Printer Jam Detection via Sheet Count Logic
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Solution Overview
Problem
Conventional printing apparatuses face difficulties in detecting and addressing errors caused by protective members, as sensors find it challenging to install due to the shape and position of these members, leading to recurring jamming issues even after users remove apparent jams.
Innovation Solution
A printing apparatus with a detecting unit for sheet jamming, a determining unit to count discharged sheets, and a notification unit that alerts users to remove protective members if the sheet count is below a predetermined number, allowing for proper error identification and user notification without direct protective member detection sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is installed to detect the protective member, then detection accuracy is improved, but device complexity and installation difficulty increase due to the shape and position of the protective member
Solution Approach 1:
The invention extracts the detection function from a physical sensor and implements it through software logic. The control unit determines the presence of the protective member by analyzing the relationship between sheet jamming detection and the number of discharged sheets, rather than using a dedicated sensor. This eliminates the need for complex sensor installation while maintaining detection capability.
Solution Approach 2:
The invention uses the sheet discharge count as an intermediary parameter to infer the presence of the protective member. Instead of directly detecting the protective member, the system uses the number of discharged sheets as a mediator to indirectly determine whether the protective member is still in place, solving the detection problem without requiring direct sensor contact with the protective member.
2Ease of operation
If the printing apparatus displays a generic jamming error message, then users can respond to apparent jams, but recurring errors occur when the root cause (protective member not removed) is not identified
Solution Approach 1:
The system implements feedback by monitoring the number of discharged sheets and using this information to dynamically adjust error messages. When the discharge count is below a threshold, the system provides feedback indicating the protective member may not be removed. This feedback loop enables users to understand the root cause and take appropriate action, preventing recurring errors.
Solution Approach 2:
The system performs preliminary analysis by tracking the number of discharged sheets before displaying error messages. This preliminary action allows the control unit to determine whether a jamming error is likely caused by the protective member being in place, enabling proactive guidance to users before they attempt to resolve the error, thereby preventing repeated unsuccessful attempts.
3Device complexity
If the apparatus provides generic error notifications, then implementation is simple, but users cannot distinguish between protective member issues and actual sheet jams
Solution Approach 1:
The invention changes the parameter used for error notification from a static generic message to a dynamic message based on the sheet discharge count parameter. By monitoring how many sheets have been discharged since the protective member should have been removed, the system adjusts the error message content to provide specific information about whether the protective member is likely still in place, thereby preserving error cause information without significantly increasing system complexity.
Data Source
AI summary
A printing apparatus notifies a user of a message that jamming may be attributed to a protective member yet to be removed, without providing any sensor for detecting the protective member. A method for controlling a printing apparatus that conveys a sheet includes detecting sheet jamming, determining a number of discharged sheets, and notifying the user to remove the protective member present on a conveyance path if the sheet jamming is detected and the number of discharged sheets is determined to be less than a predetermined number, and notifying the user of the sheet jamming if the sheet jamming is detected and the number of discharged sheets is determined to be equal to or greater than the predetermined number.