Image Reading Roller Synchronization for Stable Media Feeding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image reading devices face complexity in their transmission systems due to the need for active rotation of paper feeding rollers to maintain constant speed, leading to potential skew or jitter in scanned images, especially with varying document thicknesses.
Innovation Solution
The device employs a simplified structure with active and driven rollers, synchronized by an active and driven transmission mechanism, ensuring consistent rotation speeds and contact between rollers to maintain constant media feeding speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both the paper feeding roller and the pressure roller are connected to a drive motor to rotate actively, then the image media passes at constant speed, but the overall transmission system becomes more complex
Solution Approach 1:
The driven roller uses the friction force generated during image media feeding to rotate actively, eliminating the need for a separate drive motor. The roller self-regulates its rotation through the interaction between its surface and the image media, achieving constant speed feeding without additional active driving components
Solution Approach 2:
The friction force between the driven roller surface and the image media serves as an intermediary mechanism to transmit motion. This friction-based interaction allows the roller to rotate actively in response to feeding conditions without requiring direct mechanical connection to a drive motor
2Stability of the object's composition
If the paper feeding roller and pressure roller are actively driven, then feeding stability improves, but the transmission system complexity increases
Solution Approach 1:
The driven roller achieves stable rotation through self-service mechanism where the friction force from image media feeding automatically regulates its rotational speed. The roller adapts to varying document thicknesses and feeding conditions without external control, maintaining feeding stability through inherent friction-based self-regulation
3Measurement precision
If active rotation of rollers is used to prevent skew and jitter, then image reading accuracy improves, but device structure becomes more complex
Solution Approach 1:
The driven roller prevents skew and jitter through self-regulated rotation driven by friction forces during feeding. This self-service mechanism ensures the roller maintains appropriate rotational speed to keep image media stable during transmission, improving image reading accuracy without requiring complex active control systems
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 stabilizes image feeding, preventing skew and jitter, while simplifying the device's structure by reducing the complexity of the transmission system.
Implementation Method 1
The first driven roller and the second driven roller are respectively pressed against the first active roller and the second active roller
Data Source
AI summary
An image reading device includes a first frame, a second frame disposed to a top of the first frame, a first active roller rotatably disposed to the first frame, a second active roller rotatably disposed to the first frame, a first driven roller rotatably disposed to the second frame, a second driven roller rotatably disposed to the second frame, a driving unit, an active transmission mechanism, a driven transmission mechanism and a reading unit. The driving unit outputs a driving force. The active transmission mechanism is connected between the first active roller and the second active roller. The driven transmission mechanism is connected between the first driven roller and the second driven roller. The reading unit is set to read an image on an image medium transmitted by the first active roller and the second active roller which rotate together.