Developing Cartridge Urging Mechanism for Toner Supply Consistency
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Solution Overview
Problem
The elasticity of the elastic member in tandem image forming apparatuses deteriorates over time, leading to a decrease in the pressing force of the developing roller against the image carrier, resulting in toner supply shortages and potential development failures.
Innovation Solution
The development of a developing cartridge with an urging mechanism that includes a pair of elastic mechanisms and a pressing member, which compresses a coil spring to maintain consistent pressure on the developing roller against the image carrier, ensuring continuous and proper toner supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic member is used to press the developing roller against the image carrier, then the developing roller can be pressed against the image carrier at appropriate pressure, but the elasticity of the elastic member gradually decreases as it deteriorates, leading to toner supply shortage
Solution Approach 1:
The patent makes the urging mechanism including the elastic member replaceable with the developing cartridge. Although the elastic member has limited service life and deteriorates over time, it can be replaced together with the developing cartridge, ensuring consistent toner supply without requiring separate maintenance of the elastic member. This resolves the contradiction by accepting the limited lifespan of the elastic member in exchange for reliable toner supply during its service period.
2Force
If the developing roller is pressed against the image carrier with sufficient force, then proper toner transfer is achieved, but the elastic member deteriorates and loses elasticity over time, reducing pressing force
Solution Approach 1:
The patent enables dynamic replacement of the urging mechanism with the developing cartridge. When the elastic member deteriorates and can no longer provide sufficient pressing force, the entire developing cartridge including the urging mechanism can be replaced. This dynamic approach ensures consistent pressing force throughout the service life of the image carrier cartridge, resolving the contradiction between initial pressing force and long-term consistency.
3Force
If a separate urging mechanism is provided in the housing to press the developing roller, then the developing roller can be pressed against the image carrier, but the structure becomes more complex and maintenance becomes difficult
Solution Approach 1:
The patent combines the urging mechanism with the developing cartridge as an integrated assembly. The elastic member, pressing member, and developing roller are all part of the replaceable developing cartridge unit. This merging eliminates the need for separate urging mechanisms in the housing, simplifying the overall structure while maintaining the necessary pressing force function.
Solution Approach 2:
The developing cartridge with integrated urging mechanism serves itself by being replaced as a complete unit when the elastic member deteriorates. The user replaces the entire developing cartridge rather than servicing individual components, making maintenance simple and eliminating complex housing structures for separate urging mechanisms.
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 solution maintains the necessary pressure on the developing roller, preventing toner supply shortages and ensuring consistent image formation by replacing the urging mechanism when specifications change, thus extending the life of the cartridge and maintaining image quality.
Implementation Method 1
an urging mechanism including a pair of elastic mechanisms 121 and a pressing member 123. The pressing member 123 presses the elastic mechanisms 121 between the gear positioning portion 78 and the protrusion 143
Data Source
AI summary
An image forming apparatus includes a housing, an image carrier unit configured to move along a first direction between a first position and a second position in the housing and to hold image carriers, developing cartridges configured to be removably mounted in the image carrier unit, and an exposure unit disposed in the housing and for generating light to irradiate each image carrier. Each developing cartridge includes a developer carrier for supplying developer to the image carrier, a case configured to contain the developer and having a support portion for supporting the developer carrier at a first side of the case and a pair of sidewalls facing each other in a second direction perpendicular to the first direction, and an urging mechanism disposed at a second side of the case opposite to the first side for contacting the exposure unit when the image carrier unit is in the first position.