Optical Fold Detection in Medium Feeders to Prevent Jams
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Solution Overview
Problem
Medium conveying apparatuses struggle to separate and feed folded or bound media, such as passports or brochures, leading to potential jams during the conveyance process.
Innovation Solution
Incorporation of first and second optical sensors on the medium conveying apparatus to detect medium folding by emitting light in different directions, allowing the processor to stop the feed roller based on the detection results, thereby preventing jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the medium conveying apparatus uses a feed roller to separate and feed media, then it can efficiently convey multiple media, but it cannot properly handle folded or bound media, causing medium jams
Solution Approach 1:
The optical sensors detect folded or bound media before the feed roller attempts to separate and convey them. By identifying problematic media in advance and stopping the feed roller before engagement, the system prevents jams from occurring, allowing efficient handling of both regular and folded media without compromising reliability
2Ease of operation
If the apparatus conveys folded media without detection, then the feeding process continues uninterrupted, but folded media cannot be separated properly, leading to jams
Solution Approach 1:
The optical sensors continuously monitor the media on the tray and provide feedback to the control unit. When folded or bound media are detected, the control unit receives this information and stops the feed roller, preventing the harmful jamming effect while maintaining ease of operation through automatic detection and response
3Measurement precision
If height detection sensors are used to detect medium position, then medium stacking can be monitored, but folded media cannot be distinguished from stacked media, reducing detection accuracy
Solution Approach 1:
Instead of relying solely on height detection in the vertical dimension, the patent introduces optical sensors that detect media characteristics in the horizontal plane by analyzing light reflection patterns. This additional dimensional approach enables distinction between folded media (which create specific reflection patterns) and simply stacked media, enhancing both measurement precision and adaptability
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
Effectively detects and prevents medium folding, ensuring smooth conveyance and reducing the likelihood of jams by accurately identifying and responding to folded or bound media.
Implementation Method 1
a first light emitter for emitting first light and a first light receiver for generating a first signal based on receiving the first light
Data Source
AI summary
A medium conveying apparatus includes a first optical sensor located on an upper part of the housing and in a central part of the housing in a direction perpendicular to a medium conveying direction, a second optical sensor located on an upper part of the housing and on a side of the first optical sensor in the direction perpendicular to the medium conveying direction, and a processor to detect a folding of a medium based on the first signal or the second signal, and stop feeding of the medium by the feed roller in accordance with a detection result of the folding of the medium. The first light emitter emits first light toward a downstream side of the medium in the medium conveying direction, and the second light emitter emits second light toward an upstream side of the medium in the medium conveying direction.