Cover Interlock Mechanism for Toner Leakage Prevention
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Solution Overview
Problem
Existing image forming apparatuses face challenges in preventing toner leakage during transportation and maintenance, requiring cumbersome operations to attach and detach closing members, which can lead to toner scattering and leakage issues.
Innovation Solution
The apparatus incorporates a main interlocking mechanism and a cover state detection mechanism, utilizing a temporarily fitting member to release or enable the interlock between the cover portion and shutter output portions, allowing for secure toner container closure without special operations, and an object sensor to control print processes based on cover portion status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanism is provided to automatically close the shutter when the cover portion is opened, then toner leakage is prevented during replacement operations, but the device complexity increases due to additional interlocking mechanisms
Solution Approach 1:
The patent combines the cover opening/closing operation with the shutter closing/opening operation through a mechanical interlocking mechanism. The drive output portion is coupled to both the cover portion and the shutter, so that when the cover is opened, the shutter automatically closes without requiring a separate control mechanism. This merging of functions reduces the need for additional sensors and control circuits while ensuring reliable toner containment.
Solution Approach 2:
The interlocking mechanism is designed to close the shutter before the cover is fully opened during the replacement operation. By performing the shutter closing action in advance as part of the cover opening sequence, the system ensures that toner cannot leak out before the user has full access to replace the toner container, thereby preventing leakage proactively.
2Productivity
If the shutter is opened automatically when the cover portion is closed, then toner supply is ensured for printing operations, but toner may scatter during cover closing operations
Solution Approach 1:
The interlocking mechanism opens the shutter in advance during the cover closing operation, before the cover is fully sealed. This preliminary action ensures that the toner supply path is clear and ready for printing operations, while the controlled timing prevents premature opening that could cause scattering. The shutter is positioned to open only when the cover is sufficiently closed to contain any potential toner release.
3Reliability
If additional sensors are added to detect the interlock state between cover portion and shutter output portions, then print process control is improved, but device complexity and cost increase
Solution Approach 1:
The mechanical interlocking mechanism itself serves as the detection system. The drive output portion's position, which reflects the interlock state between the cover and shutter, is detected by existing sensors without requiring additional dedicated sensors. The system uses the mechanical coupling between components to provide state information that would otherwise require separate sensing elements, thereby avoiding increased complexity and cost.
4Extent of automation
If the shutter mechanism is coupled to move with the cover portion, then automatic toner container closure is achieved, but the ease of operation decreases due to restricted cover movement
Solution Approach 1:
The drive output portion is mechanically coupled to both the cover portion and the shutter in such a way that a single user action (opening or closing the cover) simultaneously controls both components. This merging eliminates the need for separate operations to control the shutter, automating the process while maintaining simple user interaction through the familiar cover opening/closing motion.
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 solution effectively prevents toner leakage during transportation and maintenance by automatically closing toner containers without additional sensors, ensuring secure closure and preventing unauthorized print processes when the cover is open.
Implementation Method 1
The return elastic member is configured to apply an elastic force to the second displacement member to hold the second displacement member at the standard position
Data Source
AI summary
A control device permits execution of a print process on condition that an object sensor detects an object at a detection position. A switch mechanism, in accordance with a release operation, releases an interlock between a first displacement member and a closing operation of a cover portion. In a state where a second displacement member is located at an actuation position, a detected portion is located at the detection position. When the second displacement member is located at a retreat position, a first contact portion is not in contact with the cover portion. When the cover portion is closed, the cover portion displaces the second displacement member from a standard position to an actuation position. When the first displacement member is displaced from a first relay position to a second relay position, the first displacement member displaces the second displacement member from the standard position to the retreat position.