Untaken Sheet Notification Device Counter Logic
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Solution Overview
Problem
Existing document feeder systems fail to reliably notify when a sheet is untaken from the ejection tray, especially when the sheet is bent, curled, or thin, as actuator-type sensors may not detect the presence of these types of documents, leading to incomplete notification.
Innovation Solution
Incorporating a counter to track the number of ejected sheets and a notification controller that initiates specific notification patterns, such as lighting patterns, if the sheet count is below a predetermined threshold, ensuring untaken sheet notification even if the ejection tray sensor does not detect the sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an actuator-type ejection tray sensor is used to detect sheet presence, then the device structure remains simple, but the detection reliability deteriorates when sheets are thin, bent, or curled
Solution Approach 1:
The detection function is segmented into two independent systems: a traditional ejection tray sensor for general detection and a new counter mechanism for verifying sheet ejection count. This segmentation allows each system to operate independently, with the counter providing backup detection capability when the sensor fails to detect thin or bent sheets.
Solution Approach 2:
The counter acts as an intermediary verification mechanism between the ejection process and the notification system. Instead of relying solely on direct sensor detection, the counter provides indirect verification by tracking the number of sheets ejected, thereby compensating for sensor failures with thin or bent sheets.
2Measurement precision
If only ejection tray sensor detection is used for untaken sheet notification, then the notification system remains simple, but the notification accuracy deteriorates when sheets are not properly detected
Solution Approach 1:
The system implements feedback by continuously monitoring the relationship between the number of sheets ejected (counted by the counter) and the sensor detection status. When the counter indicates sheets should be present but the sensor detects absence, the system generates a notification, thereby improving notification accuracy through closed-loop verification.
Solution Approach 2:
The counter performs preliminary action by tracking sheet ejection before the notification decision is made. This advance counting allows the system to predict which sheets should be present on the ejection tray and verify their presence, improving notification accuracy before the actual notification is triggered.
3Reliability
If the ejection tray sensor detects sheet presence reliably, then untaken sheet notification works correctly, but the sensor fails to detect thin or bent sheets causing incomplete notification
Solution Approach 1:
The counter provides beforehand cushioning by maintaining a record of expected sheet presence independent of sensor detection. This preparatory counting creates a safety buffer that prevents information loss about untaken sheets, even when the sensor fails to detect thin or bent sheets that should be present on the ejection tray.
Data Source
AI summary
An untaken sheet notification device to notify that the sheet is untaken from an ejection tray if an ejection tray sensor that detects presence or absence of the sheet on the ejection tray detects presence of the sheet, after a sheet is ejected, a document feeder, and an image forming apparatus include a counter that counts the number of the ejected sheets and a notification controller that performs a specific notification control to notify that the sheet is untaken if the number of the sheets counted by the counter is equal to or less than a predetermined reference number.