Process Cartridge Housing with Arc-Shaped Bottom Portions
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Solution Overview
Problem
Existing process cartridges for electrophotographic image forming apparatuses have limitations in terms of size, cost, precision, usability, and service life, particularly in the volume of space containing toner.
Innovation Solution
The process cartridge includes a photosensitive member unit with a photosensitive drum and a developing unit that is attachable and detachable, featuring a housing with arc-shaped bottom portions and a pressing receiving portion located within a space surrounded by these bottom portions and a tangent line to their outer walls, allowing for increased toner volume without increasing the cartridge size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cartridge size is increased to accommodate more toner, then the toner volume increases, but the cartridge becomes larger and less compact
Solution Approach 1:
The pressing receiving portion is nested within the space surrounded by the arc-shaped bottom portions of the housing, allowing the pressing mechanism to be integrated into the existing structure without requiring additional external space. This enables increased toner volume while maintaining compact cartridge dimensions.
Solution Approach 2:
The housing utilizes arc-shaped bottom portions that project toward the outer side of the holding space, creating a three-dimensional configuration that efficiently utilizes available space. The pressing receiving portion is positioned in the space surrounded by these arc-shaped structures, optimizing spatial arrangement to accommodate more toner without increasing overall cartridge footprint.
2Ease of manufacture
If the housing structure is simplified to reduce cost, then manufacturing cost decreases, but precision and service life may be compromised
Solution Approach 1:
The housing is divided into distinct functional portions: arc-shaped bottom portions that support the pressing mechanism, a holding space for toner, and a pressing receiving portion. This segmentation allows each component to be optimized independently for both manufacturing ease and functional precision, reducing overall manufacturing complexity while maintaining required precision.
Solution Approach 2:
The arc-shaped bottom portions serve multiple functions: they provide structural support, define the holding space boundaries, and create the space for the pressing receiving portion. This multi-functionality reduces the number of separate components needed, simplifying manufacturing while maintaining structural precision and durability.
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 configuration enables an increase in the volume of the toner space within the process cartridge, enhancing its service life and usability while maintaining a compact size.
Implementation Method 1
a pressing member that presses the developing unit toward the photosensitive member unit
Implementation Method 2
a developing roller that supplies toner to the photosensitive drum
Implementation Method 3
a photosensitive drum on which an electrostatic latent image is formed
Data Source
AI summary
A developing unit, which is attachable to and detachable from a photosensitive member unit, includes: a developing roller; a housing in which a holding space that holds toner is formed; and a pressing receiving portion that receives pressing force from a pressing member. The housing includes a first bottom portion that projects toward an outer side of the holding space, and a second bottom portion that projects toward the outer side of the holding space, in a state in use. When viewed in a direction of a rotation axis of the developing roller, at least part of the pressing receiving portion is located in a space surrounded by the first bottom portion, the second bottom portion, and a tangent line tangent to both an outer wall of the first bottom portion and an outer wall of the second bottom portion.