Printing Device Token System for Print Material Cartridge Wastage
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Solution Overview
Problem
Printing devices often prematurely replace cartridges, leading to wastage of remaining print material due to incorrect interpretation of low supply notifications, resulting in unnecessary replacement before the material is fully depleted.
Innovation Solution
Implementing a dual-threshold system where the printing device requests a token from a computing device only when the remaining print material supply reaches a second threshold, ensuring that the replacement cartridge is used only after the original cartridge's supply has dropped below this threshold, thereby reducing wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a notification is provided when remaining print material supply is running low, then users are informed of low supply, but premature cartridge replacement occurs leading to print material wastage
Solution Approach 1:
The patent introduces a second threshold parameter (lower than the first threshold) to control when replacement cartridges can be used. This parameter change ensures that even when users are notified at the first threshold, the replacement cartridge cannot be activated until the second threshold is reached, preventing premature replacement and material wastage
Solution Approach 2:
The patent introduces a token as an intermediary mechanism between the notification system and cartridge usage. The token is generated when the second threshold is reached and is required to activate the replacement cartridge, serving as a mediator that prevents premature usage even when users have been notified earlier
2Ease of operation
If replacement cartridge is made available when first threshold is reached, then users can replace cartridge, but remaining print material in first cartridge is wasted
Solution Approach 1:
The patent changes the activation parameter for replacement cartridges from being available at the first threshold to requiring the second threshold to be reached. This ensures that replacement cartridges remain inactive and cannot be used until the original cartridge has been depleted to the lower second threshold, preventing material wastage while maintaining user convenience
3Device complexity
If single threshold system is used for cartridge replacement, then replacement timing is simple to determine, but print material wastage occurs due to premature replacement
Solution Approach 1:
The patent segments the single threshold into two distinct thresholds: a first threshold for user notification and a second (lower) threshold for replacement cartridge activation. This segmentation allows the system to provide early notification while preventing premature replacement, reducing material wastage without significantly increasing system complexity
Solution Approach 2:
The patent introduces a second threshold parameter with a lower value than the first threshold, creating a parameter hierarchy that controls replacement timing. This additional parameter change enables precise control over when replacement cartridges become active, preventing wastage while maintaining manageable system complexity
Data Source
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AI summary
In response to detecting that a remaining supply of print material of a first cartridge has reached a first threshold, a printing device transmits a request. In response to detecting that a second cartridge has replaced the first cartridge, the printing device determines whether the remaining supply had reached a second threshold and whether a token permitting usage of the second cartridge was received responsive to the request. In response to determining that the remaining supply had reached the second threshold and that the token was received, the printing device prints with print material from the second cartridge.