Toner Inlet Shutter Alignment for Detachable Development Units
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Solution Overview
Problem
The development device in existing image forming apparatuses is not installable or removable in the axial direction, making it difficult to smoothly supply toner from the pipe to the development device.
Innovation Solution
The development device is designed to be detachably attachable to the main housing in the axial direction, with a configuration that opposes the inlet of the development device to the pipe opening, and includes movable shutters to control toner supply and discharge, ensuring smooth toner flow and prevention of backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the development device is made detachable in the axial direction, then ease of operation is improved, but toner supply reliability deteriorates due to misalignment between pipe opening and inlet
Solution Approach 1:
The patent employs a movable shutter mechanism that dynamically adjusts the inlet position to match the pipe opening location. The shutter can rotate between different angular positions to align the inlet with the pipe opening when the development device is installed, ensuring reliable toner supply while maintaining detachability.
Solution Approach 2:
The patent changes the angular position parameter of the shutter to achieve proper alignment. By rotating the shutter to a specific angle, the inlet is positioned to face the pipe opening, ensuring that toner flow is not blocked during installation and removal operations.
2Productivity
If the inlet is always open, then toner supply speed is improved, but toner loss increases due to uncontrolled discharge
Solution Approach 1:
The shutter mechanism provides dynamic control over the inlet opening. It can rotate to open the inlet for toner supply, then close it to prevent uncontrolled discharge, and open again when discharge is needed. This dynamic opening and closing action allows the system to maintain high productivity during supply while preventing toner loss during non-operational states.
Solution Approach 2:
The shutter operation is controlled based on feedback signals from the controller that monitor the operational state of the development device. When the device is installed and ready, the shutter opens to supply toner. When the device is removed or not in use, the shutter closes to prevent toner loss. This feedback-based control ensures optimal balance between supply speed and loss prevention.
3Ease of operation
If the development device is detached, then ease of operation is improved, but toner circulation reliability deteriorates due to backflow
Solution Approach 1:
Before detaching the development device, the shutter is closed in advance to seal the inlet. This preliminary closing action prevents toner from flowing back into the pipe when the device is detached. The controller executes this sequence: first close the shutter, then allow detachment. This ensures that even when the device is removed, toner circulation reliability is maintained by preventing backflow.
4Productivity
If the inlet is positioned to face the pipe opening, then toner supply efficiency is improved, but device complexity increases due to shutter mechanism
Solution Approach 1:
Instead of using a complex adjustable inlet mechanism, the patent employs a relatively simple rotational shutter that can be actuated by a motor. The shutter rotates between a limited set of angular positions (open and closed states), which simplifies the mechanism compared to fully adjustable systems. This dynamic element provides the necessary flexibility for efficient toner supply while keeping the overall device complexity manageable.
Data Source
AI summary
An image forming apparatus includes a main housing, an intermediate transfer belt, a development device, a toner box, and a pipe. The development device includes a development housing having an inlet through which toner is received, and a development roller rotatable about a development axis. The development device is detachably attachable to the main housing. The toner box is detachably attachable to the main housing and contains toner therein. The pipe has a pipe opening through which toner is provided to the development device. The development device is positioned below the intermediate transfer belt. The toner box is positioned above the intermediate transfer belt. In a state where the development device is attached to the main housing, the inlet of the development housing is opposed to the pipe opening and is configured to receive toner delivered by the pipe.