Sheet Feeder Distance Detection with Retractable V-Shaped Surfaces
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Solution Overview
Problem
Existing methods for detecting the presence and distance of objects in large-capacity sheet feeding apparatuses face challenges due to restricted apparatus size and variations in light reflection, leading to inaccurate detection and potential damage to components like end fences.
Innovation Solution
A distance detector system with a distance-measuring sensor and retractable detection surfaces, including a plane surface and a V-shaped surface, enhances detection accuracy by maximizing diffuse reflection, allowing reliable detection of end fence positions and sheet sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a distance-measuring sensor is used to detect the presence and distance of objects in large-capacity sheet feeding apparatuses, then detection capability is improved, but detection accuracy deteriorates due to variations in light reflection
Solution Approach 1:
The end fence is designed with different surface properties at different locations: the front surface facing the distance-measuring sensor has high reflectance to ensure reliable detection, while the rear surface has low reflectance to prevent false detection when the fence is retracted. This local differentiation of surface quality resolves the contradiction between detection capability and accuracy.
Solution Approach 2:
The front surface of the end fence acts as an intermediary element between the distance-measuring sensor and the actual sheet material. By optimizing its reflectance properties, it mediates the detection process to ensure accurate measurement while preventing interference from other surfaces.
2Adaptability or versatility
If the end fence is made retractable to accommodate different sheet sizes, then adaptability is improved, but reliability deteriorates due to potential damage from incorrect positioning
Solution Approach 1:
The system performs preliminary detection of the end fence position using the distance-measuring sensor before the lift table raises the sheets. This advance detection allows the control unit to verify correct positioning and prevent operation that could cause damage, thereby maintaining reliability while preserving adaptability.
Solution Approach 2:
The distance-measuring sensor provides continuous feedback about the end fence position to the control unit. This feedback mechanism enables real-time monitoring and control, ensuring the end fence is correctly positioned before sheet handling operations, thus preventing damage while maintaining retractability for different sheet sizes.
3Measurement precision
If multiple detection surfaces are used to maximize diffuse reflection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection function is merged into the existing end fence structure itself. The front and rear surfaces of the end fence serve as the detection surfaces, eliminating the need for separate detection components. This integration improves measurement precision through diffuse reflection while avoiding additional device complexity.
Solution Approach 2:
The end fence serves multiple functions: it acts as both a sheet positioning element and a detection target for the distance-measuring sensor. The same structural component provides both mechanical function and optical detection interface, reducing overall system complexity while enhancing detection precision.
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 system ensures accurate detection of end fence settings and sheet sizes, preventing damage and simplifying the sheet feeder configuration while maintaining cost-effectiveness.
Implementation Method 1
it is preferable that an object to be detected not be disposed to face a light emitter or laser diode (LD) of the distance-measuring sensor such that the distance-measuring sensor detects that there is no object to be detected
Implementation Method 2
A distance detector system with a distance-measuring sensor and retractable detection surfaces, including a plane surface and a V-shaped surface, enhances detection accuracy by maximizing diffuse reflection
Data Source
AI summary
A distance detector includes a distance-measuring sensor, a first detection surface, a second detection surface, and processing circuitry. The first detection surface is perpendicular to an optical axis of the distance-measuring sensor. The second detection surface is behind or in front of the first detection surface with respect to the distance-measuring sensor. The second detection surface has two faces inclined with respect to the optical axis of the distance-measuring sensor. The first detection surface or the second detection surface is retractable from the distance-measuring sensor. The processing circuitry determines whether the first detection surface or the second detection surface is detected by the distance-measuring sensor and causes the distance detector to detect a distance from the distance-measuring sensor to the first detection surface based on detection of the first detection surface by the distance-measuring sensor.