Laser Printer Developing Cartridge Activation Mechanism
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Solution Overview
Problem
The detection performance of existing developing cartridges for laser printers is unstable due to the vulnerability of the detection gear, which easily damages and affects the reliability of detecting whether the cartridge is new.
Innovation Solution
A developing cartridge with an activation mechanism comprising a diameter-changing wheel, a return spring, and a sliding block, where the diameter-changing wheel has two sections of arcs of different diameters, an elastic rubber ring, and a torsion spring, allowing for reliable detection without overloading any single component with multiple functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection gear is used to detect whether the developing cartridge is new, then the detection function is achieved, but the detection performance becomes unstable due to easy damage of the gear
Solution Approach 1:
The patent extracts the detection function from the stirring wheel by adding a separate detection gear that engages with the drive gear. This separate detection gear is driven by the rotation of the developing cartridge, and its position is detected by a sensor to determine whether the cartridge is new or used. By separating the detection function from the stirring function, the reliability of detection is improved while the stirring wheel's durability is preserved.
Solution Approach 2:
The patent introduces a detection gear as an intermediary component between the drive gear and the sensor. The detection gear translates the rotation of the developing cartridge into detectable positional changes without placing direct detection demands on the stirring wheel. This intermediary mechanism protects the stirring wheel from damage while enabling reliable detection of cartridge status.
2Device complexity
If multiple functions are assigned to single components, then device complexity is reduced, but component vulnerability increases leading to unstable detection
Solution Approach 1:
The patent segments the functions of the developing cartridge into distinct components: the stirring wheel for mixing toner, the drive gear for rotation, the detection gear for status detection, and the sensor for signal detection. Each component has a single dedicated function, which reduces vulnerability and improves reliability. The detection gear specifically engages with the drive gear to detect rotation without overloading any single component.
Solution Approach 2:
The drive gear serves multiple functions: it drives the stirring wheel for toner mixing and simultaneously drives the detection gear for status detection. This multi-functionality is achieved without compromising the durability of individual components, as the detection gear is specifically designed to engage with the drive gear's teeth without adding excessive load.
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
The solution provides reliable detection performance with reduced risk of damage, simplifying production and lowering costs by ensuring each component has a single function, thereby enhancing the stability and effectiveness of the detection mechanism.
Implementation Method 1
an end of the sliding block opposing the diameter-changing wheel is in a free hanging state, and the end of the sliding block close to the diameter-changing wheel is located in front of the protruding block which moves circularly following the diameter-changing wheel, and extends to a base portion where the protruding block is adjacent to the diameter-changing wheel in the axial direction of the diameter-changing wheel
Implementation Method 2
The return spring presses the sliding block in the sliding groove at one end close to the diameter-changing wheel
Data Source
Figure 1
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AI summary
The present invention discloses a developing cartridge for a laser printer, comprising a stirring wheel and an activation mechanism, the activation mechanism comprising a diameter-changing wheel, a return spring and a sliding block, wherein the diameter-changing wheel is parallel with an axial direction of the stirring wheel and includes two sections of arcs, a larger diameter arc of the two sections of arcs is meshed with the stirring wheel, a protruding block is provided on a lateral end wall at a side of the axial direction of the diameter-changing wheel facing the end cover, a part of the end cover corresponding to the diameter-changing wheel is provided as an inclined wall, the inclined wall is provided with a sliding groove, the sliding block is mounted in the sliding groove, the return spring presses the sliding block in the sliding groove at one end close to the diameter-changing wheel, and an end of the sliding block close to the diameter-changing wheel is located in front of the protruding block which moves circularly and extends to a base portion of the protruding block.