Driven Roller Diagonal Movement Banknote Transport
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Solution Overview
Problem
In developing countries, paper-sheet processing devices, such as ATMs, face issues with banknote damage due to the brake force caused by the vertical movement of driven rollers, leading to jamming, especially under varying temperature and humidity conditions.
Innovation Solution
A transport device design where the driven roller moves diagonally forward relative to the vertical direction, absorbing the brake force regardless of the banknote's direction of entry, using a bearing groove that allows for flexible movement to reduce damage during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driven roller moves in the vertical direction to press the banknotes against the drive roller, then the transport reliability is improved, but the banknote tip damage increases due to brake force
Solution Approach 1:
The driven roller is made movable in the vertical direction through a bearing groove structure, allowing it to dynamically adjust its position. This enables the roller to absorb impact forces when banknotes are fed, reducing tip damage while maintaining necessary pressure for reliable transport. The roller moves downward to accommodate banknote thickness variations and upward to maintain consistent pressure.
Solution Approach 2:
The bearing groove is designed with a specific inclination angle (5-15 degrees from vertical), introducing a horizontal dimension to the driven roller's movement. This angular orientation allows the roller to simultaneously provide vertical pressing force and horizontal guidance, reducing impact damage while maintaining transport reliability through a combined movement path.
2Object-affected harmful factors
If the driven roller moves in a direction slightly diagonally forward than vertical to reduce brake force, then the banknote tip damage is reduced, but the responsiveness to bi-directional transport deteriorates
Solution Approach 1:
The bearing groove structure provides a universal solution that works for both forward and reverse banknote transport directions. The inclined groove geometry naturally guides the driven roller to move in the appropriate direction regardless of which way the banknotes are fed, making the mechanism adaptable to bi-directional operation while maintaining damage reduction benefits.
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 configuration reduces banknote damage and ensures smooth infeed into the roller contact area, maintaining stability and efficiency in both directional transports.
Implementation Method 1
Banknotes are transported between a drive roller driven by a motor and a driven roller (a pinch roller) that rotates with rotation of the drive roller. The driven roller is brought into pressure contact with the drive roller by a plate spring or a spring. Because a movable direction of the driven roller is vertical to a transport direction of the banknotes, pressure by the driver roller becomes a brake force with respect to the transported banknotes.
Data Source
AI summary
A transport device includes a drive roller and a driven roller. The drive roller transports paper-sheets in a predetermined transport direction by rotation thereof. The driven roller rotates with rotation of the drive roller, and regardless of from which direction the paper-sheets hit a contact point with the first roller, moves in a direction diagonally forward than a vertical direction with respect to the transport direction. The transport device further includes a bearing groove formed so that a shaft of the driven roller moves in a direction diagonally forward than the vertical direction with respect to the transport direction along an inclined surface.