Developing Cartridge Coil Spring Pressing Force Maintenance
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Solution Overview
Problem
The pressure applied by elastic members in developing cartridges for tandem-type image forming devices decreases over time, leading to a reduction in the pressing force against image carriers, resulting in inadequate toner supply and poor development of latent images.
Innovation Solution
The use of a coil spring or elastic member integrated into the developing cartridge ensures consistent pressure against the image carrier, maintaining optimal toner supply by compressing a spring guiding member to press the developer carrier against the image carrier, thereby ensuring reliable image development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an elastic member is used to press the developer carrier against the image carrier, then the developer carrier is pressed with sufficient force initially, but the pressing force decreases over time as the elastic member deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the pressing member movable rather than fixed. The pressing member can move in the pressing direction to maintain contact pressure on the developer carrier. This dynamic adjustment compensates for the deterioration of the elastic member, ensuring consistent pressing force throughout the service life of the developing cartridge.
2Ease of operation
If the developing cartridge structure is simplified for easy installation, then the cartridge can be easily installed and removed, but the mechanism to maintain consistent pressing force becomes insufficient
Solution Approach 1:
The patent merges the pressing member with the developing cartridge structure, integrating the pressing function into the cartridge itself. This combination maintains reliability by ensuring the pressing member remains part of the removable cartridge assembly, while the overall structure stays simple enough for easy installation and removal as a complete unit.
3Force
If the elastic member is made stronger to maintain pressing force, then the pressing force remains sufficient longer, but the structure becomes more complex and the member may cause damage upon deterioration
Solution Approach 1:
The patent applies the disposable principle by designing the pressing member as part of the removable developing cartridge. When the elastic member deteriorates or loses effectiveness, the entire cartridge is replaced rather than repairing or adjusting individual components. This approach avoids the complexity of sophisticated adjustment mechanisms while ensuring consistent performance throughout the cartridge's service life.
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 a consistent and appropriate pressure on the developer carrier, ensuring effective toner transfer and image formation, even as the cartridge's weight changes due to toner depletion, thus improving image quality and simplifying maintenance.
Implementation Method 1
An elastic member such as a spring is provided on the main body of the image forming device. Under the condition in which the developing cartridge is installed on the main body, a pressure is provided to the developing cartridge having an elastic member so that the developer carrier is pressed against the image carrier with the designated pressing force.
Data Source
AI summary
A developing cartridge that maintains a pressing condition to press a developer carrier against the image carrier is described. The developing cartridge may include a coil spring that presses the developer carrier against the image carrier. The coil spring may include a handle that transmits a pressing force to the coil spring via the contacting member. By doing so, every time the developing cartridge is replaced, a new coil spring and handle can be provided for the color laser printer with the developing cartridge attached. Therefore, a constant pressure by the coil spring can be continuously maintained. Thus, a preferable pressure condition of the developer carrier against the image carrier can be continuously maintained.