Cover Locking Device with Link Member and Restraint Part
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Solution Overview
Problem
Existing image forming apparatuses face challenges in securely locking and unlocking developer accommodating units to prevent unnecessary detachment and waste, particularly when the remaining developer amount reaches a threshold, as existing mechanisms are prone to unlocking due to impacts or improper locking mechanisms.
Innovation Solution
A cover locking device comprising a restriction member, an urging member, a solenoid, a link member, and a restraint part, which allows for controlled locking and unlocking of the developer accommodating unit based on developer levels, using a solenoid to move the restriction member between locked and unlocked positions, and a link member to transmit driving force, while the restraint part prevents unwanted movement across the driving direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the restriction member is directly connected to the solenoid plunger, then the locking mechanism is simple, but the mechanism is prone to unintended unlocking due to impacts
Solution Approach 1:
The link member serves as an intermediary between the solenoid plunger and the restriction member. It transmits the driving force from the solenoid to rotate the restriction member for locking/unlocking operations. The link member includes a restraint part that prevents unintended rotation due to impacts, while still allowing controlled rotation when the solenoid is activated. This intermediary structure enhances locking reliability without significantly increasing overall mechanism complexity.
2Power
If the link member is connected at the center position, then the structure is simple, but the driving force transmission is less efficient
Solution Approach 1:
The link member is connected to the restriction member at a position offset from the center (rotation axis). This asymmetric connection position creates a longer moment arm, increasing the torque applied to the restriction member when the solenoid activates. The offset connection position is specifically designed to optimize the mechanical advantage and driving force transmission efficiency, making the locking mechanism more responsive and reliable.
3Reliability
If the restraint part is not provided, then the mechanism has fewer parts, but the link member may move in unwanted directions causing malfunction
Solution Approach 1:
The restraint part is integrated into the link member as a built-in structural feature rather than a separate component. It functions as a mechanical guide that constrains the link member's movement to the intended rotational path while allowing the necessary degrees of freedom for locking/unlocking operations. This integrated approach provides operational stability without significantly increasing the number of discrete parts.
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 wasteful exchange of developers by ensuring the locking cover is only unlocked when the developer level is below a threshold, while also preventing unintended unlocking due to impacts, thus enhancing the security and efficiency of developer management within the image forming apparatus.
Implementation Method 1
a solenoid, which is provided inside the cover member from the restriction member and is driven according to electric conduction to move the restriction member to the second position
Data Source
AI summary
An image forming apparatus includes a restriction member that is rotatable between a first position, in which opening of a locking cover is restrictable in engagement with the locking cover, and a second position in which engagement with the locking cover is disengaged, a coil spring that urges the restriction member to the first position, a solenoid that is driven according to electric conduction to move the restriction member to the second position, a link member that transmits driving force generated in the solenoid to the restriction member, and a restraint part that restrains movement of the link member in a direction crossing a driving direction.