Conveyance Access Cover Locking Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conveyance devices in image forming systems face challenges in securely locking the access cover during sheet conveyance, preventing accidental opening and ensuring safe maintenance access without relying on costly sensors and electric safety devices.
Innovation Solution
A locking mechanism that locks the access cover during conveyance and unlocks it when the conveyance unit moves to a maintenance position, using a cooperating lever, locking shaft, and biasing member to ensure secure locking and manual unlockability, preventing incorrect handling and ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is used to secure the access cover during conveyance, then the safety and reliability of operation is improved, but the device complexity increases due to additional mechanical components
Solution Approach 1:
The locking mechanism merges multiple functions into a single integrated assembly. The locking shaft, cooperating lever, and biasing member work together as one unit to provide both locking and unlocking functions. The locking shaft itself serves dual purposes: it acts as the locking element that engages with the locking groove, and simultaneously serves as the operating element that can be manually moved to unlock the cover.
Solution Approach 2:
The locking mechanism is designed to be self-actuating through the biasing member (spring) that automatically returns the locking shaft to the locked position after manual unlocking. The biasing member provides the restoring force that re-engages the locking shaft with the locking groove without requiring additional actuators or power sources, making the system self-service in maintaining the locked state.
2Reliability
If the access cover is locked during conveyance to prevent accidental opening, then the safety is improved, but the ease of operation deteriorates because manual unlocking is required
Solution Approach 1:
The locking shaft serves as an intermediary element between the locked and unlocked states. It physically bridges the gap between the locking groove (locked state) and the disengaged position (unlocked state). The manual operating member connects to the locking shaft, allowing operators to indirectly manipulate the locking state through this intermediary component, making the unlocking process easier and more intuitive.
Solution Approach 2:
The locking mechanism transitions from a static locked state to a dynamic unlocking process. The locking shaft is designed to be movable along its axis, allowing it to dynamically shift between engaged and disengaged positions. The biasing member provides dynamic restoring force that actively pushes the locking shaft back into the locking groove after manual displacement, creating a dynamic system that responds to operator input while maintaining safety.
3Ease of operation
If a manual lever system is used for unlocking, then the ease of operation is improved, but the reliability deteriorates due to potential for incorrect handling
Solution Approach 1:
The locking shaft and locking groove are designed with asymmetric geometries that allow movement in only one direction (unlocking) while preventing reverse movement (incorrect locking attempts). The locking groove has a specific shape that accommodates the locking shaft in the locked position but prevents the shaft from being forced back into engagement through improper manipulation. This asymmetric design ensures that only the correct unlocking sequence works.
Solution Approach 2:
The biasing member (spring) applies a preliminary counteracting force that opposes any incorrect handling attempts. When someone tries to force the locking shaft in the wrong direction or manner, the biasing member immediately pushes back against the applied force, preventing the incorrect action from completing. This preliminary anti-action through spring force protects against misuse before damage can occur.
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
The solution ensures the access cover remains locked during conveyance, allowing for safe operation and easy manual unlocking, preventing accidental movement of the conveyance unit and enhancing operator safety without the need for additional safety devices.
Implementation Method 1
a biasing member biasing the cooperating lever, with the lever supporting shaft as a fulcrum, toward engagement of the locking shaft in the locking groove of the access cover
Data Source
AI summary
A conveyance device includes a locking mechanism for an access cover. The locking mechanism includes a cooperating lever and a locking shaft attached to the cooperating lever. The locking shaft is slidable in an axial direction thereof between a locking position where the locking shaft engages in a locking groove of the access cover and a second unlocking position located lateral o the locking groove. When in the second unlocking position, the locking shaft engages with an engaged portion provided at part of a housing or at a fixed frame attached to the housing to constrain the cooperating lever against downward movement of a distal end of the cooperating lever. The locking mechanism further includes an operating member coupled to the locking shaft and including a holding portion capable of being held from outside the housing.