Printer Cartridge Memory Access for Vibration-Resilient Printing
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Solution Overview
Problem
Existing printers with removably mountable toner cartridges experience communication abnormalities due to vibrations and electric noise, leading to suspended or stopped printing even when no memory failure occurs.
Innovation Solution
A printing device with a controller that performs first and second access processes to a cartridge memory, retrying access failures, and continues printing until successful communication is reestablished during non-operational periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If communication with the memory is performed during the printing process, then information can be updated in real-time, but communication abnormalities occur due to vibrations and electric noise
Solution Approach 1:
The patent performs memory access operations before the printing process starts (in the standby state) rather than during printing. This preliminary action ensures that all necessary communication with the memory is completed before vibrations and electric noise from the printing process begin, thereby preventing communication abnormalities while maintaining real-time information updates.
Solution Approach 2:
The patent introduces a control state mechanism that mediates between the printing process and memory access operations. By transitioning the system to a standby state for memory access and then returning to the printing state, the control mechanism acts as an intermediary that separates the two operations in time, avoiding interference while maintaining coordination.
2Reliability
If printing is suspended upon access failure, then data integrity is maintained, but printing stops even when no memory failure occurs
Solution Approach 1:
The patent dynamically adjusts the error handling strategy based on when the access failure occurs. If access fails during the standby state, the system maintains data integrity by treating it as a critical error. If access fails during the printing process, the system continues printing to maintain productivity, recognizing that transient communication errors are more likely and less critical than memory failures.
Solution Approach 2:
The patent changes the system's response parameter (error handling mode) based on the operational state. In the standby state, the system uses a strict error handling mode that suspends printing on access failure. During the printing process, the system switches to a tolerant error handling mode that allows printing to continue, thereby adapting the reliability-productivity balance to the current operational context.
Data Source
AI summary
A printing device, including: a cartridge storing developer; a memory provided in the cartridge; and a controller configured to execute a printing process of operating the cartridge form a developer image on a sheet by use of the developer in the cartridge, a first access process of performing access to the memory when the printing process is not being executed, and a second access process of performing access to the memory in a period in which the printing process is being executed, in response to a predetermined operation of the printing device, wherein, when an access failure occurs in the first access process, the controller notifies an error, and wherein, when an access failure occurs in the second access process, the controller continues the printing process and executes the second access process again in response to a next timing of the predetermined operation of the printing device.