Medium Feeding Device Skew Detection and Multi-Feeding Prevention
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Solution Overview
Problem
Existing medium feeding devices face challenges in detecting skew and preventing multi-feeding, which can lead to inaccurate image reading and increased risk of multi-sheets being fed simultaneously, affecting detection precision and accuracy.
Innovation Solution
A medium feeding device with a feeding section comprising a feed roller and a separation roller, where sensors are aligned in a sensor line extending from an upstream region to a downstream region, allowing for precise detection of skew and employing a separation roller with variable separating power to prevent multi-feeding by adjusting the rotational load and pressing power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection sensors are arranged in series in the width direction of the medium, then skew detection capability is provided, but detection precision is insufficient
Solution Approach 1:
The patent transitions from arranging sensors only in the width direction (one dimension) to arranging sensor lines in both the width direction and the feeding direction (two dimensions). Multiple sensor lines are positioned at different locations including upstream, nip region, and downstream areas, creating a two-dimensional detection network that significantly improves skew detection precision while maintaining manageable device complexity.
2Reliability
If a separation roller is used to prevent multi-feeding, then single-sheet feeding reliability is improved, but the complexity of adjusting separating power increases
Solution Approach 1:
The patent implements a variable separating power mechanism where the separation roller's pressing force against the feed roller can be dynamically adjusted. The pressing power is made variable to adapt to different paper types and feeding conditions, allowing the system to maintain high single-sheet feeding reliability without requiring an overly complex fixed mechanism. This dynamic adjustment capability resolves the contradiction by providing flexibility rather than rigid 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
Enhances skew detection precision and reduces the risk of multi-feeding by accurately detecting and correcting skew before feeding, ensuring accurate image reading and reliable single-sheet feeding.
Implementation Method 1
a feed roller 24 and a separation roller 25 that feed the medium 99 by rotational force of the rollers 24, 25 themselves
Implementation Method 2
sensors 16 for detecting the medium 99
Data Source
AI summary
A medium feeding device is provided with a feeding section for feeding a medium and sensors for detecting the medium. The feeding section includes a feed roller and a separation roller, the sensors form a sensor line in which the plurality of sensors is aligned in a feeding direction of the medium to be fed, the two sensor lines are arranged in such a manner that the sensors overlap with each other in a width direction of the medium to be fed, and the sensor lines are so configured as to extend, in the feeding direction, from an upstream region upstream of a nip point where the feed roller and the separation roller make contact with each other, a nip region including the nip point, and to a downstream region downstream of the nip point.