Toner Supply Shutter Locking Mechanism for Leakage Prevention
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Solution Overview
Problem
Conventional toner containers in image forming apparatuses face issues with inadvertently opening the shutter during detachment, leading to toner leakage due to the lack of a stopper to maintain the closed state.
Innovation Solution
A toner supplying device with a guiding portion and an opening/closing structure featuring a shutter plate and elastic arms with locking claws, which ensures proper closing and opening operations during attachment and detachment, preventing accidental opening by engaging and disengaging locking claws with corresponding portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the container side engageable portion is in the form of a step (not a groove), then the shutter plate can move relative to the container body during attachment, but the shutter plate may inadvertently open during detachment causing toner leakage
Solution Approach 1:
The patent transforms the static engageable portion into a dynamic system with two distinct states: the first engageable portion (groove) allows the shutter plate to move relative to the container body during attachment, while the second engageable portion (step) maintains the shutter plate in a fixed closed position during detachment. This dynamic switching between movement and fixation states resolves the contradiction between ease of operation and reliability.
Solution Approach 2:
The engageable portion is segmented into two distinct functional regions: the first engageable portion in groove form that permits shutter plate movement, and the second engageable portion in step form that prevents movement. This segmentation allows different operational requirements to be met at different stages of the attachment/detachment process, solving the contradiction between needing movement during attachment and stability during detachment.
2Ease of operation
If the container side engageable portion allows free movement in one direction, then attachment is easy, but the shutter plate cannot be held in closed state after detachment
Solution Approach 1:
The patent merges the functions of movement allowance and position maintenance into a single integrated engageable portion structure. The groove-shaped first engageable portion and step-shaped second engageable portion are combined in one component, allowing the structure to both facilitate easy attachment and maintain the closed state without requiring separate mechanisms, thus avoiding increased device complexity.
3Reliability
If the shutter plate is held firmly in closed state, then toner leakage is prevented, but the shutter plate cannot open properly during attachment
Solution Approach 1:
The patent creates a dynamic engagement system where the locking strength varies based on the operational phase. During attachment, the first engageable portion allows the shutter plate to move freely. During detachment, the second engageable portion provides strong locking to prevent toner leakage. This dynamic adjustment of constraint level resolves the contradiction between firm holding and easy opening.
Solution Approach 2:
The engageable portion acts as an intermediary mechanism that mediates between the shutter plate and container body. It provides different levels of engagement at different times: allowing movement when opening is needed and providing firm locking when prevention is needed. This intermediary function resolves the contradiction by introducing a controlled, phase-dependent interaction between the shutter plate and container.
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
Effectively prevents toner leakage by ensuring the shutter remains closed during detachment and opens properly during attachment, enhancing the reliability of toner replenishment operations.
Implementation Method 1
an elastic arm extending in a sliding direction from one edge portion of the shutter plate and a container locking claw and a developing-device locking claw formed at the leading end of the elastic arm
Data Source
AI summary
A toner supplying device is provided with a container body formed with a toner replenishment opening and adapted to contain toner, a shutter for opening and closing the toner replenishment opening, and an opening/closing structure for causing the shutter to perform opening and closing operations as the container body is mounted into and detached from the apparatus body. The opening/closing structure includes an arm projecting from the shutter in a mounting direction of the container body into the apparatus body and a locking portion attached to the arm. The locking portion includes a first locking claw engageable with and disengageable from a first engageable portion for locking formed at the guiding portion and a second locking claw engageable with and disengageable from a second engageable portion for locking formed at the container body.