Dynamic Tilt Threshold for Paper Conveyance
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Solution Overview
Problem
Existing paper conveyance devices risk damaging documents by catching them on the side edges of the conveyance path, especially when the documents are tilted or have larger dimensions, leading to unnecessary stops and inefficiencies in the conveyance process.
Innovation Solution
A paper conveyance device equipped with a width dimension detector, tilt degree detector, stopper, and threshold value setter, which adjusts the threshold value based on the detected width dimension and tilt degree to prevent document damage and ensure efficient conveyance without unnecessary stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed threshold value is used to stop conveyance when tilt degree exceeds the threshold, then documents with large width dimensions are protected from damage, but documents with small width dimensions are unnecessarily stopped
Solution Approach 1:
The threshold value is changed from a fixed value to a dynamic value that varies according to the width dimension of the document. The threshold value setter automatically adjusts the threshold based on detected width dimensions, allowing the system to adapt to different document sizes and avoid unnecessary stops for small documents while maintaining protection for large documents.
Solution Approach 2:
The threshold parameter is modified based on the width dimension parameter. When the width dimension detector detects a smaller width, the threshold value setter reduces the threshold value accordingly, enabling the tilt degree detector to allow larger tilt angles for narrow documents that are less likely to be caught on side edges.
2Reliability
If the threshold value is set low to prevent damage to large documents, then document safety is improved, but conveyance is stopped frequently causing inefficiency
Solution Approach 1:
The threshold value dynamically adapts to each document's width dimension rather than using a conservative fixed low value. This allows the system to maintain high safety for large documents while enabling continuous conveyance for small documents that pose minimal risk.
Solution Approach 2:
Different threshold values are applied to different document width categories. Large documents receive stricter threshold control for safety, while small documents receive more lenient thresholds that allow efficient conveyance without unnecessary interruptions.
Data Source
AI summary
According to an automatic document feeder of a multifunction peripheral according to the present invention, two tilt sensors are provided in the middle of a document conveyance path to detect a tilt degree of a document being conveyed along the document conveyance path. Here, for example, if the positional deviation representing the tilt degree of the document is greater than a predetermined threshold value ΔLs, the conveyance of the document is stopped. On the other hand, if this is not the case, the conveyance of the document is continued. In addition, the threshold value is set in accordance with the width dimension of the document, and in particular, the larger the width dimension, the smaller the threshold value.