Sheet Conveyance Roller Support Reducing Squeak Noise
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Solution Overview
Problem
Existing sheet conveyance devices face challenges in reducing squeak noises and ensuring smooth operation, particularly in curved portions of the conveyance path where large loads are applied.
Innovation Solution
The proposed sheet conveyance device incorporates a support portion with a groove, hook, biasing member, and lever to securely support the driven roller, reducing oscillation and noise by biasing the rotary shaft against the hook using a coiled spring and lever mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotary shaft is directly supported without a lever mechanism, then the structure is simpler, but squeak noises increase and operation smoothness deteriorates under large loads
Solution Approach 1:
The lever member acts as an intermediary between the biasing member and the rotary shaft. It transmits the biasing force while providing a buffer that reduces direct contact noise, thereby improving operation smoothness without significantly complicating the overall structure
Solution Approach 2:
The support structure is segmented into distinct functional components: the groove for positioning, the hook for engagement, the biasing member for applying force, and the lever member for force transmission. This segmentation allows each component to perform its specific function efficiently, reducing noise while maintaining structural clarity
2Object-affected harmful factors
If a biasing member is added to press the rotary shaft against the hook, then noise reduction improves, but the device complexity increases
Solution Approach 1:
The biasing member converts the potential harm of loose, noisy contact into beneficial continuous pressure. By maintaining constant contact between the rotary shaft and hook through elastic or spring force, the system eliminates squeak noises while the simplicity of using a common elastic or spring component minimizes the added complexity
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
This solution effectively reduces squeak noises and ensures smooth rotation of the driven roller, even under large loads, by stabilizing the rotary shaft and minimizing contact-induced noise.
Implementation Method 1
The lever is disposed between the biasing member and the rotary shaft and elastically deformable
Implementation Method 2
The biasing member biases the rotary shaft toward the hook
Data Source
AI summary
A sheet conveyance device includes a conveyance roller pair and a support portion that supports a driven roller of the conveyance roller pair. The driven roller includes a rotary shaft and a roller body supported rotatably by the rotary shaft. The support portion includes: a groove that is formed along a crosswise direction crossing an axial direction of the rotary shaft and receives the rotary shaft along the crosswise direction; a hook which is provided to project inwardly with respect to the groove and against which the rotary shaft is pressed; a biasing member that biases the rotary shaft toward the hook; and an elastically deformable lever disposed between the biasing member and the rotary shaft.