Developing Roller Gear Switching for Consistent Rotation
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Solution Overview
Problem
Existing image forming apparatuses cannot rotate the developing roller in the same direction when the coupling is rotated clockwise or counterclockwise, and toner supply is not efficiently managed by the coupling operation.
Innovation Solution
A developing device with a coupling gear and a moving gear that rotates the developing roller in the same direction regardless of the coupling's rotation direction, and includes a clutch mechanism to ensure efficient toner supply by rotating the first gear clockwise and the developing roller counterclockwise, with a separate toner accommodation chamber for timed toner delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the coupling is rotated to drive the developing roller, then the developing roller rotates, but the developing roller cannot rotate in the same direction when the coupling is rotated clockwise or counterclockwise
Solution Approach 1:
The moving gear is designed to dynamically change its meshing position with the first gear based on the rotation direction of the coupling gear. When the coupling gear rotates in different directions, the moving gear automatically shifts between first and second positions, selecting different meshing partners (first gear or second gear) to ensure the developing roller always rotates in the same direction.
Solution Approach 2:
The moving gear acts as an intermediary element between the coupling gear and the developing roller. It receives rotational input from the coupling gear and conditionally transmits it to the first gear or second gear, thereby mediating the direction conversion to achieve consistent developing roller rotation regardless of coupling rotation direction.
2Productivity
If additional components like levers and solenoids are added to supply toner, then toner can be supplied, but the device complexity increases
Solution Approach 1:
The coupling gear is designed to perform multiple functions: it not only drives the developing roller through the gear mechanism but also directly supplies toner by rotating the first gear when in mesh with it. This multi-functionality eliminates the need for separate toner supply mechanisms like levers and solenoids, reducing device complexity while maintaining productivity.
Solution Approach 2:
The toner supply function is merged with the driving function of the coupling gear. When the coupling gear rotates and meshes with the first gear, it simultaneously performs both the driving action and the toner supply action, combining two functions into a single component operation.
Data Source
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AI summary
A developing device 10 includes an auger or an agitator that is capable of supplying toner in a toner accommodation chamber to a developing chamber and is rotatable about an auger axis extending in an axial direction, a transporting gear 26 that is rotatable together with the auger or the agitator, and a moving gear 33 that is in mesh with a coupling gear 22B and is rotatable both counterclockwise and clockwise. The moving gear 33 is movable while being in mesh with the coupling gear 22B between a first position where the moving gear 33 is in mesh with the transporting gear 26 and a second position where the moving gear 33 is out of mesh with the transporting gear 26. The moving gear 33 moves to the first position when the coupling gear 22B rotates counterclockwise and to the second position when the coupling gear 22B rotates clockwise.