Adjustable Helmholtz Resonator for Sheet Conveyance Noise
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Solution Overview
Problem
Existing sheet conveying devices face challenges in effectively absorbing sliding sounds across varying sheet properties, as the sound absorber's efficiency is compromised when the sound source position changes due to differences in sheet thickness and weight, leading to inadequate noise reduction.
Innovation Solution
A sheet conveying device with a sound absorber featuring a Helmholtz resonator structure, where the communication opening's position is adjustable within the conveying passage to align with the changing sound source, ensuring optimal sound absorption regardless of sheet type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sound absorber uses a fixed communication portion position, then the structure is simple and easy to manufacture, but the sound absorption efficiency decreases when sheet properties change causing sound source position changes
Solution Approach 1:
The communication portion is designed to be movable along the sheet conveying passage rather than fixed, allowing it to dynamically adjust its position to track the changing sound source position caused by varying sheet properties such as thickness and weight
Solution Approach 2:
The position parameter of the communication portion is made changeable to adapt to different sheet types, enabling the sound absorber to maintain optimal efficiency across varying operating conditions without requiring multiple fixed absorbers
2Reliability
If the communication portion is disposed closer to the sound source to increase sound absorbing efficiency, then sound absorption improves, but the device cannot adapt when sound source position changes due to varying sheet properties
Solution Approach 1:
The communication portion is designed to be movable along the sheet conveying passage rather than fixed, allowing it to dynamically adjust its position to track the changing sound source position caused by varying sheet properties such as thickness and weight
Solution Approach 2:
The sound absorber automatically tracks the sound source position through the movable communication portion without requiring external intervention or manual adjustment, enabling self-adaptation to changing sheet types and properties
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 adjustable communication opening effectively absorbs sliding sounds, maintaining high sound absorption performance even when the sound source position changes, thereby reducing noise leakage outside the device.
Implementation Method 1
a sound absorber having a configuration of a Helmholtz resonator including a hollow portion and a communication portion to cause the hollow portion to communicate with an outside of the sheet conveying device
Implementation Method 2
Sliding sound is generated when a conveyance passage forming device such as a guide member to form a sheet conveying passage and a sheet that is being conveyed through the sheet conveying passage
Data Source
AI summary
A sheet conveying device, which is included in an image reading device and an image forming apparatus, includes a passage forming body and a sound absorber. The passage forming body is configured to define a sheet conveying passage through which a sheet passes. The sound absorber includes a hollow portion and a communication portion configured to communication the hollow portion and the sheet conveying passage. A position of the communication portion of the sound absorber is changeable in the sheet conveying passage. The sheet conveying device included in the image reading device includes an original document conveying device configured to convey an original document having an image on a surface. The sheet conveying device included in the image forming apparatus includes a recording medium conveying device configured to convey the recording medium accommodated in a recording medium container to the image forming device.