Controller Logic for Image Forming Apparatus Developer Management
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Solution Overview
Problem
The existing image forming apparatuses can unintentionally execute the use-up mode, leading to a risk of image quality deterioration and malfunction due to erroneous user settings, causing the apparatus to use up the developer prematurely.
Innovation Solution
An image forming apparatus with a controller that executes a first printing process when the developer cartridge is mounted and a second printing process when the cartridge is not mounted, using a usage amount index to determine when to switch to using the developer remaining in the developing unit, and prohibiting the second process if the usage amount is below a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the use-up mode is executed with the developer cartridge kept mounted on the image forming unit, then the developer can be used up completely, but erroneous execution may occur against user's intention causing image quality deterioration and malfunction
Solution Approach 1:
The controller checks whether the developer cartridge is mounted before executing the use-up mode. This preliminary check prevents erroneous execution by ensuring the correct operational context is established before initiating the developer depletion process, thereby maintaining reliability while enabling complete developer usage.
2Productivity
If the controller allows automatic execution of the second printing process, then productivity is improved, but image quality may deteriorate due to premature developer exhaustion
Solution Approach 1:
The controller monitors the usage amount of the developing unit and compares it against a predetermined threshold value. This feedback mechanism ensures that the second printing process is only executed when appropriate, preventing premature developer exhaustion while maintaining high printing efficiency through automated control.
3Ease of operation
If the controller executes the second printing process without checking usage amount, then ease of operation is improved, but the developing unit may malfunction due to excessive usage
Solution Approach 1:
The controller automatically monitors the usage amount of the developing unit and autonomously determines whether to execute the second printing process based on the predetermined threshold. This self-service approach maintains operational simplicity for the user while ensuring the developing unit operates within safe parameters, preventing malfunction.
Data Source
AI summary
An image forming apparatus, including: a housing; a photoconductor; a developing unit configured to form a developer image on the photoconductor; a developer cartridge storing developer, the cartridge being removably mountable on the housing, a supplier configured to supply the developer from the developer cartridge to the developing unit; and a controller configured to execute a first printing process of forming a developer image by use of the developer supplied from the developer cartridge, when the developer cartridge is being mounted on the housing, and a second printing process of forming a developer image by use of the developer remaining in the developing unit, when a usage amount of the developing unit is not less than a predetermined value and the developer cartridge is not being mounted on the housing, wherein the controller does not execute the second printing process when the usage amount is less than the predetermined value.