Printing Device Consumable Life Reset via Sub-Counter Segmentation
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Solution Overview
Problem
Printing devices cannot accurately track the remaining life of remanufactured consumable items like toner cartridges, leading to premature replacement and inventory management issues, as the counter memory is typically one-way and cannot be reset by remanufacturers.
Innovation Solution
The printing device identifies remanufactured cartridges by determining if the counter has reached an end-of-life threshold and resets it by using sub-counters and a selector field to track the remaining life, allowing for accurate monitoring and estimation of the consumable's life span.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way counter memory is used to track remaining life, then the counter can be reliably decremented during usage, but the counter cannot be reset for remanufactured cartridges
Solution Approach 1:
The counter memory is segmented into multiple sub-counters (first sub-counter, second sub-counter, etc.) with a selector field that indicates which sub-counter is currently active. This segmentation allows the system to switch between different counter segments, enabling reset functionality while maintaining reliable tracking in the active segment.
Solution Approach 2:
The solution adds a new dimension to the counter structure by introducing multiple sub-counters and a selector field. Instead of modifying the one-way counter directly, the system creates a hierarchical structure where the selector field acts as an additional dimension to navigate between sub-counters, enabling reset capability without compromising the one-way decrement reliability of individual sub-counters.
2Measurement precision
If the counter is reset for remanufactured cartridges, then accurate remaining life tracking can be maintained, but the one-way memory constraint prevents resetting
Solution Approach 1:
The counter is divided into multiple sub-counters that can be independently managed. When reset is needed, the system switches to a different sub-counter rather than modifying the current one, maintaining measurement precision while enabling reset functionality through the segmented structure.
Solution Approach 2:
The selector field acts as an intermediary between the control circuit and the sub-counters. It manages the switching between different counter segments, allowing the control circuit to reset the counter by changing the selector field value without directly modifying the counter memory structure, thus reducing complexity.
3Ease of manufacture
If remanufactured cartridges are used, then cost-effective reuse is achieved, but the printing device cannot accurately track their remaining life
Solution Approach 1:
The counter memory is segmented into multiple sub-counters, allowing the system to preserve remaining life information across remanufacturing cycles. When a cartridge is remanufactured, the selector field can be updated to point to a fresh sub-counter, preserving the ability to track remaining life accurately while supporting easy remanufacturing.
Solution Approach 2:
The system discards the depleted counter information by switching to a different sub-counter when reset is needed, while recovering the tracking capability by initializing a new sub-counter. This allows remanufactured cartridges to have their remaining life accurately tracked without losing the ability to distinguish between original and remanufactured units.
Data Source
AI summary
A printing device determines that a consumable item newly installed within a printing device has previously been used, based on a remaining life of the consumable item. In response to determining that the consumable item has previously been used, the printing device resets the remaining life of the consumable item.