in a predetermined direction, and then discharges the paper sheet, and a stack housing which stacks the paper sheets discharged from the impeller.