Sheet Discriminating Device with Movable Guides
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Solution Overview
Problem
Conventional sheet conveying systems face issues with reduced conveyance speed due to frictional resistance and unstable light transmissivity, leading to potential conveyance failures and image acquisition issues in sheet discrimination processes.
Innovation Solution
A sheet discriminating device with a first and second conveying structure, arranged at a predetermined distance, and an image detecting mechanism that sets specific entry angles and distances to maintain the sheet's position, ensuring continuous detection without blocking the detection range and minimizing frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixed guide is used to convey the sheet, then the sheet can be guided stably, but frictional resistance increases and conveyance speed reduces
Solution Approach 1:
The patent replaces fixed guides with movable guides that can dynamically adjust their position. The movable guides reduce frictional resistance by allowing relative motion between the guide and sheet, thereby maintaining sheet guidance stability while enabling higher conveyance speeds.
Solution Approach 2:
The patent changes the physical state of the guide from fixed to movable, altering the friction characteristics. This parameter change reduces the frictional resistance between the guide and sheet, allowing the sheet to be conveyed at higher speeds without losing guidance stability.
2Measurement precision
If a light-transmittable fixed guide is used, then optical detection can be performed, but light transmissivity decreases due to dust adhesion
Solution Approach 1:
The patent replaces fixed guides with movable guides in the optical detection path. The movable guides can be periodically cleaned or replaced, preventing dust accumulation from permanently degrading light transmissivity. This maintains reliable optical image acquisition over extended operation periods.
Solution Approach 2:
The patent introduces a movable guide as an intermediary between the light source and the sheet. This intermediary can be easily maintained or replaced, ensuring that dust adhesion does not permanently affect light transmissivity and optical detection reliability.
3Speed
If the sheet is conveyed in an unconstrained state, then frictional resistance is reduced, but the sheet position becomes unstable for optical detection
Solution Approach 1:
The patent uses movable guides that dynamically constrain the sheet position during optical detection while allowing free movement during non-detection periods. This dynamic constraint system maintains both high conveyance speed and optical detection accuracy by adjusting guidance intensity based on operational 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 enables stable conveyance and accurate optical information detection of sheets, preventing conveyance failures and ensuring reliable processing by maintaining the sheet's position and reducing frictional resistance.
Implementation Method 1
acquiring an optical image of the sheet using an optical sensor
Data Source
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AI summary
According to one embodiment, a sheet discriminating device includes a first conveying structure (11) and a second conveying structure (12) that are arranged at a predetermined distance from each other in a conveying direction of a sheet (P) and that are configured to convey the sheet (P), and an information detecting means (13) that is provided between the first conveying structure (11) and the second conveying structure (12) such that a detection range thereof is not blocked, and that is configured to detect information from the sheet (P), wherein a first entry angle θ1 that is formed by a first entry direction (D1) in which the sheet (P) enters a space between the first conveying structure (11) and the second conveying structure (12) from the first conveying structure (11) and a conveyance reference plane (A) that is set between the first conveying structure (11) and the second conveying structure (12), and a second entry angle θ2 that is formed by a second entry direction (D2) in which the sheet (P) enters the second conveying structure (12) from the space between the first conveying structure (11) and the second conveying structure (12) and the conveyance reference plane (A) are set to be equal to or less than respective predetermined values that depend on positions of the first conveying structure (11), the second conveying structure (12), and the information detecting means (13) and a distance up to which the sheet (P) is allowed to be separated from the conveyance reference plane (A) at the position of the information detecting means (13).