Smoky Dust Prevention Sheet Backup Member Attachment
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Solution Overview
Problem
Conventional development apparatuses in electrophotographic image formation systems face issues with smoky dust prevention sheets detaching from regulation plates, leading to reduced durability and irregular image density due to insufficient adhesion and rigidity, causing powder developers to accumulate and form lumps.
Innovation Solution
The development apparatus incorporates a backup member to sandwich the smoky dust prevention sheet with the regulation plate, enhancing adhesion and rigidity, and a spacer member with increased thickness to eliminate the need for holes, ensuring uniform pressing force and preventing detachment, thereby maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the smoky dust prevention sheet is stuck on the regulation plate with a small sticking area, then the device complexity is reduced, but the reliability deteriorates because the sheet detaches when bent during use
Solution Approach 1:
The invention transitions from a two-dimensional sticking problem to a three-dimensional solution by introducing a backup member that extends in the thickness direction. This backup member provides additional attachment surface area and structural support, preventing sheet detachment while maintaining simple device complexity.
2Ease of manufacture
If a hole is provided in the smoky dust prevention sheet for the screw, then the ease of manufacture is improved, but the rigidity deteriorates making the sheet more easily detached
Solution Approach 1:
The backup member acts as an intermediary element between the smoky dust prevention sheet and the regulation plate. It provides a mounting surface for screws without requiring holes in the sheet itself, thus maintaining sheet rigidity while enabling easy assembly through the backup member.
3Reliability
If the sticking area of the smoky dust prevention sheet is increased, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The attachment system is segmented into three distinct components: the smoky dust prevention sheet, the backup member, and the regulation plate. This segmentation allows each component to have optimized attachment surfaces, increasing overall reliability without requiring the sheet itself to be overly complex.
4Ease of operation
If the smoky dust prevention sheet is used in contact with the development roller in a bent state, then the function of sealing the gap is achieved, but the sheet detaches due to insufficient adhesion
Solution Approach 1:
The backup member provides beforehand cushioning support to the smoky dust prevention sheet at its attachment point. This prevents detachment caused by bending stresses during operation, allowing the sheet to maintain its bent configuration for gap sealing while remaining securely attached.
Data Source
AI summary
A development apparatus has a casing, a regulation plate, a smoky dust prevention sheet and a backup member which are fixed together onto the casing with a screw. The backup member sandwiches a fixed end portion of the smoky dust prevention sheet with the regulation plate. Therefore, the backup member suppresses detachment of the smoky dust prevention sheet from the regulation plate. Thus, the smoky dust prevention sheet is prevented from being detached from the regulation plate when the smoky dust prevention sheet is used in contact with a development roller in the state of being bended.