Developing Cartridge Gear Disengagement for Reliable Stopping
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Solution Overview
Problem
Existing developing cartridges rely on a teeth lacking gear mechanism to stop protrusion movement, which is not a preferred solution.
Innovation Solution
A developing cartridge design that uses a first gear and a second gear with a protrusion, where the first gear moves away from the second gear to disengage, stopping the rotation and movement of the protrusion without a teeth lacking portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a teeth lacking portion is provided in the gear to stop rotation, then the movement of the protrusion can be stopped, but the gear structure becomes more complex and manufacturing becomes more difficult
Solution Approach 1:
The gear system is divided into two separate gears (first gear and second gear) where the stopping function is achieved through the relative movement and disengagement of the first gear from the second gear, rather than modifying a single gear with a teeth lacking portion. This segmentation simplifies the individual gear structures while maintaining the stopping function.
Solution Approach 2:
Instead of creating a teeth lacking portion in the driving gear to stop rotation, the invention inverts the approach by using the disengagement of the driving gear (first gear) from the driven gear (second gear) to achieve the stopping function. The first gear moves away from the second gear in the axial direction, which is the opposite of the conventional approach of removing teeth from the same gear.
2Reliability
If a teeth lacking portion is provided in the gear, then the protrusion movement can be stopped, but the manufacturing precision requirements increase
Solution Approach 1:
By separating the gear into two distinct gears (first gear with protrusion and second gear as driven gear), the manufacturing precision requirements for each individual gear are reduced. Each gear can be manufactured with standard tooth profiles without requiring precise alignment of teeth lacking portions, thereby reducing overall manufacturing precision demands while maintaining the stopping function.
3Ease of operation
If the first gear is made movable in the axial direction, then the engagement and disengagement can be achieved, but the device complexity increases
Solution Approach 1:
The stopping function is merged with the existing engagement mechanism by utilizing the axial movement capability of the first gear. The same mechanical structure that enables engagement (axial movement of first gear) is also used to achieve disengagement and stopping, eliminating the need for separate stopping mechanisms and reducing overall device complexity.
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 design effectively stops the rotation of the second gear and movement of the protrusion without employing a teeth lacking portion, ensuring reliable operation and improved cartridge detection by the image forming apparatus.
Implementation Method 1
The second gear is configured to engage with the first gear and rotatable about a second axis extending in the predetermined direction
Data Source
AI summary
A developing cartridge includes a first gear, a second gear, and a protrusion. The first gear is rotatable about a first axis extending in a predetermined direction. The second gear is configured to engage with the first gear and rotatable about a second axis extending in the predetermined direction. The protrusion extends in the predetermined direction and circularly movable together with rotation of the second gear. The first gear is movable in a direction away from the second gear from a first position to engage with the second gear to a second position to disengage from the second gear.