Paper Thickness Detection Roller Pitching Suppression
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Solution Overview
Problem
Conventional paper-sheet-thickness detecting devices in banknote recognition units face challenges such as complex configuration, difficulty in setting the detection roller gap, inaccurate thickness detection due to tremors and dust adherence, and paper jam issues.
Innovation Solution
A paper-sheet-thickness detecting device with a simplified configuration, featuring a reference roller, detection units with a detection roller, a first pressing member, and a displacement detector, along with a pitching suppression unit and a scraper for foreign substance removal, arranged to reduce kick in output waveforms and maintain accurate detection without restricting roller movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection roller is always brought into contact with the reference roller, then the thickness detection function is maintained, but a tremor (pitching) of the detection roller occurs during passage of a paper sheet, causing inaccurate thickness detection
Solution Approach 1:
The detection roller is designed to be movable rather than fixed, allowing it to dynamically adjust its position. A pressing member applies a pressing force to maintain contact between the detection roller and reference roller, but the detection roller can move when paper passes through, eliminating tremor while maintaining detection function
Solution Approach 2:
The pressing force is applied at a position separated from the detection roller contact point, allowing independent control of the pressing function and detection function. This segmentation enables the pressing member to maintain contact without causing tremor at the detection interface
2Object-affected harmful factors
If a scraper is secured to a part of the apparatus to remove foreign substances, then foreign substance removal is achieved, but movement of the detection roller when a banknote comes in between the rollers is blocked due to an end of the scraper
Solution Approach 1:
The scraper is made of elastic material that can flex and deform. When the detection roller moves during paper passage, the elastic scraper bends to accommodate the movement rather than blocking it, while still maintaining its foreign substance removal function when the rollers are stationary
Solution Approach 2:
The scraper transitions from a static blocking element to a dynamic flexible element that adapts its shape based on the operational state, allowing roller movement during detection while maintaining cleaning function during idle periods
3Measurement precision
If the detection roller is made movable to eliminate tremor, then thickness detection accuracy is improved, but the configuration becomes more complex
Solution Approach 1:
The pressing function and detection function are merged into a single integrated mechanism. The pressing member that applies force to maintain contact also serves as part of the detection system, eliminating the need for separate pressing and detection components
Solution Approach 2:
The detection block serves multiple functions: it applies pressing force through the pressing member, supports the movable detection roller, and enables thickness detection. This multi-functionality reduces the overall number of components and simplifies the configuration
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
Enables accurate thickness detection and taped part detection without fine adjustment, reduces kick in output waveforms, and effectively removes foreign substances, simplifying the configuration and improving detection accuracy.
Implementation Method 1
a displacement detector that detects displacement of the detection roller in a noncontact manner
Implementation Method 2
The detection roller is pushed down by this bias
Data Source
AI summary
A paper-sheet-thickness detecting device includes a reference roller provided on a fixed rotation shaft; a detection roller provided to face and come into contact with the reference roller; a detection block in which the detection roller is provided at one end and the other end is rotatably fixed around a fulcrum shaft so that the detection block is turned and displaced according to a thickness of a paper sheet passing through between the reference and detection rollers; a holding block that holds the fulcrum shaft; a first pressing member fixed to the holding block to maintain contact between the detection and reference rollers by pressing the detection block, the first pressing member being displaced according to rotation and displacement of the detection block when the paper sheet passes through between the reference and detection rollers; and a displacement detector that detects a displacement amount of the first pressing member.