Image Reader Vibration Isolation via Resilient Frame Mounting
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Solution Overview
Problem
Vibration from sheet conveying components and motors in image reading apparatuses leads to inaccurate image reading due to direct propagation of vibrations to the reader, affecting the stability and accuracy of the image reading process.
Innovation Solution
The image reading apparatus is designed with a resiliently supported conveyer housing and frame structure, where the conveyer housing is fixed to the frame using resilient members with lower rigidity than the frame's beams, and the reader is fixed to the beams, isolating vibrations and preventing their propagation to the reader.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the conveying system is directly placed on the reader, then the device structure is simplified, but vibration from the conveying system directly propagates to the reader causing inaccurate image reading
Solution Approach 1:
The device is divided into two independent modules: the reader module and the conveying system module. Each module is separately mounted on the frame, allowing them to function independently without direct mechanical coupling. This segmentation prevents vibration transmission while maintaining structural simplicity.
Solution Approach 2:
The conveying system is extracted from the reader assembly and mounted separately on the frame. By removing the direct mechanical connection between the conveying system and the reader, the harmful vibrations from the conveying motor and rollers are isolated, preventing them from affecting image reading accuracy.
2Measurement precision
If multiple mirrors are used in the optical system, then the light path length is sufficient for accurate reading, but the reader becomes more vulnerable to vibration
Solution Approach 1:
The frame serves as an intermediary structure that supports both the reader and conveying system at a distance. By mounting the reader on the frame rather than directly on the conveying system, the frame acts as a vibration-isolating intermediary that allows the optical system to maintain its required light path length while protecting it from vibration.
3Ease of operation
If the conveying motor drives the conveying rollers with gears and pulleys, then the conveying function is achieved, but additional vibration sources are introduced
Solution Approach 1:
The transmission components (gears and pulleys) are extracted as separate vibration sources from the reader assembly. By mounting the conveying system with its transmission components on the frame rather than on the reader, these harmful vibration-generating elements are isolated from the sensitive reading operation.
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 configuration effectively attenuates vibrations, ensuring accurate image reading by maintaining precise relative displacement between the reader and the sheet, reducing downtime due to easy replacement and handling of jams, and enhancing productivity.
Implementation Method 1
the columns are provided with resilient conveying-housing fixing members, the conveying-housing fixing members each having a length smaller than the distance between the adjacent columns
Implementation Method 2
a resiliently supported conveyer housing and frame structure, where the conveyer housing is fixed to the frame using resilient members with lower rigidity than the frame's beams
Data Source
AI summary
An image reading apparatus includes a reader, a conveying path, a conveyer, a conveyer housing, and a frame. The conveying path guides the sheet having the image to a reading position and guides the sheet read by the reader in an ejecting direction. The conveyer conveys the sheet along the conveying path. The conveyer housing supports the conveying path and the conveyer. The frame comprises columns and beams that connect adjacent columns. The frame individually fixes the reader and the conveyer housing. The columns are provided with resilient conveying-housing fixing members, the conveying-housing fixing members each having a length smaller than the distance between adjacent columns. The conveying-housing fixing members comprise a material having rigidity lower than the material of the beams. The conveyer housing is fixed to the frame by the conveying-housing fixing members. The reader is fixed to the beams.