Developing Cartridge Gear Train for Low-Friction Toner Supply
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Solution Overview
Problem
The high rotational speed of the supply roller in developing cartridges leads to increased friction with toner, causing premature deterioration.
Innovation Solution
A developing cartridge design featuring a large-diameter gear and a small-diameter gear with a gear ratio that decelerates the supply roller, reducing its rotational speed to match the developing roller's speed, and an idle gear to further reduce frictional force, thereby minimizing toner deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the supply roller rotates at a high speed to supply toner to the developing roller, then the toner supply efficiency is improved, but the friction between the supply roller and toner increases causing premature toner deterioration
Solution Approach 1:
The patent introduces a supply roller that acts as an intermediary between the toner reservoir and the developing roller. This supply roller rotates in the same direction as the developing roller at a lower speed, reducing direct friction with toner while still effectively supplying toner through controlled contact and rotation, thus resolving the contradiction between supply efficiency and toner durability
2Quantity of substance
If the supply roller rotates faster than the developing roller to ensure adequate toner supply, then the toner supply adequacy is improved, but the frictional force between the supply roller and toner increases causing toner deterioration
Solution Approach 1:
The patent changes the rotational speed parameter of the supply roller, making it rotate at a lower speed than the developing roller. This parameter change reduces the relative motion and frictional force between the supply roller and toner, thereby preventing toner deterioration while maintaining adequate toner supply through the gear-driven mechanism
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 design effectively suppresses toner deterioration by reducing frictional forces between the supply roller and toner, ensuring longer toner life and improved cartridge performance.
Implementation Method 1
a large-diameter gear rotatable about the third axis together with the coupling and configured to mesh with the developing roller gear; a small-diameter gear rotatable about the third axis together with the coupling, having a diameter smaller than a diameter of the large-diameter gear
Implementation Method 2
friction between an outer surface of the supply roller and toner accommodated in a housing increases
Data Source
AI summary
A developing cartridge including: a housing capable of accommodating therein toner; a developing roller rotatable about a first axis extending in an axial direction; a supply roller rotatable about a second axis extending in the axial direction; a coupling rotatable about a third axis extending in the axial direction; a developing roller gear rotatable about the first axis together with the developing roller; a supply roller gear rotatable about the second axis together with the supply roller; a large-diameter gear rotatable about the third axis together with the coupling and meshing with the developing roller gear; a small-diameter gear rotatable about the third axis together with the coupling and having a diameter smaller than a diameter of the large-diameter gear, and an idle gear rotatable about a fourth axis extending in the axial direction and meshing with the supply roller gear and the small-diameter gear.