Process Cartridge Force Receiving Portion for Image Quality
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Solution Overview
Problem
The contact developing method in image forming apparatuses faces issues with defective images due to deformation of the elastic layer on the developing roller, and existing solutions for separation mechanisms can affect operability and space efficiency.
Innovation Solution
A process cartridge with a developing frame member that can assume both abutting and separating states, featuring a force receiving portion with a first portion extending along the insertion direction and second portions on either side, allowing for uniform pressing and efficient separation, thereby improving operability and space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the developing roller is kept pressed against the photosensitive drum to maintain predetermined abutting pressure, then development can be performed, but the elastic layer on the surface of the developing roller undergoes deformation resulting in a defective image
Solution Approach 1:
The patent applies the dynamics principle by enabling the developing roller to switch between two states: pressed against the photosensitive drum during image formation and separated during non-image-formation periods. This dynamic state change allows the system to maintain reliable image quality when needed while preventing elastic layer deformation during storage, resolving the contradiction between image quality reliability and structural stability.
2Stability of the object's composition
If a separation member is provided to separate the developing roller from the photosensitive drum during non-image-formation period, then elastic layer deformation is prevented, but the structure becomes more complex and space-consuming
Solution Approach 1:
The patent merges the separation function with the existing developing frame member structure. The developing frame member is designed to be movable between positions that allow it to support the developing roller in contact with the photosensitive drum and positions that separate them. This integration eliminates the need for separate, complex separation mechanisms while achieving the same protective function against elastic layer deformation.
3Ease of operation
If guide members are provided to guide the process cartridge during attachment, then attachment operability is improved, but the space required inside the image forming apparatus main body increases
Solution Approach 1:
The patent applies the dimensionality change principle by designing guide members that extend in the attachment direction (longitudinal dimension) rather than perpendicular to it. The guide members are configured to guide the process cartridge along its insertion path, providing operational guidance while minimizing the lateral space occupation. This allows improved attachment operability without significantly increasing the internal volume of the apparatus.
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
Enhances operability during attachment and detachment of the process cartridge while achieving space savings in the image forming apparatus, reducing the overall size of both the cartridge and the apparatus.
Implementation Method 1
the elastic layer on the surface of the developing roller undergoes deformation
Implementation Method 2
the developing roller is kept pressed against the photosensitive drum so that the developing roller and the photosensitive drum maintain a predetermined abutting pressure
Implementation Method 3
a force receiving portion provided on the developing frame member and configured to allow the developing frame member to enter the separating state by being pressed by a pressing portion provided in the image forming apparatus main body
Data Source
AI summary
A process cartridge detachable from an image forming apparatus main body which includes an image bearing member, a developer bearing member, a developing frame member to support the developer bearing member and is able to assume an abutting state and a separating state, a force receiving portion configured to allow the developing frame member to enter the separating state by being pressed by a pressing portion where the force receiving portion includes a first portion to abut on the pressing portion and to extend along the inserting direction of the process cartridge, and a second portion provided on each of an upstream and downstream side of the first portion in the inserting direction.