Developing Unit Housing Rigidity via Segmented Support
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Solution Overview
Problem
The existing developing units in image forming apparatuses face issues with deformation due to heat and pressure, leading to waste toner flowback, air leaks, and interference with neighboring units, which complicates attachment and detachment, especially in color image forming systems, and increases the unit's volume when trying to mitigate these issues.
Innovation Solution
The developing unit incorporates support projections and receivers with cruciform shapes and inclined support ribs to enhance structural rigidity, preventing deformation by thermally bonding upper and lower housings and maintaining the integrity of the waste toner housing, even under heat and pressure, thus ensuring stable operation and reduced volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the upper housing is formed in a thin plate shape to reduce volume, then the volume of the developing unit is reduced, but the housing deforms under heat and pressure causing waste toner flowback
Solution Approach 1:
The housing is divided into an upper housing and a lower housing as separate components. The upper housing can be formed as a thin plate shape for volume reduction, while the lower housing provides structural support. The segmentation allows each part to have optimized characteristics - the upper housing minimizes volume while the lower housing prevents deformation through its connection to the support unit.
Solution Approach 2:
The developing unit employs a composite structure combining the upper housing (thin plate material for volume reduction) with the lower housing and support unit (rigid material for structural stability). This composite approach allows the system to achieve both volume reduction and deformation prevention by strategically assigning different material properties to different components.
2Stability of the object's composition
If support units are added to prevent deformation, then structural stability is improved, but the device complexity increases
Solution Approach 1:
The support unit is merged with the lower housing to form an integrated structural component. Rather than adding separate support elements, the support function is combined with the housing structure itself, reducing the number of discrete parts while maintaining structural stability.
Solution Approach 2:
The lower housing serves multiple functions: it provides the structural base for the developing unit, houses the support unit to prevent deformation, and interfaces with the upper housing. This multi-functionality reduces the need for additional dedicated support components, thereby limiting the increase in device complexity.
3Stability of the object's composition
If space is increased between toner housing and waste toner housing to prevent deformation, then structural stability is improved, but the volume of the developing unit increases
Solution Approach 1:
Instead of increasing horizontal space between the toner housing and waste toner housing, the support structure extends vertically from the lower housing to the upper housing. This dimensional change allows structural reinforcement without increasing the lateral footprint or overall volume of the developing unit.
Data Source
AI summary
A developing unit includes a waste toner housing (100) having an upper housing (110) and a lower housing (120) which face each other, at least one support unit (200) to allow connection between the upper and lower housings, and to support facing surfaces of the upper and lower housings, and a toner housing which is disposed on a lower part of the waste toner housing and is spaced apart from the waste toner housing at a predetermined distance. Accordingly, the waste toner housing is prevented from being deformed by heat and pressure, and thus white lines on images, flowback of waste toner and insufficient cleaning, which are caused by interference with the light path due to deformation of the waste toner housing, can be reduced. Additionally, tolerance can be greatly reduced as a result of resolving the problem of deformation of the waste toner housing, so a developing unit having a smaller size can be provided.