Non-Magnetic Guide Roller for ATM Bill Validation
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Solution Overview
Problem
Automated teller machines (ATMs) face accuracy issues in sensing the magnetism of bills due to magnetic field changes caused by magnetized guide rollers, leading to noise interference and decreased sensing accuracy.
Innovation Solution
A medium validating apparatus with a magnetic detector that includes a non-magnetic guide roller and a shaft made of non-magnetic material, supported by non-magnetic bearings, to minimize magnetic field changes and improve sensing accuracy, and a conveyance system with tension rollers made of non-magnetic materials to isolate the magnetic detector from potential magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic substance bearings are used in guide rollers, then durability and cost are improved, but magnetic field noise is generated causing decreased sensing accuracy
Solution Approach 1:
The patent extracts the magnetic property from the bearing component by using non-magnetic material (such as resin or ceramic) to replace magnetic substance bearings. This removes the source of magnetic field noise while maintaining the rotational support function, thereby resolving the contradiction between durability and sensing accuracy.
Solution Approach 2:
The patent changes the material parameter of the bearing from magnetic substance to non-magnetic material. This parameter change eliminates the magnetic field generation during rotation, preventing interference with the magnetic sensor's detection of bill magnetism while preserving the mechanical support function.
2Ease of manufacture
If magnetic substance bearings are used in guide rollers, then manufacturing cost is reduced, but magnetic field noise interferes with validation accuracy
Solution Approach 1:
The patent removes the magnetic property from the bearing component, extracting the source of interference while maintaining the structural function. This allows the system to achieve both cost-effectiveness and high validation accuracy by using non-magnetic materials that do not generate magnetic field noise.
Solution Approach 2:
The patent introduces a non-magnetic intermediary material (resin or ceramic bearing) between the guide roller and the magnetic sensor environment. This intermediary component provides mechanical support without generating magnetic field noise, thereby mediating between cost considerations and validation accuracy requirements.
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 reduces magnetic field noise, enhancing the accuracy of magnetism sensing in bills and maintaining the integrity of the magnetic field, thereby improving the overall validation process in ATMs.
Implementation Method 1
the magnetic sensor senses the changing magnetic field as noise
Implementation Method 2
the validator detects the magnetism of the magnetic ink by means of a magnetic sensor
Data Source
AI summary
A bill validator of an automated teller machine includes a magnetic detector for detecting magnetism of bills. The magnetic detector has pressing members of resin material having bearings bored therein. The bearings rotatably hold a shaft for a guide roller which presses bills against the lower surface of a magnetic sensor. The guide roller rotates as bills run on a conveyance path. However, since the bearings consist of fixed parts of resin material and the shaft is formed of non-magnetic material, the rotation does not cause changes in a magnetic field. Thus, when the guide roller rotates, the surrounding magnetic field does not change, so that, although the magnetic detector locates in the vicinity of the guide roller, the magnetic head of the magnetic sensor can well accurately sense the magnetism of bills.