ATM Inlet Roller Layout to Prevent Paper Skew Restoration
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Solution Overview
Problem
Conventional automated teller machines (ATMs) suffer from the restoration of skew in paper mediums when transferred from a drum to an inlet roller, undoing the skew correction previously applied by an intermediate roller.
Innovation Solution
The ATM design includes an inlet roller with a larger diameter and specific spacing of roller parts to maintain the skew correction when paper mediums are transferred from an intermediate roller to the inlet roller, ensuring stable contact and minimizing skew restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inlet roller transfers paper mediums at a speed matching the conveyance path, then the transfer efficiency is improved, but the skew correction applied by the intermediate roller is restored (worsened)
Solution Approach 1:
The inlet roller is designed with a variable speed capability, allowing it to dynamically adjust its rotation speed between two modes: a first speed when receiving paper mediums from the intermediate roller to maintain skew correction, and a second speed when transferring to the conveyance path to ensure transfer efficiency. This dynamic speed adjustment resolves the contradiction between maintaining precision and ensuring productivity.
Solution Approach 2:
The inlet roller operates in periodic cycles, alternating between receiving paper mediums at the first speed (when skew correction is priority) and transferring at the second speed (when conveyance efficiency is priority). This periodic switching of operational modes allows the system to achieve both skew correction and transfer efficiency at different stages of the transfer process.
2Manufacturing precision
If the inlet roller has a larger diameter, then the skew correction is maintained better, but the roller size and device complexity increase
Solution Approach 1:
The inlet roller is segmented into multiple independent rollers arranged in parallel, rather than using a single large-diameter roller. Each segment can independently contact the paper medium, and collectively they provide the necessary skew correction effect. This segmentation achieves the precision goal without requiring an excessively large single roller, thereby reducing device complexity.
Solution Approach 2:
Multiple smaller roller segments are nested or arranged within the spatial envelope that a single large roller would occupy. This nested arrangement of multiple functional elements achieves the cumulative effect of a large-diameter roller while using smaller, more manageable components that reduce overall structural complexity.
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 solution effectively maintains the skew correction of paper mediums, preventing the skew from returning to its original state during transfer from the intermediate to the inlet roller, enhancing the storage efficiency of paper mediums on the drum.
Implementation Method 1
The intermediate roller blocks the transfer of a portion of the paper medium that arrives earlier than the other portion, causing the paper medium to rotate in the opposite direction of the tilt.
Implementation Method 2
the inlet roller transfers the portion of the paper medium that arrives earlier than the other portion at a faster speed, the paper medium rotates in the tilted direction, causing its skew angle to increase back to the pre-correction skew angle
Data Source
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AI summary
An automated teller machine includes: a conveyance path; a medium storage cassette for receiving and storing paper mediums conveyed through the conveyance path, or discharging the paper mediums to the conveyance path; and an inlet roller. The medium storage cassette includes: a drum; and an intermediate roller for transferring the paper mediums between the drum and the inlet roller. The inlet roller transfers the paper mediums between the intermediate roller and the conveyance path. The inlet roller includes: an inlet transfer rotation shaft; and inlet transfer roller parts having a diameter larger than that of the inlet transfer rotation shaft so that at least a portion of their outer circumference comes in contact with the paper mediums, the inlet transfer roller parts being arranged on the inlet transfer rotation shaft to be spaced apart from each other in a width direction perpendicular to a transfer direction of the paper mediums.