Sheet Conveying Device Noise Absorption via Helmholtz Resonator
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Solution Overview
Problem
Image forming apparatuses experience undesired slide noise due to sheets sliding over components within the sheet conveying device, which degrades the environmental noise quality.
Innovation Solution
A sheet conveying device is designed with a primary sheet guide and a secondary sheet guide, where the secondary guide includes a bending portion to change the sheet conveyance direction, and a communication through-hole is positioned opposite the bending portion to absorb the slide noise by converting it into thermal energy through Helmholtz resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sheet conveying device is used to convey sheets, then sheet conveyance function is achieved, but slide noise is generated when sheets slide over components
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the slide noise generated during sheet conveyance as a triggering mechanism for the resonator. The noise that was previously considered harmful is now converted into the activating signal for the noise absorption mechanism, allowing the system to address the noise problem using the noise itself as the trigger.
Solution Approach 2:
The resonator acts as an intermediary element between the sheet conveyance system and the external environment. It mediates the noise problem by absorbing the slide noise through resonant oscillation of air molecules within the resonator cavity, converting acoustic energy into thermal energy through viscous dissipation, thereby reducing the harmful noise without interfering with the sheet conveyance function.
2Ease of operation
If conventional sheet guiding components are used, then sheet guidance is achieved, but noise absorption is insufficient
Solution Approach 1:
The resonator is designed to perform multiple functions: it serves as both a noise absorption mechanism and a component that can be integrated into the sheet guiding structure. By combining the noise absorption function with the existing sheet guidance components, the patent achieves multi-functionality without adding separate complex noise control systems.
Solution Approach 2:
The patent employs parameter changes by adjusting the physical dimensions and configuration of the resonator cavity to optimize noise absorption at specific frequencies. The resonator's geometry is designed to match the frequency characteristics of the slide noise, creating resonant oscillation that maximizes noise absorption efficiency while maintaining sheet guidance functionality.
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 effectively reduces slide noise by positioning the through-hole to directly absorb noise generated at the bending portion, enhancing sound absorption and minimizing noise diffusion, thereby improving the environmental noise quality.
Implementation Method 1
a communication through-hole communicating with the cavity and the sheet conveyance path. The communication through-hole is disposed opposite the bending portion in a direction perpendicular to the sheet conveyance direction
Data Source
AI summary
A sheet conveying device includes a conveyer to convey a sheet and a primary sheet guide, disposed downstream from the conveyer in a sheet conveyance direction, to guide the sheet conveyed by the conveyer in the sheet conveyance direction. A secondary sheet guide is disposed opposite the primary sheet guide and includes a bending portion to bend the sheet while the sheet slides over the bending portion to change the sheet conveyance direction. A sheet conveyance path is defined by the primary sheet guide and the secondary sheet guide. The primary sheet guide includes a cavity disposed opposite the sheet conveyance path and a communication through-hole communicating with the cavity and the sheet conveyance path. The communication through-hole is disposed opposite the bending portion in a direction perpendicular to the sheet conveyance direction.