Cover Closure Mechanism Prevents Unexpected Opening
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Solution Overview
Problem
Conventional image forming apparatuses face issues where external forces can unexpectedly open the front cover due to the release of the hook member engagement with the casing protrusion, and increasing engagement allowance makes it difficult for users to open the cover for maintenance.
Innovation Solution
The image forming apparatus incorporates a second closing position holding mechanism with engaging protrusions on the top cover and grooves on the front cover, allowing secure engagement and release to prevent unexpected opening while maintaining easy operability for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engagement allowance between the hook member and protrusion is increased to prevent unexpected opening, then the reliability of cover closure is improved, but the ease of operation for maintenance work deteriorates
Solution Approach 1:
The closing position holding mechanism is divided into two independent engagement systems: a first engagement between the hook member and casing protrusion, and a second engagement between the engaging part and engaged part. This segmentation allows each engagement to be optimized independently - the first for reliability and the second for ease of operation.
Solution Approach 2:
The engaging part and engaged part act as intermediary elements that mediate between the need for secure closure and easy opening. The engaged part on the lateral cover interfaces with the engaging part on the casing, providing an intermediate engagement point that facilitates controlled opening while maintaining secure closure.
2Stability of the object's composition
If the hook member engagement is made firm to prevent unexpected opening, then the stability of cover position is improved, but the device complexity increases
Solution Approach 1:
The first closing position holding mechanism (hook member and protrusion) and the second closing position holding mechanism (engaging part and engaged part) are merged into a unified system. This combination allows the mechanisms to work together synergistically, where the second mechanism simplifies the opening operation while the first mechanism maintains position stability, thereby reducing overall complexity compared to using a single complex mechanism.
Data Source
AI summary
An image forming apparatus includes a casing, an upper cover, a lateral cover and a closing position holding mechanism which holds the lateral cover in a closing position. The closing position holding mechanism includes an engaging part provided in the upper cover and an engaged part provided in the lateral cover. When the upper cover is displaced from the opening position to the closing position in the state where the lateral cover is in the closing position, the engaging part is engaged with the engaged part from an outside on the lateral side of the casing. When the upper cover is displaced from the closing position to the opening position in the state where the lateral cover is in the closing position, the engagement of the engaging part with the engaged part is released as the upper cover is displaced.