Printer Print Permission Control via Coloring Agent Monitoring
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Solution Overview
Problem
In subscription-based printer services, users are not allowed to print when the remaining amount of coloring agent in the cartridge falls below a certain threshold, leading to service disruptions and potential loss of productivity, especially in contract mode where the print permission mode is inactive.
Innovation Solution
An image forming apparatus and server system that dynamically switches the print permission mode from inactive to active when the remaining coloring agent reaches a dispatch threshold, allowing printing even when the cartridge should be replaced, and includes a mechanism to activate the print permission mode upon receiving a specific instruction, enabling continued printing and charging adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the print permission mode is inactivated in contract mode to ensure service quality, then printing is prevented when cartridge replacement is needed, but this causes service disruptions and productivity loss
Solution Approach 1:
The system dynamically switches the print permission mode between active and inactive states based on the remaining coloring agent amount. When the amount exceeds the dispatch threshold, printing is permitted even in contract mode. When it falls below the threshold, printing is restricted to maintain service quality. This dynamic adjustment resolves the contradiction by adapting the restriction level to the actual cartridge status.
Solution Approach 2:
The system changes the parameter of print permission status based on the remaining coloring agent amount. By monitoring this parameter and switching the permission mode accordingly, the system ensures service quality when needed while maintaining productivity when the cartridge is still functional.
2Productivity
If the print permission mode is activated to maintain productivity, then printing continues even with low coloring agent, but this may lead to poor print quality and service issues
Solution Approach 1:
The system dynamically adjusts the print permission mode based on real-time monitoring of the remaining coloring agent amount. When the amount is sufficient (above dispatch threshold), printing is permitted to maintain productivity. When it drops below the threshold, the system automatically restricts printing to prevent quality degradation, thus resolving the contradiction through adaptive control.
3Reliability
If the print permission mode is restricted in contract mode, then service quality is maintained, but users experience service disruptions when cartridges need replacement
Solution Approach 1:
The system performs preliminary action by notifying users in advance when the remaining coloring agent amount reaches the dispatch threshold. This notification is sent before printing is restricted, giving users time to prepare for cartridge replacement. This approach maintains service quality while improving user convenience by avoiding sudden service disruptions.
Solution Approach 2:
The system implements feedback by notifying users of the remaining coloring agent status before restricting printing. This feedback mechanism allows users to anticipate and prepare for cartridge replacement, reducing the impact of service restrictions on user convenience while maintaining service quality.
4Productivity
If the system monitors remaining coloring agent amount continuously, then printing permission can be adjusted timely, but this increases system complexity
Solution Approach 1:
The cartridge unit performs self-service by autonomously measuring and reporting its own remaining coloring agent amount to the image forming apparatus. This eliminates the need for complex external monitoring systems, as the cartridge itself provides the necessary data through integrated sensors and communication capabilities.
Data Source
AI summary
An image forming apparatus includes a memory and a controller. The memory stores first mode information indicating whether the apparatus is set to a contract mode or a normal mode, and second mode information indicating whether a print permission mode is active or inactive. The controller sets the second mode information to active information indicating that the print permission mode is active in a state in which the first mode information indicates the normal mode, sets the second mode information to inactive information indicating that the print permission mode is inactive in a state in which the first mode information indicates the contract mode, and rewrites the second mode information to the active information when an instruction to activate the print permission mode is received in a state in which the first mode information indicates the contract mode and the second mode information is set to the inactive information.