Sheet Information Collection Device Rear Edge Detection
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Solution Overview
Problem
Conventional sheet handling machines falsely detect clear windows as the rear edge of sheets, leading to incorrect data collection and increased processing time, especially when the clear window extends beyond a predetermined threshold, which limits the length of collectable data and requires increased distance between sheets.
Innovation Solution
A sheet information collection device with a transporter, optical sensor, data collector, determiner, and memory that adjusts thresholds for data collection stop based on the type and position of the sheet, allowing for precise detection of the rear edge and reducing false detection by using smaller thresholds for the rearmost edge region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threshold for data collection stop is increased to avoid false detection of clear windows, then false detection is reduced, but the amount of collectable transmissive light data increases, exceeding storage capacity and reducing processing efficiency
Solution Approach 1:
The patent applies local quality by setting different threshold values for different regions along the transport direction. A first threshold is used for the front region and a second, lower threshold is used for the rear region. This allows the system to tolerate larger clear windows in the front while being more sensitive to rear edge detection, thus reducing false detection without excessively increasing data collection volume.
Solution Approach 2:
The patent changes the parameter of threshold values along the transport direction. By transitioning from a first threshold value to a second threshold value (which is lower) in the rear region, the system dynamically adjusts its detection sensitivity. This parameter change enables accurate rear edge detection while preventing excessive data collection that would occur with a uniformly high threshold.
2Reliability
If the threshold for data collection stop is increased to avoid false detection, then false detection is reduced, but the distance required to detect chained sheets increases, slowing down the process
Solution Approach 1:
By applying different threshold values to different regions (front and rear), the system achieves reliable detection without requiring excessive transport distance. The lower second threshold in the rear region enables quicker detection of chained sheets, maintaining processing speed while ensuring accuracy.
Solution Approach 2:
The dynamic change in threshold parameters along the transport direction allows the system to balance detection accuracy with processing speed. The transition to a lower second threshold in the rear region reduces the detection distance needed for chained sheets, thereby maintaining high processing speed.
3Reliability
If the threshold for data collection stop is increased to avoid false detection, then false detection is reduced, but the time required to collect transmissive light data increases, reducing time for recognition and authentication
Solution Approach 1:
The use of region-specific thresholds (first threshold for front, second threshold for rear) optimizes data collection time. The lower second threshold in the rear region allows the system to stop collecting data sooner after the rear edge passes, reducing total collection time while maintaining detection accuracy.
Solution Approach 2:
By changing the threshold parameter from a first value to a second, lower value in the rear region, the system reduces the time required to collect transmissive light data. This parameter change ensures that data collection stops promptly after the rear edge is detected, preserving time for recognition and authentication processes.
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
The solution reduces extra data collection and false detection of the rear edge, enabling efficient collection of sheet information without shortening the maximum collectable length or lengthening the distance between sheets, thus maintaining processing time for recognition and authentication.
Implementation Method 1
an optical sensor configured to scan the transported sheet in a transport direction and output transmissive light data acquired at a plurality of collection points set in the transport direction
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
The present invention provides a sheet information collection device that is, for example, a sheet information collection device for collecting information of a sheet including a transparent portion. The device includes: an optical sensor configured to output transmissive light data acquired at a plurality of collection points set in a transport direction of the sheet; a data collector configured to collect the transmissive light data from the optical sensor; a determiner configured to determine transmission or blocking of light at each collection point; a recorder configured to store thresholds set for the collection points; and a data collection stopper configured to stop collection of the transmissive light data by the data collector when the determiner determines that light is transmitted at successive collection points in the transport direction and the number of the successive collection points is equal to or greater than one of the thresholds corresponding to the successive collection points, wherein among the thresholds, a threshold corresponding to a rearmost edge region of the sheet is smaller than the thresholds corresponding to another region.