ATM Stripper Assembly With Drag Clutch for Multi-Sheet Separation
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Solution Overview
Problem
Existing ATMs face challenges in efficiently handling and separating multiple sheets of paper during deposit transactions, particularly when they adhere to each other, leading to jamming and operational inefficiencies.
Innovation Solution
A stripper assembly with a feed wheel, stripping tire, and drag clutch mechanism that allows for controlled rotation in both clockwise and counter-clockwise directions, featuring one-way clutches and stripping elements to separate papers effectively, preventing jamming by allowing relative movement between components under varying torque conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sheets of paper are handled during deposit transactions, then the transaction capability is improved, but paper jamming increases due to adhesion between sheets
Solution Approach 1:
The drag clutch is designed to be slip-resistant under normal torque conditions to maintain paper grip, but becomes slip-enabled when excessive torque is detected, allowing the stripping tire to rotate independently and prevent jamming. This dynamic response adapts the system's friction characteristics based on operational conditions.
Solution Approach 2:
The drag clutch acts as an intermediary mechanism between the stripping tire and the drive system. It mediates the torque transmission by allowing controlled slippage when paper adhesion causes excessive resistance, thereby protecting the system from jamming while maintaining normal operational grip.
2Force
If the stripping tire is firmly coupled to the drive shaft, then torque transmission is improved, but the ability to handle adhered papers deteriorates due to lack of flexibility
Solution Approach 1:
The coupling between the stripping tire and drive shaft transitions from rigid to flexible based on torque conditions. Under normal operation, the drag clutch provides firm coupling for effective torque transmission. When paper sheets adhere and create excessive resistance, the clutch allows relative rotation, providing the flexibility needed to handle adverse conditions.
Solution Approach 2:
The system changes the effective friction parameter of the coupling mechanism dynamically. The drag clutch maintains high friction engagement during normal operation for efficient torque transfer, but reduces to a slip-enabled state when torque exceeds the predetermined threshold, allowing the stripping tire to rotate independently and prevent system stalling.
3Device complexity
If a simple rotation mechanism is used, then device complexity is reduced, but the ability to control paper separation under varying conditions deteriorates
Solution Approach 1:
The drag clutch serves as an intermediary device that automatically responds to torque variations without requiring complex external control systems. It passively regulates the power transmission between the drive shaft and stripping tire, enabling adaptive paper separation control through its inherent slip-resistant and slip-enabled characteristics.
Solution Approach 2:
The drag clutch autonomously regulates torque transmission based on the load conditions imposed by paper adhesion. It self-adjusts between grip and slippage states without external intervention, allowing the system to maintain effective paper separation control while keeping the overall mechanism relatively simple.
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
The stripper assembly ensures smooth handling and separation of papers, reducing jamming and enhancing the operational efficiency of ATMs during deposit transactions.
Implementation Method 1
The drag clutch can be configured such that the radially-outer portion and the radially-inner portion are fixed together up to a predetermined level of torque and further configured such that the radially-outer portion and the radially-inner portion are rotationally moveable relative to one another in response to torque greater that the predetermined level of torque
Data Source
AI summary
A stripper assembly can include a feed wheel, a stripping tire, a drag clutch, and first and second stripping elements. The feed wheel and stripping tire can be mounted for rotation in clockwise (CW) and counter-clockwise (CCW) directions and can contact one another to define a nip through which papers are directed. The drag clutch can be interposed between the stripping tire and the shaft it is mounted upon. The first and second stripping elements can be positioned on the shaft of the stripping tire on opposite sides of the nip. Each of the stripping elements can be configured and positioned to engage papers passing through the nip. The drag clutch is not interposed between either of the first and second stripping elements and the shaft of the stripping tire.