Image-Forming Development Drive Control for Toner Fogging
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Solution Overview
Problem
In cleaner-less image forming apparatuses, developer deterioration due to repeated sliding contact during non-image forming operations leads to toner fogging and defective images, particularly when the developer consumption is low relative to drive time.
Innovation Solution
An image forming apparatus with a control system that adjusts the frequency of development member driving based on developer amount and movement distance, switching to a lower frequency mode when necessary to prevent developer deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the development member is rotated during cleaning operation to clean the charging member, then the cleaning effectiveness is improved, but the developer deteriorates due to repeated sliding contact
Solution Approach 1:
The development member is rotated intermittently rather than continuously during cleaning operation. The rotation is performed periodically to achieve cleaning effectiveness while minimizing the total sliding contact time between developer and charging member surface, thereby reducing developer deterioration.
Solution Approach 2:
The rotation speed and duration of the development member are controlled as adjustable parameters. By optimizing these parameters, the system achieves sufficient cleaning effectiveness while limiting the cumulative sliding contact time that causes developer deterioration.
2Reliability
If the development member is driven frequently to maintain cleaning, then the cleaning performance is improved, but the developer deteriorates due to increased sliding contact
Solution Approach 1:
Instead of continuous rotation, the development member is rotated periodically at intervals. This periodic action maintains cleaning performance by removing accumulated toner from the charging member surface while significantly reducing the total time the development member rotates, thereby reducing developer deterioration.
Solution Approach 2:
The system monitors the cleaning state and developer condition, automatically determining when cleaning rotation is necessary. This self-regulating approach ensures cleaning is performed only when needed, avoiding unnecessary developer rotation and sliding contact.
3Productivity
If the development member rotates at high speed for efficient cleaning, then the cleaning efficiency is improved, but the developer deteriorates more rapidly
Solution Approach 1:
The development member rotates at high speed periodically rather than continuously. Each rotation cycle achieves efficient cleaning of the charging member surface, but the intermittent nature of the rotation limits the cumulative sliding contact time, thereby reducing developer deterioration despite the high rotation speed.
Solution Approach 2:
The system dynamically adjusts rotation speed and duration parameters. High speed rotation is used only when cleaning effectiveness is most needed, while the total rotation time is constrained to prevent excessive developer deterioration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses the occurrence of defective images by maintaining developer quality and reducing toner fogging, ensuring consistent image quality.
Implementation Method 1
a charging member which is rotatable and charges the image bearing member
Implementation Method 2
a development member which is rotatable and supplies a developer to a surface of the image bearing member
Implementation Method 3
the developer in a developing device is repeatedly brought into sliding contact
Data Source
AI summary
An image forming apparatus includes an image bearing member, a charging member, a development member, a developer accommodating portion, a first acquiring portion which acquires developer amount information related to an amount of the developer accommodated in the developer accommodating portion, a second acquiring portion which acquires development drive information related to a movement distance of a surface of the development member, and a control portion which is capable of executing a first mode and a second mode, whose frequency of driving the development member lower than that of the first mode, as an image forming mode. The control portion proposes or determines a change from the first mode to the second mode of the image forming mode on the basis of the developer amount information and the development drive information.