Rotary Body Protrusion for Image Reading Stability
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Solution Overview
Problem
In image reading devices, a large gap between the rotary body and the image reading section leads to unstable behavior of the recording medium, resulting in decreased image reading quality.
Innovation Solution
An image reading device is designed with a protruding portion on the rotary body at one or both ends, which protrudes towards the image reading section, guiding the recording medium and stabilizing its passage to improve reading quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a large gap is provided between the rotary body and the image reading section, then the structure is simpler and easier to manufacture, but the behavior of the recording medium becomes unstable and image reading quality decreases
Solution Approach 1:
The rotary body is segmented by adding a protruding portion that extends toward the image reading section, creating a distinct guiding element separate from the main rotary body structure. This segmentation allows the protruding portion to specifically address the recording medium guidance function while the rest of the rotary body maintains its simpler structure, resolving the contradiction between ease of manufacture and image reading quality.
Solution Approach 2:
The protruding portion acts as an intermediary element between the rotary body and the recording medium. It provides a physical guide that stabilizes the recording medium's passage through the gap, mediating the interaction between the rotary body and recording medium to improve stability and image reading quality without requiring a complete structural redesign.
2Reliability
If a protruding portion is added to the rotary body to guide the recording medium, then the stability of recording medium passage is improved, but the device complexity increases
Solution Approach 1:
Instead of making the entire rotary body complex, the protruding portion is added only at the specific location where guidance is needed. This local modification provides the necessary stability for recording medium passage while keeping the rest of the device simple, effectively resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The protruding portion is designed to work dynamically with the rotating motion of the rotary body, utilizing the rotational movement to naturally guide the recording medium through the gap. This dynamic approach improves stability without requiring additional complex mechanical structures or control systems.
Data Source
AI summary
An image reading device includes a transport section that transports a recording medium along a transport path, an image reading section that is provided on one side of the transport path and reads an image formed on the recording medium transported through the transport path, a rotary body that is rotatably provided and is provided on a side opposite to an installation side of the image reading section across the transport path, and a protruding portion that is provided at least at one end portion out of one end portion and the other end portion of the rotary body in an axial direction and protrudes from the rotary body toward the image reading section side.