Paper Sheet Handling Machine Flat Plate Diverter Jam Prevention
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Solution Overview
Problem
Conventional banknote handling machines often experience jams due to rejected banknotes being excessively curved by nail-like diverters, leading to operational stoppages and increased recovery time.
Innovation Solution
A paper sheet handling machine with a transport unit comprising multiple mechanisms that transport sheets in a horizontal direction, avoiding excessive curvature and the need for gripping, and a control unit that directs rejected sheets to a reject unit without diversion, preventing jams and enhancing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nail-like diverters are used to selectively divert rejected banknotes from the transport path, then rejected banknotes can be removed in an early stage, but the banknotes may be excessively curved causing jams
Solution Approach 1:
Instead of diverting rejected banknotes immediately after recognition (early stage diversion), the invention inverts the approach by allowing banknotes to complete the full transport cycle and only diverting them at the transport unit downstream. This reversal eliminates excessive curvature caused by early nail-like diverters while maintaining rejection functionality.
Solution Approach 2:
The invention introduces a flat plate-shaped diverter as an intermediary element between the recognition unit and stacking units. This diverter serves as a mediator that redirects banknotes without causing the excessive curvature problems of nail-like diverters, as it provides a broader, flatter surface for guidance.
2Loss of time
If diverters are positioned in the middle of the transport path, then rejected banknotes can be diverted early, but the banknotes need to be curved significantly which causes jams
Solution Approach 1:
The invention inverts the diversion timing from early (middle of transport path) to late (downstream at transport unit). This allows banknotes to maintain their flat shape throughout most of the transport path, avoiding excessive curvature while still enabling timely rejection through the downstream diverter position.
Solution Approach 2:
The flat plate-shaped diverter is designed as a simple, robust component that can handle banknotes without causing damage or excessive curvature. Its flat plate design is inherently more forgiving than complex nail-like structures, providing a durable solution that minimizes banknote deformation.
3Ease of operation
If banknotes are diverted by nail-like diverters, then selective rejection is achieved, but excessive curvature causes operational stoppages
Solution Approach 1:
The flat plate-shaped diverter acts as an improved intermediary element that maintains the automatic rejection function while eliminating the excessive curvature problem. Its flat plate geometry provides a gentler guidance surface that redirects banknotes without causing the operational stoppages associated with nail-like diverters.
Solution Approach 2:
The invention changes the geometric parameters of the diverter from a nail-like shape (point contact, high curvature) to a flat plate shape (surface contact, low curvature). This parameter change maintains the diverter's ability to selectively redirect banknotes while significantly reducing the curvature imposed on the banknotes themselves.
Data Source
AI summary
A paper sheet handling machine 1 comprises a casing 92 and at least two stacking units 30, 40 provided in the casing 92. Each stacking unit 30, 40 is configured to stack therein paper sheets respectively taken in the casing 92 by a take-in unit 10. From among the paper sheets transported by a transport unit 20, the paper sheets, each judged to be stored in the stacking unit 30 or 40 by a recognition unit 28, are diverted from the transport unit 20 and fed into the stacking unit 30 or 40, by each diverter 60, 62. A reject unit 50 is connected with the transport unit 20 on the downstream side of the diverters 60, 62. To the reject unit 50, the paper sheets that are not diverted from the transport unit 20 by the respective diverters 60, 62 are fed.