Sheet Conveying Device Acoustic Noise Reduction via Helmholtz Resonance
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Solution Overview
Problem
Existing sheet conveying devices struggle to effectively reduce acoustic noise across a wide range of frequencies without using noise-absorbing materials.
Innovation Solution
A sheet conveying device design featuring a tray, conveying unit, wall member, structural member, and frame, where the wall member has through holes that create inclined surfaces, allowing communication between spaces and utilizing the Helmholtz resonance effect to absorb noise across various frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise absorbing material is used to reduce acoustic noise, then noise reduction effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts the noise reduction function from traditional noise absorbing materials and implements it through the structural geometry of the paper guide itself. The curved surface configuration and through-holes create acoustic effects that reduce noise without requiring separate noise absorbing material components.
Solution Approach 2:
The paper guide structure serves dual functions: guiding sheets and reducing acoustic noise. The curved surface and through-holes are integral parts of the paper guide that automatically provide noise reduction as sheets pass through, eliminating the need for separate noise control components.
2Object-affected harmful factors
If noise absorbing material is disposed along paper guides, then acoustic noise is reduced, but manufacturing complexity increases
Solution Approach 1:
The invention merges the noise reduction function with the paper guide structure by forming curved surfaces and incorporating through-holes directly into the guide. This integration eliminates the need for separate noise absorbing material components and simplifies manufacturing processes.
Solution Approach 2:
The invention changes the geometric parameters of the paper guide (curved surface configuration, through-hole placement and dimensions) to achieve noise reduction. By adjusting these structural parameters, the paper guide itself becomes an acoustic control element without requiring material changes.
3Object-affected harmful factors
If Helmholtz tubes are used with adjustable frequency, then noise absorption at specific frequencies is improved, but device complexity increases
Solution Approach 1:
The invention creates local acoustic control zones within the paper guide structure through strategically placed through-holes and curved surfaces. Each region of the curved surface acts as a localized acoustic element that reduces noise at specific frequencies generated by sheet movement in that area.
Solution Approach 2:
The curved surface configuration and through-holes create mechanical vibration patterns in the air as sheets pass through, generating Helmholtz resonance effects. The geometry of the curved surface and holes determines the vibration frequency, providing passive noise reduction without active control mechanisms.
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 device effectively reduces acoustic noise across a wide range of frequencies without the need for noise-absorbing materials, enhancing noise absorption while maintaining structural integrity and functionality.
Implementation Method 1
utilizing the Helmholtz resonance effect to absorb noise across various frequencies
Data Source
AI summary
A conveying unit conveys a sheet to a tray. A first surface of a wall member and the tray define a first space. A structural member has a facing surface which faces a second surface of the wall member. A wall surface of a frame, the second surface of the wall member, and the facing surface of the structural member define a second space. The wall member has a plurality of through holes including a first through hole and a second through hole. A first imaginary plane containing an edge of the first through hole in the second surface is away from the facing surface of the structural member by a first distance, and a second imaginary plane containing an edge of the second through hole in the second surface is away from the facing surface by a second distance which is different from the first distance.