Developing Roller Coupling for Bidirectional Toner Supply Timing
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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 limited to only one direction, necessitating a device that can rotate the developing roller in both directions and supply toner with precise timing using the coupling operation.
Innovation Solution
A developing device with a coupling that allows the developing roller to rotate in the same direction regardless of the coupling's rotation direction, and a mechanism for toner supply from the toner accommodation chamber to the developing chamber using a gear system and clutch mechanism controlled by a controller, enabling toner supply with required timing by rotating the coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the coupling is rotated clockwise or counterclockwise to drive the developing roller, then the developing roller can be rotated, but the developing roller rotates in different directions depending on the coupling rotation direction
Solution Approach 1:
A direction conversion mechanism (gear system or belt drive) is introduced as an intermediary between the coupling and the developing roller. This intermediary converts the bidirectional rotation of the coupling into unidirectional rotation of the developing roller, resolving the contradiction between operational flexibility and directional consistency.
Solution Approach 2:
Instead of directly transmitting rotation from the coupling to the developing roller, the system inverts the transmission logic by using a mechanism that converts opposite rotational inputs into the same rotational output direction, ensuring consistent developing roller rotation regardless of coupling rotation direction.
2Stability of the object's composition
If additional components like levers are added to enable bidirectional coupling rotation, then the developing roller can be rotated in the same direction, but the device complexity increases
Solution Approach 1:
The coupling mechanism is designed to perform multiple functions: it transmits rotational force to the developing roller while simultaneously controlling toner supply timing. This multi-functionality eliminates the need for separate levers or additional components, reducing device complexity while maintaining rotation direction consistency.
Solution Approach 2:
The functions of the coupling and the toner supply control mechanism are merged into a single integrated system. The coupling's rotation directly controls both the developing roller rotation and the toner supply timing, eliminating the need for separate control components and simplifying the overall device structure.
3Loss of time
If the coupling operation is used to supply toner with required timing, then the toner supply timing is precise, but the mechanism for toner supply becomes more complex
Solution Approach 1:
The coupling mechanism serves itself by using its own rotation to control both the developing roller and the toner supply timing. The system leverages the existing coupling rotation to automatically trigger toner supply at the required timing without needing separate control mechanisms, achieving precise timing while avoiding increased complexity.
Data Source
AI summary
A developing device may include 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 that is rotatable together with the auger or the agitator, and a moving gear that is in mesh with a coupling gear and is rotatable both counterclockwise and clockwise. The moving gear is movable while being in mesh with the coupling gear between a first position where the moving gear is in mesh with the transporting gear and a second position where the moving gear is out of mesh with the transporting gear. The moving gear moves to the first position when the coupling gear rotates counterclockwise and to the second position when the coupling gear rotates clockwise.