Document Feeding Control for Static Adhesion Jam Prevention
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Solution Overview
Problem
Existing image forming apparatuses face issues with paper jams due to document adhesion caused by static electricity, particularly in varying environmental conditions, leading to repeated jams even after restarting the feeding process.
Innovation Solution
A document conveyance apparatus equipped with a detection sensor to stop document feeding if a document is not detected within a predetermined time, accompanied by a display prompting the user to loosen the document bundle under certain environmental conditions, and a controller to manage feeding based on temperature and humidity sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a double-feeding sensor is used to detect documents in a double feeding state, then document separation detection is improved, but the apparatus cannot detect adhesion occurring before documents reach the sensor position
Solution Approach 1:
The system performs preliminary detection of document adhesion by monitoring feeding time and environment conditions before documents actually reach the double-feeding sensor. The control unit predicts potential adhesion issues by checking if the time from separation nip to sensor detection exceeds a threshold, allowing early intervention before jams occur.
Solution Approach 2:
The system establishes a feedback loop where the control unit continuously monitors feeding time, environmental conditions (temperature and humidity), and sensor detection status. When adhesion is detected or predicted, the system provides feedback by displaying guidance messages to users and automatically adjusting feeding operations to prevent recurring jams.
2Productivity
If feeding is restarted after a jam detection, then document processing continues, but jams repeatedly occur because adhesion has not been cleared
Solution Approach 1:
Before restarting feeding operations, the system performs preliminary checks of environmental conditions and displays guidance messages to users to loosen adhered documents. This preliminary action prevents immediate re-occurrence of jams by addressing the root cause of adhesion before resuming high-speed feeding.
Solution Approach 2:
The system dynamically adjusts feeding operations based on real-time conditions. When adhesion is detected, feeding is temporarily suspended and environmental parameters are monitored. Once conditions improve or user intervention occurs, feeding resumes with adjusted timing parameters to prevent recurring adhesion issues.
3Reliability
If environment sensing is added to detect temperature and humidity, then adhesion prediction capability is improved, but device complexity increases
Solution Approach 1:
The environment sensor unit serves multiple functions: it detects temperature and humidity for adhesion prediction, monitors operational conditions for optimal feeding parameters, and provides data for predictive maintenance. This multi-functionality justifies the added complexity by providing comprehensive system optimization beyond just adhesion detection.
Solution Approach 2:
The system uses readily available environmental data that can be obtained through simple sensors, rather than requiring complex document analysis systems. The control unit self-adjusts feeding parameters based on environmental conditions, reducing the need for manual intervention and complex mechanical adjustment mechanisms.
Data Source
AI summary
A document conveyance apparatus includes a document tray, a separation feeding unit configured to form a separation nip for separating the documents one by one and to feed a document, a detection sensor configured to detect the document, a controller configured to stop feeding of the document based on the detection sensor, an environment sensor configured to acquire environment information, and a display. When the controller stops feeding of the document, (a) in a case where the environment information acquired by the environment sensor satisfies a predetermined condition, the display displays a screen for prompting a user to loosen a bundle of documents, and (b) in a case where the environment information acquired by the environment sensor does not satisfy the predetermined condition, the display does not display the screen for prompting the user to loosen the bundle of documents.