Banknote Alignment Rollers for Centralizing and Deskewing
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Solution Overview
Problem
Media alignment in self-service terminals, such as banknote deposit and recycler modules, is challenging due to varying banknote sizes and potential skewing during transport, which affects efficient and reliable loading into deposit bins or recyclers.
Innovation Solution
A media alignment device with a drive member comprising upper and lower rollers, powered by a stepper motor, and a deskew mechanism with separate motors for each media item drive, allowing precise alignment and deskewing by controlling the rollers' angular positions and speeds to centralize and straighten banknotes before they enter the deposit bin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single drive mechanism is used to transport media items, then the device complexity is reduced, but the ability to accurately align and deskew media items of varying sizes deteriorates
Solution Approach 1:
The drive mechanism is segmented into multiple independent drive rollers (first drive roller, second drive roller, third drive roller, fourth drive roller), each capable of being independently controlled. This segmentation allows differential speed control across different zones of the transport path, enabling both alignment and deskewing functions while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
The system employs dynamic speed control where the rotational speeds of different drive rollers are independently adjustable. The controller dynamically modifies the speed of each roller based on real-time feedback from sensors detecting media item position and orientation, enabling adaptive alignment and deskewing for varying media sizes and skew conditions.
2Productivity
If media items are transported at high speed, then productivity is improved, but the reliability of accurate alignment and deskewing deteriorates
Solution Approach 1:
The system employs periodic adjustment cycles where drive rollers operate at high speed for transport, then periodically slow down or pause to allow sensors to detect media item position and orientation. During these periodic intervals, the controller adjusts roller speeds to achieve alignment and deskewing, then resumes high-speed transport. This periodic action maintains high overall throughput while ensuring reliable alignment at critical moments.
Solution Approach 2:
The system incorporates sensors that continuously monitor media item lateral position and orientation during transport. This feedback is fed to the controller, which dynamically adjusts the speeds of individual drive rollers in real-time, even during high-speed operation. The feedback loop ensures that alignment and deskewing reliability is maintained regardless of transport speed, as the system can make corrective adjustments on-the-fly.
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
Ensures optimal and efficient loading of media items into deposit bins or recyclers by accurately centralizing and deskewing banknotes, enhancing the reliability and throughput of the media handling process.
Implementation Method 1
The driven roller may be powered by a motor, such as a stepper motor. The upper and lower turntables may be driven by a stepper motor. Preferably, the stepper motor is able to rotate the turntables in relatively small angular amounts to provide accurate and fine control of the turntables.
Implementation Method 2
The upper turntable may be coupled to an upper transport guide by bearings mounted on a race, thereby facilitating smooth rotation of the upper turntable relative to the upper transport guide.
Data Source
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AI summary
A media alignment device (12) is described. The device (12) comprises: a media drive turret (20) including a drive member (60,62); and a controller (24). The controller (24) is operable to: receive information about a lateral position of a media item (18) as the media item (18) is transported longitudinally along a transport path, rotate the media drive turret (20) to an angular position required to drive the media item (18) to an aligned position, and activate the drive member (60,62) to move the media item (18) in a direction transverse to the transport path.