Sheet Feed Cassette Locking Mechanism with Integrated Power Switch
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Solution Overview
Problem
Existing image forming apparatuses lack an efficient mechanism to ensure the sheet feed cassette is securely locked and power management integrated with the locking mechanism, leading to potential theft and unintended ejection issues.
Innovation Solution
The apparatus incorporates a cylinder lock system with an inner and outer cylinder, a turning unit, switch switching part, and cassette locking part, allowing the sheet feed cassette to be locked and unlocked while managing power states, ensuring the cassette is locked when power is turned off and preventing accidental ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate locking mechanism is added to secure the sheet feed cassette, then security against theft and unintended ejection is improved, but device complexity increases
Solution Approach 1:
The patent combines the locking mechanism with the power switch assembly, merging two previously separate functions (locking and power control) into a single integrated unit. The locking lever is positioned within the power switch assembly housing, and the cam mechanism is integrated into the same structural space, thereby securing the cassette while avoiding the need for a completely separate locking system.
Solution Approach 2:
The power switch assembly serves multiple functions: it controls power supply to the image forming apparatus and simultaneously operates the locking mechanism. The cam mechanism within the power switch assembly interacts with both the locking lever and the power switch, enabling a single component system to perform both power control and security locking functions.
2Device complexity
If the locking mechanism is integrated into the power switch assembly, then device complexity is reduced, but the space required for the cam mechanism and locking lever increases
Solution Approach 1:
The locking lever is nested within the power switch assembly housing, positioned in the space between the power switch and the cassette support. The cam mechanism is nested within the same housing, utilizing the available internal space efficiently. This nesting arrangement allows the locking components to be accommodated within the existing power switch assembly volume without requiring a completely separate external locking mechanism.
Data Source
AI summary
An image forming apparatus includes a sheet feed cassette. The sheet feed cassette has a cylinder lock having a cylinder, and a turning unit coupled to the cylinder to be rotatable integrally with the cylinder. A switch switching part of the turning unit is configured to switch a power switch such that the power switch is in an ON state when an inner cylinder of the cylinder lock is at an unlocked position, and the power switch is in an OFF state when the inner cylinder is at a locked position. A cassette locking part of the turning unit is configured to place a sheet feed cassette of a standard sheet feeder in an unlocked state when the inner cylinder of the cylinder lock is at the unlocked position and place the sheet feed cassette in a locked state when the inner cylinder is at the locked position.