Sheet Conveyance Anomaly Detection Using Passage Interval Thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sheet conveyance issues in image forming apparatuses, such as printers and copiers, lead to jams and image processing degradation due to abnormal sheet conveyance speeds, which existing technologies fail to detect and address effectively.
Innovation Solution
A sheet processing apparatus equipped with a roller and a sensor to detect sheet passage intervals, calculating thresholds for normal and abnormal conveyance speeds, and generating alerts when these thresholds are exceeded, allowing for timely maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sheet conveyance is performed using rollers, then sheets can be conveyed through the image forming apparatus, but sheet conveyance may become excessively slow or fast due to roller degradation and other fault conditions, leading to jams or image processing degradation
Solution Approach 1:
The system uses sensors to detect sheet passage intervals and provides feedback to the control unit, which compares the detected intervals against predetermined thresholds to determine abnormal conveyance conditions. This closed-loop feedback mechanism enables reliable detection of roller degradation and conveyance anomalies without requiring complex mechanical modifications.
Solution Approach 2:
The patent replaces complex mechanical monitoring systems with an optical/electronic sensing approach. Instead of using mechanical sensors or switches that require physical contact with moving parts, the system uses light-based sensors to detect sheet passage timing, thereby reducing mechanical complexity while improving reliability.
2Reliability
If existing technologies are used for detecting sheet conveyance issues, then the system remains simple, but sheet conveyance anomalies are not detected and addressed effectively, leading to jams and image processing degradation
Solution Approach 1:
The system introduces sheet passage interval as an intermediary measurement parameter. Instead of directly measuring roller rotational speed or sheet conveyance velocity, the system measures the time interval between successive sheet passages at a fixed sensor location. This intermediary parameter simplifies the detection process while providing accurate information about conveyance abnormalities.
Solution Approach 2:
The sensor system automatically detects and reports sheet conveyance anomalies without requiring external intervention or complex measurement equipment. The control unit processes the sensor data internally, comparing it against stored thresholds to self-diagnose conveyance problems, thereby reducing the difficulty of detection while maintaining high reliability.
3Productivity
If sheet conveyance speed is not monitored, then the system operates with fewer components, but abnormal speeds lead to jams or degradation of image processing
Solution Approach 1:
The system implements periodic monitoring of sheet passage intervals at regular intervals as sheets convey through the apparatus. The control unit continuously compares each measured interval against predetermined thresholds, enabling early detection of roller degradation trends before they cause jams or image quality problems, thus maintaining continuous productivity.
Solution Approach 2:
The periodic detection of sheet passage intervals provides continuous feedback about roller performance. When the control unit detects that intervals consistently exceed or fall below thresholds, it generates alerts for maintenance, allowing the system to maintain high productivity by preventing abnormal conditions from developing into failures.
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 system effectively detects and alerts users to sheet conveyance anomalies, preventing jams and maintaining image processing quality by identifying and addressing issues before they cause malfunctions.
Implementation Method 1
a sheet sensor disposed in the sheet conveyance path and configured to detect each sheet of the plurality of sheets as the sheet is conveyed by a particular roller of the at least one roller
Data Source
AI summary
A sheet processing apparatus comprises at least one roller disposed in a sheet conveyance path and configured to convey a plurality of sheets; a sheet sensor disposed in the sheet conveyance path and configured to detect each sheet as it is conveyed by a particular roller of the at least one roller and to generate sensor information indicative of the detection; and a controller configured to: use the sensor information to calculate a sheet passage interval for each sheet; count a first number of times the sheet passage interval is greater than a first threshold corresponding to abnormally slow sheet conveyance and a second number of times the sheet passage interval is lower than a second threshold corresponding to abnormally fast sheet conveyance; determine whether an alert condition has been met based on the counts of the first and second numbers of times; and generate a control signal after the alert condition has been met.