Printer Paper Cassette Residual Quantity Detection
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Solution Overview
Problem
Existing print systems fail to detect paper shortages before starting a print job, leading to potential operation suspension and uncertainty among shared printer users, especially during heavy print jobs.
Innovation Solution
A print system where a printer and client personal computer are network-connected, with nonvolatile memory in each paper feed cassette to track residual paper quantities, allowing the client PC to check availability before sending print data and alert users of potential shortages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the printer body controls and compares residual paper information only after all print data is sent, then the printer can prevent suspension during printing, but the user cannot know the exhaustion state before starting printing
Solution Approach 1:
The system performs preliminary paper sufficiency judgment before the print job starts. The client PC obtains residual paper information from the printer's nonvolatile memory and determines whether paper is sufficient before sending print data, allowing users to know the exhaustion state in advance and take preventive actions.
Solution Approach 2:
The system implements feedback by having the printer continuously store and provide residual paper information to the client PC. The client PC receives real-time paper status information, processes it, and provides feedback to the user through UI display, enabling informed decisions about print jobs.
2Productivity
If multiple users share the same printer with simultaneous heavy print jobs, then printer utilization increases, but the state of paper exhaustion becomes unknown until all jobs are executed
Solution Approach 1:
Each user's client PC performs preliminary paper sufficiency judgment before initiating their print job. By checking residual paper information in advance and comparing it with the required paper quantity for the current job, users can determine whether to proceed, pause, or cancel their print job before consuming shared paper resources.
3Reliability
If the system always reserves sufficient paper in the paper feed cassette, then print job suspension is prevented, but users cannot detect potential shortages before printing starts
Solution Approach 1:
The system provides continuous feedback about paper status by having the client PC obtain residual paper information from the printer and present it to the user through the UI. This feedback mechanism allows users to be aware of paper levels and potential shortages before initiating print jobs, enabling proactive paper management.
Data Source
AI summary
The present invention is a printer having a plurality of paper feed cassettes, a function, when recording sheets of paper are exhausted in any of the paper feed cassettes, for detecting exhaustion of sheets of paper, and a function, when sheets of paper in an identified paper feed cassette are exhausted, for automatically switching the paper feed destination when there are sheets of paper of the same size in another paper feed cassette and the printer has a function, when judging an occurrence of exhaustion of sheets of paper, for notifying a user of it beforehand.