Sheet Feeding Device Locking Mechanism for Tray Security
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Solution Overview
Problem
Existing sheet feeding devices in image forming apparatuses lack a secure and user-friendly mechanism for attaching and detaching trays, which can lead to unauthorized access to sheets and inefficient operation.
Innovation Solution
A sheet feeding device with a container having a frame, an auxiliary frame member that can slide relative to the frame, a front cover, and a locking unit that prevents detachment when locked, allowing for secure attachment and easy detachment when unlocked, utilizing a relay member and lock mechanism to ensure trays are securely positioned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking unit is added to prevent tray detachment, then security against unauthorized access is improved, but device complexity increases
Solution Approach 1:
The locking unit is segmented into separate functional components: a locking member with locking protrusions, a locking hole, and a relay member. This segmentation allows each component to perform its specific function independently while maintaining overall system security, resolving the contradiction by providing robust locking without requiring a monolithic complex structure.
Solution Approach 2:
The locking mechanism employs a nested structure where the locking protrusion fits within the locking hole, and the relay member is positioned within the tray body to mediate between the locking member and the tray. This nesting approach provides secure locking functionality while keeping individual components simple and manageable.
2Reliability
If a locking mechanism is implemented to secure trays, then protection of sheets is improved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is designed to be self-actuating through the sliding motion of the tray. When the tray is inserted, the locking protrusion automatically engages with the locking hole without requiring additional locking actions from the user. Similarly, sliding the tray out automatically disengages the lock, providing protection while maintaining ease of operation.
Solution Approach 2:
The locking protrusion and locking hole are pre-positioned on the locking member and tray body respectively, so that the locking action occurs automatically as part of the tray insertion process. This preliminary positioning eliminates the need for separate locking steps, ensuring both protection and operational simplicity.
3Adaptability or versatility
If the auxiliary frame member is made slidable for adjustment, then adaptability is improved, but stability of the container structure deteriorates
Solution Approach 1:
The auxiliary frame member is designed to be slidable rather than fixed, allowing it to move dynamically to accommodate different tray sizes and configurations. This dynamic capability provides adaptability while the engagement features between the auxiliary frame member and the main frame ensure structural stability is maintained during operation.
Solution Approach 2:
The slidable auxiliary frame member includes engagement features that provide prior stabilization when the tray is inserted. The member slides into position and then engages with the main frame structure, providing beforehand cushioning that ensures structural stability is achieved automatically as part of the attachment process.
Data Source
AI summary
A sheet feeding device includes a container including a frame, an auxiliary frame member provided on the frame so as to be slidable relative to the frame, and a front cover that covers a front side of the auxiliary frame member, the container being detachably supported in a body of the sheet feeding device; a cover member that covers a top side of the container when the container is attached to the body; and a locking unit that prevents the container attached to the body from being detached from the body when the container is locked and that enables the container to be detached from the body when the container is not locked.