Media Ejection Controller for Windowed Currency Detection
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Solution Overview
Problem
Existing media handling devices face challenges in accurately detecting and processing windowed currency notes due to false readings from optical sensors, which are triggered by transparent windowed portions, leading to difficulties in determining the presence and orientation of media, resulting in incorrect ejection and handling issues.
Innovation Solution
A method for selectively disabling and enabling media edge detection during ejection processing, using a combination of sensors to determine the status of media presence and orientation, and adjusting the transport path accordingly to ensure accurate ejection of both windowed and non-windowed media, regardless of their orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical sensors are used to detect media presence, then media tracking and verification are enabled, but false readings occur when windowed (transparent) portions of media pass over the sensors
Solution Approach 1:
The system dynamically adjusts the media ejection process based on sensor feedback. When a windowed portion passes over the optical sensor, the system detects the false unblocked condition and responds by retracting the media back into the infeed module, then re-presenting it for ejection. This dynamic adjustment allows the system to handle both windowed and non-windowed media reliably.
Solution Approach 2:
The system uses feedback from optical sensors to monitor media presence during ejection. When the sensor reports an unblocked condition during ejection (indicating either media removal or a windowed portion), the system responds by checking sensor status again and deciding whether to retract and re-present the media. This feedback mechanism enables the system to distinguish between genuine media absence and false readings from windowed portions.
2Measurement precision
If media edge detection is continuously enabled during ejection processing, then media presence is tracked, but false unblocked conditions from windowed portions cause incorrect determination of media exit status
Solution Approach 1:
Instead of continuously relying on edge detection during the entire ejection process, the system uses periodic checking of sensor status at specific moments: when the shutter opens, when media is presented, and when determining if media has been removed. This periodic verification approach prevents false conclusions from windowed portions while maintaining accurate tracking of media presence.
Solution Approach 2:
The system performs preliminary actions to prepare for potential false readings: it positions the media for ejection, opens the shutter, and presents the media before relying on sensor feedback. If a false unblocked condition is detected, the system has already prepared the media for retraction and re-presentation, ensuring accurate status determination despite windowed portions.
3Speed
If the transport path is halted immediately when sensor status changes, then responsive control is achieved, but false status changes from windowed portions cause premature halting and incorrect ejection decisions
Solution Approach 1:
The system prepares for potential false sensor readings by having pre-programmed response protocols ready. When an unblocked condition is detected during ejection, the system doesn't immediately halt but instead follows a predetermined sequence: check sensor status again, determine if media should be retracted, and then execute the appropriate action. This cushioning approach prevents premature halting while maintaining responsive control.
Solution Approach 2:
The system uses feedback loops to verify sensor status before making ejection decisions. When the sensor reports an unblocked condition, the system checks the sensor status again and evaluates the overall context (shutter position, media presentation state) before determining whether to halt and retract the media. This feedback mechanism ensures that halting decisions are based on accurate information rather than false readings from windowed portions.
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 approach allows for consistent and accurate ejection of both windowed and non-windowed media, preventing false indications of media absence and ensuring proper handling, even with larger windowed currency notes, thereby enhancing user experience and reducing maintenance complexity without requiring new hardware.
Implementation Method 1
optical (track) sensors situated throughout the devices for purposes of tracking the media and/or verifying the authenticity of the media
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
An infeed module (101) of a valuable media depository is configured to track media edge detection during ejection processing. When sensors of the infeed module report conditions that would otherwise indicate that media has exited or been retracted back into the infeed module during ejection processing, reporting of the conditions are delayed or modified based on a tracked edge detection status. Thereby permitting the infeed module to perform proper ejection processing on both windowed and non-windowed media regardless of the dimensions present for any windowed portions of the media.