Printing Apparatus Tray Height Detection and Discharge Control
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Solution Overview
Problem
Existing printing apparatuses disrupt user workflow when paper discharge errors occur, as they often require users to clear errors in all trays before resuming printing, potentially causing unfavorable influences on ongoing work.
Innovation Solution
A printing apparatus with detection mechanisms to assess sheet heights on multiple trays, allowing controlled discharge continuation on trays where errors have been cleared, prioritizing paper discharge on trays other than the last to clear errors, thereby minimizing workflow disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the printing apparatus waits for all paper discharge tray errors to be cleared before resuming printing, then printing reliability is improved, but productivity deteriorates due to workflow interruption
Solution Approach 1:
The system segments the paper discharge trays and implements independent error handling for each tray. When an error occurs in one tray, printing can continue by diverting output to other available trays, rather than halting the entire printing process. This segmentation allows the system to maintain overall printing reliability while avoiding complete workflow interruption.
Solution Approach 2:
The system dynamically adjusts the printing workflow based on the real-time status of paper discharge trays. When errors are detected, the system automatically redirects paper discharge to alternative trays and dynamically resumes printing on previously affected trays once errors are cleared, maintaining continuous operation and productivity.
2Productivity
If printing resumes immediately when one tray error is cleared, then productivity is improved, but ease of operation deteriorates as users may be interrupted while clearing errors
Solution Approach 1:
The system performs preliminary actions by proactively identifying which trays have errors and which are available for discharge. Before resuming printing, the system evaluates the error status of all trays and determines the optimal discharge destination, ensuring that printing can resume without interrupting user error-clearing activities.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring the error status of paper discharge trays and using this information to dynamically control printing operations. The controller receives feedback from detection mechanisms about tray status and adjusts printing behavior accordingly, resuming discharge only when it will not interfere with user work.
3Measurement precision
If the system monitors all tray heights continuously, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection mechanisms are integrated into the existing tray structures, allowing trays to self-report their status through simple detection mechanisms rather than requiring complex external monitoring systems. The detection mechanisms work autonomously to identify when trays are full or have errors, providing precise measurement without adding significant system complexity.
Data Source
AI summary
There is provided a printing apparatus including: a printing mechanism; a plurality of trays; a discharge mechanism; a plurality of detection mechanisms which detect whether a height of the sheets stacked on the trays is not less than a threshold value; and a controller which controls the discharge mechanism and the printing mechanism. When the detection mechanisms detect that all heights of the sheets stacked on the trays are not less than the threshold value, the controller controls the discharge mechanism to discontinue a discharge of the sheets. After the discharge of the sheets is discontinued, when the detection mechanisms detect that the heights of the sheets stacked on at least two trays became smaller than the threshold value, the controller controls the discharge mechanism to resume the discharge of the sheets on a tray which is other than a tray which is recovered last.